MSM7620 datasheet, PDF - EEWORLD Datasheet

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MSM7620: DescriptionEcho Canceler; File Size213KB，28 Pages; ManufacturerOKI; Websitehttp://www.oki.com

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Echo Canceler

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E2U0038-28-81

¡ Semiconductor

MSM7620

¡ Semiconductor

Echo Canceler

This version: Aug. 1998

MSM7620

Previous version: Nov. 1996

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.

Used as a line echo canceler, the device cancels the line echo impedance mismatching in a hybrid.

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

MSM7602 is provided with a howling detect control pin. In addition, the MSM7602, while having

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

: 30 dB (typ.)

• Clock frequency

: 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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MSM7620 Related Products

	MSM7620	MSM7620-001GS-K	MSM7620-011GS-BK
Description	Echo Canceler	Echo Canceler	Echo Canceler
Maker	-	OKI	OKI
Parts packaging code	-	SSOP	QFP
package instruction	-	SSOP,	QFP,
Contacts	-	32	64
Reach Compliance Code	-	unknow	unknow
JESD-30 code	-	S-PDSO-G32	S-PQFP-G64
length	-	14 mm	14 mm
Number of functions	-	1	1
Number of terminals	-	32	64
Maximum operating temperature	-	85 °C	85 °C
Minimum operating temperature	-	-40 °C	-40 °C
Package body material	-	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	-	SSOP	QFP
Package shape	-	SQUARE	SQUARE
Package form	-	SMALL OUTLINE, SHRINK PITCH	FLATPACK
Certification status	-	Not Qualified	Not Qualified
Maximum seat height	-	2.4 mm	2.4 mm
Nominal supply voltage	-	5 V	5 V
surface mount	-	YES	YES
technology	-	CMOS	CMOS
Telecom integrated circuit types	-	ISDN ECHO CANCELLER	ISDN ECHO CANCELLER
Temperature level	-	INDUSTRIAL	INDUSTRIAL
Terminal form	-	GULL WING	GULL WING
Terminal pitch	-	0.8 mm	0.8 mm
Terminal location	-	DUAL	QUAD
width	-	14 mm	14 mm

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