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PCMD3140 Datasheet(PDF) 92 Page - Texas Instruments |
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PCMD3140 Datasheet(HTML) 92 Page - Texas Instruments |
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92 / 106 page  8 Application and Implementation Note Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes, as well as validating and testing their design implementation to confirm system functionality. 8.1 Application Information The PCMD3140 is a multichannel, pulse-density-modulation (PDM) input to time-division multiplexing (TDM) or I2S audio output converter that supports output sample rates of up to 768 kHz. The device supports up to four digital pulse density modulation (PDM) microphones for simultaneous recording applications. Communication to the PCMD3140 for configuration of the control registers is supported using an I2C interface. The device supports a highly flexible, audio serial interface (TDM, I2S, and LJ) to transmit audio data seamlessly in the system across devices. 8.2 Typical Application 8.2.1 Four-Channel Digital PDM Microphone Recording Figure 8-1 shows a typical configuration of the PCMD3140 for an application using four digital PDM MEMS microphones with simultaneous recording operation using an I2C control interface and the TDM audio data slave interface. If the MICBIAS output is not used in the system then the 1-µF capacitor for the MICBIAS pin is not used. 3.3 V (3.0 V to 3.6 V) OR 1.8 V (1.65 V to 1.95 V) 0.1 F PCMD314 0 DMIC1 DOUT CLK VDD VSS GND PDMDIN2_GPI2 Host Pro cessor R R SEL Rterm PDMDIN1_GPI1 PDMCL K1_GPO1 Rterm VDD GND GND 10 F 1 F GND VDD (3.0 V to 3.6 V) Thermal Pad (VSS) GND DRE G GND IOVDD GND 10 F 10 F 0.1 F DMIC2 DOUT CLK VDD VSS GND SEL VDD Rterm 0.1 F DMIC3 DOUT CLK VDD VSS GND SEL Rterm VDD 0.1 F DMIC4 DOUT CLK VDD VSS GND SEL VDD Rterm Figure 8-1. Four-Channel Digital PDM Microphone Recording Diagram PCMD3140 SBASA64A – DECEMBER 2020 – REVISED JUNE 2021 www.ti.com 92 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: PCMD3140 |
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