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PDF TDA3508 Data sheet ( Hoja de datos )
| Número de pieza | TDA3508 | |
| Descripción | Video control combination circuit with automatic cut-off control | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
DATA SHEET
TDA3508
Video control combination circuit
with automatic cut-off control
Product specification
Supersedes data of April 1993
File under Integrated Circuits, IC02
1996 Oct 25
1 page  
Philips Semiconductors
Video control combination circuit with
automatic cut-off control
Product specification
TDA3508
1996 Oct 25
5
5 Page 
Philips Semiconductors
Video control combination circuit with
automatic cut-off control
Product specification
TDA3508
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Sandcastle pulse detector (pin 10)
V10
the following amplitudes are
horizontal and vertical
1.0 1.5 2.0 V
required for separating the various blanking; notes 10 and 11
pulses
required pulses (H + V); 2.1 2.5 2.9 V
note 10
horizontal; note 10
3.0 3.5 4.0 V
required pulses (H); note 10 4.1
4.5 5.0 V
clamping; notes 10 and 12 6.5
7.0 7.5 V
required pulses; note 10 7.6 −
12.0 V
no keying; note 10
− − 1.0 V
I10 input current
− − −110 µA
Notes
1. Maximum value <110 mA after warm-up.
2. Values are proportional to the supply voltage.
3. Matrixed according to equation V(G−Y) = −0.51V(R−Y) − 0.19V(B−Y).
4. When V11-24 < 0.4 V during clamping time, the black levels of the inserted RGB signals are clamped on the black
levels of the internal RGB signals. When V11-24 > 0.9 V during clamping time, the black levels of the inserted RGB
signals are clamped on an internal DC voltage (correct clamping of the external RGB signals is possible only when
they are synchronous with the sandcastle pulse).
5. When pins 21, 22 and 23 are not connected, an internal bias voltage of 5.5 V is supplied.
6. Automatic cut-off control measurement occurs in the following lines after start of the vertical blanking pulse:
a) line 20: measurement of leakage current (R + G + B).
b) line 21: measurement of red cut-off current.
c) line 22: measurement of green cut-off current.
d) line 23: measurement of blue cut-off current.
7. Black level of the measured channel is nominal; the other two channels are blanked to ultra-black.
8. All three channels blanked to ultra-black. 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.
9. Input pin 26 switches to ground during horizontal flyback.
10. The sandcastle pulse is compared with three internal thresholds (proportional to VP) and the given levels separate
the various pulses.
11. Blanked to ultra-black (−25%).
12. Pulse duration ≥3.5 µs.
1996 Oct 25
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TDA3508.PDF ] | |
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