描述 Description

The PCMD3180 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 eight 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 either the I2C or SPI interface. Additionally, the PCMD3180 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 PCMD3180 is specified from –40°C to +125°C, and is offered in a 24-pin WQFN package.

特性 Features

? 8-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
? 123-dB, 4-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 with 0.1-dB resolution
? Phase calibration with 163-ns resolution

? Microphone bias or supply voltage generation
? Low-latency signal processing filter selection
? Programmable HPF and biquad digital filters
? 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: 3.3 V or 1.8 V
? I/O-supply operation: 3.3 V or 1.8 V
? Power consumption for 1.8-V supply:
? 2.9 mW/channel at 16-kHz sample rate
? 2.5 mW/channel at 48-kHz sample rate