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TDA8222 Datasheet(PDF) 2 Page - STMicroelectronics

No. de Pieza. TDA8222
Descripción  VIDEO & SOUND IF SYSTEM WITH VIDEO AND SOUND SWITCHES
Descarga  9 Pages
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Fabricante  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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TDA8222 Datasheet(HTML) 2 Page - STMicroelectronics

   
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Video
Amplifier
Band Gap
Voltage Reference
IF Amplifier
AFC
AGC
Reference
Amplifier
20
19
22
18
14
12
13
21
11
17
8
9
3
2
5
6
124
23
7
4
TDA8222
D.C. Volume
Control
6dB
15
16
10
FM
Discri
Limiter
LP Filter
Mute
Tuner
AGC
White and
Black Noise Inverter
6dB
BLOCK DIAGRAM
FUNCTIONAL DESCRIPTION
General
The IC consists of the following parts (see block
diagram):
- Three stages gain controlled wide band amplifier
- Quasi-synchronous demodulator
- Video amplifier with white and black noise in-
verter
- AGC circuit which operates on top sync level
- Analog AFC circuit
- FM discriminator
- Mute function
- Video and audio switches
- DC volume control
IF Amplifier
It consists of three cascaded AC coupled differen-
tial gain stages. The gain of each amplifier is con-
trolled by the AGC voltage. The global AGC range
is more than 60dB. Thanks to the internal AC
coupling no DC feedback is required.
Demodulation
It is a quasi-synchronous type with passive carrier
regeneration done by an external tuned circuit, and
a limiter amplifier.
Video Amplifier
The video amplifier provides a 2VPP video signal to
the output with a good phase and amplitude fre-
quency response.
White and Black Noise Inverter
A fixed 3.2V level is inserted when a white spot
above 4.5V (measured on the video output Pin 18)
happens, this prevents from very noisy signal on
the screen.
A fixed 2.5V level is inserted when a black spot
below 1.3V happens, this to avoid synchronization
on parasitic signals.
AGC Circuit
The AGC detector operates on top sync level, an
external capacitor on Pin 24 controls the time con-
stant.
The voltage on this capacitor is converted into a
current to control the amplifier stage.
TDA8222
2/9


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