May 1999
T
UCT
ROD ACEMEN 47
P
LETE
2-77
EPL
BSO NDED R 1-800-44
O
ME
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COM pplicatio @harris
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CA2111A
FM IF Ampli鏗乪r-Limiter
and Quadrature Detector
[ /Title
(CA21
11A)
/Sub-
ject
(FM
IF
Ampli-
鏗乪r-
Limiter
and
Quadra
ture
Detec-
tor)
/Autho
r ()
/Key-
words
(Har-
ris
Semi-
con-
ductor,
FM IF
ampli-
鏗乪r,
quadrat
ure
detec-
tor,
lim-
iter,
TV
audio
IF,
high
AM
rejec-
tion,
Features
鈥?Input Limiting Voltage At 10.7MHz . . . . . . . . . . . 400碌V
鈥?Input Limiting Voltage At 4.5, 5.5MHz . . . . . . . . 250碌V
鈥?Typical AM Rejection At 10.7MHz. . . . . . . . . . . . . 45dB
鈥?Provision for Output from 3-Stage IF Ampli鏗乪r Section
鈥?Low Harmonic Distortion
鈥?Quadrature Detection Permits Simpli鏗乪d Single-Coil
Tuning
鈥?Extremely Low AFC Voltage Drift Over Full Operating
Temperature Range
鈥?Minimum Number of External Components Required
Description
The CA2111A provides a multistage wideband ampli鏗乪r-
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 ampli鏗乪r-
limiter as a straight 60dB wideband ampli鏗乪r.
The ampli鏗乪r-limiter features the excellent limiting character-
istic of 3 cascaded differential ampli鏗乪rs. 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.
Part Number Information
Applications
鈥?FM IF Sound
鈥?TV Sound IF
PART NUMBER
CA2111AE
TEMP.
RANGE (
o
C)
-40 to 85
PACKAGE
14 Ld PDIP
PKG.
NO.
E14.3
Pinout
CA2111A
(PDIP)
TOP VIEW
AUDIO OUT 1
REF BIAS 2
NC 3
IF IN 4
DC FB BYPASS 5
INPUT BYPASS 6
GROUND 7
14 DE-EMPHASIS
13 V+
12 QUADRATURE INPUT
11 QUADRATURE IN BUF
10 HIGH IF OUTPUT
9 LOW IF OUTPUT
8 NC
Block Diagram
L
1
V+
+12V
13
4
51鈩?/div>
6
0.1碌F
0.1碌F
5
BIAS
EMITTER
FOLLOWER
1
3
AMPLIFIER-
LIMITER
QUADRATURE
DETECTOR
14碌H
3pF
C
1
9
12
120pF
2
10
11
14
8
0.003碌F
7
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright
漏
Harris Corporation 1999
File Number
612.2
8-13
INTERSIL
1
2
3
4
5
