PCMD3140

• 4-channel PDM microphones simultaneous conversion
• PDM input to TDM or I²S output converter performance:
  • 127-dB dynamic range (DR) with high-performance, 5th-order PDM input
  • 117-dB dynamic range (DR) with high-performance, 4th-order PDM input
• Channel summing mode, DR performance with high-performance, 4th-order PDM input:
  • 120-dB, 2-channel summing
• Programmable PDM clock output:
  • 768 kHz to 6.144 MHz
• Programmable output sample rate (f_S):
  • 8 kHz to 768 kHz
• Programmable channel settings:
  • Digital volume control: –100 dB to 27 dB
  • Gain calibration: 0.1-dB resolution
  • Phase calibration: 163-ns resolution
• Microphone bias or supply voltage generation
• Voice activity detection (VAD)
• Low-latency signal processing filter selection
• Programmable HPF and biquad digital filters
• I²C control
• 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 supply:
  • 2.8mW/channel at 16-kHz sample rate
  • 3.6 mW/channel at 48-kHz sample rate

The PCMD3140 is a high-performance, pulse-density-modulation (PDM) input to time-division multiplexing (TDM) or I²S output converter that supports simultaneous sampling of up to four digital channels for the PDM microphone input. The device integrates programable digital volume control, a microphone bias voltage, a phase-locked loop (PLL), a programmable high-pass filter (HPF), biquad filters, low-latency filter modes, and allows for output sample rates up to 768 kHz. The device supports time-division multiplexing (TDM), I²S, or left-justified (LJ) audio formats, and can be controlled with the I²C interface. Additionally, the PCMD3140 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 or 1.8 V, make the device an excellent choice for space-constrained audio systems in far-field microphone recording applications.

The PCMD3140 is specified from –40°C to +125°C, and is offered in a 20-pin WQFN package.