MSM6889RS データシートの表示（PDF） - Oki Electric Industry

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MSM6889RS

Multi-Function Telecommunication LSI

Oki Electric Industry 

¡ Semiconductor

MSM6889

PIN DESCRIPTION

Pin Number

Name

I/O

RS

GS

Description

+5 V Power Supply (Analog Circuit).

When power is turned on or the power down mode is released, the

1

35

VA

—

device must be put into the PB tone transmit mode or PB tone

detect mode.

2

37

GAR

O Output, non-inverting input and inverting input pins of on-chip

3

39

AIN+

I

operational amplifier.

4

40

AIN–

I

No hybrid transformer is required by use of these pins. (See Fig. 2.)

Analog signal output.

5

41

AO

O

PB tone or modem transmit signal is output from this pin.

6

43

SG

O On-chip signal ground, having a potential of about +2.5 V.

7

44

GAT1

I

PB is the PB tone output and MOD is the modem signal output.

8

45

GAT2

O By connecting external resistors to GAT1 and GAT2 pins, signal level can

9

46

MOD

O be set at required values for the modem signal and

10

47

PB

O the PB tone that are output from AO, independently. (See Fig. 3.)

These pins are used to externally adjust the received carrier

11

50

VR1

O detect(CD) signal level.

The potential of VR1 to SG is about +1.1 V. The carrier

detect level can be set at the required value by a on-chip resistor

12

51

VR2

I

divider between VR1 and SG. The given potential to VR2 is set

about +0.88 V with high resistance inside the IC. (See Fig. 4.)

13

52

AG

— Analog Ground, 0 V.

14

53

PBG1

I*

Inputs used to specify PB tone to be sent.

15

54

PBG2

I*

PB1 to PB4 can be connected externally like 4-bit bus line. Data is

16

56

PBG3

I*

latched at the falling edge of TEN. (See Fig. 7 and Fig. 8.)

17

2

PBG4

I*

* Digital input pulled up by a high resistance inside the IC.

5/21

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