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What is CA3224E?

This electronic component, produced by the manufacturer "Intersil Corporation", performs the same function as "Automatic Picture Tube Bias Control Circuit".


CA3224E Datasheet PDF - Intersil Corporation

Part Number CA3224E
Description Automatic Picture Tube Bias Control Circuit
Manufacturers Intersil Corporation　
Logo Intersil Corporation Logo　


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®
NO RECOOBMSOMDLaEEtNaTDESEhPDeRReOtEDPULCATCEMENT
October 2002
CA3224E
FN1553.2
Automatic Picture Tube Bias Control
Circuit
Description
The CA3224E is an automatic picture tube bias control cir-
cuit used in color TV receiver CRT drive circuits. It is used to
provide dynamic bias control of the grey scale both initially
and over the CRT operating life, compensating for CRT cut-
off changes.
The CA3224E provides automatic continuous control of the
cutoff current in each gun of a three-gun color CRT. From an
input pulse amplitude proportional to the difference between
the desired and the actual CRT cutoff, a gated sample/hold
circuit generates a DC correction voltage which correctly
biases the CRT driver circuit. The sample/hold bias
correction takes place each frame following the vertical
blanking. Figure 1 shows a block diagram of the CA3224E.
The functions include three identical servo loop
transconductance amplifiers with a sample/hold switch and
buffer amplifier plus control logic, internal bias and a mode.
Features
• Automatic Picture Tube Bias Cutoff Control
• Automatic Background Color Balance
• Eliminates Grey Scale Adjustments
• Compensates for Cathode-to-Heater Leakage
• Electrostatic Protection on All Pins
• Servo Loop Design
• Wide Dynamic Range
• Three-Gun Control
• Minimal External Components
Part Number Information
PART
NUMBER
TEMP. RANGE
(oC) PACKAGE PKG. NO.
CA3224E
-40 to 85 22 Ld PDIP E22.4
Pinout
CA3224E
(PDIP)
TOP VIEW
GROUND
CHANNEL 1 INPUT
CHANNEL 1 FREQ COMPENSATION
CHANNEL 2 INPUT
CHANNEL 2 FREQ COMPENSATION
CHANNEL 3 INPUT
CHANNEL 3 FREQ COMPENSATION
VERTICAL INPUT
GROUND
HORIZONTAL INPUT
GRID PULSE OUTPUT
1
2
3
4
5
6
7
8
9
10
11
22 VCC
21 CHANNEL 1 HOLD CAP
20 CHANNEL 1 OUTPUT
19 CHANNEL 2 HOLD CAP
18 CHANNEL 2 OUTPUT
17 CHANNEL 3 HOLD CAP
16 CHANNEL 3 OUTPUT
15 VREF BYPASS
14 AUTO BIAS LEVEL ADJUST
13 AUTO BIAS PULSE OUTPUT
12 PROGRAM PULSE OUTPUT
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2002. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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CA3224E equivalent
CA3224E
+230V
12K
2.2K
R
G
TO R
R DRIVER
CHROMA/
LUMA
2.7K
CIRCUIT G
BIAS
5K
B 20K
TO B
DRIVER
9.1K
-24V
PROGRAM
RGB TO
BLACK LEVEL
+12V
RFB
160K
2.7K
B
Q1
CATH
SG
DRIVE
RIN
RS
560Ω
1% SUMMING POINT
200Ω VS
0.12
C1
Q2
BIAS
R2
62K
1% BIN
TO RCH
D1
R1
39K TO BCH
1%
AUTO-BIAS PULSE
0.047
CC
GIN
0.047
0.047
+10V
+
33µF
3.9K
1.5K
+10V
10K
+ 10µF
1 21
Q3
2 20
ROUT
GRID PULSE
AMPLIFIER
INVERTER
3 19
4 18
5 17
CA224E
6 16
7 15
+ 10µF
C2
GOUT GIN
+ 10µF
+ BOUT
47µF
20K
12 14
22 10
98
13 11
AUTO BIAS
LEVEL ADJUST
HORIZONTAL
INPUT
VERTICAL
INPUT
NOTE:
3. One of three identical driver circuits shown.
FIGURE 4. TYPICAL APPLICATION CIRCUIT
ICATHODE
(mA)
A
B
0
SET-UP
SENSE
VCATHODE GRID (V)
FIGURE 5. PICTURE TUBE V-I CURVE
Electrostatic Protection (Note)
When correctly designed for ESD protection, SCRs can be
highly effective, enabling circuits to be protected to well in
excess of 4kV. The SCR ESD-EOS protection structures
used on each terminal of the CA3224E are shown
schematically in either Figures 6A or 6B. Although ESD-EOS
protection is included in the CA3224E, proper circuit board
layout and grounding techniques should be observed.
NOTE: For further information on CA3224E protection structures re-
fer to: AN7304, “Using SCRs as Transient Protection Structures in In-
tegrated Circuits”, by L.R. Avery.
TO ACTIVE
CIRCUIT
RSENSE
TO ACTIVE
CIRCUIT
RHOLD
SUBSTRATE
POSITIVE
NEG. TRANSIENT TRANSIENT
PROTECT (A) PROTECT
FIGURE 6A.
5
RHOLD
NEGATIVE
POSITIVE
TRANSIENT TRANSIENT
PROTECT (B) PROTECT
FIGURE 6. TRANSIENT PROTECTION
FIGURE 6B.


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for CA3224E electronic component.


Information Total 6 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
CA3224EThe function is Automatic Picture Tube Bias Control Circuit. Intersil CorporationIntersil Corporation

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