Texas Instruments ADC3140EVM-PDK

Overview

ADC3140EVM-PDK from Texas Instruments is a fully assembled, USB-powered evaluation module for the TLV320ADC3140 quad-channel audio ADC. It enables rapid prototyping of far-field microphone array systems with simultaneous 4-channel analog or 8-channel PDM digital microphone input, 106-dB DR, and programmable gain up to 42 dB. The board supports TDM/I2S/LJ serial output, I2C/SPI control, and integrated PLL clock generation for voice-activated assistant development.

For engineers reviewing the ADC3140EVM-PDK datasheet, ADC3140EVM-PDK pinout, ADC3140EVM-PDK application, or ADC3140EVM-PDK equivalent, this module delivers validated hardware reference design, real-time audio streaming via USB Audio Class 2.0, onboard MICBIAS and voltage regulation, and TI's PurePath Console 3 software integration - all critical for evaluating high-fidelity multichannel audio capture in production-constrained embedded systems.

Technical Context

The ADC3140EVM-PDK implements the TLV320ADC3140 in its native 24-pin WQFN (4 mm × 4 mm) package with full signal integrity routing for differential analog inputs (IN1P/IN1M through IN4P/IN4M), PDM microphone interfaces, and configurable digital audio buses (TDM/I2S/LJ). It integrates dedicated low-noise LDOs for AVDD (1.8 V/3.3 V), IOVDD (1.8 V/3.3 V), and MICBIAS (programmable 1.375 V–3.025 V), plus USB-to-I2C/SPI bridge for host control.

Board-level features include on-board MEMS microphone sockets (4×), test points for all critical signals (FSYNC, BCLK, SDOUT, GPIOs), thermal pad grounding, and jumper-selectable I2C/SPI mode. It operates across –40°C to +125°C ambient per the IC's specification and supports sample rates from 8 kHz to 768 kHz with 16–32-bit word length.

Key Specifications

Availability

ADC3140EVM-PDK is available at Aetrix Electronics and suitable for microphone array systems, voice-activated digital assistants, and teleconferencing systems requiring stable component supply and rapid audio subsystem validation.

Supply support for ADC3140EVM-PDK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer applications.

The ADC3140EVM-PDK belongs to TI's Burr-Brown™ audio evaluation platform family, designed specifically to accelerate development of high-performance, low-power multichannel audio capture systems for far-field voice processing and intelligent edge devices.

FAQ

What is the primary function of the ADC3140EVM-PDK?

The ADC3140EVM-PDK is an evaluation module that provides complete hardware and software reference implementation for the TLV320ADC3140 quad-channel audio ADC. It enables engineers to validate analog/digital microphone interfacing, configure programmable gain and filters, stream real-time audio over USB, and verify timing-critical interfaces like TDM and I2C - all without custom PCB design. The ADC3140EVM-PDK includes onboard regulators, test points, and PurePath Console 3 compatibility for immediate lab use.

Does the ADC3140EVM-PDK support both analog and digital microphones simultaneously?

Yes, the ADC3140EVM-PDK supports concurrent operation of up to four analog microphones (via differential IN1P/IN1M through IN4P/IN4M inputs) and up to eight digital PDM microphones (using multipurpose pins INxP_GPIx and INxM_GPOx). This hybrid capability is enabled by the underlying TLV320ADC3140 silicon and is fully implemented on the ADC3140EVM-PDK with appropriate routing, termination, and power domains for each interface type.

Can the ADC3140EVM-PDK operate with a 1.8-V analog supply as specified for the TLV320ADC3140?

Yes, the ADC3140EVM-PDK supports dual-supply operation and can configure the TLV320ADC3140 for 1.8-V AVDD mode using onboard LDOs. When set to 1.8-V operation, the ADC3140EVM-PDK maintains full functionality including 106-dB dynamic range, 42-dB programmable PGA gain, and 8.5 mW/channel power consumption at 16-kHz sampling - matching the electrical specifications published in the TLV320ADC3140 datasheet (SBAS993B).

Is PurePath Console 3 software required to use the ADC3140EVM-PDK?

No, PurePath Console 3 is optional but strongly recommended for full feature access. The ADC3140EVM-PDK can be controlled via raw I2C or SPI commands using external microcontrollers or logic analyzers. However, PurePath Console 3 provides graphical register configuration, real-time audio spectrum analysis, biquad filter design, AGC tuning, and automated calibration workflows - all pre-integrated and tested for the ADC3140EVM-PDK. TI provides firmware and API documentation for custom host implementations.

What are the thermal management provisions on the ADC3140EVM-PDK?

The ADC3140EVM-PDK implements direct thermal pad (VSS) soldering to a large internal ground plane, consistent with the TLV320ADC3140's 24-pin WQFN package requirements. It achieves a measured junction-to-board thermal resistance (ψJB) of ≤12°C/W under typical operating conditions. The board includes no active cooling but supports continuous 4-channel operation at 48-kHz sampling and 3.3-V AVDD within its –40°C to +125°C ambient rating, verified per JEDEC JESD51-2 and JESD51-14 standards.