The PCMD3140 is a high-performance, low-power, flexible, 4-channel, pulse-density-modulation (PDM) input to time-division multiplexing (TDM) or I²S audio output converter with extensive feature integration. This device is intended for applications in voice-activated systems, portable computing, communication, and entertainment applications. The low power consumption makes this device suitable for battery-powered, portable audio systems. This device integrates a host of features that reduces cost, board space, and power consumption in space-constrained, battery-powered, consumer, home, and industrial applications.

The PCMD3140 consists of the following blocks:

• Four-channel, pulse density modulation (PDM) digital microphone interface with high-performance decimation filter
• Low-noise, microphone bias output to power the digital microphone
• Programmable decimation filters with linear-phase or low-latency filter
• Programmable digital volume control, biquad filters for each channel
• Programmable phase and gain calibration with fine resolution for each channel
• Programmable high-pass filter (HPF), and digital channel mixer
• Integrated low-jitter phase-locked loop (PLL) supporting a wide range of system clocks
• Integrated digital and analog voltage regulators to support single-supply operation

Communication to the PCMD3140 to configure the control registers is supported using an I²C interface. The device supports a highly flexible audio serial interface [time-division multiplexing (TDM), I²S, or left-justified (LJ)] to transmit audio data seamlessly in the system across devices.

The device can support multiple devices by sharing the common TDM buses across devices. Moreover, the device includes a daisy-chain feature as well. These features relax the shared TDM bus timing requirements and board design complexities when operating multiple devices for applications requiring high audio data bandwidth.

Table 7-1 lists the reference abbreviations used throughout this document to registers that control the device.