TLV320ADC3101 - 92dB SNR Low-Power Stereo ADC With Digital Mic Support and miniDSP

The TLV320ADC3101 device is a low-power, stereo audio analog-to-digital converter (ADC) supporting sampling rates from 8 kHz to 96 kHz with an integrated programmable-gain amplifier providing up to 40-dB analog gain or AGC. A programmable miniDSP is provided for custom audio processing. Front-end input coarse attenuation of 0 dB, –6 dB, or off, is also provided. The inputs are programmable in a combination of single-ended or fully differential configurations. Extensive register-based power control is available via an I²C interface, enabling mono or stereo recording. Low power consumption makes the TLV320ADC3101 ideal for battery-powered portable equipment.

The AGC programs to a wide range of attack (7 ms to 1.4 s) and decay (50 ms to 22.4 s) times. A programmable noise-gate function is included to avoid noise pumping. Low-latency IIR filters optimized for voice and telephony are available, as well as linear-phase FIR filters optimized for audio. Programmable IIR filters are also available and may be used for sound equalization, or to remove noise components. The audio serial bus can be programmed to support I²S, left-justified, right-justified, DSP, PCM, and TDM modes. The audio bus may be operated in either master or slave mode.

A programmable integrated PLL is included for flexible clock generation and provides support for all standard audio rates from a wide range of available MCLKs, varying from 512 kHz to 50 MHz, including the most popular cases of 12-MHz, 13-MHz, 16-MHz, 19.2-MHz, and 19.68-MHz system clocks.

• Stereo Audio ADC
  • 92-dBA Signal-to-Noise Ratio
  • Supports ADC Sample Rates From 8 kHz to
    96 kHz
• Instruction-Programmable Embedded miniDSP
• Flexible Digital Filtering With RAM Programmable
  Coefficient, Instructions, and Built-In Processing
  Blocks
  • Low-Latency IIR Filters for Voice
  • Linear Phase FIR Filters for Audio
  • Additional Programmable IIR Filters for EQ,
    Noise Cancellation or Reduction
  • Up to 128 Programmable ADC Digital Filter
    Coefficients
• Six Audio Inputs With Configurable Automatic
  Gain Control (AGC)
  • Programmable in Single-Ended or Fully
    Differential Configurations
  • Can Be 3-Stated for Easy Interoperability With
    Other Audio ICs
• Low Power Consumption and Extensive Modular
  Power Control:
  • 6-mW Mono Record, 8-kHz
  • 11-mW Stereo Record, 8-kHz
  • 10-mW Mono Record, 48-kHz
  • 17-mW Stereo Record, 48-kHz
• Dual Programmable Microphone Bias
• Programmable PLL for Clock Generation
• I²C Control Bus
• Audio Serial Data Bus Supports I²S, Left/Right-
  Justified, DSP, PCM, and TDM Modes
• Digital Microphone Input Support
• Two GPIOs
• Power Supplies:
  • Analog: 2.6 V to 3.6 V
  • Digital: Core: 1.65 V to 1.95 V,
    I/O: 1.1 V–3.6 V
• 4-mm × 4-mm 24-Pin RGE (VQFN)