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MSM7512

1200 bps Half Duplex FSK Modem – ITU-T V.23

Oki Electric Industry 

Semiconductor

MSM7512B

Demodulator analog input (Al, EAI) characteristics

Parameter

Receive Signal

Amplitude

Receive Signal

Detect Amplitude (CD)

Hysteresis (CD)

CD Delay Time

CD Hold Time

Receive Data (RD)

Bias Distortion

Input Resistance

Symbol

VAI

VON

VOFF

VHYS

tCDD

tCDH

DBS

RAI

REAI

( VDD = +2.7 V to +5.5 V, Top = –40°C to +85°C)

Condition

Min. Typ. Max. Unit

FSK Signal, at AI

—

—

–6 dBm

OFF Æ ON —

— –42 dBm

FSK Signal, (1:1) at AI

OFF Æ OFF –48

—

— dBm

VON Æ VOFF

—

2

— dB

See Fig. 1

5

15

20 ms

20

40

60 ms

1200 bps, 1:1 Pattern

–10

—

10 %

AI

—

10

— MW

EAI

20

—

— kW

* 0 dBm = 0.775 Vrms

AI

CD

tCDD

tCDH

Figure 1 Carrier Detect (CD) Timing

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