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MSM7510GS-K

300 bps Full Duplex FSK Modem – ITU-T V.21

Oki Electric Industry 

Semiconductor

MSM7510

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

Answer Tone Detect

(CD) Freq.

Answer Tone Detect,

Non-Detect Amplitude

(CD)

Input Resistance

Symbol

VAI

VON

VOFF

VHYS

tCDD

tCDH

DBS

fASR

VAON

FAOF

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

FSK Signal, at AI

OFF Æ ON

—

— –42 dBm

I/O Alternative Pattern OFF Æ OFF –48

—

— dBm

VON Æ VOFF

—

2

— dB

See Fig. 1

5

15

20 ms

FSK Signal, Answer Tone

20

40

60 ms

300 bps, I/O Alternative Pattern

–10

—

10 %

2100 Hz

Detect, at AI

Non-Detect, at AI

AI

EAI

–20

—

20 Hz

–46

—

–6

dB

—

— –60

—

10

— MW

20

—

— kW

* 0 dBm = 0.775 Vrms

AI

CD

tCDD

tCDH

Figure 1 Carrier Detect (CD) Timing

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