描述 Description

The PCM1809 is a low power audio analog-to-digital converter (ADC) that supports simultaneous sampling of up to two analog channels. The device supports single-ended and differential line and microphone inputs with a 2VRMS full-scale differential signal. The device integrates a phase-locked loop (PLL), a DC removal high-pass filter (HPF), and supports sample rates up to 192kHz. The device supports time-division multiplexing (TDM) or I2S audio formats, selectable with the hardware pin level. Additionally, the PCM1809 supports Controller and target mode selection for the audio bus interface operation. These integrated features, along with the ability to be powered from a single supply of 3.3V, make the device an excellent choice for cost-sensitive, space-constrained audio systems in microphone recording applications.

The PCM1809 is specified from –40°C to +105°C, and is offered in a 20-pin WQFN package.

特性 Features

Stereo low power ADC:

2-channel analog microphones or line-in



ADC line and microphone differential and single-ended input performance:

PCM1809 dynamic range:

Differential Input: 104dB

Single-ended Input: 102dB



THD+N: –95 dB



2-VRMS differential full-scale input

Direct Coupling

Wide Input Common Mode support

AC/DC Coupling support



ADC sample rate (fS) = 8 kHz to 192 kHz

Hardware pin control configurations

Linear-phase or low-latency filter selection

Flexible audio serial data interface:

Controller or target interface selection

32-bits, 2-channel TDM

32-bits, 2-channel I2S



Automatic power-down upon loss of audio clocks

Integrated high-performance audio PLL

Single-supply operation: 3.3 V

I/O-supply operation: 3.3 V or 1.8 V

Power consumption for 3.3-V AVDD supply:

19.6 mW/channel at 16-kHz sample rate

21.3 mW/channel at 48-kHz sample rate