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TDA8362 Datenblatt(PDF) 8 Page - NXP Semiconductors

Teilenummer TDA8362
Bauteilbeschribung  Integrated PAL and PAL/NTSC TV processors
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Hersteller  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

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March 1994
8
Philips Semiconductors
Objective specification
Integrated PAL and PAL/NTSC TV
processors
TDA8360; TDA8361; TDA8362
VFB
41
vertical feedback input
VRAMP
42
vertical ramp generator
VOUT
43
vertical output
AFCOUT
44
AFC output
IFIN1
45
IF input 1
IFIN2
46
IF input 2
AGCOUT
47
tuner AGC output
DECAGC
48
AGC decoupling capacitor
TUNEADJ
49
tuner take-over adjustment
AUOUT
50
audio output
DECDEM
51
decoupling sound demodulator
DECBG
52
decoupling bandgap supply
SYMBOL
PIN
DESCRIPTION
TDA8360
The TDA8360 has the following
differences to the pinning:
Pin 6: external audio input not
connected
Pin 15: external CVBS input not
connected
Pin 16: chrominance and A/V switch
input not connected
Pin 27: hue control input not
connected.
TDA8361
The TDA8361 has the following
differences to the pinning:
Pin 1: only audio de-emphasis
Pin 27: only hue control
Pin 32: 4.43 MHz output for TDA8395
is not connected.
FUNCTIONAL DESCRIPTION
Video IF amplifier
The IF amplifier contains
3 AC-coupled control stages with a
total gain control range of greater
than 60 dB. The sensitivity of the
circuit is comparable with that of
modern IF ICs.
The reference carrier for the video
demodulator is obtained by means of
passive regeneration of the picture
carrier. The external reference tuned
circuit is the only remaining
adjustment of the IC.
In the TDA8362 the polarity of the
demodulator can be switched so that
the circuit is suitable for both positive
and negative modulated signals.
The AFC circuit is driven with the
same reference signal as the video
demodulator. To ensure that the
video content does not disturb the
AFC operation a sample-and-hold
circuit is incorporated; the capacitor
for this function is internal. The AFC
output voltage is 6 V.
The AGC detector operates on levels,
top sync for negative modulated and
top white for positive modulated
signals.The AGC detector time
constant capacitor is connected
externally. This is mainly because of
the flexibility of the application.
The time constant of the AGC system
during positive modulation
(TDA8362) is slow, this is to avoid any
visible picture variations. This,
however, causes the system to react
very slowly to sudden changes in the
input signal amplitude.
To overcome this problem a speed-up
circuit has been included which
detects whether the AGC detector is
activated every frame period. If,
during a 3-frame period, no action is
detected the speed of the system is
increased. When the incoming signal
has no peak white information (e.g.
test lines in the vertical retrace period)
the gain would be video signal
dependent. To avoid this effect the
circuit also contains a black level
AGC detector which is activated when
the black level of the video signal
exceeds a certain level.
The TDA8361 and TDA8362 contain
a video identification circuit which is
independent of the synchronization
circuit. Therefore search tuning is
possible when the display section of
the receiver is used as a monitor. In
the TDA8360 this circuit is only used
for stable OSD at no signal input. In
the normal television mode the
identification output is connected to
the coincidence detector, this applies
to all three devices. The identification
output voltage is LOW when no
transmitter is identified. In this
condition the sound demodulator is
switched off (mute function). When a
transmitter is identified the output
voltage is HIGH. The voltage level is
dependent on the frequency of the
incoming chrominance signal.


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