cxa1700aq Sony Electronics, cxa1700aq Datasheet - Page 38

• Manufacturer Part Number: cxa1700aq
• Description: Luminance And Color Signal Processing For 8mm Vcr
• Manufacturer: Sony Electronics

3. REC LEVEL adjustment
4. MASK DDS
The video signal input to VIN1 (Pin 30) and VIN2 (Pin 28) is selected by mode INSEL, and when mode
video AGC is High, the signal is passed through SYNC AGC and PEAK AGC and then is output from Y
OUT (Pin 34). The output level can be adjusted by applying an external DC bias (1.3 to 2.6V [Vcc =
4.75V]) to RECL/JVD (Pin 31). In the case of white 100%, 500mVp-p input, the following are the standard
characteristics.
DDS/MASK (Pin 26) is the VOW (character level) signal and the VOB (character background) and
masking timing pulse input pin. The threshold value for source signal and VOB/masking is 1.1V, and the
threshold value for VOB/masking and VOW is 2.0V (when Vcc = 4.75V). In addition, the VOW replacement
signal level can be varied within the range of the DC level (2.3V to 3.0V) for this pin; those standard
characteristics are shown below.
(mVp-p)
600
500
400
100
(%)
80
60
1.0
2.0
REC L/JVD (Pin 31) control DC (V)
1.5
MASK/DDS (Pin 26) DC level
—38—
2.0
2.5
2.5
( V
CC
=4.75V)
3.0
3.0
CXA1700AQ/AR