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TDA8222
VIDEO & SOUND IF SYSTEM WITH VIDEO AND SOUND SWITCHES
TDA8222VIDEO & SOUND IF SYSTEM
WITH VIDEO AND SOUND SWITCHES
October 1993 3 STAGE IF GAIN CONTROLLED AMPLIFIER. SYNCHRONOUS VIDEO DEMODULATOR. TOP SYNC AGC CIRCUIT. WHITE AND BLACK NOISE INVERTER. TUNER AGC OUTPUT FOR PNP TUNERS
(suitable also for MOSFET tuners). ANALOG AFC. FM DETECTOR. AUDIO AND VIDEO SWITCHES COMPAT-
IBLE WITH SCART EUROPEAN NORM. DC VOLUME CONTROL. MUTE FUNCTION
PIN CONNECTIONSDESCRIPTIONThe TDA8222 is a video and sound IF circuit in
Shrink DIP24 package for color and black and white
TV sets. It is intended to operate with a negatively
modulated vision carrier and frequency modulated
sound carrier. It incorporates video and audio
switches compatible with SCART european norm.
1/9
BLOCK DIAGRAM
FUNCTIONAL DESCRIPTION
GeneralThe 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 AmplifierIt 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.
DemodulationIt is a quasi-synchronous type with passive carrier
regeneration done by an external tuned circuit, and
a limiter amplifier.
Video AmplifierThe video amplifier provides a 2VPP video signal to
the output with a good phase and amplitude fre-
quency response.
White and Black Noise Inverter 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. fixed 2.5V level is inserted when a black spot
below 1.3V happens, this to avoid synchronization
on parasitic signals.
AGC CircuitThe 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.
TDA82222/9
Tuner AGCIt sinks a current to control the gain of the tuner RF
amplifier. Its starting point is adjusted by an external
potentiometer (Pin 1).
AFC CircuitIt is a FM demodulator stage which delivers on
Pin 19 a current proportional to the frequency dif-
ference between the IF input signal and the refer-
ence IF frequency of the external LC on Pin 20. This
current is converted into a voltage by means of a
resistor network.
FM DemodulationIt consists of a three stage limiter amplifier in order
to reject the amplitude modulation and a quadra-
ture demodulator. The deemphasis filter is built
with an internal resistor and an external capacitor
on Pin 11.
Mute FunctionIt is an internal switch to cut-off the internal audio
signal. It acts when a level below 2.1V is applied
on Pin 15. When no mute, the Pin 15 must be driven
with a high DC impedance.
Video and Audio SwitchesThey are both controlled by the Pin 21 voltage.
Internal sources or external sources can be sent to
the outputs (Pin 12 for video and Pin 8 for audio).
The internal signals are selected by a control level
below 2.5V on Pin 21, the external ones by a control
level above 5V.
The gain of the video switch is 6dB for both internal
and external signals.
The gain of the audio switch is 0dB for the maxi-
mum volume.
ABSOLUTE MAXIMUM RATINGS
THERMAL DATA
ELECTRICAL CHARACTERISTICS(Tamb = 25o C, VCC = 9V, IF input = 10mVRMS top sync, D = 90%, Video BW = 5MHz,
Sound carrier input : 5.5MHz, 10mVRMS, fm = 1kHz, Audio BW = 20kHz, Δf = ± 25kHz,
Volume attenuation = 0dB, Rload on Pin 12 = 1kΩ, unless otherwise specified)
SUPPLY
IF AMPLIFIER
DEMODULATED VIDEO OUTPUT (Pin 18)
TDA82223/9
ELECTRICAL CHARACTERISTICS (continued)(Tamb = 25o C, VCC = 9V, IF input = 10mVRMS top sync, D = 90%, Video BW = 5MHz,
Sound carrier input : 5.5MHz, 10mVRMS, fm = 1kHz, Audio BW = 20kHz, Δf = ± 25kHz,
Volume attenuation = 0dB, Rload on Pin 12 = 1kΩ, unless otherwise specified)
DEMODULATED VIDEO OUTPUT (Pin 18) (continued)
AGC CIRCUIT
TUNER AGC
AFC
FM SOUND DEMODULATION
AUDIO OUTPUT (PIn 11)
VOLUME CONTROL
TDA82224/9
ELECTRICAL CHARACTERISTICS (continued)(Tamb = 25o C, VCC = 9V, IF input = 10mVRMS top sync, D = 90%, Video BW = 5MHz,
Sound carrier input : 5.5MHz, 10mVRMS, fm = 1kHz, Audio BW = 20kHz, Δf = ± 25kHz,
Volume attenuation = 0dB, Rload on Pin 12 = 1kΩ, unless otherwise specified)
AUDIO SWITCH
VIDEO SWITCH
SWITCHING INPUT
MUTE
TDA82225/9
TEST CIRCUIT
TDA82226/9
