Packaging information
| Package | Pins WQFN (RTE) | 20 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 3,000 | LARGE T&R |
Features for the 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 (fS):
- 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
Description for the PCMD3140
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.