1 Features

• Multichannel high-performance ADC:

– 4-channel analog microphones or line-in

• ADC line and microphone differential input

performance:

– Dynamic range:

• 123dB, dynamic range enhancer enabled

• 113dB, dynamic range enhancer disabled

– THD+N: –98dB

• ADC differential 2VRMS full-scale input

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

• Hardware pin control configurations

• Linear-phase or low-latency filter selection

• Flexible audio serial data interface:

– Controller or target interface selection

– 32-bits, 4-channel TDM

– 32-bits, 2-channel TDM

– 32-bits, 2-channel I2S

– 32-bits, 2-channel left-justified (LJ)

• Automatic power-down upon loss of audio clocks

• Integrated high-performance audio PLL

• Low-noise MICBIAS 2.75V output

• Single-supply operation: 3.3V

• I/O-supply operation: 3.3V or 1.8V

• Power consumption for 3.3V AVDD supply:

– 17.0 mW/channel at 16kHz sample rate

– 18.4 mW/channel at 48kHz sample rate

2 Applications

• Telematics control unit

• Automotive head unit

• Digital cockpit processing unit

• Automotive display module

3 Description

The PCM1841-Q1 is a high-performance, Burr-

Brown™ audio analog-to-digital converter (ADC) that

supports simultaneous sampling of up to four analog

channels. The device supports differential line and

microphone inputs with a 2VRMS full-scale signal.

The device integrates microphone bias voltage, 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),

I2S, or left-justified (LJ) audio formats, selectable with

the hardware pin level. Additionally, the PCM1841-

Q1 supports controller and target 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 3.3V, make the

device an excellent choice for cost-sensitive, spaceconstrained

audio systems in far-field microphone

recording applications.

The PCM1841-Q1 is specified from –40°C to +125°C

and is offered in a 24-pin VQFN package.