描述 Description

The TSDP18xx is an ultra low-power, high-performance, 8 channel PDM to Linear PCM converter. It supports Digital MEMS Microphone (DMIC) over sample rates up to 6.144MHz; and output sampling rates of 8KHz up to 384KHz enabling support for Ultrasonic capable DMICs.
TSDP18xx supports 2 channel I2S or Left-Justified (LJ) format output as well as up to 8 channels using the Time-Division Multiplexed (TDM) format. The device enables a wide variety of configurations 32-bit, 24-bit or 16-bit word lengths, clock polarity inversion, and more to maximize compatibility with almost any DSP, Audio Processor, Codec or SOC.
The supplied DMIC sources are driven by a configurable PDM clock ranging from 256kHz up to 6.144MHz, while the digital audio interface operates in slave mode with the supplied SCLK signal ranging from 2MHz up to 49.152MHz, and a LRCLK input providing a frame signal matched to the format, I2S or TDM.
There is a wide range of support for SCLK to LRCLK / FRMCLK ratios ranging from 32Fs to 512Fs.
Configuration of the FIR and decimation filter coefficients are based on combination of SCLK to LRCLK / FRMCLK ratio and the three OS_MODE pins which impact the Oversampling Mode, supporting 8x to 256x.