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¡ Semiconductor

ML7021

ECHO CANCELER CHARACTERISTIC DIAGRAM

ERL vs. echo attenuation

ERL [dB]

Measurement Conditions

RIN input = –10 dBm

5 kHz band white noise

(0 dBm = 2.2 dBm0)

Echo delay time TD = 8 ms

ATT, GC, NLP = OFF

Power supply voltage 5 V

–50 –40 –30 –20 –10

RIN input level vs. echo attenuation

RIN input level [dBm]

0 dBm = 2.2 dBm0

Measurement Conditions

RIN input: 5 kHz band white noise

Echo delay time TD = 8 ms

ERL = 6 dB

ATT, GC, NLP = OFF

Power supply voltage 5 V

Echo delay time vs. echo attenuation

Echo delay time [ms]

Measurement Conditions

RIN input = –10 dBm

5 kHz band white noise

(0 dBm = 2.2 dBm0)

ERL = 6 dB

ATT, GC, NLP = OFF

Power supply voltage 5 V

–10

Note:

The characteristics above are for the MSM7543 (VDD 5 V, m-law interface). The

MSM7566 (VDD 3 V, m-law interface) provides the same characleristics without input

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

MSM7543

(for both transmit and receive)

0 dBm0 = 0.6007 Vrms = –2.2 dBm (600 W)

MSM7566

(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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