MC13280AYP

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 W 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 (nominal2.0 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 emitterfollowers, 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 W).

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.