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Número de pieza TDA8708BT
Descripción Video analog input interface
Fabricantes NXP Semiconductors 
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No Preview Available ! TDA8708BT Hoja de datos, Descripción, Manual

INTEGRATED CIRCUITS
DATA SHEET
TDA8708B
Video analog input interface
Product specification
Supersedes data of June 1994
File under Integrated Circuits, IC02
1996 Nov 26

1 page




TDA8708BT pdf
Philips Semiconductors
Video analog input interface
Product specification
TDA8708B
FUNCTIONAL DESCRIPTION
The TDA8708B provides a simple interface for decoding
video signals.
The TDA8708B operates in configuration mode 1
(see Fig.4) when the video signals are weak (i.e. when the
gain of the AGC amplifier has not yet reached its optimum
value). This enables a fast recovery of the synchronization
pulses in the decoder circuit. When the pulses at the
GATE A and GATE B inputs become distinct (GATE A and
GATE B pulses are synchronization pulses occurring
during the sync period and rear porch respectively) the
TDA8708B automatically switches to configuration mode 2
(see Fig.5).
When the TDA8708B is in configuration mode 1, the gain
of the AGC amplifier will be roughly adjusted (sync level to
a digital output level of 0 and the peak level to a digital
output level of 255).
In configuration mode 2 the digital output of the ADC is
compared to internal digital reference levels.
The voltage across the capacitor connected to the AGC
pin controls the gain of the video amplifier. This is the gain
control loop.
The sync level comparator is active during a positive-going
pulse at the GATE A input. This means that the sync pulse
of the composite video signal is used as an amplitude
reference. The bottom of the sync pulse is adjusted to
obtain a digital output of logic 0 at the converter output.
As the black level is at digital level 64, the sync pulse will
have a digital amplitude of 64 LSBs.
The use of nominal signals will prevent the output from
exceeding a digital code of 213.
The clamp level control is accomplished by using the same
techniques as used for the gain control. The black-level
digital comparator is active during a positive-going pulse at
the GATE B input. The clamp capacitor will be charged or
discharged to adjust the digital output to code 64.
LIMITING VALUES
In accordance with the Absolute Maximum Rating System (IEC 134).
SYMBOL
PARAMETER
VCCA
VCCD
VCCO
VCC
VI
IO
Tstg
Tamb
Tj
analog supply voltage
digital supply voltage
TTL output supply voltage
supply voltage differences:
VCCA VCCD
VCCO VCCD
VCCA VCCO
input voltage
output current
storage temperature
operating ambient temperature
junction temperature
MIN.
0.3
0.3
0.3
MAX.
+7.0
+7.0
+7.0
UNIT
V
V
V
1.0
1.0
1.0
0.3
0
55
0
0
+1.0
+1.0
+1.0
VCCA
+10
+150
+70
+125
V
V
V
V
mA
°C
°C
°C
THERMAL CHARACTERISTICS
SYMBOL
Rth j-a
PARAMETER
thermal resistance from junction to ambient in free air
VALUE
70
UNIT
K/W
1996 Nov 26
5

5 Page





TDA8708BT arduino
Philips Semiconductors
Video analog input interface
Product specification
TDA8708B
handbook, full pagewidth
5 MHz sine wave
0.25 V
1.0 V
64 µs
0.25 V
MBB959
Fig.3 Test signal on the ADCIN pin for differential gain and phase measurements.
k, full pagewidthdigital
output
level
255
peak-level gain control
0
GATE A
GATE B
MODE 1
1996 Nov 26
black-level
clamping
sync-level gain control
Fig.4 Control mode 1.
11
MBB969
time

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