Datasheet > AD74122

AD74122

更新时间： 2024-01-07 00:44:10

品牌	Logo	应用领域
其他 - ETC		解码器编解码器
页数	文件大小	规格书
18页	346K
描述
AD74122: Low Cost. Low Power Stereo Audio Codec Preliminary Data Sheet (Rev. PrG. 1/03)

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AD74122 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
零件包装代码：	TSSOP	包装说明：	TSSOP-20
针数：	20	Reach Compliance Code：	not_compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.92	Is Samacsys：	N
商用集成电路类型：	CONSUMER CIRCUIT	JESD-30 代码：	R-PDSO-G20
JESD-609代码：	e0	长度：	6.5 mm
湿度敏感等级：	1	功能数量：	1
端子数量：	20	最高工作温度：	105 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装等效代码：	TSSOP20,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	240	电源：	2.5,3.3 V
认证状态：	Not Qualified	座面最大高度：	1.1 mm
子类别：	Other Consumer ICs	最大供电电压 (Vsup)：	2.75 V
最小供电电压 (Vsup)：	2.375 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Tin/Lead (Sn85Pb15)
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	4.4 mm	Base Number Matches：	1

AD74122 数据手册

PRELIMINARY TECHNICAL DATA

Low Cost, Low Power

Preliminary Technical Data

Stereo Audio Codec

AD74122

GENERAL DESCRIPTION

FEATURES

2.5V Stereo Audio Codec with 3.3 V Tolerant Digital Inter-

face

The AD74122 is a front-end processor for general purpose

audio and voice applications. It features two multi-bit Σ∆ A/D

conversion channels and two multi-bit Σ∆ D/A conversion chan-

nels. The ADC channels provide >70 dB SNR and the DAC

channels provide >80dB SNR both over an audio signal band-

width.

Supports 8kHz to 48 kHz Sample Rates

Supports 16/20/24-Bit Word Lengths

Multibit Sigma Delta Modulators with

“Perfect Differential Linearity Restoration” for

Reduced Idle Tones and Noise Floor

Data Directed Scrambling DACs - Least Sensitive to Jitter

Performance (20 Hz to 20 kHz)

The AD74122 is particularly suitable for a variety of applica-

tions where stereo input and output channels are required,

including audio sections of Digital Video Camcorders, portable

personal audio devices and telematic applications. Its high qual-

ity performance also make it suitable for speech and telephony

applications such as speech recognition and synthesis and mod-

ern feature phones.

85 dB ADC Dynamic Range

93 dB DAC Dynamic Range

Digitally Programmable Input/Output Gain

On-chip Volume Controls Per Output Channel

Software Controllable Clickless Mute

Supports 256xFs, 512xF_sand 768xFs Master Mode Clocks

Master Clock Pre-Scaler for use with DSP master clocks

On-Chip Reference

An on-chip reference voltage is included but can be

overdriven by an external reference source if required.

The AD74122 offers sampling rates which, depending on

MCLK selection and MCLK divider ratio, range from 8 kHz in

the voiceband range to 48 kHz in the audio range.

20-Lead TSSOP Package

APPLICATIONS

The AD74122 is available in 20 lead TSSOP package option

and is specified for the automotive temperature range of -40°C

to +105°C.

Digital Video Camcorders (DVC)

Portable Audio Devices (Walkman, PDAs etc.)

Audio Processing

Voice Processing

Telematic Systems

General Purpose Analog I/O

FUNCTIONAL BLOCK DIAGRAM

RESET

MCLK

DVDD1

DVDD2

AVDD

LEFT ADC

CAPPL

DIN

DOUT

DFS

DIGITAL

FILTER

Σ−∆ ADC

MODULATOR

Gain

Stage

VINL

SERIAL

DATA

PORT

CAPNL

CAPPR

DCLK

RIGHT ADC

DIGITAL

FILTER

Σ−∆ ADC

MODULATOR

Gain

Stage

VINR

CAPNR

LEFT DAC

DIGITAL

FILTER

VOLUME

CONTROL

Σ−∆ DAC

MODULATOR

VOUTL

VOUTR

RIGHT DAC

REFERENCE

DIGITAL

FILTER

VOLUME

CONTROL

Σ−∆ DAC

MODULATOR

AGND

DGND

REFCAP

REV. PrG 1/03

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

Analog Devices, Inc., 2003

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