tda3507 NXP Semiconductors, tda3507 Datasheet - Page 11

• Manufacturer Part Number: tda3507
• Description: Video Control Combination Circuit With Automatic Cut-off Control
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Notes
1.
2. Values are proportional to the supply voltage.
3. When V
4. When pins 21, 22 and 23 are not connected, an internal bias voltage of 5,5 V is supplied.
5. Automatic cut-off control measurement occurs in the following lines after start of the vertical blanking pulse:
6. Black level of the measured channel is nominal; the other two channels are blanked to ultra-black.
7. All three channels blanked to ultra-black.
8. The sandcastle pulse is compared with three internal thresholds (proportional to V
9. Blanked to ultra-black ( 25%).
10. Pulse duration
November 1987
Difference in gain between
Sandcastle pulse detector
Levels for separating the
Input current
Video control combination circuit with
automatic cut-off control
normal mode and signal insertion
mode
(pin 10)
following pulses:
horizontal and vertical
blanking pulses
required pulses (H V)
horizontal pulses
required pulses (H)
clamping pulses
required pulses
no keying
levels of the internal RGB signals.
When V
DC voltage (correct clamping of the external RGB signals is possible only when they are synchronous with the
sandcastle pulse).
line 12: measurement of leakage current (R G
line 13: measurement of red cut-off current
line 14: measurement of green cut-off current
line 15: measurement of blue cut-off current
The cut-off control cycle occurs when the vertical blanking part of the sandcastle pulse contains more than 3 line
pulses.
The internal blanking continues until the end of the last measured line.
The vertical blanking pulse is not allowed to contain more than 34 line pulses, otherwise another control cycle begins.
the various pulses.
115 mA after warm-up.
11-24
11-24
PARAMETER
> 0,9 V during clamping time
< 0,4 V during clamping time
3,5 s.
note 8
note 9
note 10
CONDITIONS
the black levels of the inserted RGB signals are clamped on an internal
the black levels of the inserted RGB signals are clamped on the black
B)
11
V
V
V
V
V
V
V
I
G
10
10
10
10
10
10
10
SYMBOL
10
1,3,5
1,0
2,1
3,0
4,1
6,5
7,6
MIN.
P
) and the given levels separate
1,5
2,5
3,5
4,5
7,0
TYP.
Product specification
10
2,0
2,9
4,0
5,0
7,5
12,0
1,0
110
MAX.
TDA3507
%
V
V
V
V
V
V
V
A
UNIT