TDA8222
VIDEO & 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
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
24
23
22
21
11
12
TUNER AGC STARTING POINT ADJUSTMENT
TUNER AGC OUTPUT
VIDEO SWITCH
BALANCED IF INPUT
GROUND
AUDIO SWITCH OUTPUT
VOLUME CONTROL
BALANCED IF INPUT
FM REFERENCE TUNED CIRCUIT
DEMODULATED AUDIO OUTPUT
VIDEO SWITCH OUTPUT
V
CC
V
CC
AGC TIME CONSTANT
IF LC
IF LC
SWITCHING INPUT
AFC LC
AFC OUTPUT
DEMODULATED CVBS OUTPUT
EXTERNAL AUDIO INPUT
2nd IF SOUND INPUT
2nd IF DECOUPLING INPUT + MUTE
INTERNAL VIDEO INPUT
EXTERNAL VIDEO INPUT
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E
P
S
PIN CONNECTIONS
SHRINK DIP24
(Plastic Package)
ORDER CODE : TDA8222
DESCRIPTION
The 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
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
1
24
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
8
2
2
2
-0
2
.
EP
S
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 2V
PP
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
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
V
S
Supply Voltage
13.5
V
V
X
Tuner AGC Voltage
V
CC
V
T
stg
Storage Temperature
-40, +150
o
C
T
oper
Operating Temperature
0, +70
o
C
82
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.
T
B
L
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th (j-a)
Junction-ambient Thermal Resistance
Max.
75
o
C/W
82
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2.
T
B
L
ELECTRICAL CHARACTERISTICS
(T
amb
= 25
o
C, V
CC
= 9V, IF input = 10mV
RMS
top sync, D = 90%, Video BW = 5MHz,
Sound carrier input : 5.5MHz, 10mV
RMS
, f
m
= 1kHz, Audio BW = 20kHz,
f =
25kHz,
Volume attenuation = 0dB, R
load
on Pin 12 = 1k
, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
SUPPLY
V
CC
Voltage Operating Range
8.1
9
12.6
V
I
CC
Supply Current
I(3) + I(4), V
CC
= 9V
24
38
52
mA
IF AMPLIFIER
Input Sensitivity
Refer to test circuit
70
V
R
22-23
Differential Input Resistance
1.5
k
C
22-23
Differential Input Capacitance
2
pF
G
R
Gain Control Range
64
dB
DEMODULATED VIDEO OUTPUT (Pin 18)
V
A18
Amplitude
Top sync to white
1.8
2.1
2.4
V
PP
V
S18
Top Sync Level
without output filter
1.6
1.9
2.2
V
BW
Bandwidth
See Figure 1
5
7
MHz
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3
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T
B
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TDA8222
3/9
ELECTRICAL CHARACTERISTICS (continued)
(T
amb
= 25
o
C, V
CC
= 9V, IF input = 10mV
RMS
top sync, D = 90%, Video BW = 5MHz,
Sound carrier input : 5.5MHz, 10mV
RMS
, f
m
= 1kHz, Audio BW = 20kHz,
f =
25kHz,
Volume attenuation = 0dB, R
load
on Pin 12 = 1k
, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
DEMODULATED VIDEO OUTPUT (Pin 18) (continued)
D
G
Differential Gain
IF input = 5mV
RMS
top sync
3
7
%
D
P
Differential Phase
3
7
Degree
V
18
Residual Carrier Signal (RMS
value)
1
10
mV
V
18
Residual 2nd Harmonic (RMS
value)
2
20
mV
I
18
Internal Bias of Emitter Follower
3
5
mA
S/N
Signal to Noise Ratio
Note 1
55
dB
Intermodulation 1.07MHz
Note 2
50
dB
V
WTH
White Noise Threshold Voltage
See Figure 5
4.5
V
V
WIL
White Noise Insertion Level
See Figure 5
3.2
V
V
BTH
Black Noise Threshold Voltage
1.3
V
V
BIL
Black Noise Insertion Level
2.5
V
AGC CIRCUIT
I
24C
Charging Current
550
900
1200
A
I
24D
Discharge Current
12
20
26
A
C/D
Charging / Discharging Ratio
45
TUNER AGC
I
2
Sinked Current
1.2
1.9
2.6
mA
S
2
Current Slope
See FIgure 4
300
A/dB
AFC
AFC Slope
See Figure 2, refer to test circuit
20
mV/kHz
FM SOUND DEMODULATION
V
16S
Input Sensitivity
-3dB FM detected signal
60
V
AMR
Amplitude Modulation Rejection
Note 3
40
53
dB
R
16
Limiter Input Resistance
1.2
k
AUDIO OUTPUT (PIn 11)
V
11
Detected Audio Output Signal
500
mV
RMS
THD
Total Harmonic Distortion
0.2
1
%
S
N
Signal to Noise Ratio
Note 4
68
dB
R
11
Internal Deemphasis Resistor
700
1000
1400
VOLUME CONTROL
V
C range
Control Range
See Figure 3
80
dB
82
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4.
T
B
L
Notes : 1.
S
N
= 20 Log
10
V
OUT
black to white
V
N
(
RMS
)
at BW = 5MHz
2. Video carrier relative level = 0dB, Chroma subcarrier relative level = -3.2dB, Sound carrier relative level = -20dB.
3. AMR = 20 Log
V
11
(
mV
RMS
)
V
AM
(
mV
RMS
)
(dB) where V
AM
= output amplitude in AM for f
m
= 1kHz and m = 30%
4.
S
N
= 20 Log
V
11
(
mV
RMS
)
V
N
(
mV
RMS
)
(dB)
TDA8222
4/9
ELECTRICAL CHARACTERISTICS (continued)
(T
amb
= 25
o
C, V
CC
= 9V, IF input = 10mV
RMS
top sync, D = 90%, Video BW = 5MHz,
Sound carrier input : 5.5MHz, 10mV
RMS
, f
m
= 1kHz, Audio BW = 20kHz,
f =
25kHz,
Volume attenuation = 0dB, R
load
on Pin 12 = 1k
, unless otherwise specified)
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
AUDIO SWITCH
R
17
Input Resistance
40
65
k
C
Rtk
Crosstalk
70
80
dB
EXTHD
THD on External Signal
V
IN
= 2V
RMS
, Attenuation = 0dB
0.05
0.3
%
VIDEO SWITCH
V
DC 13-14
DC Input Level
No signal
1.6
1.9
2.2
V
V
S 13-14
Top Sync Clamp Level
1.8
V
V
12
DC Output Level
No signal
0.7
1.0
1.3
V
V
S 12
Top Sync Clamp Level
0.85
V
Crosstalk
55
dB
G
13-14 . 12
Gain from inputs to output
V
IN
= 1V
PP
5.5
6
6.5
dB
Output Swing
4.5
V
I
13-14
Input Current
V
13-14
= V
DC 13-14
+ 1.5V
1
5
A
VBW
Bandwidth
V
IN
= 1V
PP
15
MHz
SWITCHING INPUT
V
21 ext
External Input Selection Level
5
V
V
21 int
Internal Input Selection Level
2.5
I
21
Sourced Current
0
10
A
MUTE
V
15
Threshold Voltage
2.1
V
V
15
DC Level when mute disabled
High impedance controling circuit
2.8
V
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T
B
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TDA8222
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