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Texas Instruments DRV601EVM - User guides
User's Guide
SLOU215 – January 2008
DRV601EVM
This user’s guide describes the operation of the DRV601EVM stereo line driver evaluation module and
provides measurement data and design information such as the schematic, bill of materials, and
printed-circuit board layout.
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8
Contents
Overview ...................................................................................................................... 2
Quick Setup Guide........................................................................................................... 3
Shutdown ..................................................................................................................... 5
Component Selection ....................................................................................................... 5
Layout Recommendations .................................................................................................. 7
DRV601EVM Performance ................................................................................................. 8
Related Documentation from Texas Instruments ...................................................................... 19
Design Documentation .................................................................................................... 19
List of Figures
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2
3
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23
24
DRV601EVM ................................................................................................................. 2
DRV601 Functional Block Diagram ....................................................................................... 3
DRV601EVM Physical Structure ........................................................................................... 3
Power-Up/Down Sequence ................................................................................................. 5
Second-Order, Active Low-Pass Filter .................................................................................... 6
THD+N vs Voltage (600 Ω) ................................................................................................. 9
THD+N vs Voltage (600 Ω) ................................................................................................. 9
THD+N vs Voltage (100-kΩ load) ........................................................................................ 10
THD+N vs Voltage (100-Ω load) Linear Scale ......................................................................... 10
THD+N vs Voltage (600-Ω Load) ........................................................................................ 11
THD+N vs Voltage (100-kΩ Load) ....................................................................................... 11
THD+N vs Frequency (600-Ω Load) ..................................................................................... 12
THD+N vs Frequency (600-Ω Load) Using X7R Input Capacitors .................................................. 12
FFT Spectrum With –60-dBFS Tone .................................................................................... 13
Idle Noise FFT Spectrum (BTL) .......................................................................................... 13
Channel Separation ........................................................................................................ 14
Channel Separation, 10x Lower Feedback Impedance ............................................................... 15
Frequency Response ...................................................................................................... 15
Phase Response ........................................................................................................... 16
Pop/Click (Enable) ......................................................................................................... 17
Pop/Click (Disable) ......................................................................................................... 18
DRV601EVM PCB Component Placement Top ........................................................................ 21
PCB Top Layer ............................................................................................................. 21
PCB Bottom Layer ......................................................................................................... 22
List of Tables
1
2
3
4
DRV601 Features ............................................................................................................
Recommended Supply Voltage ............................................................................................
DRV601EVM Specification .................................................................................................
General Test Specifications ................................................................................................
2
5
6
8
PurePath Digital, DirectPath, FilterPro are trademarks of Texas Instruments.
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Overview
5
6
7
8
9
1
Electrical Data ................................................................................................................ 8
Audio Performance .......................................................................................................... 8
Physical Specifications ...................................................................................................... 8
DRV601EVM Parts List .................................................................................................... 20
PCB Specifications ......................................................................................................... 20
Overview
The DRV601EVM customer evaluation module (EVM) demonstrates the integrated circuits DRV601RTJ
from Texas Instruments (TI).
The DRV601 is a stereo line driver designed to allow the removal of the DC-blocking capacitors for
reduced component count and cost. The DRV601 is ideal for single-supply electronics where size and
cost are critical design parameters ().
The DRV601 is capable of driving 2 Vrms into a 600-Ω load at 3.3-V supply. The DRV601 has external
gain-setting resistors, that support a gain range of -1 V/V to -10 V/V and line outputs that have ±8 kV IEC
ESD protection. The DRV601 has independent shutdown control for the left and right audio channels.
This EVM is configured with two RCA phone input connectors and two RCA phone output connectors.
Power supply is connected via a two-pin 2,54-mm pin header.
The EVM is configured with a gain of –2 V/V.
Table 1. DRV601 Features
KEY PARAMETERS
Supply Voltage
1.8 V to 4.5 V
Number of Channels
2
Load Impedance
Minimum 600 Ω
Output Voltage
2 Vrms / 600 Ω < 0.005% THD
DYR
> 108 dB
Gain
–2 V/V
This EVM is designed for evaluating applications such as A/V receivers, DVD receivers, DVD
minicomponent systems, home theater in a box (HTIB) designs, or set-top boxes.
This document covers EVM specifications, audio performance and power efficiency measurements
graphs, and design documentation that includes schematics, parts list, layout, and mechanical design.
Figure 1. DRV601EVM
Gerber (layout) files are available at the TI Web site.
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Quick Setup Guide
1.1
DRV601EVM Features
•
•
•
•
Two-channel evaluation module, a double-sided, plated-through printed-circuit board (PCB) layout.
2-VRMS line output
Output capacitor-less.
Shutdown button
Functional Block Diagram
Rfb
SVDD
Audio In - R
Audio Out - R
Rin
SVSS
SGND
SVDD
Short
Circuit
Protection
Audio Out - L
Audio In - L
Rin
Rfb
SVSS
C1P
SDx
Charge
Pump
Bias
Circuitry
C1N
PVSS
Figure 2. DRV601 Functional Block Diagram
1.2
PCB Key Map
The physical structure of the DRV601EVM is shown in Figure 3.
Figure 3. DRV601EVM Physical Structure
2
Quick Setup Guide
This section describes the DRV601EVM board in regards to power supply and system interfaces. It
provides information regarding handling and unpacking, absolute operating conditions, and a description
of the factory default switch and jumper configuration.
The following is a step–by–step guide to configuring the DRV601EVM for device evaluation.
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Quick Setup Guide
2.1
Electrostatic Discharge Warning
Many of the components on the DRV601EVM are susceptible to damage by electrostatic discharge (ESD).
Customers 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.
CAUTION
Failure to observe ESD handling procedures may result in damage to EVM
components.
2.2
Unpacking the EVM
On opening the DRV601EVM package, ensure that the following items are included:
• 1 DRV601EVM board with one DRV601RTJ
• 1 pc. PurePath Digital™ CD-ROM
If either of these items is missing, contact the Texas Instruments Product Information Center nearest you
to inquire about a replacement.
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Shutdown
2.3
Power Supply Setup
To power up the EVM, one power supply is needed. The power supply is connected to the EVM using a
2-pin, 2,54-mm pin header, J10.
Table 2. Recommended Supply Voltage
Description
Voltage Limitations
Power supply
1.8 V to 4.5 V
Current Requirement
Cable
0.3 A
CAUTION
Applying voltages above the limitations given in Table 2 may cause permanent
damage to your hardware.
3
Shutdown
For minimum click and pop during power on and power off, the shutdown pin should be kept low. The
preferred power-up/down sequence is shown in Figure 4.
DVDD
SHUTDOWN
> 50ms
> 50ms
Figure 4. Power-Up/Down Sequence
4
Component Selection
4.1
Charge Pump
The charge pump flying capacitor, C13, serves to transfer charge during the generation of the negative
supply voltage. The PVSS capacitor must be at least equal to the charge pump capacitor in order to allow
maximum charge transfer. Low ESR capacitors are an ideal selection, and a value of 1 µF is typical.
Capacitor values smaller than 1 µF can be used, but the maximum output can be reduced. It is therefore
recommended to validate the design with thorough testing.
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Component Selection
4.2
Decoupling Capacitors
The DRV601 is a DirectPath™ line driver amplifier that requires adequate power supply decoupling to
ensure that the noise and total harmonic distortion (THD) are low. A good low equivalent-series-resistance
(ESR) ceramic capacitor, C12, typical 1 µF, placed as close as possible to the device VDD leads works
best. Placing this decoupling capacitor close to the DRV601 is important for the performance of the
amplifier. For filtering lower frequency noise signals, a 10-µF or greater capacitor placed near the audio
amplifier also helps, but is not required in most applications because of the high PSRR of this device.
The charge pump circuit does apply ripple current on the VDD line, and a LC or RC filter may be needed if
noise-sensitive audio devices share the VDD supply.
4.3
Supply Voltage Limiting at 4.5 V
The DRV601 has a build-in charge pump which serves to generate a negative rail for the line driver.
Because the line driver operates from a positive and negative voltage supply, circuitry has been
implemented to protect the devices in the amplifier from an overvoltage condition. Once the supply is
above 4.5 V, the DRV601 can shut down in an overvoltage protection mode to prevent damage to the
device.
4.4
Using the DRV601 as a Second-Order Low-Pass Filter
Many of the audio DACs used today require an external low-pass filter, to remove band noise. This is
possible with the DRV601, and the EVM is configured as a 40-kHz second-order, active Butterworth filter.
The topology chosen is the MFB Single-Ended. Further, the DRV601 needs a ac-coupling capacitor to
remove dc-content from the source.
R2
C2
R1
C3
R3
+
C1
Figure 5. Second-Order, Active Low-Pass Filter
The component values can be calculated with the help of the TI FilterPro™ program available on:
http://focus.ti.com/docs/toolsw/folders/print/filterpro.html
In Table 3, various proposals for the filter and gain settings can be found.
Table 3. DRV601EVM Specification
Gain
High Pass
Low Pass
C1
C2
C3
R1
R2
R3
–1 V/V
16 Hz
40 kHz
100 pF
680 pF
1 µF
10 kR
10 kR
24 kR
-1.5 V/V
19 Hz
40 kHz
68 pF
680 pF
1 µF
8.2 kR
12 kR
30 kR
-2 V/V
11 Hz
40 kHz
33 pF
330 pF
1 µF
15 kR
30 kR
47 kR
–2 V/V
11 Hz
30 kHz
47 pF
470 pF
1 µF
15 kR
30 kR
43 kR
–3.33 V/V
12 Hz
40 kHz
33 pF
470 pF
1 µF
13 kR
43 kR
43 kR
-10 V/V
15 Hz
30 kHz
22 pF
1 nF
2.2 µF
4.7 kR
47 kR
27 kR
The resistor values should be low value to get low noise, but should be high value to get a small size
ac-coupling capacitor. With the proposed values, 15k, 30k, and47k, a DYR of 105 dB can be achieved
with a small 1-µF input ac-coupling capacitor.
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Layout Recommendations
5
Layout Recommendations
5.1
Exposed Pad on the DRV601RJT Package
The exposed metal pad on the DRV601RTJ package can be soldered to a pad on the PCB in order to
improve reliability. The pad on the PCB should be allowed to float and not be connected to ground or
power. Connecting this pad to power or ground prevents the device from working properly because it is
connected internally to PVSS.
5.2
SGND and PGND Connections
The SGND and PGND pins of the DRV601 must be routed separately back to the decoupling capacitor in
order to provide proper device operation. If the SGND pins are connected directly to each other, the part
functions without risk of failure, but the noise and THD performance can be reduced.
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DRV601EVM Performance
6
DRV601EVM Performance
This section provides general test specifications, electrical data, audio performance data, and physical
specifications.
Table 4. General Test Specifications (1)
GENERAL TEST SPECIFICATIONS
NOTES
Supply Voltage
3.3 V
600 Ω
Load Impedance
Input Signal
1-kHz Sine
Measurement Filter
(1)
AES17
These test conditions are used for all tests, unless otherwise specified.
Table 5. Electrical Data (1)
ELECTRICAL DATA SPECIFICATIONS
NOTES/CONDITIONS
Output Voltage, 600 Ω
2.2 Vrms 1 kHz, unclipped (< 1% THD), TA = 25°C
Output Voltage, 100 kΩ
2.3 Vrms 1 kHz, unclipped (< 1% THD), TA = 25°C
Supply Current
< 10 mA 1 kHz, 2 m Vrms output voltage
Supply Current
< 20 mA 1 kHz, 2 m Vrms output voltage into 600 Ω
(1)
All electrical and audio specifications are typical values.
Table 6. Audio Performance
AUDIO PERFORMANCE
NOTES/CONDITIONS
THD+N, 600 Ω
0.02 Vrms
< 0.099 % 1 kHz (Noise-limited)
THD+N, 600 Ω
0.2 Vrms
< 0.009 % 1 kHz (Noise-limited)
THD+N, 600 Ω
2 Vrms
< 0.006 % 1 kHz
THD+N, 100 kΩ
0.02 Vrms
< 0.099 % 1 kHz (Noise-limited)
THD+N, 100 kΩ
0.2 Vrms
< 0.009 % 1 kHz (Noise- limited)
THD+N, 100 kΩ
2 Vrms
Dynamic Range
< 0.005 % 1 kHz
> 105 dB Ref: 2 Vrms, A-weighted, AES17 filter
< 12 µ Vrms A-weighted, AES17 filter
Noise Voltage
DC Offset
< 5m mV No signal, 600-Ω load
Channel Separation
> 97 dB 1 kHz, 2 Vrms
Frequency Response: 20 Hz to 20 kHz
+0.5/–1 dB 2 Vrms/600Ω
Table 7. Physical Specifications (1)
PHYSICAL SPECIFICATIONS
PCB Dimensions
Total Weight
(1)
8
NOTES/CONDITIONS
50 x 60 x 25 Width x Length x Height (mm)
35g Components + PCB + Mechanics
All electrical and audio specifications are typical values.
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DRV601EVM Performance
6.1
THD+N vs Voltage (600-Ω Load)
THD+N - Total Harmonic Distortion Plus Noise - %
10
5
2
1.8 V DVDD
1
0.5
3.3 V DVDD
0.2
0.1
4.5 V DVDD
0.05
0.02
0.01
0.005
0.002
0.001
10m
20m
50m
100m
200m
500m
VO - Output Voltage - Vrms
1
2
4
Figure 6. THD+N vs Voltage (600 Ω)
The THD+N from 10m Vrms to approximately 0.5 Vrms is dominated by noise.
THD+N - Total Harmonic Distortion Plus Noise - %
10
5
1.8 V DVDD
2
1
3.3 V DVDD
0.5
0.2
0.1
4.5 V DVDD
0.05
0.02
0.01
0.005
0.002
0.001
250m 500m750m 1 1.25 1.5 1.75 2 2.25 2.5 2.75
VO - Output Voltage - Vrms
3 3.25 3.5 3.75 4
Figure 7. THD+N vs Voltage (600 Ω)
Here the THD+N versus output voltage is shown with linear scale, this makes it easier to see where
clipping occurs. Clipping is often defines as THD+N=1%. For the DRV601 this is 2.25 Vrms with a 3.3-V
supply and 600-Ω load.
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DRV601EVM Performance
6.2
THD+N vs Voltage (100-kΩ load)
THD+N - Total Harmonic Distortion Plus Noise - %
10
5
1.8 V DVDD
2
1
0.5
3.3 V DVDD
0.2
0.1
4.5 V DVDD
0.05
0.02
0.01
0.005
0.002
0.001
10m
20m
50m
100m
200m
500m
1
2
4
VO - Output Voltage - Vrms
Figure 8. THD+N vs Voltage (100-kΩ load)
The THD+N in the range from 10mVrms to 1Vrms is completely dominated by noise.
THD+N - Total Harmonic Distortion Plus Noise - %
10
5
1.8 V DVDD
2
1
3.3 V DVDD
0.5
0.2
0.1
0.05
4.5 V DVDD
0.02
0.01
0.005
0.002
0.001
250m 500m 750m 1 1.25 1.5 1.75
2 2.25 2.5 2.75
VO - Output Voltage - Vrms
3
3.25 3.5 3.75
4
Figure 9. THD+N vs Voltage (100-Ω load) Linear Scale
Here the THD+N versus output voltage is shown with linear scale; this makes it easier to see where
clipping occurs. Clipping is often defines as THD+N = 1%. For the DRV601 this is over 2.25 Vrms with a
3.3-V supply and 100-kΩ load.
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DRV601EVM Performance
6.3
THD+N vs Frequency (600R Load)
THD+N - Total Harmonic Distortion Plus Noise - %
10
5
3.3 V DVDD
2
1
3.3 V DVDD
0.5
0.2
0.1
0.05
3.63 V DVDD
0.02
0.01
0.005
0.002
0.001
1
1.2
1.4
1.6
1.8
2
2.2
2.4
2.6
2.8
3
VO - Output Voltage - Vrms
Figure 10. THD+N vs Voltage (600-Ω Load)
Here the clipping is shown with a 3.3-V supply, and ±10% tolerance. It shows that even with a low DVDD,
3.3 V–10% , the DRV601 can achieve the 2 Vrms with a THD+N less than 1%.
2 Vrms is equal to 2.848-Vpeak; that is only 142-mV drop from the 2.97-V supply
THD+N - Total Harmonic Distortion Plus Noise - dB
-20
T
-25
-30
-35
-40
3.3 V DVDD
-45
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
-100
10m
20m
50m
100m
200m
500m
VO - Output Voltage - Vrms
1
2
3
Figure 11. THD+N vs Voltage (100-kΩ Load)
With the THD+N in dB scale. 0.001% corresponds to –100 dB.
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DRV601EVM Performance
6.4
THD+N vs Frequency
THD+N - Total Harmonic Distortion Plus Noise - %
10
5
2
1
0.5
0.2
0.1
0.05
2 Vrms 600 W
0.02
2 Vrms 100 kW
0.01
0.005
0.002
0.001
20
50
100
200
500
1k
2k
f - Frequency - Hz
5k
10k
20k
Figure 12. THD+N vs Frequency (600-Ω Load)
The DRV601EVM uses a 1-µF film capacitor for ac-coupling of the input signal. If a lower cost ceramic
capacitor, like a X7R is used, higher THD at low frequencies should be expected. Y5V capacitors show
even higher THD and cannot be recommended at all.
THD+N - Total Harmonic Distortion Plus Noise - %
10
5
2
1
0.5
0.2
0.1
X7R 1 mF, 16 V, 0805
0.05
X7R 1 mF, 50 V, 1206
0.02
1 mF film
0.01
0.005
0.002
0.001
20
50
100
200
500
1k
f - Frequency - Hz
2k
5k
10k
20k
Figure 13. THD+N vs Frequency (600-Ω Load) Using X7R Input Capacitors
The X7R capacitors raise the 20-Hz THD from 0.003% to 0.04% or 0.07–20 times higher. If the cost
requirements for the system demand that an inexpensive capacitor is used, then select the X7R capacitor
with the highest voltage rating, as seen from the figure a 50-V X7R 1206 capacitor has 2x lower THD than
a 16-V X7R 0805 capacitor.
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DRV601EVM Performance
6.5
FFT Spectrum With –60 dBFS Tone
Reference voltage is 2 Vrms. FFT size 16k.
0
-10
-20
-30
-40
Amplitude - dB
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
0
2k
4k
6k
8k
10k
14k
12k
f - Frequency - Hz
16k
18k
20k
22k
Figure 14. FFT Spectrum With –60-dBFS Tone
This spectrum corresponds to a dynamic range of 104-dB A-weighted. SNR measures to 104 dB
A-weighted, <12 µVrms. This noise floor is dominated by the feedback resistor network impedance level.
This can be improved by lowering the impedance level, a 10x lower impedance level lowers the noise floor
to 110 dB, <6 µVrms.
6.6
Idle Noise FFT Spectrum
Reference voltage is 2 Vrms. FFT size 16k.
0
-10
-20
-30
-40
Amplitude - dB
-50
-60
-70
-80
-90
-100
-110
-120
-130
-140
-150
0
10k
20k
30k
40k
50k
60k
f - Frequency - Hz
70k
80k
90k
Figure 15. Idle Noise FFT Spectrum (BTL)
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DRV601EVM Performance
6.7
Channel Separation
Channel-1 output signal is 2 Vrms; channel-2 input is grounded. Reference voltage is 2 Vrms; the load is
600R.
0
-10
0 dB
-20
-30
Amplitude - dB
-40
-50
-60
Right to Left
-70
Left to Right
-80
-90
-100
-110
-120
20
50
100
200
500
1k
f - Frequency - Hz
2k
5k
10k
20k
Figure 16. Channel Separation
Left-to-right cross-coupling and right-to-left cross-coupling are not exactly the same; a difference of 15 dB
is seen at 1 kHz. The channel separation is more than 80 dB in both cases. The cause for the
cross-coupling is the high impedance of the feedback network. If a lower cross-coupling is wanted, the
feedback impedance can be lowered, this has an influence on the input coupling capacitor that needs to
be equally larger and thereby adds more cost.
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DRV601EVM Performance
6.8
Frequency Response
Measurement bandwidth filter is set to 500 kHz.
0
-10
0 dB
-20
-30
Amplitude - dB
-40
-50
-60
-70
Right to Left
-80
-90
Left to Right
-100
-110
-120
20
50
100
200
500
1k
f - Frequency - Hz
5k
2k
10k
20k
Figure 17. Channel Separation, 10x Lower Feedback Impedance
With a 10x lower impedance in the feedback network, the channel separation improved significantly and is
now >100 dB at 1 kHz. The lower impedance network also improved the noise floor, and now the dynamic
range is >110-dB , equal to <6-µVrms noise.
The parts used are: R11=R12=1k5, R16=R17=3k0, R14=R15=4k7, C17=C18=3n3, C19=C20=330 pF,
C15=C16=10 µF ac-coupling.
Measurement bandwidth filter is set to 500 kHz.
2
-0
600 W load
-2
Amplitude - dB
-4
-6
-8
-10
-12
-14
-16
-18
-20
20
50
100
200
500
1k
2k
5k
10k
20k
50k 80k
f - Frequency - Hz
Figure 18. Frequency Response
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DRV601EVM Performance
0
Amplitude - dB
-20
-40
-60
-80
-100
-120
-140
-160
-180
-200
-220
-240
600 W load
-260
-280
-300
-320
-340
-360
20
50
100
200
500
1k
2k
5k
10k
20k
50k 80k
f - Frequency - Hz
Figure 19. Phase Response
The low-frequency cutoff of 10 Hz (–3 dB) is determined by the input ac-coupling capacitor, 1 µF, together
with the feedback network input impedance of 15kR.
The low-pass, second-order filter implemented gives a –3 dB approximately at 35 kHz, and the response
is 13 dB down at 80 kHz.
6.9
Pop/Click (Enable)
No input signal is applied. The measurement results are presented both in a time domain and in a
frequency domain. The resistor load is 600 Ω.
The power supply is applied, and then the shutdown signal is released. The shutdown signal is used to
trigger the measuring system. For a description of the measuring technique, see the application report
Pop and Click Measuring Technique (SLEA044).
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DRV601EVM Performance
100m
80m
60m
Voltage - V
40m
20m
0
-20m
-40m
-60m
-80m
-100m
-2m
-1m
0
t - Time - s
1m
2m
0
-10
-20
Amplitude - dBr
-30
-40
-50
-60
-70
-80
-90
-100
300
500
1k
2k
5k
f - Frequency - Hz
10k
20k 30k
Figure 20. Pop/Click (Enable)
The DRV601 shows very low pop during enable; only two small high-frequency spikes can be seen. The
measurements are made with reference to 2 Vrms = 0 dB, 2 mV=-60 dBr.
6.10 Pop/Click (Disable)
No input signal is applied. The measurement results are presented both in a time domain and in a
frequency domain.
No input signal applied. Load: 600 Ω.
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DRV601EVM Performance
100m
80m
60m
Voltage - V
40m
20m
0
-20m
-40m
-60m
-80m
-100m
-2m
-1m
0
1m
2m
t - Time - s
0
-10
-20
Amplitude - dBr
-30
-40
-50
-60
-70
-80
-90
-100
300
500
1k
2k
5k
10k
20k 30k
f - Frequency - Hz
Figure 21. Pop/Click (Disable)
During power-down, the click is even lower than during power-on (enable). A very small click is seen.
18
DRV601EVM
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Related Documentation from Texas Instruments
7
Related Documentation from Texas Instruments
For detailed descriptions of the integrated circuits used in the design of the DRV601EVM, see data sheet
DirectPath™ Stereo Line Driver, Adjustable Gain (SLOS553).
8
Design Documentation
This section includes a schematic for the DRV601EVM, the bill of materials, and the PCB design
specifications.
8.1
DRV601EVM Schematic
+3.3 V
J10
5
NC
PVSS
OUTR
13
2
2
2
14
R16
30 kW
12
11
10
9
8
7
1
1
SVDD
OUTL
NC
SVSS
NC
6
2
GND
+3.3 V
R17
30 kW
1
2
15 kW
C17
330 pF
GND
2
1
2
47 kW R15
C20
33 pF
2
C15
R11
Phono socket
1
1 mF
4
3
2
1
1
INL
NC
C14
1 mF
GND
2
1
17
18
19
16
NC
SGND
/SDL
20
/SDR
U1
DRV601
C1N
2
1
4
PGND
15
GND
1
2
R14
C19 47 kW
33 pF
2
3
INR
Power supply
J11
2
R12
C16
1
15 kW
C18
330 pF
GND
2
1 4
3
2
1 mF
1
1
GND
C1P
1.8V to 4.5V
Header
Shutdown
1
2
1 mF
SW1
Switch
2
1
GND
1
2
PVDD
GND
C13
NC
PowerPAD
2
21
3
4
C12
1 mF
1
1
1
1
2
C11
1 mF
2
1
R13
47 kW
Phono socket
J12
GND
GND
R18
1
2
10 R
Phono socket
4
3
2
1
J21
GND
R19
1
2
10 R
Output
Phono socket
4
3
2
1
Line Driver
Gain: = R16/R11 = R17/R12 = 2.0
High Pass filter: R11-C15 = R12-C16 aprox. 10Hz
Low Pass filter: 40kHz 2nd Order Butterworth
Input
J22
GND
Layout note:
Do not ground the powerpad - keep it floating
Place C12-C13-C14 close to U10
Place R14-C19 close to pin 15
Place R15-C20 close to pin 13
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Design Documentation
8.2
Parts List
Table 8. DRV601EVM Parts List
Qty
8.3
Part Reference
Description
Manufacture
First Mfr P/N
4
C11 C12 C13 C14
Ceramic 1 µF / 16V / 20% X7R 0805 Capacitor
BC Components
0805B105M160NT
2
C15 C16
Metal Film 1uF / 16V / 20% Polyester 1210 Capacitor
Panasonic
ECPU1C105MA5
2
C17 C18
Ceramic 330 pF / 50V / 10% NP0 0603 Capacitor
BC Components
0603N331K500NT
2
C19 C20
Ceramic 33 pF / 50V / 10% NP0 0603 Capacitor
BC Components
0603N330K500NT
1
J10
2 pins / 1 row / 2,54mm Pitch Vertical Male Friction
Lock Pin Header
Molex
22-27-2021
4
J11 J12 J21 J22
Horizontal Female w. Switch Coax Phono socket
Chunfeng
RJ843-4W
1
PCB11
A834-PCB-001_2.00 / DRV601EVM Printed Circuit
Board (ver. 2.00)
Printline
A834-PCB-001(2.00)
2
R11 R12
15k / 100 mW / 5% / 0603 Thick Film Resistor
Yageo
RC0603JR-0715KL
3
R13 R14 R15
47k / 100 mW / 5% / 0603 Thick Film Resistor
Yageo
RC0603JR-0747KL
2
R16 R17
30k / 100 mW / 5% / 0603 Thick Film Resistor
Yageo
RC0603JR-0730KL
2
R18 R19
10R / 100 mW / 5% / 0603 Thick Film Resistor
Yageo
RC0603JR-0710RL
1
SW1
Switch 6 mm SMD Tactile Switch
Omron
B3S-1000
1
U1
DRV601 / DirectPath™ Audio Line Driver with external Texas Instruments
gain setting. (QFN-20)
DRV601RTJT
PCB Specifications
Table 9. PCB Specifications
20
BOARD IDENTIFICATION
A834-PCB-001(2.00)
BOARD TYPE
Double-sided plated-through board
LAMINATE TYPE
FR4
LAMINATE THICKNESS
1,6 mm
COPPER THICKNESS
35 µm (Include plating exterior layer)
COPPER PLATING OF HOLES
> 25 µm
MINIMUM HOLE DIAMETER
0,3 mm
SILKSCREEN COMPONENT SIDE
White—Remove silkscreen from solder area and pre-tinned areas
SILKSCREEN SOLDER SIDE
None
SOLDER MASK COMPONENT SIDE
Green
SOLDER MASK SOLDER SIDE
Green
PROTECTIVE COATING
Solder coating and chemical silver on free copper
ELECTRICAL TEST
PCB must be electrically tested
MANUFACTURED TO
PERFAG 2E (www.perfag.dk)
APERTURE TABLE
PERFAG 10A (www.perfag.dk)
BOARD SIZE
60 mm × 50 mm
COMMENTS
See drill information file (A834-PCB-001 (DrillDrawing).pdf)
DRV601EVM
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Design Documentation
8.4
PCB Layout
Gerber files are available on the EVM page for download.
Figure 22. DRV601EVM PCB Component Placement Top
Figure 23. PCB Top Layer
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21
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Design Documentation
Figure 24. PCB Bottom Layer
22
DRV601EVM
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EVM WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 1.8 V to 4.5 V and the output voltage range of 2 Vrms.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM. If there are questions
concerning the input range, please contact a TI field representative prior to connecting the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible permanent damage to the EVM.
Please consult the EVM User's Guide prior to connecting any load to the EVM output. If there is uncertainty as to the load specification,
please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 85°C. The EVM is designed to operate
properly with certain components above 85°C as long as the input and output ranges are maintained. These components include but are
not limited to linear regulators, switching transistors, pass transistors, and current sense resistors. These types of devices can be identified
using the EVM schematic located in the EVM User's Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
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Copyright 2008, Texas Instruments Incorporated
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