MSM7715 Просмотр технического описания (PDF) - Oki Electric Industry

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MSM7715

Multi-Function Telecommunication LSI

Oki Electric Industry 

¡ Semiconductor

MSM7715

Name Pin No. I/O

Description

VDD

29

— Power supply. Supply +2.5V to 3.6V.

AIN

31

I Input for the analog receiving signal.

SGO

32

O

Output for the signal ground voltage. The output voltage is 1/2 VDD.

Connect a capacitor of 0.1 mF or more between SGO and GND.

SGC

GAT1

GAT2

MOD

DTO

34

—

Pin for connecting the capacitor of the signal ground voltage generating circuit.

Connect a capacitor of 1 mF or more between SGC and GND.

35

I Input for the sending output level-adjusting amplifier.

36

O Output for the sending output level-adjusting amplifier.

37

O Output for the sending modem signal.

38

O Output for the DTMF signal.

VR1

VR2

GND

DTG1

DTG2

DTG3

39

O

Output for the reference voltage generating circuit.

The potential difference between VR1 and SGO is approximately +0.75 V.

40

I Input for external adjustment of the modem’s carrier detection level.

41

— Ground.

42

Inputs for specifying the DTMF code to be sent.

43

I* Data is latched at the falling edge of TEN.

44

Note: Digital inputs that are pulled up internally by a high resistance.

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