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TDA8708BT датащи(PDF) 5 Page - NXP Semiconductors

номер детали TDA8708BT
подробное описание детали  Video analog input interface
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8708BT датащи(HTML) 5 Page - NXP Semiconductors

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1996 Nov 26
5
Philips Semiconductors
Product specification
Video analog input interface
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).
THERMAL CHARACTERISTICS
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
VCCA
analog supply voltage
−0.3
+7.0
V
VCCD
digital supply voltage
−0.3
+7.0
V
VCCO
TTL output supply voltage
−0.3
+7.0
V
∆V
CC
supply voltage differences:
VCCA − VCCD
−1.0
+1.0
V
VCCO − VCCD
−1.0
+1.0
V
VCCA − VCCO
−1.0
+1.0
V
VI
input voltage
−0.3
VCCA
V
IO
output current
0
+10
mA
Tstg
storage temperature
−55
+150
°C
Tamb
operating ambient temperature
0
+70
°C
Tj
junction temperature
0
+125
°C
SYMBOL
PARAMETER
VALUE
UNIT
Rth j-a
thermal resistance from junction to ambient in free air
70
K/W


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