
8-13
May 1999
CA2111A
FM IF Amplifier-Limiter
and Quadrature Detector
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
Harris Corporation 1999
File Number
612.2
Features
Input Limiting Voltage At 10.7MHz . . . . . . . . . . . 400
μ
V
Input Limiting Voltage At 4.5, 5.5MHz . . . . . . . . 250
μ
V
Typical AM Rejection At 10.7MHz. . . . . . . . . . . . . 45dB
Provision for Output from 3-Stage IF Amplifier Section
Low Harmonic Distortion
Quadrature Detection Permits Simplified Single-Coil
Tuning
Extremely Low AFC Voltage Drift Over Full Operating
Temperature Range
Minimum Number of External Components Required
Applications
FM IF Sound
TV Sound IF
Description
The CA2111A provides a multistage wideband amplifier-
limiter, a quadrature detector, and an emitter-follower output
stage. This device is designed for use in FM receivers and in
the sound IF sections of TV receivers. In addition, an output
terminal is provided which allows the use of the amplifier-
limiter as a straight 60dB wideband amplifier.
The amplifier-limiter features the excellent limiting character-
istic of 3 cascaded differential amplifiers. The quadrature
detector requires only one coil in the associated outboard
circuit and therefore, tuning is a simple procedure.
A unique feature of the CA2111A is its exceptionally low
AFC voltage drift over the full operating-temperature range.
Pinout
CA2111A
(PDIP)
TOP VIEW
Block Diagram
Part Number Information
PART NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG.
NO.
CA2111AE
-40 to 85
14 Ld PDIP
E14.3
AUDIO OUT
REF BIAS
NC
IF IN
DC FB BYPASS
INPUT BYPASS
GROUND
DE-EMPHASIS
V+
QUADRATURE INPUT
QUADRATURE IN BUF
HIGH IF OUTPUT
LOW IF OUTPUT
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
2
3
4
5
6
8
9
10
AMPLIFIER-
LIMITER
QUADRATURE
DETECTOR
13
V+
+12V
11
12
14
EMITTER
FOLLOWER
1
L
1
C
1
120pF
14
μ
H
3pF
0.003
μ
F
0.1
μ
F
0.1
μ
F
51
BIAS
7
[ /Title
(CA21
11A)
/Sub-
ject
(FM
IF
Ampli-
fier-
Limiter
and
Quadra
ture
Detec-
tor)
/Autho
r ()
/Key-
words
(Har-
ris
Semi-
con-
ductor,
FM IF
ampli-
fier,
quadrat
ure
detec-
tor,
lim-
iter,
TV
audio
IF,
high
AM
rejec-
tion,
NO REOBSOLETE PRODUCT
Call or email: centapp@harris.com