MC145442B

•MC145443B

MOTOROLA

2

BLOCK DIAGRAM

* Refer to the FB pin description.

15

16

RxA2

RxA1

LB

MODE

SQT

TxD

TLA

Xout

Xin

9

8

20

11

14

13

2

MODE

CONTROL

MODULATOR

OSCILLATOR

CLOCK

DIVIDER

SAMPLING CLOCK: 77.82 kHz

SAMPLING CLOCK: 19.46 kHz

INTERNAL

VAG

ANALOG

GROUND

GENERATOR

12

6

19

VAG

AAF

S/H

LOW–BAND

BPF

HIGH–BAND

BPF

AC AMP

*

SMOOTHING

FILTER

18

17

ExI

TxA

1

10

DSI

FB

DEMOD

5

RxD

3

CARRIER

DETECT

CD

CDA

CDT

7

4

VDD

VSS

+

–

+

–

Rating

Symbol

Value

Unit

Supply Voltage

VDD

–0.5 to 7.0

V

DC Input Voltage

Vin

–0.5 to VDD + 0.5

V

DC Output Voltage

Vout

–0.5 to VDD + 0.5

V

Clamp Diode Current, per Pin

IIK, IOK

±20

mA

DC Output Current, per Pin

Iout

±28

mA

Power Dissipation

PD

500

mW

Operating Temperature Range

TA

–40 to 85

°C

Storage Temperature Range

Tstg

–65 to 150

°C

RECOMMENDED OPERATING CONDITIONS

Parameter

Symbol

Min

Max

Unit

Supply Voltage

VDD

4.5

5.5

V

DC Input or Output Voltage

Vin, Vout

0

VDD

V

Input Rise or Fall Time

tr, tf

—

500

ns

Crystal Frequency*

fcrystal

3.2

5.0

MHz

* Changing the crystal frequency from 3.579 MHz will change the output frequencies. The

change in output frequency will be proportional to the change in crystal frequency.

This device contains circuitry to protect the

inputs against damage due to high static volt-

ages or electric fields; however, it is advised that

normal precautions be taken to avoid application

of any voltage higher than maximum rated

voltages to this high impedance circuit. For

proper operation it is recommended that Vin and

Vout be constrained to the range VSS ≤ (Vin or

Vout) ≤ VDD).

Unused inputs must always be tied to an

appropriate logic voltage level (e.g., either VSS

or VDD).