STA321 datasheet(64/157 Pages) STMICROELECTRONICS

部件名	STA321

功能描述	4-channel digital audio system with FFX??driver

PDF	157 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

64 / 157 page

ADC

STA321

64/157

Doc ID 15351 Rev 3

ADC

10.1

Description

The STA321 analog input is provided through a low-power, low-voltage complete low-cost

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

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

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

DC-removal filter.

The ADC works with either a microphone input or a line input, selected using bit

ADC_INSEL in register ADCCFG0 on page 133.

A programmable gain amplifier (PGA) is available in microphone-in mode giving the

possibility to amplify the signal from 0 to 42 dB in steps of 6 dB using register bit

ADCCFG0.ADC_PGA.

The ADC specifications are given in Table 6 on page 14.

Figure 39.

ADC front-end block diagram

ADC left

INL 2

PGA

INR 2

INR 1

PGA

ADC right

ADCINSEL[4]

INL 1

ADCCFG1[7:6]

16 bits

STA321 数据表(PDF) 64 Page - STMicroelectronics