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Texas Instruments PCM3120-Q1 Software-Controlled Audio ADC

Texas Instruments PCM3120-Q1 Software-Controlled Audio ADC is a Burr-Brown™ high-performance, audio analog-to-digital converter (ADC) that supplies simultaneous sampling of up to two analog channels or four digital channels for the pulse density modulation (PDM) microphone input.

The TI PCM3120-Q1 Software-Controlled Audio ADC implements line and microphone inputs for single-ended and differential input configurations. The ADC integrates programmable channel gain, digital volume control, a programmable microphone bias voltage, a phase-locked loop (PLL), a programmable high-pass filter (HPF), biquad filters, and low-latency filter modes while permitting sample rates up to 768kHz.

The ADC supports time-division multiplexing (TDM), I²S, or left-justified (LJ) audio formats and can be controlled with the I²C interface. These integrated high-performance features, combined with the ability to be powered from a single supply of 3.3V or 1.8V, make the device an ideal choice for space-constrained audio systems in far-field microphone recording applications.

The PCM3120-Q1 is specified from -40°C to +125°C and is housed in a 20-pin WQFN package.

Features

Multichannel high-performance ADC:
- 2-channel analog microphones or line-in
- 4-channel digital PDM microphones
- Up to 2x analog and up to 2x digital microphone channels
ADC line and microphone differential input performance:
- 106dB Dynamic range (DR)
- -95dB THD+N
ADC channel summing mode, DR performance 109dB, 2-channel summing
ADC input voltage:
- Differential, 2V_RMS full-scale inputs
- Single-ended, 1V_RMS full-scale inputs
ADC sample rate (f_S) = 8kHz to 768kHz
Programmable channel settings:
- 0dB to 42dB, 0.5dB steps Channel gain
- –100dB to 27dB Digital volume control
- Gain calibration with 0.1dB resolution
- Phase calibration with 163ns resolution

Programmable microphone bias or supply voltage generation
Low-latency signal processing filter selection
Programmable HPF and biquad digital filters
Automatic gain controller (AGC)
Voice activity detection (VAD)
I²C control interface
Integrated high-performance audio PLL
Automatic clock divider setting configurations
Audio serial data interface:
- TDM, I²S, or left-justified (LJ) format
- 16 bits, 20 bits, 24 bits, or 32 bits word length
- Master or slave interface
3.3V or 1.8V Single-supply operation
3.3V or 1.8V I/O-supply operation
Power consumption for 1.8V AVDD supply of 9.5mW/channel at 48kHz sample rate

Applications

Automotive active noise cancellation
Automotive head unit
Rear seat entertainment

Digital cockpit processing unit
Telematics control unit

Texas Instruments PCM3120-Q1 Software-Controlled Audio ADC

Features

Applications

Simplified Block Diagram

Functional Block Diagram

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