• Multichannel high-performance ADC:
  • 2-channel analog microphones or line-in
  • 4-channel digital PDM microphones
  • Up to 2 analog and up to 2 digital microphone channels
• ADC line and microphone differential input performance:
  • Dynamic range (DR): 106 dB
  • THD+N: –95 dB
• ADC channel summing mode, DR performance:
  • 109-dB, 2-channel summing
• ADC input voltage:
  • Differential, 2-V_RMS full-scale inputs
  • Single-ended, 1-V_RMS full-scale inputs
• ADC sample rate (f_S) = 8 kHz to 768 kHz
• Programmable channel settings:
  • Channel gain: 0 dB to 42 dB, 0.5-dB steps
  • Digital volume control: –100 dB to 27 dB
  • Gain calibration with 0.1-dB resolution
  • Phase calibration with 163-ns 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:
  • 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 AVDD supply:
  • 9.5 mW/channel at 48-kHz sample rate

• Smart speakers
• IP network cameras
• Professional microphones and wireless systems
• Video conference systems

The TLV320ADC3120 is a Burr-Brown™ high-performance, audio analog-to-digital converter (ADC) that supports simultaneous sampling of up to two analog channels or four digital channels for the pulse density modulation (PDM) microphone input. The device supports line and microphone inputs, and allows for both single-ended and differential input configurations. The device 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, low-latency filter modes, and allows for sample rates up to 768 kHz, and allows for sample rates up to 192 kHz. The device 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, 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 TLV320ADC3120 is specified from –40°C to +125°C, and is offered in a 20-pin WQFN package.

Simplified Block Diagram