ML7021 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

ML7021

Single Rail CODEC

Oki Electric Industry 

¡ Semiconductor

ML7021

ECHO CANCELER CHARACTERISTIC DIAGRAM

ERL 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

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

Echo delay time vs. echo attenuation

40

30

20

10

0

–50 –40 –30 –20 –10 0

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

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

0

2

4

6

8 10

Echo delay time [ms]

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)

17

Share Link: