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MSM7512BGS-K

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

Oki Electric Industry 

Semiconductor

MSM7512B

AC Characteristics

Modulator/analog output (AO) characteristics

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

Parameter

Symbol

Condition

Min. Typ. Max. Unit

FSK Transmit

fDM

XD = "1"

1200 bps Transmit Mode

fDS

XD = "0"

Signal Frequency

fBM

75 bps Transmit Mode

XD = "1"

fBS

XD = "0"

FSK Transmit Signal

VAO1

Answer Tone amplitude VAO2

AOG = "0"

VO

AOG = "1"

Analog External

VEA1

Input Signal Gain

VEA2

VAO – VEAI

AOG = "0"

AOG = "1"

FSK Transmit

1296

2096

386

446

–6

–12

–2

–8

1300

2100

390

450

–4

–10

0

–6

1304 Hz

2104 Hz

394 Hz

454 Hz

–2 dBm

–8 dBm

2 dB

–4 dB

Signal Amplitude

Ratio

VAOD

VAO(MARK) – VAO(SPACE)

–2

0

2 dB

Out-of-band

Energy

4 kHz to 8 kHz —

— P–20 dB

VSPS

P : In-band Signal

Energy

8 kHz to 12 kHz —

— P–40 dB

More than12 kHz —

— P–60 dB

Output Offset Voltage

VOFF

Output Load Resistance RAO

To VDD/2

—

–150 — +150 mV

600

—

—W

* 0 dBm = 0.775 Vrms

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