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Texas Instruments AMC1304EVM User guides
User's Guide
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AMC1304EVM User's Guide
This user's guide describes the characteristics, operation, and use of the AMC1304EVM. The
AMC1304EVM is designed for prototyping and evaluation. A complete circuit description, schematic
diagram, and bill of materials are included.
Throughout this document, the abbreviation EVM and the term evaluation module are synonymous with
the AMC1304EVM.
The following related documents are available through the Texas Instruments web site at www.ti.com.
Table 1. Related Documentation
1
2
3
4
5
6
Device
Literature Number
AMC1304
SBAS655
AMC1210
SBAS372
SN6501
SLLSEA0
TMS320F28377D
SPRS880
Contents
Overview ......................................................................................................................
Analog Interface..............................................................................................................
Digital Interface ..............................................................................................................
Power Supplies ..............................................................................................................
EVM Set-Up and Operation ................................................................................................
BOM, Schematic, and Layout ..............................................................................................
2
2
3
3
7
8
List of Figures
.......................................................................
1
AMC1304EVM Schematic: Analog Input Section
2
Power, Clock Input, and Digital Data Output ............................................................................. 3
2
3
JP1 in Ext Position ........................................................................................................... 4
4
JP1 in Iso Position ........................................................................................................... 4
5
Forward Voltage of the Rectifier Diode ................................................................................... 6
6
AMC1304EVM Silk Screen Drawing ...................................................................................... 8
List of Tables
1
Related Documentation ..................................................................................................... 1
2
AMC1304 Family Information .............................................................................................. 7
3
AMC1304EVM Bill of Materials
...........................................................................................
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1
Overview
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1
Overview
1.1
Features
•
•
•
1.2
Full-featured evaluation module for the AMC1304 single-channel, isolated, delta-sigma (ΔΣ) modulator
Screw terminals for easy access to analog inputs, clock input, and modulator data output
Optional isolated power to the AMC1304 low-dropout regulator (LDO) input derived from the controllerside power supply
Introduction
The AMC1304 is a single-channel, second-order, switched-capacitor, ΔΣ modulator with an output
separated from the input interface circuitry by a capacitive isolation barrier. The isolation barrier provides
galvanic isolation of up to 7000 VPEAK. The AMC1304 can be used to achieve 16 bits of resolution when
paired with a digital filter (such as the ΔΣ filter module in the TMS320F28377D or the AMC1210).
2
Analog Interface
The analog input to the AMC1304 is routed from the two-wire screw terminal at J2. This screw terminal
gives the user access to the inverting and noninverting inputs of the AMC1304 device installed at U1.
2.1
Analog Inputs
The analog input to the AMC1304EVM printed circuit board (PCB) consists of a simple RC filter circuit.
The input circuitry for the AMC1304 is shown in Figure 1.
Figure 1. AMC1304EVM Schematic: Analog Input Section
Note that the RC filter circuit is not required in every application; the input amplifier of the AMC1304
already provides a limited input bandwidth. See Table 2 for additional details about the analog input
bandwidth for each component in the AMC1304 family.
Note that the RC filter circuit is not required in every application; the input amplifier of the AMC1305
already provides a limited input bandwidth. Refer to Table 2 for additional details about the analog input
bandwidth for each component in the AMC1305 family.
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3
Digital Interface
The AMC1304EVM is designed for use with digital filters, such as the ΔΣ filter module in the
TMS320F28377D or the AMC1210. The power, clock input, and modulator data output of the AMC1304
device are routed to the two-wire screw terminals at J1, J3, and J4, as Figure 2 shows.
Figure 2. Power, Clock Input, and Digital Data Output
Note that component R3 in Figure 2 is marked as DNP (do not populate) because Figure 2 corresponds to
an AMC1304EVM populated with a CMOS variant of the AMC1304. Refer to Table 2 for additional details
about the analog input ranges and interfaces available in the AMC1304 family.
4
Power Supplies
Power for the controller side of the AMC1304 device is supplied through the two-wire screw terminal at J1.
The user has two options to provide power for the high side of the AMC1304 device (note that in both
options, power is provided to the LDO input on pin 6 of the AMC1304). One option is to supply the high
side of the AMC1304 through the two-wire screw terminal at J5; to accomplish that, the user must set
jumper JP1 to the position labeled Ext; see Figure 3.
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Figure 3. JP1 in Ext Position
The second option is to supply the high side of the AMC1304 with the filtered signal coming from the
isolated side of the onboard transformer T1. Note that the filtered signal on the isolated side of T1 is
generated from the power supplied to the controller side of the AMC1304 device by using the SN6501
transformer driver located at U2. To take advantage of this isolated, onboard supply, the user must set
jumper JP1 to the position labeled Iso, as shown in Figure 4.
Figure 4. JP1 in Iso Position
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The design of the isolated, unregulated power source to the AMC1304 LDO input closely follows the
TIPD121 Design Reference Guide, 0-5 A, Single-Supply, 2 kV Isolated Current Sensing Solution
(SLAU521).
The SN6501 transformer driver is used because it is designed for low-power, push-pull converters with
input voltages in the range of 3 V to 5.5 V; such voltage range fits well within the AMC1304 controller-side
supply range. Two important components in the dc-dc converter are the isolation transformer and the
rectifier diode.
4.1
Transformer Selection
To prevent the isolation transformer from saturating, its volt-seconds (V-t) product must be greater than
the maximum volt-seconds product applied by the SN6501. The maximum voltage delivered by the
SN6501 is the nominal converter input plus a 10% margin. The maximum time this voltage is applied to
the primary is half the period of the lowest frequency at the specified input voltage. The minimum
switching frequency of the SN6501 at 5-V operation is 300 kHz. Therefore, the transformer minimum V-t
product under these conditions, as determined by equations (1) and (2) in the SN6501 data sheet data
sheet, is 9.1 Vμs. The specified V-t product of the isolation transformer selected (DA2304) is well above
this 9.1-Vμs requirement.
When searching for a suitable transformer, the minimum turns ratio required must be determined; such a
ratio allows the push-pull converter to operate over the specified current and temperature range. The
minimum turns ratio required can be expressed through the ratio of secondary to primary voltage
multiplied by a correction factor that takes into account the transformer typical efficiency. Equations (3)
through (8) in the SN6501 data sheet show the specific requirements for determining the minimum turns
ratio for a given application. The DA2304 has a 1:2.2 turns ratio; such a ratio produces an unregulated,
open-circuit voltage output well within the AMC1304 low-dropout regulator input range.
4.2
Rectifier Diode Selection
The chosen rectifier diode must possess low forward voltage to provide as much voltage to the converter
output as possible. When used in high-frequency switching applications, the rectifier must also possess a
short recovery time. Schottky diodes meet both of these requirements. The MBR0520L with a typical
forward voltage of approximately 100 mV at 8-mA forward current is used in this low-voltage design.
Figure 5 illustrates the forward voltage versus forward current characteristics of the MBR0520L diode.
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Figure 5. Forward Voltage of the Rectifier Diode
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EVM Set-Up and Operation
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5
EVM Set-Up and Operation
This section describes the general operation of the AMC1304EVM.
5.1
Power and Analog Inputs: J1, J2, and J5
In the EVM default configuration the isolated onboard supply is used. In other words, power to pin 6 of the
AMC1304 is provided from the supply connected to J1 by means of an isolation transformer and the
SN6501 transformer driver. This configuration provides an isolated, unregulated source to the AMC1304
low-dropout regulator input. The isolated, unregulated, open-circuit voltage generated is between 7.85 V
and 12.8 V when the voltage applied to J1 is between 2.7 V and 5.5 V, respectively. For power provided
from high-side isolated rails (such as from a gate drive supply), move the shunt on jumper JP1 to the Ext
position (see Figure 3) so that the two-wire screw terminal at J5 can be used.
Use a voltage between 2.7 V dc and 5.5 V dc for the supply provided to J1 and a voltage between 4 V dc
and 18 V dc for the supply provided to J5.
The analog inputs to the AMC1304EVM PCB can be applied directly to the two-wire screw terminal at J2.
CAUTION
Carefully review the AMC1304 product data sheet for the limitations of the
analog input range, and ensure that the appropriate analog and digital voltages
are applied before connecting any analog input to the EVM.
Note that the AMC1304EVM is designed for evaluation of the electrical
characteristics of the AMC1304 only. The EVM is not meant for isolation tests
and is not designed to be used in a high-voltage environment.
The transformer used to derive the isolated, unregulated power source to the
AMC1304 LDO input has isolation ratings different from those of the AMC1304.
Consult the transformer manufacturer for more information on the isolation
capabilities of the transformer.
5.2
Device Operation
When the analog and digital power sources are applied to the AMC1304EVM, the digital output activates
when an external modulator clock source is applied. The internal reference of the AMC1304 is used as the
conversion reference.
Additionally, an analog input signal can be applied directly at screw terminal J2. See Figure 1 for more
details. There are four products in the AMC1304 family; Table 2 lists additional details about the analog
input ranges and interfaces available in the family.
Table 2. AMC1304 Family Information
Product
Input Voltage
Range
AMC1304M05
±50 mV
CMOS
1 MHz
AMC1304M25
±250 mV
CMOS
1.8 MHz
AMC1304L05
±50 mV
LVDS
1 MHz
AMC1304L25
±250 mV
LVDS
1.8 MHz
Interface
Input Bandwidth
When the input voltage approaches the upper end of the specified full-scale range (50 mV or 250 mV,
depending on the AMC1304 device type), the ones density of the modulator output approaches 90%.
When the input voltage approaches the lower end of the specified full-scale range (–50 mV or –250 mV,
depending on the AMC1304 device type), the ones density of the modulator output approaches 10%.
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BOM, Schematic, and Layout
6
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BOM, Schematic, and Layout
This section contains the complete bill of materials (BOM), schematic diagram, and PCB layout for the
AMC1304EVM.
NOTE: Board layouts are not to scale. These layouts are intended to show how the board is laid out
and are not intended to be used for manufacturing AMC1304EVM PCBs.
6.1
Printed Circuit Board Layout
Figure 6 shows the PCB layout.
Figure 6. AMC1304EVM Silk Screen Drawing
6.2
Schematic
The AMC1304EVM schematic is appended to the end of this document.
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BOM, Schematic, and Layout
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6.3
Bill of Materials
Note that items 14 and 16 of the bill of materials depend on the type of AMC1304 used in the EVM.
Resistor R3 is populated only when the AMC1304 used is the AMC1304L05 or the AMC1304L25. R3 is
not populated for EVMs that use the AMC1304M05 or AMC1304M25.
Table 3. AMC1304EVM Bill of Materials
Item
Qty
Reference
Designator
Description
Manufacturer
1
1
—
Printed circuit board
2
1
C1
CAP, CERM, 2.2uF, 16V, +/-10%, X7R, 0805
3
3
C2, C5, C7
4
1
C3
5
3
C4, C8, C9
CAP, CERM, 10uF, 16V, +/-10%, X5R, 0805
Taiyo Yuden
6
1
C6
CAP, CERM, 4.7uF, 10V, +/-10%, X5R, 0805
Kemet
7
2
D1, D2
8
3
FID1, FID2, FID3
Fiducial mark. There is nothing to buy or mount.
9
5
J1, J2, J3, J4, J5
Conn Term Block, 2POS, 3.5mm, TH
Phoenix Contact
1751248
Header, 3-Pin
Sullins Connector
Solutions
GRPB031VWVN-RC
Yageo America
RT0603BRD0720RL
Any
Taiyo Yuden
Mfr Part Number
N/A
EMK212B7225KG-T
CAP, CERM, 0.1uF, 25V, +/-5%, C0G/NP0, 1206
TDK
C3216C0G1E104J
CAP, CERM, 5600pF, 25V, +/-5%, C0G/NP0, 0805
TDK
C2012C0G1E562J
Diode, Schottky, 20V, 0.5A, SOD-123
ON Semiconductor
N/A
EMK212BJ106KG-T
C0805C475K8PACTU
MBR0520LT1G
N/A
10
1
JP1
11
2
R1, R2
RES, 20.0 ohm, 0.1%, 0.1W, 0603
12
1
SH-J1
Shunt, 1.27 mm
13
1
T1
1:2.2 Isolation Transformer
Texas Instruments
AMC1304
Texas Instruments
SN6501
14
1
U1
AMC1304 isolated delta-sigma modulator, 16-pin DW
(SOIC)
15
1
U2
SN6501 transformer driver
R3
RES, 50.5 ohm, 0.1%, 0.1W, 0603. Populated only on
EVMs with LVDS interface.
16
1
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Harwin Inc
Coilcraft
Yageo America
M50-2000005
DA2304-AL
RT0603BRD0750R5L
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1
2
3
4
5
6
Revision History
Revision
Notes
A
A
COJ1
J1
PIJ102 PIJ10
2
1
DVDD
DGND
COU1
U1
COR1
R1
PIR101
1
PIR102
20.0
PIC301
1
PIJ201
2
PIJ202
PIC302
COJ2
J2
B
COC3
C3
5600pF
COR2
R2
PIR201
PIR202
NC
2
PIU102
AINP
15
NC PIU1015
3
PIU103
AINN
DVDD
14
PIU1014
4
PIU104
NC
13
CLKIN PIU1013
NC
12
NC/CLKIN_N PIU1012
5
PIU105
20.0
6
PIU106
1
PIJ501
2
PIJ502
COJ5
J5
PIC401
PIC402
PIC501
PIC502
COC4
C4
10µF
COC5
C5
0.1µF
PIC601
COC6
C6
PIC602 4.7µF
16
DGND PIU1016
PIU101
7
PIU107
8
PIU108
LDO_IN
DOUT
PIC201
PIC20
COC2
C2
0.1µF
PIC10
PIC102
COC1
C1
2.2µF
PIR302
COR3
R3
DNP
50.5
2
PIJ302
B
1
PIJ301
PIR301
COJ3
J3
11
PIU1011
2
PIJ402
AVDD
10
NC/DOUT_N PIU1010
AGND
9
DGND PIU109
1
PIJ401
COJ4
J4
AMC1304
PIJP103 PIJP102 PIJP10
3
2
1
DGND
DVDD
GND
GND
COC8
C8
PIC802
COD1
D1
0.1µF
DGND
5
MBR0520LT1G
COC9
C9
PIC902
PIC701 PIC702
PIC801
10µF
DA2304-AL
PID101 PID102
PIC901
COU2
U2
4
PIT105
PIT104
6
7
PIT107
PIT103
3
2
PIT102
PIT106
10µF
C
COC7
C7
DVDD
COJP1
JP1
GRPB031VWVN-RC
8
1
PIT108
PIT101
GND
COT1
T1
COD2
D2
1
PIU201
D1
2
PIU202
5
GND PIU205
Vcc
3
PIU203 D2
4
GND PIU204
C
SN6501
DGND
PID201 PID202
MBR0520LT1G
D
D
Texas Instruments and/or its licensors do not warrant the accuracy or completeness of this specification or any information contained therein. Texas Instruments and/or its licensors do not
warrant that this design will meet the specifications, will be suitable for your application or fit for any particular purpose, or will operate in an implementation. Texas Instruments and/or its
licensors do not warrant that the design is production worthy. You should completely validate and test your design implementation to confirm the system functionality for your application.
1
2
3
4
Number: AMC1304EVM Rev: E1
SVN Rev: Not in version control
Drawn By: Jose Duenas
Engineer: Jose Duenas
5
Designed for: Public Release
Mod. Date: 7/1/2014
Project Title: AMC1304 Evaluation Module
Sheet Title: Main Schematic
Assembly Variant: CMOS_output
Sheet: 2 of 3
File: AMC1304_Main.SchDoc
Size: B
Contact: http://www.ti.com/support
6
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