Texas Instruments PCM3140-Q1 Audio ADCs

Texas Instruments PCM3140-Q1 Audio ADCs are quad-channel 768kHz Burr-Brown™ audio ADCs with 106dB Signal to Noise Ratio (SNR). These audio ADCs support line and microphone inputs and allow single-ended and differential input configurations. The PCM3140-Q1 ADCs also support simultaneous sampling of up to four analog channels or eight digital channels for the Pulse Density Modulation (PDM) microphone input. These audio ADCs with high-performance features can be powered from a single supply of 3.3V or 1.8V. This makes the device an excellent choice for space-constrained audio systems in far-field microphone recording applications. The PCM3140-Q1 devices are qualified for automotive applications.

The PCM3140-Q1 ADCs integrate programable channel gain, digital volume control, programmable microphone bias voltage, Phase-Locked Loop (PLL), programmable high-pass filter, biquad filters, and low-latency filter modes. These audio ADCs operate at -40°C to 125°C temperature range and come in a 24-pin VQFN package. The PCM3140-Q1 ADCs are ideal for microphone array systems, voice-activated digital assistants, teleconferencing systems, and security and surveillance systems.

Features

Multichannel high-performance ADCs:
- 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:
- 106dB Dynamic Range (DR)
- -98dB THD+N
ADC channel summing mode, DR performance:
- 109dB, 2-channel summing
- 112dB, 4-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 frequency range
Programmable channel settings:
- 0dB to 42dB channel gain, 1dB steps
- -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)
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
- Controller or target interface
3.3V or 1.8V single-supply operation
3.3V or 1.8V I/O-supply operation
Power consumption for 1.8V AV_DD supply:
- 8.5mW/channel at 16kHz sample rate
- 9.2mW/channel at 48kHz sample rate