MSM7603 データシートの表示（PDF） - Oki Electric Industry

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MSM7603

Echo Canceler

Oki Electric Industry 

¡ Semiconductor

MSM7603/7603B

ECHO CANCELER CHARACTERISTICS DIAGRAM

(for m-law and A-law, and for reference only)

E. R. L. vs. echo attenuation

40

RIN input level vs. echo attenuation

40

30

30

20

20

10

10

0

0

40 30 20 10 0 –10

E. R. L. [dB]

–50 –40 –30 –20 –10 0

RIN input level [dBm0]

Measurement Conditions :

RIN input = –10 dBm0 5 kHz band white noise

Echo delay time TD = 50 ms

ATT, GC, NLP = OFF

Power supply voltage 5 V

Measurement Conditions :

RIN input: 5 kHz band white noise

Echo delay time TD = 50 ms

E.R.L. = 6 dB

ATT, GC, NLP = OFF

Power supply voltage 5 V

Echo delay time vs. echo attenuation

30

20

10

0

0 10 20 30 40 50

Echo delay time [ms]

Measurement Conditions :

RIN input = –10 dBm

5 kHz band white noise

E.R.L. = 6 dB

ATT, GC, NLP = OFF

Power supply voltage 5 V

Note:

Above characteristics are for the MSM7533 (VDD 5 V, m-law CODEC interface). For the

MSM7704 (VDD 3 V, m-law interface) the characteristics are basically the same except

for input and output levels. Refer to the PCM CODEC data sheet.

MSM7533 (for both transmit and receive)

0 dBm0 = 0.85 Vrms = 0.8 dBm (600 W)

MSM7704 (for transmit side)

0 dBm0 = 0.35 Vrms = –6.9 dBm (600 W)

(for receive side)

0 dBm0 = 0.5 Vrms = –3.8 dBm (600 W)

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