STA529Q datasheet(25/57 Pages) STMICROELECTRONICS

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STA529

ADC

Doc ID 13095 Rev 3

25/57

ADC

7.1

ADC performance values

7.2

Functional description

The STA529 analog input is provided through a low-power, low-voltage, 16-bit stereo audio

analog-to-digital converter front end designed for audio applications. It includes a

programmable gain amplifier, anti-aliasing filter, low-noise microphone biasing circuit,

third-order MASH2-1 delta-sigma modulator, digital decimating filter and a first-order

DC-removal filter.

The ADC works in the microphone input (mic-in) mode and in the line-input mode. If the line

input mode is selected, the ADC is configured in stereo and all conversion channels are

active.

If the microphone input mode is selected, the ADC is configured in mono. The mono

channel is routed through the left conversion path, and the right conversion path is kept in

power-down mode to minimize power consumption. A programmable gain amplifier (PGA) is

available in mic-in mode, making it possible to amplify the signal from 0 to +42 dB in steps of

6dB.

Table 16.

Programmable gain performance

Parameter

Min

Typ

Max

Unit

Dynamic range 1 kHz, A-weighted (3.3 V supply)

Dynamic range 1 kHz, A-weighted (1.8 V supply)

SNDR 1 kHz, A-weighted (3.3 V supply)

SNDR 1 kHz, A-weighted (1.8 V supply)

THD 1 kHz (-1 dB input) (3.3 V supply)

-85

THD 1 kHz (-1 dB input) (1.8 V supply)

-75

Cross talk (3.3 V supply)

-80

Cross talk (1.8 V supply)

-60

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