MC13280AY
MC13281B MC13281A
Pin
Pin
12
16
Name
B Clamp
Capacitor
14
18
G Clamp
Capacitor
MC13280AY MC13281A/B
PIN FUNCTION DESCRIPTION (continued)
Equivalent Internal Circuit
1.2 V
Video Out
VCC
Description
A 100 nF capacitor is connected to
each of these pins.
The capacitor is used for video output
dc restoration.
17
21
R Clamp
Capacitor
13
17
Video VCC
16
20
5.0 Vref (V5)
5.0 V
10 µF
VCC
Band Gap
Regulator
R
0.8 R
Connect to 8.0 V dc supply, ±5%. The
VCC is for the video output stage. It is
internally connected to the collectors
of the output transistors.
5.0 V regulator. Minimum 10 µF
capacitor is required for noise filtering
and compensation. It can source up
to 20 mA but not sink current. Output
impedance is ≈ 10 Ω. Recommended
for use as a voltage reference only.
19
23
Clamp
VCC Vref1
Vref2
30 k
10 k
This pin is used for video clamping.
The threshold clamping level is 3.75 V.
3.75 V
20
24
Blank
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
MOTOROLA ANALOG IC DEVICE DATA
5