MB40166/MB40176
s FUNCTIONAL DESCRIPTIONS CLAMP CIRCUIT
The clamp circuit contained in MB40166/MB40176 is a peak detector type, in which the top of the sync of the composite sync
signal is clamped.
Clamp voltage is common to the reference voltage (0.8 x VCC) of A/D and D/A circuits.
• MB40166
(1) Providing a clamp circuit
20
VCLMP
Clamp
-+
21
A/D
A
VINA
D/A
24
(DA6 to DA1)
8
13
2
7
(DD1 to DD6)
VOUT
VCCA
VCCA
1V
Given voltage Input level at A
VREF
Input level at VINA pin
VREF
(2) Directly feeding the signal at the VINA pin
Output level of Vout
VINA
21
A/D
D/A
24
8
13
2
(DA6 to DA1)
7
(DD1 to DD6)
VCCA
VCCA
VOUT
VREF
Input level at VINA pin
VREF
Output level of Vout
10