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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