ICs for TV
s
Electrical Characteristics at V
CC
=
9 V, T
a
=
25
°C
(continued)
•
Explanations of testing method
1. Measurement of B−Y discrimination signal amplitude
2.
AN5637
Pin15
Pin9
∆V
R
Pin10
∆V
B
Input 100 % white signal and adjust the voltage of Pin4 so that
∆V
B
becomes 0 mV. Let the adjusted voltage be
V
AD4
.
And let the value of
∆V
R
based on input frequency at that time be f
BER
, black level error (R−Y).
3. Calculate by using the value of Pin10 (B−Y) output amplitude V
BY
when the color bar signal (Deviation
=
460
kHz) is input to Pin16 and the value of Pin10 output V
NOISE
when the color bar signal (Deviation
=
0 Hz) is input.
S/N
=
20 log
10
V
BY
/V
NOISE
4. The horizontal and vertical blanking level V
BL
is determined by the internal stabilizing power supply circuit.
5. The burst gate level V
BG
is determined by dividing the IC built-in resistor between V
CC
-GND.
V
BG
=
V
CC
×
3.8/9 (typ.)
7
PANASONIC [ PANASONIC SEMICONDUCTOR ]
