Texas Instruments Introduces New High-performance Stereo Channel 32-bit Audio ADCs

Texas Instruments introduced a high-performance, Burr-Brown™ audio analog-to-digital converter (ADC) PCM182x that supports simultaneous sampling of up to two analog channels. The device supports differential line and microphone inputs with a 2-V_RMS full-scale signal. The device integrates a phase-locked loop (PLL), a DC removal high-pass filter (HPF), and supports sample rates up to 192 kHz. The device supports time-division multiplexing (TDM) or I²S audio formats, selectable with the hardware pin level. Additionally, the PCM182x 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, make the device an excellent choice for cost-sensitive, space-constrained audio systems in far-field microphone recording applications.

The PCM182x is specified from –40 °C to +125 °C, and is offered in a 20-pin WQFN package.

Features

• Stereo high-performance ADC:
  • 2-channel analog microphones or line-in
• ADC line and microphone differential input performance:
  • PCM1820 dynamic range:
    • 123-dB, dynamic range enhancer enabled
    • 113-dB, dynamic range enhancer disabled
  • PCM1821 dynamic range: 106 dB
  • THD+N: –95 dB
• ADC differential 2-V_RMS full-scale input
• ADC sample rate (f_S) = 8 kHz to 192 kHz
• Hardware pin control configurations
• Linear-phase or low-latency filter selection
• Flexible audio serial data interface:
  • Master or slave interface selection
  • 32-bits, 2-channel TDM
  • 32-bits, 2-channel I²S
• Automatic power-down upon loss of audio clocks
• Integrated high-performance audio PLL
• Single-supply operation: 3.3 V
• I/O-supply operation: 3.3 V or 1.8 V
• Power consumption for 3.3-V AVDD supply:
  • 19.6 mW/channel at 16-kHz sample rate
  • 21.3 mW/channel at 48-kHz sample rate

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The PCM1820EVM Evaluation Module.