MC13282A View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC13282A Datasheet PDF : 12 Pages
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Pin
Name
23 Clamp
24 Blank
MC13282A
PIN FUNCTION DESCRIPTION (continued)
Equivalent Internal Circuit
Description
VCC Vref1
Vref2
30 k
This pin is used for video clamping.
The threshold clamping level is 3.75 V.
10 k
3.75 V
VCC Vref1
Vref2
30 k
10 k
This pin is used for video blanking.
The threshold blanking level is 1.25 V.
1.25 V
FUNCTIONAL DESCRIPTION
The MC13282A is composed of three video amplifiers,
clamping and blanking circuitry with contrast and subcontrast
controls and OSD interface. Each video amplifier is designed
to have a –3.0 dB bandwidth of 100 MHz 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 sitting 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.
OSD Interface
The three OSD inputs are TTL compatible and have a
typical bandwidth of 50 MHz. A fast commutate pin is
provided to select either the video or the OSD inputs as the
source for the outputs. OSD contrast control is also
provided to set the amount of gain required when OSD
inputs are selected.
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.
Power Supplies
VCC and Video VCC supplies are to be 8.0 V ±5%.
6
MOTOROLA ANALOG IC DEVICE DATA
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