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Texas Instruments DAC8775EVM User guides
User's Guide
SBAU248 – November 2016
DAC8775EVM User’s Guide
This user’s guide describes the characteristics and use of the DAC8775 evaluation board (EVM). It also
discusses how to setup and configure the software and hardware for proper operation. Throughout this
document, the terms DAC8775EVM, evaluation board, evaluation module, and EVM are synonymous with
the DAC8775EVM.
1
2
3
4
5
Contents
Overview ...................................................................................................................... 2
EVM Hardware Overview ................................................................................................... 3
EVM Software Setup ....................................................................................................... 10
EVM Software Overview .................................................................................................. 12
EVM Documentation ....................................................................................................... 15
List of Figures
1
DAC8775EVM Hardware Setup ........................................................................................... 3
2
DAC8775EVM Block Diagram ............................................................................................. 3
3
PVDD/AVDD, AVSS, and DVDD Supply Connections ................................................................. 6
4
Digital Communication Test Points ........................................................................................ 7
5
Onboard Reference Supply Connections................................................................................. 8
6
Output Terminal Block Connections and Load Jumpers ............................................................... 9
7
SM-USB-DIG Connection................................................................................................... 9
8
DAC8775EVM Installer .................................................................................................... 10
9
DAC8775EVM Install Path ................................................................................................ 11
10
DAC8775EVM Software License Agreements ......................................................................... 11
11
EVM GUI – Front Panel ................................................................................................... 12
12
Device Schematic .......................................................................................................... 15
13
DC-DC Schematic.......................................................................................................... 16
14
Outputs Schematic ......................................................................................................... 16
15
DAC8775EVM PCB Components Layout ............................................................................... 17
List of Tables
1
Contents of DAC8775EVM Kit ............................................................................................. 2
2
Related Documentation ..................................................................................................... 2
3
EVM Jumper Summary ..................................................................................................... 4
4
SM-USB-DIG Connector .................................................................................................. 10
5
EVM Board Bill of Materials ............................................................................................... 18
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1
Overview
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Trademarks
Windows XP, Windows 7 are registered trademarks of Microsoft.
1
Overview
The DAC8775 is a four-channel (quad) 16-bit precision digital-to-analog converter (DAC). Each output can
be configured to produce a current in output ranges of 0 to 20 mA, 0 to 24 mA, 3.5 to 23.5 mA, or ±24 mA.
Each channel can also be configured for voltage output in ranges of 0 to 5 V, 0 to 6 V, 0 to 10 V, 0 to 12
V, ±5 V, ±6 V, ±10 V, or ±12 V. The DAC8775 includes integrated buck-boost converters for each channel
to generate all necessary power supplies from a single external supply. The buck-boost converter features
various operating modes that can be used to enhance power dissipation and thermal performance. The
DAC8775 features additional peripherals including: HART input pins for coupling of FSK HART Voltage
signals, slew-rate control for the analog outputs, and reliability features such as CRC, watchdog timer, and
conditional alarms.
1.1
EVM Kit Contents
Table 1 details the contents of the EVM kit. Contact the nearest Texas Instruments Product Information
Center or visit the Texas Instruments E2E Community (http://E2E.ti.com) if any component is missing.
Table 1. Contents of DAC8775EVM Kit
ITEM NO
1.2
ITEM
QTY
DESCRIPTION OR USE
1
DAC8775EVM PCB
1
EVM hardware
2
USB Extension Cable
1
Connects PC USB port to SM-USB-DIG USB connector
3
SM-USB-DIG Platform
1
Platform used for digital communication from PC to EVM
Related Documentation From Texas Instruments
The following documents provide information regarding Texas Instruments integrated circuits used in the
assembly of the DAC8775EVM. This user’s guide is available from the TI website under the literature
number SBAU248. Any letter appended to the literature number corresponds to the document revision that
is current at the time of the writing of this document. Newer revisions may be available from the TI website
at http://www.ti.com/, or by calling the Texas Instruments Literature Response Center at 1-800-477-8924
or the Product Information Center at 1-972-644-5580. When ordering identify the document by both title
and literature number.
Table 2. Related Documentation
ITEM NO
LITERATURE NUMBER
DAC8775 product data sheet
2
SLVSBY7
REF5050 product data sheet
SBOS410
SM-USB-DIG platform user’s guide
SBOU098
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EVM Hardware Overview
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2
EVM Hardware Overview
This section discusses the overall system setup for the EVM. A personal computer (PC) runs the software
that communicates with the SM-USB-DIG platform, which provides the power and digital signals used to
communicate with the EVM board. Connectors on the EVM board allow the user to connect the required
external power supplies for the configuration under test. The SM-USB-DIG must be connected to the
DAC8775EVM with the Texas Instruments logo facing up.
Power Supply
Single-supply for use with buck-boost converter
Multi-supply for use without buck-boost converter
Computer
USB
SM-USB-DIG
Platform
10-Pin Connector
DAC8775EVM
Figure 1. DAC8775EVM Hardware Setup
2.1
EVM Board Block Diagram
A block diagram of the EVM board setup is shown in Figure 2. This board provides test points for the SPI,
power, reference, ground, analog outputs, !LDAC, CLR, ALARM, and RESET signals. The EVM allows the
user to select the internal buck-boost converter or external power supplies as sources for each channel’s
positive and negative supplies rails. The EVM also allows the user to select the internal reference,
onboard REF5050 reference, or external reference to provide the reference voltage to the DAC8775.
PVDD/AVDD
Power Supply
Internal Buck-Boost
External Supplies
VOUTA
IOUTA
DAC8775
...
SPI
...
SM-USB-DIG
VOUTD
IOUTD
VREF
IEC61000-4 Protection Circuit
Placeholder
VPOSX/VNEGX
Internal VREF
REF5050
External VREF
HARTINX
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Figure 2. DAC8775EVM Block Diagram
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Electrostatic Discharge Warning
Many of the components on the EVM are susceptible to damage by electrostatic discharge (ESD). Users
are advised to observe proper ESD handling precautions when unpacking and handling the EVM,
including the use of a grounded wrist strap at an approved ESD workstation.
2.3
Jumper Summary
Table 3 summarizes all of the EVM jumper functionality.
Table 3. EVM Jumper Summary
JUMPER LABEL
JP1
1-2
JP2
1-2
JP3
1-2
JP4
1-2
JP5
1-2
JP6
1-2
JP7
1-2
JP8
1-2
JP9
Not installed
JP10
1-2
JP11
Not installed
JP12
2-3
JP13
Not installed
JP14
Not installed
JP15
Installed
JP16
4
DEFAULT
Installed
JP17
Installed
JP18
Not installed
JP19
Installed
JP20
Not installed
POSITION
FUNCTION
1-2
Selects DC/DC Channel A to supply VPOSA
2-3
Selects PVDD/AVDD to supply VPOSA
1-2
Selects DC/DC Channel A to supply VNEGA
2-3
Selects AVSS to supply VNEGA
1-2
Selects DC/DC Channel B to supply VPOSB
2-3
Selects PVDD/AVDD to supply VPOSB
1-2
Selects DC/DC Channel B to supply VNEGB
2-3
Selects AVSS to supply VNEGB
1-2
Selects DC/DC Channel C to supply VPOSC
2-3
Selects PVDD/AVDD to supply VPOSC
1-2
Selects DC/DC Channel C to supply VNEGC
2-3
Selects AVSS to supply VNEGC
1-2
Selects DC/DC Channel D to supply VPOSD
2-3
Selects PVDD/AVDD to supply VPOSD
1-2
Selects DC/DC Channel D to supply VNEGD
2-3
Selects AVSS to supply VNEGD
Installed
Not installed
Connects the SM-USB-DIG supply to DVDD
Disconnects the SM-USB-DIG supply from DVDD
1-2
Selects the DAC8775 internal reference
2-3
Selects the REF5050 external reference
Installed
Disables internal DVDD LDO
Not installed
Enables internal DVDD LDO
1-2
Issues a clear command to the DAC8775
2-3
No operation
Installed
Not installed
Installed
Not installed
Selects the external DVDD
Disconnects the external DVDD
Issues a hardware reset to the DAC8775
No operation
Installed
Select asynchronous update mode
Not installed
Select synchronous update mode
Installed
VSENSEPA is shorted to VOUTA on-board
Not installed
VSENSEPA is shorted to VOUTA off-board
Installed
VSENSEPB is shorted to VOUTB onboard
Not installed
VSENSEPB is shorted to VOUTB off-board
Installed
Loads VOUTA/IOUTA with a short to GND
Not installed
Unloads VOUTA/IOUTA of the short to GND
Installed
Loads VOUTA/IOUTA with a 250-Ω resistor
Not installed
Installed
Not installed
Unloads VOUTA/IOUTA of the 250-Ω resistor
Loads VOUTA/IOUTA with a 625-Ω resistor
Unloads VOUTA/IOUTA of the 625-Ω resistor
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Table 3. EVM Jumper Summary (continued)
JUMPER LABEL
JP21
JP22
JP23
DEFAULT
Not installed
Not installed
Not installed
JP24
Not installed
JP25
Not installed
JP26
JP27
JP28
Installed
Installed
Installed
JP29
Installed
JP30
Installed
JP31
JP32
JP33
Installed
Not installed
Not installed
JP34
Not installed
JP35
Not installed
JP36
JP37
JP38
Not installed
Not installed
Not installed
JP39
Not installed
JP40
Installed
JP41
JP42
JP43
Installed
Installed
Installed
POSITION
FUNCTION
Installed
Loads VOUTA/IOUTA with a 1-kΩ resistor
Not installed
Unloads VOUTA/IOUTA the 1-kΩ resistor
Installed
Loads VOUTB/IOUTB with a short to GND
Not installed
Unloads VOUTB/IOUTB of the short to GND
Installed
Loads VOUTB/IOUTB with a 250-Ω resistor
Not installed
Installed
Not installed
Unloads VOUTB/IOUTB of the 250-Ω resistor
Loads VOUTB/IOUTB with a 625-Ω resistor
Unloads VOUTB/IOUTB of the 625-Ω resistor
Installed
Loads VOUTB/IOUTB with a 1-kΩ resistor
Not installed
Unloads VOUTB/IOUTB the 1-kΩ resistor
Installed
VSENSENA is shorted to GND onboard
Not installed
VSENSENA is shorted to GND off-board
Installed
VSENSENB is shorted to GND onboard
Not installed
VSENSENB is shorted to GND off-board
Installed
When HARTIN_A is not in use, AC couple to GND
Not installed
When HARTIN_A is in use, disconnect from GND
Installed
When HARTIN_B is not in use, AC couple to GND
Not installed
When HARTIN_B is in use, disconnect from GND
Installed
VSENSEPC is shorted to VOUTA onboard
Not installed
VSENSEPC is shorted to VOUTA off-board
Installed
VSENSEPD is shorted to VOUTB onboard
Not installed
VSENSEPD is shorted to VOUTB off-board
Installed
Loads VOUTC/IOUTC with a short to GND
Not installed
Unloads VOUTC/IOUTC of the short to GND
Installed
Loads VOUTC/IOUTC with a 250-Ω resistor
Not installed
Installed
Not installed
Unloads VOUTC/IOUTC of the 250-Ω resistor
Loads VOUTC/IOUTC with a 625-Ω resistor
Unloads VOUTC/IOUTC of the 625-Ω resistor
Installed
Loads VOUTC/IOUTC with a 1-kΩ resistor
Not installed
Unloads VOUTC/IOUTC the 1-kΩ resistor
Installed
Loads VOUTD/IOUTD with a short to GND
Not installed
Unloads VOUTD/IOUTD of the short to GND
Installed
Loads VOUTD/IOUTD with a 250-Ω resistor
Not installed
Installed
Not installed
Unloads VOUTD/IOUTD of the 250-Ω resistor
Loads VOUTD/IOUTD with a 625-Ω resistor
Unloads VOUTD/IOUTD of the 625-Ω resistor
Installed
Loads VOUTD/IOUTD with a 1-kΩ resistor
Not installed
Unloads VOUTD/IOUTD the 1-kΩ resistor
Installed
VSENSENC is shorted to GND onboard
Not installed
VSENSENC is shorted to GND off-board
Installed
VSENSEND is shorted to GND onboard
Not installed
VSENSEND is shorted to GND off-board
Installed
When HARTIN_C is not in use, AC couple to GND
Not installed
When HARTIN_C is in use, disconnect from GND
Installed
When HARTIN_D is not in use, AC couple to GND
Not installed
When HARTIN_D is in use, disconnect from GND
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Powering the EVM
This section describes the various power configurations that can be used by the EVM.
2.4.1
PVDD_X/AVDD Supply
The PVDD_X, the buck-boost converter supplies, and AVDD, the analog supply, of the DAC8775 are
connected to the same power net labeled PVDD/AVDD on the DAC8775EVM. Terminal block J2, shown
in Figure 3, allows for external voltage sources to be connected to the PVDD/AVDD supply. The
PVDD/AVDD supply must be provided regardless of whether the buck-boost converter is in use or not.
PVDD/AVDD
GND
AVSS
GND
GND
DVDD
Figure 3. PVDD/AVDD, AVSS, and DVDD Supply Connections
2.4.2
VPOS_X and VNEG_X Supplies
VPOS_X, the positive supply for the output signal chain, and VNEG_X, the negative supply for the output
signal chain, may be powered by the DAC8775 internal buck-boost converters or by off-board supply
voltages.
WARNING
Permanent device damage may occur if externally supplying
VPOS_X or VNEG_X while the internal buck-boost supply is
enabled.
When using the DAC8775 internal buck-boost converters to supply VPOS_X and VNEG_X, install JP1
through JP8 (or the two jumpers that correspond to the channel of interest) in the 1-2 position, or "inside"
position, as indicated by Table 3.
When using external equipment to supply VPOS_X and VNEG_X, install JP1 through JP8 (or the two
jumpers that correspond to the channel of interest) in the 2-3 position, or "outside" position, as indicated
by Table 3. In this configuration, the VPOS_X supplies are connected to the PVDD/AVDD net and the
VNEG_X supplies are connected to the AVSS net. If bipolar supplies are used, connect an appropriate
negative supply voltage to AVSS through terminal block J3, as shown in Figure 3. If unipolar supplies are
used, connect AVSS to ground through terminal block J3.
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2.4.3
DVDD Supply
DVDD, the digital supply voltage, of the DAC8775 can be supplied by the SM-USB-DIG VDUT supply (pin
6 of J1), an external supply voltage through J4 (illustrated in Figure 3), or by the DAC8775 internal DVDD
LDO. When using the SM-USB-DIG as the DVDD supply, uninstall jumper JP13 and install jumpers JP9
and JP11. To use an external supply voltage as the DVDD supply, install jumpers JP13 and JP11 and
uninstall JP9. To use the DAC8775 internal LDO as the DVDD supply, uninstall jumpers JP9, JP13, and
JP11.
In each DVDD supply configuration, take care to ensure that digital logic thresholds of the host and
DAC8775 match and that the absolute maximum ratings of the DAC8775 are not violated.
2.5
EVM Features
This section describes some of the hardware features present on the EVM board.
2.5.1
Communication Test Points
The EVM board features test points for monitoring the communication between the SM-USB-DIG and the
DAC8775. Test points are provided for the !LDAC, CLR, ALARM, RESET, SDIN, SCLK, !SYNC, and SDO
pins of the DAC8775.
Figure 4. Digital Communication Test Points
The EVM design also allows external signals to be connected through these communication test points if
the EVM is integrated into a custom evaluation setup or application specific prototype. Note that if the SMUSB-DIG platform is not used, DVDD must be configured to use the DAC8775 internal DVDD LDO or
external supplies as described in Section 2.4.3.
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Reference Voltage
The DAC8775 reference voltage can be supplied by the internal voltage reference, by the onboard
REF5050, or by an external reference voltage.
V
+5
D
N
G
Figure 5. Onboard Reference Supply Connections
To use the internal reference voltage, place JP10 in the 1-2 position. To use the REF5050 reference
voltage, place JP10 in the 2-3 position and connect a supply voltage for the REF5050 to J9, as shown in
Figure 5. To use an external reference voltage, remove JP10 and the reference can be connected to the
DAC8775EVM through the center post of JP10.
2.5.3
VOUT_X, VSENSEP_X, and VSENSEN_X
The VOUT_X pins can be access on terminal blocks J5, J6, J7, and J8 or by the OUT_A, OUT_B,
OUT_C, or OUT_D test points. The VSENSEP_X and VSENSEN_X sense connections may be provided
onboard or externally closer to the point of load through terminal blocks J5, J6, J7, or J8. To provide the
VSENSEP_X connections onboard, install JP16, JP17, JP30, or JP31 based on the channel of interest.
Similarly, to provide VSENSEN_X connections onboard, install JP26, JP27, JP40, or JP41. Removing
these jumpers requires that the sense connections are made external to the EVM board. Figure 6 shows
the arrangement of the output terminal blocks.
2.5.4
IOUT_X
The IOUT_X pins can be accessed on terminal blocks J5, J6, J7, or J8 or by the test points OUT_A,
OUT_B, OUT_C, or OUT_D.
2.5.5
Onboard Output Loads
Four load choices are installed on the EVM board to evaluate the voltage and current outputs as well as
the adaptive power management performance of the DAC8775. JP18, JP22, JP32, or JP36 are available
to provide a short-circuit condition on the outputs. JP19, JP23, JP33, or JP37 provide a 250-Ω load on the
outputs. JP20, JP24, JP34, or JP38 are available to provide a 625-Ω on the outputs. JP21, JP25, JP35, or
JP39 provides a 1-kΩ load on the outputs.
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Load
Jumpers
G
VSE ND
N
V
VSE OUT/IO SEN_A
U
NSE
P_A T_A
G
VSE ND
N
V
VSE OUT/IO SEN_B
U
NSE
P_B T_B
G
VSE ND
N
V
VSE OUT/IO SEN_C
U
NSE
P_C T_C
GND
V
VOU SENSEN
VSE
T
NSE /IOUT_D _D
P_D
Figure 6. Output Terminal Block Connections and Load Jumpers
2.5.6
Applying HART Signals
JP28, JP29, JP42, and JP43 are available to couple external HART FSK communication signals onto the
current outputs. When injecting the HART signal, remove JP28, JP29, JP42, or JP43 and apply the HART
signal to pin 1. When a HART signal is not being injected, install JP28, JP29, JP42, or JP43, with AC
coupling the HART pins to ground.
2.6
Connecting the SM-USB-DIG
To connect the EVM board and the SM-USB-DIG platform together, firmly slide the male and female ends
of the 10-pin connectors together with the Texas Instruments logo of the SM-USB-DIG facing up as shown
in Figure 7. Make sure that the two connectors are completely pushed together as loose connections may
cause intermittent operation.
Figure 7. SM-USB-DIG Connection
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Signal Definitions of J1 (10-Pin SM-USB-DIG Connector)
Table 4 shows the pin-out for the 10-pin connector used to communicate between the EVM and the SMUSB-DIG. Note that the I2C communication lines (I2C_SCL and I2C_SDA1) are not used.
Table 4. SM-USB-DIG Connector
3
PIN ON J1
SIGNAL
1
I2C_SCL
2
CTRL/MEAS4
3
I2C_SDA1
4
CTRL/MEAS5
5
SPI_DOUT1
6
VDUT
7
SPI_CLK
8
GND
DESCRIPTION
I2C clock signal (SCL)
GPIO: Control output or measure input
I2C data signal (SDA)
GPIO: Control output or measure input
SPI data output (MOSI)
Switchable DUT power supply: 3.3 V, 5 V, Hi-Z (disconnected).
Note: When VDUT is Hi-Z, all digital I/Os are Hi-Z as well
SPI clock signal (SCLK)
Power return (GND)
9
SPI_CS1
SPI chip-select signal (!CS)
10
SPI_DIN1
SPI data input (MISO)
EVM Software Setup
This section discusses how to install the EVM software.
3.1
Operating Systems for EVM Software
The EVM software has been tested on the Windows XP® and Windows 7® operating systems with United
States and European regional settings. The software should also function on other Windows operating
systems.
3.2
EVM Software Installation
The EVM software may be downloaded by following the instructions provided external to this document.
To install the software, locate and extract the file named DAC8775.zip to a specific folder (for example,
C:\DAC8775\) on the hard drive.
Figure 8. DAC8775EVM Installer
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After the files are extracted, navigate to the folder created on the hard drive. Locate and execute the
setup.exe file to start the installation. The DAC8775 software installer file then opens to begin the
installation process.
After the installation process initializes, the user is given a choice of selecting the installation directory,
usually defaulting to C:\Program Files(x86)\DAC8775EVM\ and C:\Program Files(x86)\National
Instruments\.
Figure 9. DAC8775EVM Install Path
After selecting the installation directory, two license agreements are presented that must be accepted.
Figure 10. DAC8775EVM Software License Agreements
After accepting the Texas Instruments and National Instruments license agreements, the progress bar
opens and shows the installation of the software. Once the installation process is completed, click Finish.
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EVM Software Overview
This section describes the use of the EVM software. Figure 11 shows the front panel of the EVM GUI.
Figure 11. EVM GUI – Front Panel
4.1
Starting the EVM Software
The EVM software can be operated through the Windows start menu. From the start menu, select All
Programs, and then select DAC8775EVM.
An error will appear if the PC cannot communicate with the EVM. If this error happens, first ensure that
the USB cable is properly connected on both ends. This error can also occur if the USB cable is
connected before the SM-USB-DIG platform power source. Another possible source for this error is a
problem with the USB human interface driver on the PC. Make sure the device is recognized when the
USB cable is plugged in, as indicated by a Windows-generated confirmation sound.
4.2
Reading From and Writing to Registers
The EVM software automatically reads from the DAC8775 when a reset or clear command is issued. To
read from the device in other situations, press the READ ALL button on the EVM GUI. Write actions are
carried out automatically when the value of any element on the GUI is changed.
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4.3
Device Controls
This section describes the GUI controls for the internal reference, power-on conditions, clear, software
reset, and DAC broadcast functionality.
4.3.1
Internal Reference
The internal reference can be enabled or disabled using the internal reference control on the EVM GUI. By
default, the internal reference is disabled.
4.3.2
Power-On Condition
By default the power-on state of the current output is Hi-Z and the voltage output is 30 kΩ to ground after
a clear or reset command. The power-on condition GUI control allows control of the voltage output poweron condition as either 30 kΩ to ground or Hi-Z.
4.3.3
Software Reset
The RESET button on the GUI issues a software reset to the DAC8775, restoring the default power-on
register contents. The GUI immediately reads all of the registers of the device to synchronize the GUI and
hardware. A hardware reset can be issued through JP14. If a hardware issue is issued the READ ALL
button should be pressed to synchronize the GUI and hardware.
4.3.4
Software Clear
The CLEAR button on the GUI issues a clear command to the DAC8775, restoring the DAC data registers
to full-scale or zero-scale based on each channel’s clear select settings and clear enable settings. After a
clear command is issued the GUI immediately reads the data registers of the device to synchronize the
GUI and hardware. A hardware clear command can be issued through JP12. If a hardware clear is issued
the READ ALL button should be pressed to synchronize the GUI and hardware.
4.4
4.4.1
DAC Controls
DAC Outputs
The DACs can be configured for voltage or current outputs of various spans through the Output Mode
control on the GUI. The DAC output can be set to active or inactive by checking or removing the check
from the Output Enable Boolean control on the GUI. Once an output range is selected and the output is
enabled, the DAC output value can be controlled by writing values to the DAC Data control. The DAC
Data control expects hexadecimal input formats. The small indicator on the left side of the DAC Data
control can be used to change the input data format.
Output current drive can be programmatically limited for each of the voltage output modes through the
VOUT Current Limit control on the GUI. Take note that the actual current limit will be compliant to the values
specified in the DAC8775 electrical characteristics table.
4.4.2
Clear Functionality
Each DAC output has a Clear Enable Boolean that is AND’d with the CLEAR command. If the Clear
Enable Boolean is checked, the output channel will respond to a clear event; conversely, if the Boolean is
unchecked, the output channel will not respond to a clear event. Each DAC can be programmed to clear
to either zero-scale or full-scale. This behavior can be controlled by the Clear Select control on the GUI.
4.4.3
HART Inputs
The enable HART signals to be coupled to the current outputs through the onboard coupling path the
HART-Enable Boolean control must be checked.
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EVM Software Overview
4.5
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DAC Calibration Controls
Each DAC may use digital calibration to reduce offset and gain errors at each channel’s output. By default
the calibration features are disabled. To enable the calibration features, the Calibration Enable Boolean
control must be checked. When the control is checked, offset and gain calibration may be controlled by
the values written to each channels Offset Calibration and Gain Calibration controls, respectively, on the
EVM GUI. For more information concerning the calibration features, please refer to the DAC8775
datasheet.
4.6
Slew-Rate Controls
The slew-rate of each channel may be controlled by the slew control registers for each channel. By default
the slew-rate control features are disabled. To enable the slew-rate control features the Slew-Rate Ctl
Enable Boolean control must be checked. When the control is checked, slew-rate step size and clock
registers may be used to control the output’s slew-rate through the Slew-Rate Ctl Step Size and SlewRate Ctl Clock respectively.
4.7
Buck-Boost Converter Controls
Each buck-boost converter can be configured through the EVM GUI. The Buck-Boost Mode control is
used to select the operating mode of the buck-boost converter and the Buck-Boost Enable control is used
to enable the positive, negative, or both arms of the buck-boost converter. When Buck-Boost Mode is set
to Clamp Mode, the positive clamp and negative clamp controls are used to set each arm’s output clamp.
14
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EVM Documentation
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5
EVM Documentation
This section contains the complete bill of materials and schematic diagram for the DAC8775EVM.
Documentation information for the SDM-USB-DIG Platform can be found in the SDM-USB-DIG Platform
User’s Guide (SBOU136) available at www.TI.com.
5.1
EVM Board Schematic
Figure 12, Figure 13, and Figure 14 illustrate the DAC8775EVM board schematics.
J1
LDAC
1
2
3
4
5
6
7
8
9
10
CS
MOSI
MISO
SCLK
ALARM
RESET
CLR
PVDD/AVDD
SPI_MISO
SPI_CS
CLR
RESET
ALARM
JP9
DIG_DVDD
2
DVDD
PVDD_A
PVDD_B
PVDD_C
PVDD_D
JP10
EXT_VREF
3
1
2
REFOUT
J2
1
2
JP11
2
1
VREF_IN
C44
10µF
GND
REFIN
PVDD/AVDD
C43
0.1µF
GND
AVSS
GND
2
1
C45
10µF
AVSS
DVDD
1
GND
JP12
DVDD
JP13
J4
R9
10k
DVDD
1
1
2
2
2
CLR
ALARM
C47
200pF
3
C46
10µF
DVDD
VNEG_IN_A
VNEG_IN_A
LP_A
LN_A
VPOS_IN_A
VNEG_IN_C
VNEG_IN_C
LP_C
LN_C
VPOS_IN_C
DVDD
VNEG_IN_D
VNEG_IN_D
LP_D
LN_D
VPOS_IN_D
19
36
16
14
38
20
40
12
10
42
51
70
6
8
49
55
71
2
4
53
AVDD
DVDD
PVDD_A
PVDD_B
PVDD_C
PVDD_D
DVDD_EN
VNEG_IN_A
VNEG_IN_A
LP_A
LN_A
VPOS_IN_A
VNEG_IN_B
VNEG_IN_B
LP_B
LN_B
VPOS_IN_B
VNEG_IN_C
VNEG_IN_C
LP_C
LN_C
VPOS_IN_C
VNEG_IN_D
VNEG_IN_D
LP_D
LN_D
VPOS_IN_D
REFIN
REFOUT
IOUT_A
HARTIN_A
CCOMP_A
VOUT_A
VSENSEP_A
VSENSEN_A
46
47
37
29
30
39
33
34
IOUT_B
HARTIN_B
CCOMP_B
VOUT_B
VSENSEP_B
VSENSEN_B
41
27
28
43
31
32
IOUT_C
HARTIN_C
CCOMP_C
VOUT_C
VSENSEP_C
VSENSEN_C
50
64
63
48
60
59
IOUT_D
HARTIN_D
CCOMP_D
VOUT_D
VSENSEP_D
VSENSEN_D
54
62
61
52
58
57
PVSS_A
PVSS_B
PVSS_C
PVSS_D
AGND_A
AGND_B
AGND_C
AGND_D
AGND1
AGND2
AGND3
EP
15
11
7
3
18
9
72
69
56
35
45
73
REFIN
REFOUT
IOUT_A
HART_IN_A
CCOMP_A
VOUT_A
VSENSEP_A
VSENSEN_A
IOUT_B
HART_IN_B
CCOMP_B
VOUT_B
VSENSEP_B
VSENSEN_B
IOUT_C
HART_IN_C
CCOMP_C
VOUT_C
VSENSEP_C
VSENSEN_C
IOUT_D
HART_IN_D
CCOMP_D
VOUT_D
VSENSEP_D
VSENSEN_D
1
SPI_LDAC
44
66
17
13
5
1
65
VNEG_IN_B
VNEG_IN_B
LP_B
LN_B
VPOS_IN_B
AVSS
J3
GND
1
SUPER MINI DIG FEMALE
PVDD/AVDD
PVDD/AVDD
C42
1µF
U1
SPI_SCLK
SPI_MISO
ALARM
SPI_MOSI
GND
SPI_CS
SPI_SCLK
DIG_DVDD
SPI_MOSI
RESET
C41
0.1µF
SPI_LDAC
SPI_DIN
SPI_CS
GND
SPI_CLK
VDUT
SPI_DOUT
CTRL/MEAS5
I2C_SDA
CTRL/MEAS4
I2C_SCK
GND
GND
JP15
GND
GND
GND
GND
DVDD
2
GND
R10
10k
RESET
GND
GND
GND
GND
1
GND
SPI_SCLK
SPI_MOSI
SPI_MISO
SPI_CS
SPI_LDAC
CLR
RESET
ALARM
21
22
24
25
23
26
68
67
SCLK
SDIN
SDO
SYNC
LDAC
CLR
RESET
ALARM
JP14
GND
GND
GND
2
DAC8775RMP
PVSS_A
PVSS_B
PVSS_C
PVSS_D
AGND_A
AGND_B
AGND_C
AGND_D
GND
GND
GND
GND
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 12. Device Schematic
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C1
C2
C3
10µF
10µF
10µF
C4
GND
C6
0.1µF
R1
JP1
AVSS
2
PVDD/AVDD
1
VNEG_A
VNEG_A
C14
C20
C21
C22
C23
10µF
10µF
10µF
D9
JP5
AVSS
1
2
VNEG_IN_B
10µF
PVDD/AVDD
D10
AVSS
1
1
VNEG_D
VNEG_D
VPOS_D
GND
1µF
JP8
3
VPOS_D
PVDD/AVDD
C32
10.0
D12
JP7
3
C33
C28
0.1µF
R8
10.0
1µF
1
VNEG_C
VNEG_C
FB8
2k ohm
R7
GND
JP6
3
VPOS_C
VPOS_C
C31
GND
1µF
2
3
C24
FB7
2k ohm
C27
0.1µF
C30
10.0
D11
2
PVDD/AVDD
C26
0.1µF
R6
10.0
GND
GND
FB6
2k ohm
R5
1µF
GND
2
C29
GND
1µF
VNEG_IN_B
GND
LP_B
GND
LN_B
VPOS_IN_B
PVDD_B
GND
PVSS_B
GND
AGND_B
GND
1µF
D8
36V
GND
C34
PVDD/AVDD
L3
100µH
C35
L4
100µH
C36
1µF
C37
C38
1µF
C39
10µF
C40
10µF
GND
VNEG_IN_D
GND
1µF
VNEG_IN_D
GND
LP_D
GND
VPOS_IN_D
AGND_D
GND
PVDD_D
GND
D16
36V
LN_D
D15
36V
1µF
PVSS_D
GND
VNEG_IN_C
1µF
VNEG_IN_C
GND
LP_C
VPOS_IN_C
PVDD_C
PVSS_C
GND
D14
36V
LN_C
D13
36V
1µF
AGND_C
1
L2
100µH
D7
36V
1µF
VNEG_IN_A
GND
FB5
2k ohm
C25
0.1µF
GND
JP4
3
VNEG_B
VNEG_B
C19
10µF
1µF
VNEG_IN_A
GND
LP_A
GND
D6
36V
LN_A
D5
36V
VPOS_IN_A
PVDD_A
PVSS_A
AGND_A
AVSS
1
VPOS_B
C16
1µF
C18
1µF
GND
GND
1µF
PVDD/AVDD
L1
100µH
C17
10µF
GND
C12
10.0
D4
VPOS_B
PVDD/AVDD
C15
GND
D2
JP3
3
C13
C8
0.1µF
R4
10.0
1µF
JP2
3
VPOS_A
FB4
2k ohm
R3
GND
1µF
2
1
VPOS_A
2
3
C11
GND
10.0
D3
FB3
2k ohm
C7
0.1µF
C10
R2
D1
10.0
1µF
PVDD/AVDD
FB2
2k ohm
2
C9
GND
10µF
GND
FB1
2k ohm
C5
0.1µF
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 13. DC-DC Schematic
1
75V
BAV99-7-F
VPOS_A D17
VNEG_A
R11
2
JP17
1
2
VSENSEP_B
1
C51
1µF
C52
1µF
C49
CCOMP_B
C53
1µF
DNI
C54
0.1µF
15
JP18
D19
36V
JP19
JP20
GND
R14
OUT_B
FB10
R16
600 ohm
IOUT_B
JP21
C55
0.1µF
15
ED555/4DS
JP26
J6
JP22
D20
36V
JP23
1
2
3
4
JP24
JP25
ED555/4DS
JP27
GND
GND
1
2
GND
2
2
2
2
GND
C56
2
VSENSEN_B
GND
GND
C57
GND
GND
1
HART_IN_B
1
HART_IN_A
2
1
2
2
VSENSEN_A
GND
15
1
VOUT_B
1
2
3
4
1
1
J5
1
600 ohm
1
OUT_A
FB9
R15
1
GND
15
1
GND
R13
IOUT_A
R17
300
0.022µF
JP28
JP29
R20
324
R21
1.00k
R22
249
GND
R24
1.00k
75V
BAV99-7-F
VPOS_CD21
VNEG_C
R25
2
JP31
1
2
VSENSEP_D
1
VPOS_DD22
R26
C62
1µF
BAV99-7-F
75V
C59
CCOMP_D
DNI
GND
IOUT_C
C64
0.1µF
15
JP32
D23
36V
JP33
OUT_D
15
FB12
R30
600 ohm
IOUT_D
JP35
C65
0.1µF
15
ED555/4DS
JP40
J8
JP36
D24
36V
JP37
1
2
3
4
JP38
JP39
ED555/4DS
JP41
GND
1
2
GND
2
2
2
2
GND
GND
2
VSENSEN_D
GND
GND
C67
GND
GND
1
HART_IN_D
1
HART_IN_C
2
1
2
2
GND
VOUT_D
1
2
3
4
1
JP34
GND
R28
J7
1
600 ohm
1
FB11
R29
1
OUT_C
15
1
GND
R27
VOUT_C
C63
1µF
1
DNI
C66
1
3
C61
1µF
1
CCOMP_C
VSENSEN_C
VNEG_D
2
15
C60
1µF
C58
3
15
GND
1
1
GND
2
JP30
R23
324
2
GND
2
R18
300
0.022µF
2
R19
249
VSENSEP_C
1
1
DNI
VOUT_A
2
15
C50
1µF
C48
CCOMP_A
3
15
75V
BAV99-7-F
VPOS_B D18
VNEG_B
R12
2
2
3
JP16
VSENSEP_A
R31
300
0.022µF
JP42
R32
300
JP43
R35
1.00k
R36
249
R37
324
R38
1.00k
2
R34
324
2
R33
249
0.022µF
GND
GND
GND
J9
GND
U2
2
1
2
VREFSUPPLY
7
C68
10uF
C69
1µF
C70
0.1µF
8
1
VIN
VOUT
TRIM/NR
NC
DNC
DNC
6
EXT_VREF
R39
1.50
5
TEMP
3
GND
4
C71
1µF
C72
47µF
REF5050IDGK
GND
GND
GND
Copyright © 2016, Texas Instruments Incorporated
Figure 14. Outputs Schematic
16
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5.2
EVM PCB Components Layout
Figure 15 shows the layout of the components for the EVM board.
Figure 15. DAC8775EVM PCB Components Layout
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EVM Documentation
5.3
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EVM Board Bill of Materials
Table 5 lists the EVM board bill of materials.
Table 5. EVM Board Bill of Materials
QTY
18
DESIGNATOR
DESCRIPTION
PARTNUMBER
MANUFACTURER
1
!PCB1
Printed Circuit Board
PA005
Any
15
C1, C2, C3, C4, C15, C16, C21, C22,
C23, C24, C35, C36, C44, C45, C46
CAP, CERM, 10uF, 50V, +/10%, X7R, 1210 (H=2.5mm)
UMK325AB7106KM-T
Taiyo Yuden
15
C5, C6, C7, C8, C25, C26, C27, C28,
C41, C43, C54, C55, C64, C65, C70
CAP, CERM, 0.1uF, 50V, +/10%, X7R, 0603
GRM188R71H104KA93
D
MuRata
31
C9, C10, C11, C12, C13, C14, C17,
C18, C19, C20, C29, C30, C31, C32,
C33, C34, C37, C38, C39, C40, C42,
C50, C51, C52, C53, C60, C61, C62,
C63, C69, C71
CAP, CERM, 1uF, 50V, +/10%, X7R, 0603
UMK107AB7105KA-T
Taiyo Yuden
1
C47
CAP, CERM, 200pF, 50V, +/5%, C0G/NP0, 0603
GRM1885C1H201JA01
D
MuRata
4
C48, C49, C58, C59
DNI
4
C56, C57, C66, C67
CAP, CERM, 0.022uF, 50V,
+/-10%, X7R, 0603
C1608X7R1H223K
TDK
1
C68
CAP CER 10UF 50V 20%
X7R 1210
UMK325AB7106MM-T
Taiyo Yuden
1
C72
CAP, CERM, 47uF, 25V, +/20%, X5R, 1206
C3216X5R1E476M160A
TDK
C
8
D1, D2, D3, D4, D9, D10, D11, D12
Diode, Schottky, 60V, 1A,
SOD-123
MBRX160-TP
Micro Commercial
Components
12
D5, D6, D7, D8, D13, D14, D15, D16,
D19, D20, D23, D24
Diode, TVS, Bi, 36V, 400W,
SOD323, 2-Leads, Body
1.9x1.45mm, No Polarity
Mark
CDSOD323-T36SC
Bourns
4
D17, D18, D21, D22
Diode, Switching, 75V, 0.3A,
SOT-23
BAV99-7-F
Diodes Inc.
8
FB1, FB2, FB3, FB4, FB5, FB6, FB7,
FB8
Ferrite Bead, 2000 ohm @
100MHz, 1.2A, 1210
(H=2.5mm)
FB MH3225HM202NT
Taiyo Yuden
4
FB9, FB10, FB11, FB12
Ferrite Bead, 600 ohm @
100MHz, 3A, 1210
(H=2.5mm)
FBMH3225HM601NT
Taiyo Yuden
1
J1
Receptacle, 50mil 10x1, R/A,
TH
851-43-010-20-001000
Mill-Max
4
J2, J3, J4, J9
Terminal Block, 6A, 3.5mm
Pitch, 2-Pos, TH
ED555/2DS
On-Shore
Technology
4
J5, J6, J7, J8
Terminal Block, 6A, 3.5mm
Pitch, 4-Pos, TH
ED555/4DS
On-Shore
Technology
10
JP1, JP2, JP3, JP4, JP5, JP6, JP7,
JP8, JP10, JP12
Header, TH, 100mil, 3x1,
Gold plated, 230 mil above
insulator
TSW-103-07-G-S
Samtec, Inc.
33
JP9, JP11, JP13, JP14, JP15, JP16,
JP17, JP18, JP19, JP20, JP21, JP22,
Header, TH, 100mil, 2x1,
JP23, JP24, JP25, JP26, JP27, JP28,
Gold plated, 230 mil above
JP29, JP30, JP31, JP32, JP33, JP34,
insulator
JP35, JP36, JP37, JP38, JP39, JP40,
JP41, JP42, JP43
TSW-102-07-G-S
Samtec
4
L1, L2, L3, L4
Inductor, Shielded Drum
Core, Ferrite, 100uH, 0.52A,
0.77 ohm, SMD
74408943101
Wurth Elektronik
eiSos
8
R1, R2, R3, R4, R5, R6, R7, R8
RES, 10.0 ohm, 1%, 0.1W,
0603
CRCW060310R0FKEA
Vishay-Dale
2
R9, R10
RES, 10k ohm, 5%, 0.1W,
0603
CRCW060310K0JNEA
Vishay-Dale
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Table 5. EVM Board Bill of Materials (continued)
QTY
DESIGNATOR
12
R11, R12, R13, R14, R15, R16, R25,
R26, R27, R28, R29, R30
RES, 15 ohm, 5%, 0.1W,
0603
DESCRIPTION
CRCW060315R0JNEA
Vishay-Dale
4
R17, R18, R31, R32
RES, 300, 0.1%, 0.25 W,
1206
ERA-8AEB301V
Panasonic
4
R19, R22, R33, R36
RES, 249, 0.1%, 0.25 W,
1206
TNPW1206249RBEEA
Vishay-Dale
4
R20, R23, R34, R37
RES, 324, 0.1%, 0.25 W,
1206
ERA-8AEB3240V
Panasonic
4
R21, R24, R35, R38
RES, 1.00 k, 0.1%, 1 W, 1206
PHP01206E1001BST5
resistor
Vishay-Dale
1
R39
RES, 1.50 ohm, 1%, 0.1W,
0603
Vishay-Dale
16
TP1, TP2, TP3, TP4, TP5, TP6, TP7,
TP8, TP17, TP18, TP19, TP20, TP31, Test Point, Compact, Red, TH 5005
TP32, TP33, TP34
Keystone
8
TP9, TP10, TP11, TP12, TP13, TP14, Test Point, Compact, Yellow,
TP15, TP16
TH
5009
Keystone
10
TP21, TP22, TP23, TP24, TP25,
TP26, TP27, TP28, TP29, TP30
Test Point, Compact, Black,
TH
5006
Keystone
1
U1
Quad-Channel, 16-Bit
Programmable Current
Output and Voltage Output
Digital-to-Analog Converter
with Adaptive Power
Management, RMP0072A
DAC8775RMP
Texas Instruments
1
U2
Low-Noise, Very Low Drift,
Precision Voltage Reference,
DGK0008A
REF5050IDGK
Texas Instruments
1
U2
Low-Noise, Very Low Drift,
Precision Voltage Reference,
DGK0008A
REF5050IDGK
Texas Instruments
SBAU248 – November 2016
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PARTNUMBER
CRCW06031R50FKEA
MANUFACTURER
DAC8775EVM User’s Guide
Copyright © 2016, Texas Instruments Incorporated
19
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Products
Applications
Audio
www.ti.com/audio
Automotive and Transportation
www.ti.com/automotive
Amplifiers
amplifier.ti.com
Communications and Telecom
www.ti.com/communications
Data Converters
dataconverter.ti.com
Computers and Peripherals
www.ti.com/computers
DLP® Products
www.dlp.com
Consumer Electronics
www.ti.com/consumer-apps
DSP
dsp.ti.com
Energy and Lighting
www.ti.com/energy
Clocks and Timers
www.ti.com/clocks
Industrial
www.ti.com/industrial
Interface
interface.ti.com
Medical
www.ti.com/medical
Logic
logic.ti.com
Security
www.ti.com/security
Power Mgmt
power.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Microcontrollers
microcontroller.ti.com
Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
OMAP Applications Processors
www.ti.com/omap
TI E2E Community
e2e.ti.com
Wireless Connectivity
www.ti.com/wirelessconnectivity
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