1 Features

1• Multichannel high-performance ADC:

– 4-channel analog microphones or line-in

• ADC line and microphone differential input

performance:

– Dynamic range:

– 123-dB, dynamic range enhancer enabled

– 113-dB, dynamic range enhancer disabled

– THD+N: –98 dB

• ADC differential 2-VRMS full-scale input

• 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:

– Master or slave 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 2.75-V output

• 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:

– 17.0 mW/channel at 16-kHz sample rate

– 18.4 mW/channel at 48-kHz sample rate

2 Applications

• Smart speakers

• DVD recorders and players

• AV receivers

• Video conference systems

• IP network cameras

3 Description

The PCM1840 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 2-VRMS 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 192 kHz. The device

supports time-division multiplexing (TDM), I2S, or leftjustified

(LJ) audio formats, selectable with the

hardware pin level. Additionally, the PCM1840

supports master and slave mode selection for the

audio bus interface operation. These integrated highperformance

features, along with the ability to be

powered from a single supply of 3.3 V, make the

device an excellent choice for cost-sensitive, spaceconstrained

audio systems in far-field microphone

recording applications.

The PCM1840 is specified from –40°C to +125°C,

and is offered in a 24-pin WQFN package.