Texas Instruments TLV320ADCx140 Audio Analog-to-Digital Converter

Texas Instruments TLV320ADCx140 4-ch, 768kHz Audio Analog-to-Digital Converter (ADC) supports simultaneous sampling of up to four analog or eight digital channels for the pulse density modulation (PDM) microphone input. The TLV320ADCx140 supports line and microphone inputs, allowing for single-ended and differential input configurations.

The TLV320ADCx140 integrates programmable channel gain, digital volume control, a programmable microphone bias voltage, a phase-locked loop (PLL), a programmable high-pass filter (HPF), bi-quad filters, low-latency filter modes. It allows for sample rates up to 768kHz. The device also supports time-division multiplexing (TDM), I²S, or left-justified (LJ) audio formats and can be controlled with the I²C or SPI interface.

The Texas Instruments TLV320ADCx140 offers high-performance features and the ability to be powered from a single supply of 3.3V or 1.8V. The TLV320ADCx140 Audio ADC is an excellent choice for space-constrained audio systems in far-field microphone recording applications. The TLV320ADCx140 is specified from -40°C to +125°C and is offered in a 24-pin WQFN package.

Features

Multichannel high-performance ADC
- 4-channel analog microphones or line-in,
- 8-channel digital PDM microphones, or
- Combination of analog and digital microphones
ADC line and microphone differential input performance
- Dynamic range (DR)
  - 123dB, dynamic range enhancer (DRE) enabled
  - 113dB, DRE disabled
- THD+N: –98dB
ADC channel summing mode, DR performance
- 116dB, DRE disabled, 2-ch summing
- 119dB, DRE disabled, 4-ch 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:
- Channel gain: 0dB to 42dB, 1dB steps
- Digital volume control: –100dB to 27dB
- 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 bi-quad digital filters
Automatic gain controller (AGC)
I²C or SPI controls
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: 3.3V or 1.8V
I/O-supply operation: 3.3V or 1.8V
Power consumption for 1.8V AVDD supply
- 8.5mW/channel at 16kHz sample rate
- 9.2mW/channel at 48kHz sample rate