ml7021 Oki Semiconductor, ml7021 Datasheet

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ml7021

Manufacturer Part Number
ml7021
Description
Echo Canceler
Manufacturer
Oki Semiconductor
Datasheet

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OKI Semiconductor
ML7021
Echo Canceler
GENERAL DESCRIPTION
The ML7021 is an improved version of the MSM7602 with the reduced cancelable echo delay
time and additional 2100Hz tone detection function.
The ML7021 is a low-power CMOS 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.
The ML7021 makes possible a quality conversation by controlling the noise level and preventing
howling with howling detector, double talk detector, attenuation function, and a gain control
function. The devise also controls the low level noise with a center clipping function.
Further, the ML7021 I/O interface supports -law PCM . The use of a single chip CODEC, such
as the MSM7566/7704 (3 V) or MSM7543/7533 (5 V), allows a simplified and efficient echo
canceler configuration.
FEATURES
• Tone disable function
• Cancelable echo delay time:
• Echo attenuation
• Clock frequency
• Power supply voltage : 2.7 V to 5.5 V
• Package:
For a single chip: 8 ms (max.)
28-pin plastic SSOP
(SSOP28-P-485-0.65-K)
: 30 dB (typ.)
: 19.2 MHz
External input and internal oscillator circuit are provided.
(Product name : ML7021MB)
Issue Date: Jun. 1, 2005
FEDL7021-03
1

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ml7021 Summary of contents

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... The devise also controls the low level noise with a center clipping function. Further, the ML7021 I/O interface supports -law PCM . The use of a single chip CODEC, such as the MSM7566/7704 ( MSM7543/7533 (5 V), allows a simplified and efficient echo canceler configuration ...

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... SD t — — — — — — DRS t — — 52 DRE t 100 — — DIT ML7021 (Ta = –40˚C to +85˚ Unit Min. Typ. Max. — 19.2 — MHz 17.5 — 20 — 52.08 — — 57.14 40 — 20.8 — ...

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... Therefore, before you perform reflow mounting, contact Oki’s responsible sales person for the product name, package name, pin number, package code and desired mounting conditions (reflow method, temperature and times). Package material Epoxy resin Lead frame material 42 alloy Pin treatment Solder plating ( 5 m) Package weight (g) 0.39 TYP. Rev. No./Last Revised 3/Dec. 5, 1996 ML7021 (Unit : mm) 22 ...

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... REVISION HISTORY Document No. Date FEDL7021-02 Nov. 2001 FEDL7021-03 Jun. 1, 2005 Page Previous Current Edition Edition – – Final edition 2 Revised Max. values of “Sync Timing” and 10 10 “Sync Signal Width” in the Table in the “AC Characteristics” Section. ML7021 Description 23 ...

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... The purchaser assumes the responsibility of determining the legality of export of these products and will take appropriate and necessary steps at their own expense for these part of the contents contained herein may be reprinted or reproduced without our prior permission. Copyright 2005 Oki Electric Industry Co., Ltd. ML7021 24 ...

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