8-27

November 1996

CA3089

FM IF System

Features

• For FM IF Amplifier Applications in High-Fidelity,

Automotive, and Communications Receivers

• Includes:

IF

Amplifier,

Quadrature

Detector,

AF

Preamplifier, and Specific Circuits for AGC, AFC, Muting

(Squelch), and Tuning Meter

• Exceptional Limiting Sensitivity

at -3dB Point . . . . . . . . . . . . . . . . . . . . . . . . . . 12

µV (Typ)

• Low Distortion:

(with Double-Tuned Coil). . . . . . . . . . . . . . . . 0.1% (Typ)

• Single-Coil Tuning Capability

• High Recovered Audio. . . . . . . . . . . . . . . . 400mV (Typ)

• Provides Specific Signal for Control of Interchannel

Muting (Squelch)

• Provides Specific Signal for Direct Drive of a Tuning

Meter

• Provides Delayed AGC Voltage for RF Amplifier

• Provides a Specific Circuit for Flexible AFC

• Internal Supply-Voltage Regulators

Description

Intersil CA3089 is a monolithic integrated circuit that pro-

vides all the functions of a comprehensive FM-IF system.

The block diagram shows the CA3089 features, which

include a three-stage FM-IF 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 delayed AGC for the RF tuner,

and AFC drive circuit, and an output signal to drive a tuning

meter and/or provide stereo switching logic. In addition, inter-

nal power supply regulators maintain a nearly constant cur-

rent drain over the voltage supply range of +8.5V to +16V.

The CA3089 is ideal for high-fidelity operation. Distortion in a

CA3089 FM-IF System is primarily a function of the phase

linearity characteristic of the outboard detector coil.

Pinout

Ordering Information

PART NUMBER

(BRAND)

TEMP.

PACKAGE

PKG.

NO.

CA3089E

-40 to 85

16 Ld PDIP

E16.3

CA3089M1

(3089M)

-40 to 85

20 Ld SOIC

M20.3

CA3089

(PDIP)

TOP VIEW

CA3089

(SOIC)

TOP VIEW

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

IF IN

INPUT BYPASS

DC FB BYPASS

FRAME GND

MUTE CONTROL

AUDIO OUT

IF OUT

AFC OUT

NC

SUBSTRATE (GND)

TUNING METER OUT

MUTE LOGIC

V+

REF BIAS

QUADRATURE INPUT

DELAYED AGC

11

12

13

14

15

16

17

18

20

19

10

9

8

7

6

5

4

3

2

1

GND

IF IN

INPUT BYPASS

DC FB BYPASS

FRAME GND

MUTE CONTROL

AFC OUT

AUDIO OUT

IF OUT

GND

GND

GND

SUBSTRATE (GND)

TUNING METER OUT

DELAYED AGC

MUTE LOGIC

V+

REF BIAS

QUADRATURE INPUT

NC

File Number

561.3

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

1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999