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TDA8222 Datasheet(PDF) 3 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) 3 Page - STMicroelectronics

   
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Tuner AGC
It sinks a current to control the gain of the tuner RF
amplifier. Its starting point is adjusted by an external
potentiometer (Pin 1).
AFC Circuit
It 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 Demodulation
It 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 Function
It 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 Switches
They 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
Symbol
Parameter
Value
Unit
VS
Supply Voltage
13.5
V
VX
Tuner AGC Voltage
VCC
V
Tstg
Storage Temperature
-40, +150
oC
Toper
Operating Temperature
0, +70
oC
THERMAL DATA
Symbol
Parameter
Value
Unit
Rth (j-a)
Junction-ambient Thermal Resistance
Max.
75
oC/W
ELECTRICAL CHARACTERISTICS
(Tamb = 25
oC, VCC = 9V, IF input = 10mVRMS top sync, D = 90%, Video BW = 5MHz,
Sound carrier input : 5.5MHz, 10mVRMS, fm = 1kHz, Audio BW = 20kHz,
∆f = ± 25kHz,
Volume attenuation = 0dB, Rload on Pin 12 = 1k
Ω, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
SUPPLY
VCC
Voltage Operating Range
8.1
9
12.6
V
ICC
Supply Current
I(3) + I(4), VCC = 9V
24
38
52
mA
IF AMPLIFIER
Input Sensitivity
Refer to test circuit
70
µV
R22-23
Differential Input Resistance
1.5
k
C22-23
Differential Input Capacitance
2
pF
GR
Gain Control Range
64
dB
DEMODULATED VIDEO OUTPUT (Pin 18)
VA18
Amplitude
Top sync to white
1.8
2.1
2.4
VPP
VS18
Top Sync Level
without output filter
1.6
1.9
2.2
V
BW
Bandwidth
See Figure 1
5
7
MHz
TDA8222
3/9


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