High fidelity, near-field two-way audio reference design with noise reduction and echo cancellation


Design files


Man machine interaction requires an acoustic interface for providing full duplex hands-free communication. In hands-free mode, part of the far-end or near-end audio signal from the speaker is coupled to the microphones. Furthermore, in noisy environments the microphones also capture ambient noise in addition to the useful near-end audio signal. The captured multi-microphone audio signals are corrupted by acoustic background noise as well as by echoic signals that significantly degrade the intelligibility of the desired signal, and restrict the performance of subsequent audio processing systems. This reference design demonstrates dual microphones for audio input via stereo ADC, low-power DSP performing noise reduction, acoustic echo cancellation, and other audio quality enhancement algorithms. This design also features TI’s Smart Amp technology for high-quality and high-SPL audio output from a micro-speaker.

  • Two-way audio modular platform supporting analog or digital microphone for audio capture and playback on micro-speaker using TI Smart Amp technology
  • TLV320ADC3101 Stereo ADC with 92-dBA SNR, 0.003% THD integrated PGA , AGC, and mini-DSP for implementing decimation filtering
  • Powerful TMS320C5517 DSP for implementing various audio processing algorithms like: Adaptive Spectral Noise Reduction (ASNR) and Acoustic Echo Cancellation (AEC) handling echo tails up-to 128ms
  • Smart Amp TAS2557 with integrated ultra-lownoise audio DAC, class-D power amplifier and built-in speaker sensing/protection to deliver high
    SPL using micro-speaker
  • Attaches to AM335x-based BeagleBone™ Black Wireless to support optional Cloud connectivity
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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.

TIDUE77.PDF (7967 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


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


Detailed overview of design layout for component placement

TIDRXB8.ZIP (3682 K)

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

TIDCEX9.ZIP (1589 K)

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

TIDRXB7.ZIP (1926 K)

PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

Audio ADCs

TLV320ADC310192-dB SNR low-power stereo ADC with digital microphone support and miniDSP

Data sheet: PDF | HTML
Digital signal processors (DSPs)

TMS320C5517Low power C55x fixed point DSP- up to 200MHz, USB, LCD interface, FFT HWA, SAR ADC

Data sheet: PDF | HTML
ESD protection diodes

TPD2EUSB30Dual 0.7-pF, 5.5-V ±8-kV ESD protection diode with 5-A surge rating for USB 3.0

Data sheet: PDF | HTML
ESD protection diodes

TPD6F0036 channel 5.5-V, ±12kV ESD protection & EMI Filter with 200-MHz -3-dB

Data sheet: PDF | HTML
Load switches

TPS22912C5.5-V, 2-A, 60-mΩ load switch with active high enable

Data sheet: PDF | HTML
Load switches

TPS229155.5-V, 2-A, 39-mΩ load switch with output discharge

Data sheet: PDF | HTML

CSD23280F3-12-V, P channel NexFET™ power MOSFET, single LGA 0.6 mm x 0.7 mm, 116 mOhm, gate ESD protection

Data sheet: PDF | HTML
Multi-channel ICs (PMICs)

TPS65023Power Management IC (PMIC) with 3DC/DCs, 3 LDOs, I2C Interface and DVS

Data sheet: PDF | HTML
Noninverting buffers & drivers

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

Data sheet: PDF | HTML
Speaker amps

TAS25575.7-W, digital input smart amp with integrated speaker protection, advanced EQ & 8.5-V Class-H boost

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS3850Precision window supervisor for OV & UV monitoring with window watchdog timer & programmable delay

Data sheet: PDF | HTML
Supervisor & reset ICs

TPS386000Open-drain, quad-supply voltage supervisors with programmable delay & watchdog timer

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide High Fidelity, Near-Field Two-Way Audio Reference With Noise Reduction and Echo Oct. 25, 2018
Technical article Get started with smart home audio design PDF | HTML May 09, 2019

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