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MSM7557

Single Chip MSK Modem with Compandor for Cordless Telephone

Oki Electric Industry 

¡ Semiconductor

MSM7557

Voice Signal Interfaces

DYN = "0" : VDD = 2.7 V to 5.5 V, Ta = –30°C to 70°C

DYN = "1" : VDD = 4.5 V to 5.5 V, Ta = –30°C to 70°C

Parameter

Symbol

Condition

Min.

Typ. Max. Unit

RVO Maximum Output

fIN = 1 kHz

DYN = "0"

—

—

–6

Signal Level

VOUT BYP = "0" *1 DYN = "1"

—

—

+2

dBV

fIN = 1 kHz

DYN = "0"

–10

–9

–8

Limiter Clamp Level

VLIM LIM = open

DYN = "1"

–2

–1

0

Transmit Output Distortion HDT fIN = 1 kHz, –12 dBV

—

–40

—

Receive Output Distortion HDR BYP = "0", EMP = "1"

—

–40

—

Transmit Gain

GT fIN = 1 kHz, BYP = EMP = "1" –1.5

–0.2

+1

dB

Receive Gain

GR fIN = 1 kHz, BYP = EMP = "1" –1.5

–0.2

+1

Transmit Idle Noise

HIT BYP = "0"

—

–51

—

Receive Idle Noise

HIR EMP = "1"

RCV.ÆTran.

Cross Talk

CTT RAIO = –2 dBV

*2

Tran.ÆRCV.

CTR TVIO = –2 dBV

—

–85

—

dBV

—

–75

–60

—

–80

–60

Transmit Filter

Response

Receive Filter

Response

FT1

FT3

FT25

FT34

FT60

FR1

FR3

FR25

FR34

FR60

EMP = "1"

BYP = "1"

RCK2 = "0"

Ref. = 1 kHz

EMP = "1"

BYP = "1"

RCK2 = "0"

Ref. = 1 kHz

100 Hz

—

–28

–23

300 Hz –12.5

–10.5

–8.5

2.5 kHz +6.5

+8.0

+9.5

3.4 kHz +8.5

+10.5 +12.5

6 kHz

—

–40

–30

100 Hz +1.5

+3.0

+4.5

dB

300 Hz +8.0

+9.5

+11.0

2.5 kHz –9.5

–8.0

–6.5

3.4 kHz –12.5

–10.5

–8.5

6 kHz

—

–40

–30

*1 S/D ≥ 20 dB

*2 fIN = 1 kHz, BYP = EMP = "1"

13/25

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