TIDA-01470

PCM1864-Based Linear Microphone Board (LMB) Reference Design

TIDA-01470

Design files

Overview

This easy-to-use reference design is for applications that are cost sensitive and require clear-spoken audio, such as voice triggering and speech recognition. This reference design uses a linear-microphone array (up to four) to capture a voice signal and convert it to a digital stream that can be used by a DSP system to extract clear audio from noisy environments.

Features
  • Uses two PCM1864 4-channel audio ADCs to interface with four-microphone arrays to extract clear speaker voice from noisy environments
  • EnergySense notification for signal presence and loss that is a central part of a low-power, high-performance audio design

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUD75.PDF (956 K)

Reference design overview and verified performance test data

TIDRRC4.PDF (257 K)

Detailed schematic diagram for design layout and components

TIDRRC5.PDF (87 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRRC6.PDF (141 K)

Detailed overview of design layout for component placement

TIDRRC8.ZIP (16685 K)

Files used for 3D models or 2D drawings of IC components

TIDCDJ1.ZIP (5088 K)

Design file that contains information on physical board layer of design PCB

TIDRRC7.PDF (1220 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Audio ADCs

PCM1864103dB 4-Channel Software-Controlled Audio ADC With Universal Front End

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74LVC1G125Single 1.65-V to 5.5-V buffer with 3-state outputs

Data sheet: PDF | HTML
Noninverting buffers & drivers

SN74LVC1G126Single 1.65-V to 5.5-V buffer with 3-state outputs

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide PCM1864-Based Linear Microphone Board Reference Design May 23, 2017
Certificate PCM1864LMBEVM EU Declaration of Conformity (DoC) Jan. 02, 2019

Related design resources

Reference designs

REFERENCE DESIGN
TIDEP-0077 Audio Preprocessing System Reference Design for Voice-Based Applications TIDEP-0088 Audio Pre-Processing System Reference Design for Voice-Based Applications

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