CA3089
®
Data Sheet
October 2002
FN0561.4
FM IF System
Features
.
Description
• For FM IF Amplifier Applications in High-Fidelity,
Automotive, and Communications Receivers
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.
• 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)
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.
• Single-Coil Tuning Capability
• High Recovered Audio . . . . . . . . . . . . . . . . . .400mV (Typ)
• Provides Specific Signal for Control of Interchannel Muting
(Squelch)
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.
• 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
Part Number Information
PART
NUMBER
TEMP. RANGE
o
( C)
PACKAGE
16 Ld PDIP
20 Ld SOIC
PKG. NO.
E16.3
CA3089E
-40 to 85
-40 to 85
CA3089M1
(3089M)
M20.3
Pinouts
CA3089
(PDIP)
CA3089
(SOIC)
TOP VIEW
TOP VIEW
1
2
3
4
5
6
7
8
9
GND
GND
IF IN
20
19
IF IN
1
2
3
4
5
6
7
8
16 NC
DELAYED AGC
INPUT BYPASS
DC FB BYPASS
FRAME GND
MUTE CONTROL
AUDIO OUT
AFC OUT
15 DELAYED AGC
14 SUBSTRATE (GND)
13 TUNING METER OUT
12 MUTE LOGIC
11 V+
INPUT BYPASS
DC FB BYPASS
FRAME GND
MUTE CONTROL
AUDIO OUT
AFC OUT
18 GND
17 SUBSTRATE (GND)
16 TUNING METER OUT
15 MUTE LOGIC
14 V+
13 REF BIAS
10 REF BIAS
IF OUT
12
QUADRATURE INPUT
9
QUADRATURE INPUT
IF OUT
GND 10
11 NC
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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1
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