ADAU1961WBCPZ-R7 datasheet(21/73 Pages) AD

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Data Sheet

ADAU1961

THEORY OF OPERATION

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Rev. B | 21 of 73

The ADAU1961 is a low power audio codec that offers high quality

audio, low power, small size, and many advanced features. The

stereo ADC and stereo DAC each have an SNR of at least +98

dB and a THD + N of at least −90 dB. The serial data port is

compatible with I2S, left-justified, right-justified, and TDM modes for

interfacing to digital audio data. The operating voltage is 3.3 V, with

an on-board regulator generating the internal digital supply voltage.

The record signal path includes very flexible input configurations

that can accept differential and single-ended analog microphone

inputs as well as a digital microphone input. A microphone bias

pin provides seamless interfacing to electret microphones. Input

configurations can accept up to six single-ended analog signals or

variations of stereo differential or stereo single-ended signals with

two additional auxiliary single-ended inputs. Each input signal has

its own programmable gain amplifier (PGA) for volume adjustment

and can be routed directly to the playback path output mixers,

bypassing the ADCs. An automatic level control (ALC) can also be

implemented to keep the recording volume constant.

The ADCs and DACs are high quality, 24-bit Σ-Δ converters that

operate at selectable 64× or 128× oversampling ratios. The base

sampling rate of the converters is set by the input clock rate and

can be further scaled with the converter control register settings.

The converters can operate at sampling frequencies from 8 kHz

to 96 kHz. The ADCs and DACs also include very fine-step digital

volume controls.

The playback path allows input signals and DAC outputs to be

mixed into various output configurations. Headphone drivers are

available for a stereo headphone output, and the other output pins

are capable of differentially driving an earpiece speaker. Capless

headphone outputs are possible with the use of the mono output

as a virtual ground connection. The stereo line outputs can be used

as either single-ended or differential outputs and as an optional

mix-down mono output.

The ADAU1961 can generate its internal clocks from a wide range

of input clocks by using the on-board fractional PLL. The PLL

accepts inputs from 8 MHz to 27 MHz.

The ADAU1961 is provided in a small, 32-lead, 5 mm × 5 mm

LFCSP with an exposed bottom pad.

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