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TDA8349A датащи(PDF) 4 Page - NXP Semiconductors

номер детали TDA8349A
подробное описание детали  Multistandard IF amplifier and demodulator
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8349A датащи(HTML) 4 Page - NXP Semiconductors

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February 1991
4
Philips Semiconductors
Product specification
Multistandard IF amplifier and demodulator
TDA8349A
PINNING
PIN
DESCRIPTION
1,2
balanced IF inputs
3
tuner AGC starting point adjustment
4
tuner AGC output
5
AGC time constant
6
AFC on/off switch and sample-and-hold capacitor
7
video switch
8
AFC output Q1
9
AFC output Q2
10
video switch external input
11
video output
12
video switch internal input
13
video switch output
14
positive supply voltage
15,16
reference tuned circuit for demodulator
17
ground
18
mute output
19
coincidence filter
20
system switch
FUNCTIONAL DESCRIPTION
General
The IC consists of the following parts as illustrated in Fig.1:
• Gain controlled video IF amplifier
• Quasi-synchronous demodulator
• Video amplifier/buffer with white spot clamp/inverter and
noise clamp
• AGC circuit which operates either on top sync level
(negative modulation) or on white level (positive
modulation) or on top level (MAC)
• AFC circuit with sample-and-hold circuit for negatively
modulated signals, on/off switch and a digital or analog
output (switchable)
• Circuit for switching between positive and negative
modulation
• Video recognition circuit for sound muting and tuning
indication
• Video switch which facilitates selection between two
different video signals, with different gain settings
IF amplifier
The IF amplifier consists of three AC coupled differential
gain stages with adjustable feedback in the emitter. The
AC coupling allows simple biasing, cascades can be used
and no DC feedback is required. This provides a control
range above 70 dB with good linearity. The minimum input
signal to obtain the nominal output amplitude is
50
µV RMS.
Demodulator
The demodulator is a quasi-synchronous circuit that
employs passive carrier regeneration and a tuned circuit
for selectivity. The regenerated carrier signal is limited by
a clamping circuit before it is fed to the demodulator.
Switching between positive and negative modulation is
achieved by the system switch which provides currents to
the demodulator in a positive or negative direction.
Video amplifier
The video amplifier based on the feedback principle
improves the linearity of the video output buffer. It has an
internal bandgap reference to ensure a stable video output
at different supply voltages and temperatures. This


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