OKI MSM7512B Technical data

E2A0014-16-X0

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Semiconductor MSM7512B

¡ Semiconductor

This version: Jan. 1998

Previous version: Nov. 1996

MSM7512B

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

GENERAL DESCRIPTION

The MSM7512B is useful for the ITU-T V.23 modem, for examples, low cost built-in modems,
telecontrol systems, home security systems, etc.
The family version, MSM7510 for ITU-T V.21, will be available following this device.
Oki has been mass-producing and delivering the MSM6926 and 6927 for a long time, but these
devices need two power supplies, +5 V for digital and +12 V for analog.
New generation devices, MSM7510/7512B, work with single rail +3 V to +5 V and low power

consumption.

FEATURES

• Conforms to ITU-T V.23, 1200 bps Half Duplex

• Conforms to ITU-T V.23, 75 bps transmitter

• Single Power Supply: +3 V to +5 V

• Low Power Consumption
Operating Mode: 25 mW Typ.
Power Down Mode: 0.1 mW Max.

• Line Hybrid Circuit on Chip

• Line Direct Drive Capability of Analog Output

• 3.579545 MHz Crystal Oscillator

• Digital Interface: TTL

• Package options:
16-pin plastic DIP (DIP16-P-300–2.54) (Product name: MSM7512BRS)
24-pin plastic SOP (SOP24-P-430-1.27–K) (Product name: MSM7512BGS-K)

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Semiconductor MSM7512B

BLOCK DIAGRAM

AI

(2)

AO
(3)

EAI

(4)

X1
(6)

X2
(7)

CLK

(8)

V

DD

(1)

GND

(5)

*R1

OSC

+

–

*R1

*R2

*R2

–

+

CLK GEN.

SG GEN.

AOG

*R3

*R2

* R1 to R3 ≥ 50 kW

FSK & ANS

Bandpass

Filter

Demodulator

Modulator

CONT.

RD
(9)

CD

(10)

XD

(11)

RS

(12)

TEST

(13)

MOD1

(14)

MOD2

(15)

AOG

(16)

( ) : for MSM7512BRS

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Semiconductor MSM7512B

PIN CONFIGURATION (TOP VIEW)

1

DD

2

AI

3

AO

4

EAI

5

GND

6

X1

7

X2

8 9

CLK

16-Pin Plastic DIP

16V

15

14

13

12

11

10

AOG

MOD2

MOD1

TEST

RS

XD

CD

RD

1

DD

2

NC

3

AI

4

NC

5

AO

6

EAI

7

GND

8

X1

9

NC

10

X2

11

NC

12 13

CLK

24-Pin Plastic SOP

NC : No connect pin

24V

23

22

21

20

19

18

17

16

15

14

AOG

NC

MOD2

NC

MOD1

TEST

RS

XD

NC

CD

NC

RD

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Semiconductor MSM7512B

PIN DESCRIPTION

No.

RS GS-VK

11 VDD— +3 V to +5 V Power Supply

2 3 AI I Analog receive signal input.

3 5 AO O Analog transmit signal output.

External analog signal input.

4 6 EAI I

5 7 GND — Ground, 0 V.

6 8 X1 I

710 X2 O

8 12 CLK O 3.579545 MHz clock signal output.

913 RD O

10 15 CD O

11 17 XD I*

12 18 RS I*

13 19 TEST I*

14 20 MOD1 I* Operation mode select.

15 22 MOD2 I*

16 24 AOG I*

The signal applied to this pin is transmitted from AO via transmit output

amplifier. When not using this pin, it should be left open.

3.579545 MHz crystal resonator should be connected to X1 and X2.

When applying external clock 3.579545 MHz to the device, it should be

applied to X2 (not X1) via an AC-coupling capacitor of 100 pF and X1

has to be opened.

Modem receive serial data output.

Digital "1" and "0" correspond to "Mark" and "Space", respectively. When
CD (Carrier Detect) is off, RD is held at "Mark" state.

FSK Receive signal and answer tone detect.

Digital "0" and "1" represent "Detect" and "Non-detect", respectively.

Modem transmit serial data input.

Digital "1" and "0" correspond to "Mark" and "Space", respectively.

FSK signal and answer tone transmit enable.
When digital "0" is applied to RS, transmitting becomes enable.

Chip test input.
TEST should be open or digital "1".

Refer to Table 1.

Analog transmit signal amplitude select.

Digital "1" Æ –10 dBm Typ. at AO

Digital "0" Æ –4 dBm Typ. at AO

DescriptionName I/O

Note : I* : Internally pulled-up input pin.

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