Four-channel PDM-input to TDM- or I²S-output converter


Product details


Number of ADC channels 4 Analog inputs 0 Digital audio interface I2S, L, TDM Control interface I2C Sampling rate (Max) (kHz) 768 ADC SNR (Typ) (dB) 127 Rating Catalog open-in-new Find other Audio ADCs

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  • 4-channel PDM microphones simultaneous conversion
  • PDM input to TDM or I2S output converter performance:
    • 127-dB dynamic range (DR) with high-performance, 5th-order PDM input
    • 117-dB dynamic range (DR) with high-performance, 4th-order PDM input
  • Channel summing mode, DR performance with high-performance, 4th-order PDM input:
    • 120-dB, 2-channel summing
  • Programmable PDM clock output:
    • 768 kHz to 6.144 MHz
  • Programmable output sample rate (fS):
    • 8 kHz to 768 kHz
  • Programmable channel settings:
    • Digital volume control: –100 dB to 27 dB
    • Gain calibration: 0.1-dB resolution
    • Phase calibration: 163-ns resolution
  • Microphone bias or supply voltage generation
  • Voice activity detection (VAD)
  • Low-latency signal processing filter selection
  • Programmable HPF and biquad digital filters
  • I2C control
  • Integrated high-performance audio PLL
  • Automatic clock divider setting configurations
  • Audio serial data interface:
    • Format: TDM, I2S, or left-justified (LJ)
    • Word length: 16 bits, 20 bits, 24 bits, or 32 bits
    • Master or slave interface
  • Single-supply operation: 3.3 V or 1.8 V
  • I/O-supply operation: 3.3 V or 1.8 V
  • Power consumption for 1.8-V supply:
    • 2.8mW/channel at 16-kHz sample rate
    • 3.6 mW/channel at 48-kHz sample rate
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The PCMD3140 is a high-performance, pulse-density-modulation (PDM) input to time-division multiplexing (TDM) or I2S output converter that supports simultaneous sampling of up to four digital channels for the PDM microphone input. The device integrates programable digital volume control, a microphone bias voltage, a phase-locked loop (PLL), a programmable high-pass filter (HPF), biquad filters, low-latency filter modes, and allows for output sample rates up to 768 kHz. The device supports time-division multiplexing (TDM), I2S, or left-justified (LJ) audio formats, and can be controlled with the I2C interface. Additionally, the PCMD3140 supports master and slave mode selection for the audio bus interface operation. These integrated high-performance features, along with the ability to be powered from a single-supply of 3.3 V or 1.8 V, make the device an excellent choice for space-constrained audio systems in far-field microphone recording applications.

The PCMD3140 is specified from –40°C to +125°C, and is offered in a 20-pin WQFN package.

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Technical documentation

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Type Title Date
* Data sheet PCMD3140 Quad-Channel, PDM Input to TDM or I2S Output Converter datasheet (Rev. A) Jun. 25, 2021
User guide ADCx120EVM-PDK, PCMD3140EVM-PDK Evaluation Module User's Guide (Rev. A) Jun. 21, 2021
Application note Dynamic Performance Testing of Digital Audio D/A Converters Oct. 02, 2000

Design & development

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Hardware development

document-generic User guide

The PCMD3140 evaluation module (EVM) performance demonstration kit (PDK) allows the user to test the capabilities of the PCMD3140. PCMD3140 is a high-performance, pulse-density modulation (PDM) input to time-division multiplexing (TDM) or inter-IC sound (I2S) output converter that supports (...)

  • Complete evaluation kit for PCMD3140
  • Onboard digital 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 (...)

Software development

PCMD31xx ADC family Linux driver support
PCMD31XX-DRIVERS — These Linux drivers support our low-power audio analog-to-digital converters (ADCs) in the PCMD31xx device family, and include both .c and .h files. The "Go to third party" buttons below will allow you to downlod the appropriate drivers from

Linux main line status
Available in Linux (...)
SBAC292.ZIP (89 KB)

Design tools & simulation

SBAM453.ZIP (67 KB) - IBIS Model
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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
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