CA3089
November 1996
FM IF System
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.
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 . . . . . . . . . . . . . . . . . . . . . . . . . . 12µV (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
Ordering Information
PART NUMBER
(BRAND)
CA3089E
CA3089M1
(3089M)
TEMP.
RANGE (
o
C)
-40 to 85
-40 to 85
PACKAGE
16 Ld PDIP
20 Ld SOIC
PKG.
NO.
E16.3
M20.3
Pinout
CA3089
(PDIP)
TOP VIEW
GND
IF IN 1
INPUT BYPASS 2
DC FB BYPASS 3
FRAME GND 4
MUTE CONTROL 5
AUDIO OUT 6
AFC OUT 7
IF OUT 8
16 NC
15 DELAYED AGC
14 SUBSTRATE (GND)
13 TUNING METER OUT
12 MUTE LOGIC
11 V+
10 REF BIAS
9 QUADRATURE INPUT
IF IN
INPUT BYPASS
DC FB BYPASS
FRAME GND
MUTE CONTROL
AUDIO OUT
AFC OUT
IF OUT
1
2
3
4
5
6
7
8
9
CA3089
(SOIC)
TOP VIEW
20 GND
19 DELAYED AGC
18 GND
17 SUBSTRATE (GND)
16 TUNING METER OUT
15 MUTE LOGIC
14 V+
13 REF BIAS
12 QUADRATURE INPUT
11 NC
GND 10
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
File Number
561.3
8-27
INTERSIL [ INTERSIL CORPORATION ]
