Datasheet > ML7021MB

ML7021MB

更新时间： 2024-02-06 07:57:49

品牌	Logo	应用领域
冲电气 - OKI		电信综合业务数字网光电二极管电信集成电路
页数	文件大小	规格书
24页	244K
描述
ISDN Echo Canceller, 1-Func, CMOS, PDSO28, 0.485 INCH, 0.65 MM PITCH, PLASTIC, SSOP-28

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ML7021MB 技术参数

生命周期：	Transferred	零件包装代码：	SSOP
包装说明：	SSOP,	针数：	28
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.32	JESD-30 代码：	R-PDSO-G28
长度：	10.5 mm	功能数量：	1
端子数量：	28	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SSOP	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, SHRINK PITCH	认证状态：	Not Qualified
座面最大高度：	2.25 mm	标称供电电压：	3.3 V
表面贴装：	YES	技术：	CMOS
电信集成电路类型：	ISDN ECHO CANCELLER	温度等级：	INDUSTRIAL
端子形式：	GULL WING	端子节距：	0.65 mm
端子位置：	DUAL	宽度：	9.5 mm
Base Number Matches：	1

ML7021MB 数据手册

¡ Semiconductor

ML7021

EXPLANATION OF TERMS

Attenuating Function :

Echo Attenuation :

This function prevents howling and controls the noise level with

the attenuator for the RIN input and SOUT output. Refer to the

explanation of pins (ATT pin).

If there is talking (input only to RIN) in the path of a rising echo

arises, the echo attenuation refers to the difference in the echo

return loss (canceled amount) when the echo canceler is not used

and when it is used.

Echo attenuation = (SOUT level during through mode operation)

– (SOUT level during echo canceler operation) [dB]

This is the time from when the signal is output from ROUT until

it returns to SIN as an echo.

When using a hands free phone, and so on, the signal output from

the speaker echoes and is input again to the microphone. The

return signal is referred to as acoustic echo.

Echo Delay Time :

Acoustic Echo :

Telephone Line Echo :

Gain Control Function :

This is a signal which is delayed midway in a telephone line and

returns as an echo, due to reasons such as a hybrid impedance

mismatch.

This function prevents howling and controls the sound level with

againcontrollerfortheRINinput. Refertotheexplanationofpins

(GC pin).

Center Clipping Function : This function forces the SOUT output to a minimum value when

the signal is below –54 dBm0. Refer to the explanation of pins

(NLP pin).

Double Talk Detection :

Double talk refers to a state in which the SIN and RIN signals are

input simultaneously. In a double talk state, a signal outside the

echo signal which is to be canceled can be input to the SIN input,

resulting in misoperation.

Thedoubletalkdetectorpreventssuchmisoperationofthecanceler.

Thisistheoscillatingstatecausedbytheacousticcouplingbetween

the loud speaker and the microphone during hands free talking.

Howling not only interferes with talking, but can also cause in

misoperation of the echo canceler.

Howling Detection :

The howling detector prevents such misoperation and prevents

howling.

Echo Return Loss (ERL) :

WhenthesignaloutputfromROUTreturnstoSINasanecho, ERL

refers to how much loss there is in the signal level during ROUT.

ERL = (ROUT level) – (SIN level of the ROUT signal which returns

as an echo) [dB]

If ERL is positive (ROUT > SIN), the system is an attenuator

system.

IfERLisnegative(ROUT<SIN),thesystemisanamplifiersystem.

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