Texas Instruments PCMx140Q1EVM-PDK User manual

EVM User's Guide: PCMX140Q1EVM-PDK
PCMx140Q1EVM-PDK Evaluation Module
Description
The ADCx140EVM-PDK is an evaluation module
(EVM) that allows the user to test the
capabilities of the PCMx140-Q1 family of devices,
which is a quad-channel, high-performance audio
analog-to-digital converter (ADC). The PCMx140-
Q1 is intended for voice-activated systems,
professional microphones, audio conferencing,
portable computing, communication, entertainment,
and automotive applications. PCMx140Q1EVM-PDK
is paired with the AC-MB (included in the kit), a
flexible motherboard that provides power, control, and
digital audio data to the EVM.
Get Started
1. Order the EVM from the PCMx140Q1EVM-PDK
product page.
2. Download the latest PCMx140-Q1 data sheet.
3. Request access and download PPC3 GUI and the
associated PCMx140Q1EVM-PDK app from the
PCMx140Q1EVM-PDK product page.
Features
• Complete performance demonstration kit (PDK) for
PCMx140-Q1
• High-performance audio ADC: 106, 108, or 113-dB
dynamic range
• Dynamic Range Enhancer (DRE) improves
dynamic range performance in far field
applications (PCM5140-Q1, and PCM6140-Q1
only)
• Rail-to-Rail CMRR performance mode (PCM6140-
Q1 only)
• Onboard microphone provided for voice-recording
testing
• Direct access to digital audio signals and control
interface for simple end-system integration
• USB connection to PC provides power, control,
and streaming audio data for easy evaluation
• Easy evaluation and demonstration via
PurePath™ Console software platform
(PUREPATHCONSOLE)
Applications
•Microphone array systems
• Voice-activated digital assistants
• Teleconferencing systems
•Security and surveillance systems
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1 Evaluation Module Overview
1.1 Introduction
This user's guide describes the function and use of the PCMx140Q1EVM-PDK. This document includes the
hardware configuration instructions, a quick-start guide, jumper and connector descriptions, software description,
schematics, and printed circuit board (PCB) layout that demonstrate TI's recommended practices for these
devices.
1.2 Kit Contents
• ADC3140EVM-PDK evaluation module
• Audio converters motherboard (AC-MB)
1.3 Specification
The PCMx140Q1EVM-PDK evaluation module (EVM) paired with the AC-MB, a flexible motherboard which
provides power, control, and digital audio data to the evaluation module allows the user to record and playback
audio signals. The configuration for the PCMx140-Q1 family of devices is done through the PurePath Console 3
(PPC3) GUI.
1.4 Device Information
The PCMx140Q1EVM-PDK is an evaluation module (EVM) designed to demonstrate the performance and
functionality of the PCMx140-Q1 family of devices. This family includes the devices shown in Table 1-1 with
differences in performance and function noted.
Table 1-1. PCMx140-Q1 Family
Device SNR Without DRE (dB) SNR With DRE (dB)
PCM3140-Q1 106 N/A
PCM5140-Q1 108 120
PCM6140-Q1 112 123
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2 Hardware
2.1 System Overview
Figure 2-1 shows an overview of the system.
Figure 2-1. System Overview
2.2 Hardware Overview
The evaluation kit consists of the PCMx140Q1EVM daughterboard and the AC-MB motherboard. The
motherboard is used to provide power, control, and digital audio signals to the evaluation module. The
daughterboard contains the PCMx140-Q1 device and the input connections. A detailed functional overview of
the PCMx140Q1EVM system is described in Section 2.1.
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2.2.1 AC-MB Settings
2.2.1.1 Audio Serial Interface Settings
The AC-MB provides the digital audio digital signals to the evaluation module from the universal serial bus
(USB), optical, stereo jack, and external audio serial interface (ASI) header. Figure 2-2 shows a block diagram of
the ASI routing on the AC-MB.
MUX
USB
Optical Inp ut
Stereo Analog
Input
Exte rnal ASI Header
Source
Selector
(SW2)
Audio
Processor
PCM921 1Optical Output
To EVM
Figure 2-2. AC-MB Audio Serial Interface Routing
Switch SW2 on the AC-MB selects the audio serial bus that interfaces with the TLV320ADC5140EVB. Next to
switch SW2, the AC-MB has a quick reference table to identify the audio serial interface source options and
switch settings. The AC-MB acts as the controller for the audio serial interface, with three different modes of
operation (see Figure 2-3): USB, optical or analog, or external ASI.
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2.2.1.1.1 USB
The serial interface clocks and data are provided from the USB interface. The sampling rate and format are
determined by the USB audio class driver on the operating system. The default settings for the USB audio
interface are 32-bit frame size, 48-kHz sampling rate, BCLK and FSYNC ratio is 256, and the format is time-
division multiplexing (TDM).
2.2.1.1.2
The AC-MB is detected by the OS as an audio device with the name TI USB Audio UAC2.0. Figure 2-3 shows
the AC-MB audio setting for the USB mode of operation.
ON
S1 S0
Figure 2-3. AC-MB USB Audio Setting
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2.2.1.1.3 Optical or Auxiliary Analog Audio Input
Serial interface signals are provided from the PCM9211 digital transceiver, which is capable of sending digital
data to the EVB from an analog input or optical input. Meanwhile, the data from the EVB can be streamed
through the optical output. Figure 2-4 shows the AC-MB audio setting for the optical and analog mode of
operation.
ON
S1 S0
Figure 2-4. AC-MB Optical or Auxiliary Analog Audio Setting
The optical output of the AC-MB streams the data captured on the EVM with the format determined by the
input source used. When there is an optical input connected, the LOCK LED must be ON, and the PCM9211
streams the audio serial interface clocks with the format determined by the optical input frame. The digital data
from the optical input is streamed to the evaluation module. If the optical input is not connected, the PCM9211
captures the input signal provided through the analog input, and streams the signal to the evaluation module.
This feature can be useful when a digital input DAC is connected to the AC-MB, providing an analog input for
quick evaluation. In Auxiliary Analog Audio mode the audio serial interface format is fixed to a 24-bit, 48-kHz, I2S
mode.
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2.2.1.1.4 External
In this mode, the audio serial interface clocks for the evaluation board are provided through connector J7 from
an external source. This architecture allows the use of an external system to communicate with the evaluation
board, such as a different host processor or test equipment (for instance, Audio Precision PSIA). The clocks
generated from the USB interface and PCM9211 are isolated with this setting. Figure 2-5 shows the AC-MB
audio setting for the external mode of operation.
ON
S1
Figure 2-5. AC-MB External Audio Setting
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Figure 2-6 shows how to connect the external audio interface, with the bottom row for the signal and the top row
for ground.
Host Processor / Audio Analyzer
MCLK BCLK
FSYNC
DIN DOUT
GND
Figure 2-6. AC-MB Connection with External Audio Serial Interface
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2.2.1.2 AC-MB Power Supply
The complete EVM system is powered from a single 5-V power supply. However, the motherboard has different
low-dropout regulators (LDOs) integrated that provide the required power supplies to the different blocks of the
board. Figure 2-7 shows a block diagram depicting the power structure of the AC-MB.
To EVM
Figure 2-7. Power-Supply Distribution of the AC-MB
The AC-MB can be powered from the host computer by using the USB 5-V power supply (VBUS) by shorting
header J5, USB POWER. Additionally, the AC-MB can be powered from an external power supply connected to
terminal J4, EXTERNAL POWER. Header J5 must be open for external supply operation. The IOVDD voltage
for the digital signals that is provided to the evaluation module is generated on the motherboard from the main
power supply (USB or external). The voltage levels available are 1.8 V and 3.3 V, and can be selected via
the J3 header IOVDD. For 1.8-V operation, short pins 2 and 3 of header J3; for 3.3-V operation, short pins 1
and 2. When the motherboard is fully powered and the power supplies from the onboard LDOs are correct, the
green POWER LED (D3) turns ON. The USB READY LED indicates that a successful USB communication is
established between the AC-MB and the host computer.
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2.2.2 PCMx140Q1EVM-PDK Hardware Settings
The PCMx140-Q1 evaluation module has several input configuration options and offers extensive flexibility to
allow the user to evaluate the device across multiple operation modes. The different operation modes are
highlighted in this section. The INxP and INxM pins of the PCMx140-Q1 can optionally connect to an onboard
microphone for quick evaluation, and can be optionally configured to bypass the input decoupling capacitors for
evaluating the functionality of the digital microphones or GPIOs. Figure 2-8 shows the architecture of the inputs
to the evaluation module.
MK1
IN1P IN1M IN2P IN2M IN3P IN3M IN4P IN4M
TLV320ADCx140
IN1P IN1M IN2P IN2M IN3P IN3M IN4P IN4M
J16
J15
J5 J6 J7 J8 J9 J10 J11 J12
Figure 2-8. PCMx140Q1EVM Input Architecture
When using I2C control, headers J18 and J19 pull down the device pins ADDR0 and ADDR1. This allows the
EVM to respond to the 4 different I2C addresses available in the device. Table 2-1 shows the 7bit I2C addresses
that correspond to each combination of J18 and J19.
Table 2-1. I2C Address Selection
J18 J19 Address
0 0 0x4C
0 1 0x4D
1 0 0x4E
1 1 0x4F
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2.2.2.1 Line Inputs
For the line input configuration (shown in Figure 2-9), the PCMx140Q1 captures the audio signal provided
through terminals J2 (IN1), J3 (IN2), J4 (IN3), and J5 (IN4). The input accepted in this mode is a differential,
2-VRMS, full-scale audio signal. If a single-ended source is used, the 1-VRMS signal is supported.
Figure 2-9. PCMx140Q1EVM Connection for Line Input Application
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2.2.2.2 Onboard Microphone Input
For the onboard microphone input configuration (shown in Figure 2-10), the PCMx140Q1 records the audio
captured from the microphones located on the bottom edge of the board. MICBIAS is used to power the
onboard microphone, so header J14 must be shorted. There must not be any connections to J1 during onboard
microphone use to preserve the performance of the microphone.
Figure 2-10. PCMx140Q1EVM Connection for the Onboard Microphone Test
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3 Software
3.1 Software Overview
Texas Instruments' PurePath™ Console 3 (PPC3) graphical development suite is a program that serves as a
platform for many of TI's audio products. PPC3 is designed to simplify the evaluation, configuration, and debug
process associated with the development of audio products.
3.1.1 PurePath Console 3 Installation
The PCMx140Q1EVM-PDK GUI is an application that installs into the PPC3 framework. PPC3 must be
installed prior to downloading the PCMx140Q1EVM-PDK GUI. To download the PPC3, visit www.ti.com/tool/
PUREPATHCONSOLE and request access. If the PPC3 is already installed, proceed to Section 3.1.2. Figure 3-1
shows the setup directory for the PPC3 installation.
Figure 3-1. PurePath Console 3 Installation
Open the PPC3 installer and follow the instructions in the setup wizard.
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3.1.2 PCMx140Q1EVM GUI Installation
3.1.2.1 Software Setup
Open the PPC3 application in the directory chosen for the GUI installation in Section 3.1.1. Figure 3-2 shows the
resulting app center window. Click on the PCMx140Q1 app tile.
Figure 3-2. PurePath Console 3 App Center
The PCMx140Q1 GUI is designed to work with up to four devices at any time. As shown in Figure 3-3, choose
the 1 device radial button and click New.
Figure 3-3. Initial GUI Configuration
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As shown in Figure 3-4, the GUI opens to the Audio Config tab.
Figure 3-4. Audio Config Tab
Before changing any parameters, check the lower left corner of the PPC3 window, as shown in Figure 3-5, to
verify that the EVM is connected. If there is not an EVM detected, then the text reads PCMx140Q1 offline. If the
EVM is detected, then a Connect button appears. Clicking this button connects the hardware.
Figure 3-5. Hardware Connect
When the hardware is connected, the Connect button changes to read Disconnect, and the device is ready to be
configured.
3.2 Quick Start
Configure the AC-MB for the USB audio (TDM) and the PCMx140Q1EVM for the onboard microphone input.
All configurations for this example are done on the audio configuration tab. In the Audio Configuration block in
the lower right portion of the audio configuration tab (as shown in Figure 3-6), select a word length of 16 bits, and
enable the ASI output channel 1.
Figure 3-6. Audio Configuration
As shown in Figure 3-7, select AVDD for the MIC bias voltage and power-up the MIC bias.
Figure 3-7. MIC Bias Configuration
The default state for the PCMx140Q1 is standby mode and, with the exception of the channel digital volume, all
device configurations must be done in standby mode. The PCMx140Q1 does not provide a digital audio output in
standby mode. Figure 3-8 shows how to change the mode from standby to active.
Figure 3-8. Standby to Active Mode
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When active mode is enabled, any controls not configurable in active mode are grayed out. These controls can
be changed again when the device is brought out of active mode. Figure 3-9 shows which controls are disabled.
Figure 3-9. Disabled Controls in Active Mode
Audio can now be captured on your PC using the audio program of your choice.
3.2.1 Configuring the Audio Serial Bus for the I2S Output
The PCMx140Q1 features a highly flexible audio serial bus that can be configured to implement a wide range of
data formats. The default format is TDM, however the GUI can be used to change the data format to I2S. This
section describes how to configure the PCMx140Q1EVM for a 2-channel I2S output to a USB audio at 16 bits
and 48 kHz. Configure the AC-MB for USB audio as described in Section 3.2. As shown in Figure 3-10, select
the audio serial bus tab.
Figure 3-10. Audio Serial Bus Tab
In the ASI format configuration pane (shown in Figure 3-11), change the protocol format to I2S, and the word
length to 16 bits.
Figure 3-11. ASI Format Configuration
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When the protocol format is changed to I2S in the GUI, the USB audio processor on the AC-MB also changes
the audio format to I2S. The GUI reads the ASI status register (page 0 register 0x15), providing the detected
sampling rate and BCLK and FSYNC ratio. The ASI status register can also be read manually in the audio serial
bus tab by clicking the Read button, as shown in Figure 3-12, in the clock monitor pane.
Figure 3-12. Clock Monitor Pane
The default slot assignment for channel 1 is left slot 0 and the default slot assignment for channel 2 is left slot
1. As shown in Figure 3-13, change the channel 2 slot assignment to right slot 0. The diagram at the top of the
window updates to display the data format and slots selected.
Figure 3-13. Channel Output Configuration and Diagram
3.2.2
The AC-MB USB audio currently supports only two channels per data line when in I2S mode and the BCLK and
FSYNC ratio is fixed at 64. The EVM is now ready for use with the audio recording program of your choice.
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3.2.3 Saving a Configuration
To save a configuration, as shown in Figure 3-14, click the upper left corner of the PPC3 window and select
Save. The configuration is saved as a .ppc3 file. To load a saved configuration, click the upper left corner of the
PPC3 window and select Open. Navigate to the location of the saved .ppc3 file, and click Open.
Figure 3-14. Saving a Configuration in PPC3
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3.3 Matlab Audio Capture Example
The driver for the AC-MB can be controlled with Matlab, allowing for some automated testing. The following code
demonstrates capturing audio from the AC-MB with Matlab. This example requires the Audio Toolbox™.
if ismac % macOS driver
deviceReader = audioDeviceReader( 'Device', 'TI USB Audio 2.0',…
'SampleRate', 48000, …
'NumChannels', 8 ,…
'BitDepth', '32-bit float',…
'OutputDataType','double');
elseif ispc % windows driver
devoiceReader = audioDeviceReader( 'Driver','ASIO', 'Device', 'Texas Instruments USB Audio ...',…
'SampleRate', 48000, …
'NumChannels', 8 ,…
'BitDepth', '32-bit float',…
'OutputDataType','double’);
end
setup(deviceReader);% Setup the device reader
% Play out a file through PC and capture in the EVM
info = audioinfo( infile_name );% Read audiophile infile_name
fileReader = dsp.AudioFileReader( infile_name );% Create fileReader object
fileInfo = audioinfo(infile_name);% Copy info from infile_name
fileWriter = dsp.AudioFileWriter( outfile_name, 'SampleRate', deviceReader.SampleRate, 'DataType',
'int32’);% Create fileWriter object
audioOut = audioDeviceWriter('SampleRate', fileInfo.SampleRate);% Setup audio playback
setup( audioOut, zeros(deviceReader.SamplesPerFrame, fileInfo.NumChannels) );
while ~isDone(fileReader)% For each block played out, record the block from EVM
audioToPlay = fileReader();% Read a chunk of audio from infile_name
audioOut(audioToPlay);% Play a chance of audio
[audioRead, numOverrun] = deviceReader();% Grab a chunk of audio from EVM
fileWriter(audioRead);% Write the chunk of audio from EVM to a file
end
release(audioOut);% Close all objects
release(fileReader);
release(fileWriter);
release(deviceReader);
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4 Hardware Design Files
4.1 PCMx140Q1EVM-PDK Schematic and Bill of Materials
This section provides the schematics and bill of materials (BOM) for the PCMx140Q1EVM-PDK.
4.1.1 PCMx140Q1EVM-PDK Schematic
Figure 4-1 shows the schematics for the PCMx140Q1EVM-PDK.
GND
GND
AVDDIOVDD
GND
J5
ADD0/SCLK
GND
GND
ADD1/MISO
GND
16V
C1
0.1uF
16V
C3
0.1uF
SHDNz
DOUT
BCLK
FSYNC
GPIO1
MICBIAS
GND
GND
GND
J6
J8
J9
J10
J11
J12
J7
IN1P
IN1M
IN2P
IN2M
IN3P
IN3M
IN4P
IN4M
16V
C7
0.1uF
16V
C9
0.1uF
GND GND GND GND
16V
1uF
C5
GND
ADD0/SCLK
ADD1/MISO
IOVDD-MBIOVDD-MB
GNDGND
R13
2.2k
R11
Control Interface Selection
2.2k
GPIO1
GND
MCLK
INTz
R3
GPIO1 Selection
J13
GPIO1
VREF AREG DR EG
TP1
IN1P
TP2
IN1M
TP3
IN2P
TP4
IN2M
TP5
IN3P
TP6
IN3M
TP7
IN4P
TP8
IN4M
GND
GPIO1 is optional for MCLK or INTz
0
R1
TLV320AICx140 CIRCUIT
IN1P_GPI1
IN2P_GPI2
IN3P_GPI3
IN4P_GPI4
IN1M_GPO1
IN2M_GPO2
IN3M_GPO3
IN4M_GPO4
MICBIAS
IOVDD-MB IOVDD
GND
TP9
GND GND
TP10
AVDD
GND
+3.3V
TP16
MICBIAS
MICBIAS
TP11
AVDD
AVDD
TP12
IOVDD
IOVDD
JMP1 JMP2
Power Test Points
VREFAREG
DREG
TP13
AREG
DREG
TP14
TP15
VREF
SCL/MOSI
SDA/SSZ
SCL/MOSI
SDA/SSZ
R6
0
R8
R5
R4
SCL
SDA
MISO
MOSI
SCLK
SS0
R7
0
From DUT
R9
SPI I²C
R2
MICBIAS
J15
J16
IN1P
IN1M
GND
VDD
1
OUT+ 3
GND
4
2
OUT-
MK1
AMIC1P
AMIC1M
J14
GND
16V
C11
0.1uF
On-Board Microphone
SCL
SDA
SS0
SCLK
MISO
MOSI
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
21 22
23 24
25 26
27 28
29 30
31 32
33 34
35 36
37 38
39 40
41
42
43 44
J17
GND
+5V
IOVDD-MB
DIN1
DOUT
MCLK
BCLK
FSYNC
DIN2
DOUT2
GPO2
GPI2
GNDGND
GPO1
DIN3
DIN4
DOUT3
DOUT4
SS1
INTz
Connector to AC-MB
TP17
IOVDD-MB
TP18
+5V
+5VIOVDD-MB
RSTz
SHDNz
RSTz
GND GND
+5V
GND GND
+3.3V
GND
OUT 1
NC
2
NR 3
GND 4
EN
5
NC
6
NC
7
IN
8
PAD 9
U2
GND
TPS735xxDRB-Q1
GND
16V
C13
0.1uF
16V
10uF
C12
16V
C23
0.1uF 16V
10uF
C24
16V
On-Board +3.3V Power Supply
C22
0.01uF
Green
12
D1
442
R15
+3.3V
Power
Power LED
GND
IOVDD-MBIOVDD-MB
SCL
SDA
2.2k
R16
16V
0.1uF
C25
GND
GND GND
EEPROM for Firmware ID
2.2k
R17
IOVDD-MB
2.2k
R18
External RST Option
From Motherboard
To DUT
0
R14
Digital Signal T est Points
SHDNzDOUT
MCLK
BCLK
FSYNC SCL
SDA
5TP2
SHDNz
1TP2
DOUT
TP19
FSYNC
0TP2
BCLK
2TP2
MCLK
3TP2
SCL
4TP2
SDA
INTz
6TP2
INTz
MISO
MOSI
7TP2
MISO
8
MOSI
TP2
SCLK
9TP2
SCLK
SS0
0TP3
SS0
From DUT
From Motherboard
To DUT
Jumper Description
J14
Designator
I²C Address
J15
J16
J5-J12
Function
MICBIAS Connection to On-Board Mic
IN1P Connection to On-Board Mic
IN1M Connection to On-Board Mic
Designator Function
J13
Capacitor Bypass for direct connection from
DUT input pins to input terminals
Connection to DUT GPO
1
2
3
J1
Populate resistors according to
the desired control interface
1
2
3
J2
1
2
3
J3
1
2
3
J4
16V
1uF
C2
10V
10uF
C8
10V
10uF
C10
10V
C4
10uF
16V
1uF
C6
GND
AVDD
1
IOVDD
19
7IN1M_GPO1
6IN1P_GPI1
9IN2M_GPO2
8IN2P_GPI2
11 IN3M_GPO3
10 IN3P_GPI3
13 IN4M_GPO4
12 IN4P_GPI4
16
ADDR0_SCLK
ADDR1_MISO 15
SDA_SS 18
SHDN 14
2
AREG
BCLK 22
DREG 24
FSYNC 23
GPIO1 20
MICBIAS
5
SCL_MOSI 17
SDOUT 21
25
Thermal Pad
3
VREF
4
AVSS
GND A1
GND A2
GND A3
A4
GND
U1
PCM3140 QRGERQ1
A0
1
A1
2
A2
3
VSS
4SDA 5
SCL 6
WP 7
VCC 8
U3
24FC512-I/ST
J18 J19
16V
1uF
C14
16V
1uF
C15
16V
1uF
C16
16V
1uF
C17
16V
1uF
C18
16V
1uF
C19
16V
1uF
C20
16V
1uF
C21
Figure 4-1. PCMx140Q1EVM-PDK Schematics
Hardware Design Files www.ti.com
20 PCMx140Q1EVM-PDK Evaluation Module SBAU443 – NOVEMBER 2023
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