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PDF TDA3567 Data sheet ( Hoja de datos )
| Número de pieza | TDA3567 | |
| Descripción | NTSC decoder | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA3567
NTSC decoder
Product specification
File under Integrated Circuits, IC02
June 1986
1 page  
Philips Semiconductors
NTSC decoder
Product specification
TDA3567
In these equations (R-Y)IN and (B-Y)IN indicate the colour difference signal amplitudes, when the chrominance signal is
demodulated with a phase difference between the R-Y and B-Y demodulator of 90° and a gain ratio B-Y/R-Y = 1,78.
RGB matrix circuit and amplifiers
The three matrix and amplifier circuits are identical. The luminance signal and the colour difference signals are added in
the matrix circuit to obtain the colour signal.
Output signals are 5 V (peak-to-peak) (black-white) for the following nominal input signals and control settings.
• Luminance 450 mV (peak-to-peak)
• Chrominance 550 mV (peak-to-peak) (burst-to-chrominance ratio of the input 1 : 2.2)
• Contrast −3 dB (maximum)
• Saturation −10 dB (maximum)
The maximum available output voltage is approximately 7 V (peak-to-peak). The black level of the red channel is
compared with a variable external reference level (pin 9), which provides the brightness control. The control loop is
closed via the luminance input.
The luminance input is varied to control the black level control, therefore the green and blue outputs will follow any
variation of the red output. The output of the black control can be varied between 2 V to 4 V. The corresponding
brightness control voltage is shown in Fig.4.
If the output signal surpasses the level of 9 V the peak-white limiter circuit becomes active and reduces the output signal
via the contrast control.
Blanking of RGB signals
A slicing level of about 1,5 V is used for this blanking function, so that the wide part of the sandcastle pulse is separated
from the rest of the pulse. During blanking a level of + 2 V is available at the output.
June 1986
5
5 Page 
Philips Semiconductors
NTSC decoder
Product specification
TDA3567
PARAMETER
CONDITIONS
SYMBOL
MIN. TYP. MAX.
UNIT
Sandcastle input
Level at which the RGB
blanking is activated
Level at which burst gate
V7-17
1,0 1,5 2,0 V
clamping pulses are
separated
V7-17
6,5 7,0 7,5 V
Delay between black level
clamping and burst
gating pulse
td 300 375 450 ns
Input currents
V7-17 = 0 to 1 V
V7-17 = 1 to 8,5 V
V7-17 = 8,5 to 12 V
I7
I7
I7
− − −1 mA
− −20 −40 µA
− − 2 mA
Notes to the characteristics
1. Signal with negative going sync; amplitude includes sync pulse amplitude.
2. Indicated is a signal for colour bar with 75% saturation, so the chrominance to burst ratio is 2,2 : 1.
3. Nominal contrast is specified as maximum contrast −3 dB and nominal saturation as maximum saturation −10 dB.
4. Cross coupling is measured under the following condition:
- input signals nominal;
- contrast and saturation such that nominal output signals are obtained;
- the signals at the output at which no signal should be available must be compared with the nominal output signal
at that output.
5. The signal-to-noise ratio is specified as peak-to-peak signal with respect to RMS noise.
6. When this level is exceeded the amplifier of the output signal is reduced via a discharge of the capacitor on pin 7
(contrast control). Discharge current is 5,5 mA.
7. These matrixed values are found by measuring the ratio of the various output signals. The values are derived from
the matrix equations given in the section ‘FUNCTIONAL DESCRIPTION’.
June 1986
11
11 Page | ||
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