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PDF TDA3561A Data sheet ( Hoja de datos )
| Número de pieza | TDA3561A | |
| Descripción | PAL decoder | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA3561A
PAL decoder
Product specification
File under Integrated Circuits, IC02
September 1982
1 page  
Philips Semiconductors
PAL decoder
Product specification
TDA3561A
Maximum output voltage (peak-to-peak value)
RL = 2 kΩ
Distortion of chrominance amplifier
at V28-27(p-p) = 2 V up to V3-27(p-p) = 1 V
Frequency response between 0 and 5 MHz
Saturation control range (see Fig.4)
Input current saturation control at V6−27 = 3 V
Tracking between luminance and chrominance
with contrast control over a range of 10 dB
Cross-coupling between luminance
and chrominance amplifier; note 10
Signal-to-noise ratio
at nominal input signal; note 11
Phase shift between burst and chrominance
at nominal contrast/saturation
Output impedance of chrominance amplifier
Maximum output current
Reference part
Phase locked loop:
− catching range; note 4
− phase shift; note 5
Oscillator:
− temperature coefficient of oscillator frequency; note 4
− frequency deviation for VP changing from 10 to 13,2 V; note 4
− input resistance (pin 26)
− input capacitance (pin 26)
− output resistance (pin 25)
− output voltage (peak-to-peak value; pin 25)
A.C.C. generation:
− reference voltage (pin 4)
− control voltage at nominal input signal (pin 2)
− control voltage without chrominance input (pin 2)
− colour-off voltage (pin 2)
− colour-on voltage (pin 2)
− identification-on voltage (pin 2)
V28-27(p-p)
d
I6
S/N
∆ϕ
Z28-27
I28
typ. 4,0
typ. 1,5
<5
−2
> 50
< 15
<2
< −46
> 56
< ± 5o
typ. 25
< 15
V
%
%
dB
dB
µA
dB
dB
dB
Ω
mA
R26-27
C26-27
R25-27
V25−27(p-p)
V4−27
V2−27
V2−27
V2−27
V2−27
V2−27
> 500
typ. 700
< 5°
Hz
Hz
typ. −1,5
typ. 40
typ. 340
260 to 420
< 10
typ. 150
100 to 200
typ. 700
Hz/K
Hz
Ω
Ω
pF
Ω
Ω
mV
typ. 4,9
typ. 5,1
typ. 2,65
typ. 3,15
typ. 3,4
typ. 1,9
V
V
V
V
V
V
September 1982
5
5 Page 
Philips Semiconductors
PAL decoder
Product specification
TDA3561A
APPLICATION INFORMATION
The function is described against the corresponding pin
number.
1. + 12 V power supply
The circuit gives good operation in a supply voltage range
between 8 and 13,2 V provided that the supply voltage for
the controls is equal to the supply voltage for the
TDA3561A. All signal and control levels have a linear
dependency on the supply voltage. The current taken by
the device at 12 V is typically 85 mA. It is linearly
dependent on the supply voltage.
2. Control voltage for identification
This pin requires a detection capacitor of about 330 nF for
correct operation. The voltages available under various
signal conditions are given in the specification.
3. Chrominance input
The chroma signal must be a.c.-coupled to the input.
Its amplitude must be between 55 mV and 1100 mV
peak-to-peak (25 mV to 500 mV peak-to-peak burst
signal). All figures for the chroma signals are based on a
colour bar signal with 75% saturation, that is the
burst-to-chroma ratio of the input signal is 1 : 2,25.
4. Reference voltage A.C.C. detector
This pin must be decoupled by a capacitor of about 330
nF. The voltage at this pin is 4,9 V.
5. Control voltage A.C.C.
The A.C.C. is obtained by synchronous detection of the
burst signal followed by a peak detector. A good noise
immunity is obtained in this way and an increase of the
colour for weak input signals is prevented. The
recommended capacitor value at this pin is 2,2 µF.
6. Saturation control
The saturation control range is in excess of 50 dB.
The control voltage range is 2 to 4 V. Saturation control is
a linear function of the control voltage.
When the colour killer is active, the saturation control
voltage is reduced to a low level if the resistance of the
external saturation control network is sufficiently high.
Then the chroma amplifier supplies no signal to the
demodulator. Colour switch-on can be delayed by proper
choice of the time constant for the saturation control
setting circuit.
When the saturation control pin is connected to the power
supply the colour killer circuit is overruled so that the colour
signal is visible on the screen. In this way it is possible to
adjust the oscillator frequency without using a frequency
counter (see also pins 25 and 26).
7. Contrast control
The contrast control range is 20 dB for a control voltage
change from + 2 to + 4 V. Contrast control is a linear
function of the control voltage. The output signal is
suppressed when the control voltage is 1 V or less. If one
or more output signals surpasses the level of 9 V the peak
white limiter circuit becomes active and reduces the output
signals via the contrast control by discharging C2 via an
internal current sink.
8. Sandcastle and field blanking input
The output signals are blanked if the amplitude of the input
pulse is between 2 and 6,5 V. The burst gate and clamping
circuits are activated if the input pulse exceeds a level of
7,5 V.
The higher part of the sandcastle pulse should start just
after the sync pulse to prevent clamping of video signal on
the sync pulse. The width should be about 4 µs for proper
A.C.C. operation.
9. Video-data switching
The insertion circuit is activated by means of this input by
an input pulse between 1 V and 2 V. In that condition, the
internal RGB signals are switched off and the inserted
signals are supplied to the output amplifiers. If only normal
operation is wanted this pin should be connected to the
negative supply. The switching times are very short
(< 20 ns) to avoid coloured edges of the inserted signals
on the screen.
10. Luminance signal input
The input signal should have a peak-to-peak amplitude of
0,45 V (peak white to sync) to obtain a black-white output
signal to 5 V at nominal contrast. It must be a.c.-coupled to
the input by a capacitor of about 22 nF. The signal is
clamped at the input to an internal reference voltage.
A 1 kΩ luminance delay line can be applied because the
luminance input impedance is made very high.
Consequently the charging and discharging currents of the
coupling capacitor are very small and do not influence the
signal level at the input noticeably. Additionally the
coupling capacitor value may be small.
September 1982
11
11 Page | ||
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