1

May 1999

CA3189

FM IF System

Features

• Includes

IF

Amplifier,

Quadrature

Detector,

AF

Preamplifier, and Specific Circuits for AGC, AFC, Tun-

ing Meter, Deviation-Noise Muting, and ON Channel

Detector

• FM

IF

Amplifier

Applications

in

High-Fidelity,

Automotive, and Communications Receivers

• Exceptional Limiting Sensitivity -12

µV (Typ) at -3dB

Point

• Low Distortion -0.1% (Typ) (with Double-Tuned Coil)

• Single-Coil Tuning Capability

• Improved S + N/N Ratio

• Externally Programmable Recovered Audio Level

• Provides Specific Signal for Control of Interchannel

Muting (Squelch)

• Provides Specific Signal for Direct Drive of a Tuning

Meter

• On Channel Step for Search Control

• Provides Programmable AGC Voltage for RF Amplifier

• Provides a Specific Circuit for Flexible Audio Output

• Internal Supply Voltage Regulators

• Externally Programmable “On” Channel Step Width,

and Deviation at Which Muting Occurs

Description

The Harris CA3189E is a monolithic integrated circuit that

provides all the functions of a comprehensive FM-lF system.

The block diagram of the CA3189E includes a three-stage

FM-lF amplifier/limiter configuration with level detectors for

each stage, a doubly-balanced quadrature FM detector and

an audio amplifier that features the optional use of a muting

(squelch) circuit.

The advanced circuit design of the IF system includes desir-

able deluxe features such as programmable delayed AGC

for the RF tuner, an AFC drive circuit, and an output signal to

drive a tuning meter and/or provide stereo switching logic. In

addition, internal power-supply regulators maintain a nearly

constant current drain over the voltage supply range of

+8.5V to +16V.

The CA3189E is ideal for high-fidelity operation. Distortion in

a CA3189E FM-lF System is primarily a function of the

phase linearity characteristic of the outboard detector coil.

The CA3189E has all the features of the CA3089E plus addi-

tions. See CA3189E features compared to the CA3089E in

Table 1.

Pinout

CA3189

(PDIP)

TOP VIEW

Part Number Information

PART NUMBER

TEMP.

PACKAGE

PKG.

NO.

CA3189E

-40 to 85

16 Ld PDIP

E16.3

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

IF IN

INPUT

FRAME

MUTE CONTROL

AUDIO OUT

IF OUT

AFC OUT

DELAYED AGC

SUBSTRATE (GND)

TUNING

MUTE LOGIC

V+

REF BIAS

QUADRATURE

BYPASS

METER OUT

INPUT

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.

1-800-4-HARRIS or 407-727-9207

File Number

1046.4

[ /Title

(CA31

89)

/Sub-

ject

(FM

IF Sys-

tem)

/Autho

r ()

/Key-

words

(Har-

ris

Semi-

con-

ductor,

FM IF

ampli-

fier,

quadrat

ure

detec-

tor,

tuning

meter

out-

put,

lim-

iter,

AFC

circuit,

AGC

cir-

cuit,

mut-

ing cir-

cuit,

indus-

trial

tem-

pera-

OBSOLETE

PRODUCT

POSSIBLE

SUBSTITUTE

PRODUCT

CA3089E