MC13281BP View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC13281BP

80/100 MHz Video Processor

Motorola => Freescale 

MC13280AY MC13281A/B

FUNCTIONAL DESCRIPTION

The MC13280AY and MC13281A/B are composed of

three video amplifiers, clamping and blanking circuitry with

contrast and subcontrast controls. Each video amplifier is

designed to have a –3.0 dB bandwidth of 100 MHz

(MC13281, 80 MHz for the MC13280) with a gain of up to

about 5.6 V/V, or 15 dB.

Video Input

The video input stages are high impedance and designed

to accept a maximum signal of 1.0 Vpp with 75 Ω termination

(typically) provided externally. During the clamping period, a

current is provided to the input capacitor by the clamping

circuit which brings the input to a proper dc level (nominal

2.0 V). The blanking and clamping signals are to be provided

externally, with their thresholds at 1.25 V and 3.75 V,

respectively.

Video Output

The video output stages are configured as emitter–

followers, with a driving capability of about 15 mA for each

channel. The dc voltage at these three emitters is set to 1.2 V

(black level). The dc current through each output stage is

determined by the emitter resistor (typically 330 Ω).

Contrast Control

The contrast control varies the gain of three video

amplifiers from a minimum of 0.3 V/V to a maximum of

5.6 V/V when all subcontrast levels are set to 5.0 V.

Subcontrast Control

Each subcontrast control provides a maximum of 26 dB

attenuation on each video amplifier separately.

Clamp Pulse Input

The clamping pulse is provided externally, and the pulse

width must be no less than 500 ns.

Blank Pulse Input

The blanking pulse is used to blank the video signal during

the horizontal sync period, or used as a control pin for video

mute function.

Fast Commutate

This pin should be connected to ground.

Power Supplies

VCC and Video VCC supplies are to be 8.0 V ±5%.

C1

R Input

0.1

C2

G Input

0.1

C3

B Input

0.1

R1 R2 R3

75 75 75

Figure 2. Test Circuit

Blank

Clamp

8.0 V

Input

Input

Blank

R Input

G Input

B Input

Clamp

Fast

Commutate

Video

VCC

MC13280AY

MC13281A/B

C14

C15

47 µF

0.1

VCC

R Emitter

G Emitter

B Emitter

R4

330

R5 R6

330 330

R Output

G Output

B Output

R Clamp

Gnd

V5

Subcontrast Control

R

G

B

C4

C5

C6

C7

C8

0.1

10 µF

0.1

0.1

0.1

5.0 V

5.0 V

5.0 V

G Clamp

B Clamp

Contrast

C13

0.1

C12

0.1

C11

0.1

Clamp Capacitor

C10

0.1

5.0 V

6

MOTOROLA ANALOG IC DEVICE DATA

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