Datasheet > CA3224E_02

CA3224E_02

更新时间： 2024-01-26 03:07:42

品牌	Logo	应用领域
英特矽尔 - INTERSIL		/
页数	文件大小	规格书
6页	162K
描述
Automatic Picture Tube Bias Control Circuit

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CA3224E_02 数据手册

CA3224E

Data Sheet

October 2002

FN1553.2

Automatic Picture Tube Bias Control

Circuit

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

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

• Wide Dynamic Range

• Three-Gun Control

• Minimal External Components

Part Number Information

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.

PART

NUMBER

TEMP. RANGE

( C)

PACKAGE

PKG. NO.

CA3224E

-40 to 85

22 Ld PDIP

E22.4

Pinout

CA3224E

(PDIP)

TOP VIEW

GROUND

CHANNEL 1 INPUT

CHANNEL 1 HOLD CAP

CHANNEL 1 OUTPUT

CHANNEL 2 HOLD CAP

CHANNEL 2 OUTPUT

CHANNEL 3 HOLD CAP

CHANNEL 3 OUTPUT

CHANNEL 1 FREQ COMPENSATION

CHANNEL 2 INPUT

CHANNEL 2 FREQ COMPENSATION

CHANNEL 3 INPUT

CHANNEL 3 FREQ COMPENSATION

VERTICAL INPUT

BYPASS

REF

AUTO BIAS LEVEL ADJUST

GROUND

HORIZONTAL INPUT

AUTO BIAS PULSE OUTPUT

PROGRAM PULSE OUTPUT

GRID PULSE OUTPUT

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.

All other trademarks mentioned are the property of their respective owners.

12 3 4 5 6

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