Datasheet > MSM7620

MSM7620

更新时间： 2022-11-25 14:58:09

品牌	Logo	应用领域
冲电气 - OKI		/
页数	文件大小	规格书
28页	223K
描述
Echo Canceler

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数据手册

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MSM7620 数据手册

E2U0038-28-81

This version: Aug. 1998

Previous version: Nov. 1996

¡ Semiconductor

MSM7620

¡ Semiconductor

MSM7620

Echo Canceler

GENERAL DESCRIPTION

The MSM7620 is an improved version of the MSM7520 with the same basic configuration. The

MSM7620 includes following improvements: a modified through mode, timing control of the

control pin input, and a thinner package. The MSM7620 also provides a pin-for-pin replacement

with the MSM7520.

The MSM7620 is a low-power CMOS IC device for canceling echo (in an acoustic system or

telephone line) generated in a speech path.

Echo is canceled (in digital signal processing) by estimating the echo path and generating a

pseudo-echo signal.

Used as an acoustic echo canceler, the MSM7620 cancels the acoustic echo between the loud

speaker and the microphone which occurs during hands free communication, such as on a car

phone or a conference system phone.

Usedasalineechocanceler, thedevicecancelsthelineechoimpedancemismatchinginahybrid.

In addition, a quality conversation is made possible by controlling the level and preventing

howling with a howling detector, double talk detector, attenuation function and a gain control

function, and by controlling the low level noise with a center clipping function.

The MSM7620 I/O interface supports m-law PCM. The use of a single chip CODEC, such as the

MSM7543, allows the configuration an economic and efficient echo canceler to be configured.

Note: If the object is to cancel line echo, the use of the MSM7602 is recommended, for the

MSM7602isprovidedwithahowlingdetectcontrolpin. Inaddition,theMSM7602,whilehaving

characteristics equivalent to the MSM7620, is packaged small.

FEATURES

• Handles both acoustic echoes and telephone line echoes.

• Cancelable echo delay time:

MSM7620-001................. For a single chip: 23 ms (max.)

MSM7620-011................. For a cascade connection (can also be used for a single chip)

Master chip: 23 ms (max.)

Slave chip: 31 ms (max.)

Cancelable up to 213 ms (one master plus six slaves)

For a single chip: 23 ms (max.)

• Echo attenuation

• Clock frequency

: 30 dB (typ.)

: 18 MHz (36 MHz cannot be used)

External input and internal oscillator circuit are provided.

• Power supply voltage : 5 V (4.5 V to 5.5 V)

• Power consumption

: 150 mW (typ.) When powered down: 20 mW (typ.)

• Package options:

32-pin plastic SSOP (SSOP32-P-640-0.80-K) (Product name : MSM7620-001GS-K)

64-pin plastic QFP (QFP64-P-1414-0.80-BK) (Product name : MSM7620-011GS-BK)

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与MSM7620相关器件

型号	品牌	描述	获取价格	数据表
MSM7620-001GS-K	OKI	Echo Canceler	获取价格
MSM7620-011GS-BK	OKI	Echo Canceler	获取价格
MSM7630	OKI	Universal Speech Processor	获取价格
MSM7650	OKI	NTSC/PAL Digital Encoder	获取价格
MSM7650GS-BK	OKI	Color Signal Encoder, PQFP80, PLASTIC, QFP-80	获取价格
MSM7652	OKI	NTSC/PAL Digital Video Encoder	获取价格