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MC13281AP Scheda tecnica(PDF) 6 Page - Motorola, Inc |
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MC13281AP Scheda tecnica(HTML) 6 Page - Motorola, Inc |
6 / 12 page MC13280AY MC13281A/B 6 MOTOROLA ANALOG IC DEVICE DATA 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%. Figure 2. Test Circuit Contrast R R Input G Input B Input Gnd V5 Blank Clamp Fast Commutate Video VCC VCC R Emitter G Emitter B Emitter R Clamp G Clamp B Clamp MC13280AY MC13281A/B R1 75 R2 75 R3 75 Clamp Input 8.0 V C15 0.1 R4 330 R5 330 R6 330 R Output G Output B Output Clamp Capacitor C11 0.1 C12 0.1 C13 0.1 R Input G Input B Input C1 0.1 C2 0.1 C10 0.1 C8 0.1 C7 0.1 C6 0.1 C14 47 µF Blank Input C4 0.1 C5 10 µF C3 0.1 5.0 V 5.0 V 5.0 V 5.0 V Subcontrast Control G B |
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