WITH VIDEO AN D SO UN D SWITC H ES
.
3 ST A G E IF GAI N CO NT RO LL E D AM PLI F IER
.
SYNCHRONOUS VIDEO DEMODULATOR
.
TOP SYNC A G C CI RCUIT
.
WHIT E A N D B LACK NOIS E INVERTER
.
TUNER AGC OUTPUT FOR PNP TUNERS
(suitable also for MOSF ET tuners)
.
ANALOG AFC
.
FM DETECTOR
.
AUDIO AND VIDEO SWITCHES COMPATIBLE WITH SCART EUROPEAN NORM
.
DC VOLUME CO NTRO L
.
MUTE FUNCTION
TDA8222
VIDEO & SOUND IF SYSTEM
SHRINK DIP24
(Plastic Package)
DESCRIP TION
The TDA8222 is a video and sound IF circuit in
Shrink DIP24 pack age 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 SCA RT european norm.
PIN CONNECTIONS
TUNER AGC STARTING POINT ADJUSTMENT
TUNER AGC OUTPUT
V
CC
VIDEO SWITCH
BALANCED IF INPUT
BALANCED IF INPUT
AUDIO SWITCH OUTPUT
VOLUME CONTROL
V
CC
GROUND
1
2
3
4
5
6
7
8
9
ORDER CODE : TDA8222
24
23
22
21
20
19
18
17
16
AGC TIME CONSTANT
IF LC
IF LC
SWITCHING INPUT
AFC LC
AFC OUTPUT
DEMODULATED CVBS OUTPUT
EXTERNAL AUDIO INPUT
2nd IF SOUND INPUT
October 1993
FM REFERENCE TUNED CIRCUIT
DEMODULATED AUDIO OUTPUT
VIDEO SWITCH OUTPUT
10
11
12
15
14
13
2nd IF DECOUPLING INPUT + MUTE
INTERNAL VIDEO INPUT
EXTERNAL VIDEO INPUT
8222-01.EPS
1/9
TDA8222
BLOCK DIAG RAM
3
12423
22
20
17
11
2
5
6
9
8
Tuner
AGC
IF Amplifier
Band Gap
Voltage Re feren ce
D.C. Volume
Control
FM
Discri
Limiter
LP Filter
Reference
Amplifier
Mute
AFCAGC
Video
Ampli fier
White and
Black Noise Inverter
6dB
6dB
19
18
4
14
12
13
TDA8222
151610
21
7
8222-02.EPS
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 inverter
- AGC circuit which operates on top sync level
- Analog AFC circuit
- FM discriminator
- Mute function
- Video and audio switches
- DC volume control
IF Amp lifier
It consists of three cascaded AC coupled differential gain stages. The gain of each amplifier is controlled by the AGC volt age. The global AG C range
is more than 60dB. Thanks to the internal AC
coupling no DC feedback is required.
Demo du lation
It is a quasi-synchronous type with passive carrier
regeneration done by an ext ernal tuned circuit, a nd
a limiter amplifier.
Video A mp lifier
The video amplifier provides a 2V
video signal to
PP
the output with a good phase and amplitude frequency 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 sync hronization
on parasitic signals.
AGC Circuit
The AGC detector operates on top sync level, an
external capacitor o n Pin 24 controls t he tim e co nstant.
The voltage on this capacitor is converted into a
current to control the amplifier stage.
2/9
TDA8222
T u ner AG C
It sinks a current to cont rol the gain of the tuner RF
amplifier . Its star ting point is adjusted by an external
potentiometer (Pin 1).
AFC Circui t
It is a FM demodulator stage which delivers on
Pin 19 a current proportional to the frequency difference between the IF input signal and the reference 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 quadrature demodulator. The deemphasis filter is built
with an internal resistor and an external capacitor
on Pin 1 1.
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 ex tern al sources can be sent to
the outputs (Pin 12 for video and Pin 8 for audio).
The internal signals are select ed by a control l ev el
below 2.5V on Pin 21, the external o nes 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 maximum volume.
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
V
X
T
stg
T
oper
Supply Voltage 13.5 V
Tuner AGC V ol tage V
Storage Temperature -40, +150
Operating Temperature 0, +70
CC
V
o
C
o
C
8222-01.TBL
THERMAL DATA
Symbol Parameter Value Unit
R
th (j-a)
Junction-ambient Thermal Resistance Max. 75
ELECTRICAL CHARACTERISTICS
(T
= 25oC, VCC = 9V, IF input = 10mV
amb
Sound carrier input : 5.5MHz, 10mV
V olume attenuation = 0dB, R
Symbol Parameter Test Conditions Min. Typ. Max. Unit
SUPPLY
V
CC
I
CC
IF AMPLIFIER
R
22-23
C
22-23
G
R
DEMODULATED VIDEO OUTPUT (Pin 18)
V
A18
V
S18
BW Bandwidth See Figure 1 5 7 MHz
Voltage Operating Range 8.1 9 12.6 V
Supply Current I(3) + I(4), VCC = 9V 24 38 52 mA
Input Sensitivity Refer to test circuit 70 µV
Differential Input Resistance 1.5 kΩ
Differential Input Capacitance 2 pF
Gain Control Range 64 dB
Amplitude Top sync to white 1.8 2.1 2.4 V
Top Sync Level without output filter 1.6 1.9 2.2 V
load
RMS
on Pin 12 = 1kΩ, unless otherwise specified)
top sync, D = 90%, Video BW = 5MHz,
RMS
, fm = 1kHz, Audio BW = 20k Hz, ∆f = ± 25kHz,
o
C/W
8222-02.TBL
PP
8222-03.TBL
3/9
TDA8222
ELECTRICAL CHARACTERISTICS (continued)
(T
= 25oC, VCC = 9V, IF input = 10mV
amb
Sound carrier input : 5.5MHz, 10mV
V olume attenuation = 0dB, R
load
RMS
on Pin 12 = 1kΩ, unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
DEMODULATED VIDEO OUTPUT (Pin 18) (continued)
D
D
V
V
I
Differential Gain IF input = 5mV
G
Differential Phase 3 7 Degree
P
Residual Carrier Signal (RMS
18
value)
Residual 2nd Harmonic (RMS
18
value)
Internal Bias of Emitter Follower 3 5 mA
18
S/N Signal to Noise Ratio Note 1 55 dB
Intermodulation 1.07MHz Note 2 50 dB
V
V
V
V
White Noise Threshold Voltage See Figure 5 4.5 V
WTH
White Noise Insertion Level See Figure 5 3.2 V
WIL
Black Noise Threshold Voltage 1.3 V
BTH
Black Noise Insertion Level 2.5 V
BIL
AGC CIRCUIT
I
I
24C
24D
Charging Current 550 900 1200 µA
Discharge Current 12 20 26 µA
C/D Charging / Discharging Ratio 45
TUNER AGC
I
Sinked Current 1.2 1.9 2.6 mA
2
S
Current Slope See FIgure 4 300 µA/dB
2
AFC
AFC Slope See Figure 2, refer to test circuit 20 mV/kHz
FM SOUND DEMODULATION
V
Input Sensitivity -3dB FM detected signal 60 µV
16S
AMR Amplitude Modulation Rejection Note 3 40 53 dB
R
Limiter Input Resistance 1.2 kΩ
16
AUDIO OUTPUT (PIn 11)
V
Detected Audio Output Signal 500 mV
11
THD Total Harmonic Distortion 0.2 1 %
S
N
R
Signal to Noise Ratio Note 4 68 dB
Internal Deemphasis Resistor 700 1000 1400 Ω
11
VOLUME CONTROL
V
C range
Notes : 1.
Control Range See Figure 3 80 dB
black to white
S
= 20 Log 10
N
2. Video carrier relative level = 0dB, Chroma subcarrier relative level = -3.2dB, Sound carrier relative level = -20dB.
3. AMR = 20 Log
S
= 20 Log
4.
N
V
OUT
V
N (RMS)
( mV
V
11
RMS
( mV
V
AM
RMS
( mV
( mV
RMS
RMS
)
)
(dB)
V
11
V
N
at BW = 5MHz
)
(dB) where VAM = output amplitude in AM for fm = 1kHz and m = 30%
)
top sync, D = 90%, Video BW = 5MHz,
RMS
, fm = 1kHz, Audio BW = 20k Hz, ∆f = ± 25kHz,
top sync 3 7 %
RMS
110mV
220mV
RMS
8222-04.TBL
4/9
TDA8222
ELECTRICAL CHARACTERISTICS (continued)
(T
= 25oC, VCC = 9V, IF input = 10mV
amb
Sound carrier input : 5.5MHz, 10mV
V olume attenuation = 0dB, R
load
RMS
on Pin 12 = 1kΩ, unless otherwise specified)
Symbol Parameter Test Conditions Min. Typ. Max. Unit
AUDIO SWITCH
R
C
Input Resistance 40 65 kΩ
17
Crosstalk 70 80 dB
Rtk
EXTHD THD on External Signal V
VIDEO SWITCH
V
DC 13-14
V
S 13-14
V
V
DC Input Level No signal 1.6 1.9 2.2 V
Top Sync Clamp Level 1.8 V
DC Output Level No signal 0.7 1.0 1.3 V
12
Top Sync Clamp Level 0.85 V
S 12
Crosstalk 55 dB
G
13-14 . 12
Gain from inputs to output VIN = 1V
Output Swing 4.5 V
I
13-14
Input Current V
VBW Bandwidth V
SWITCHING INPUT
V
V
21 ext
21 int
I
External Input Selection Level 5 V
Internal Input Selection Level 2.5
Sourced Current 0 10 µA
21
MUTE
V
V
Threshold Voltage 2.1 V
15
DC Level when mute disabled High impedance controling circuit 2.8 V
15
top sync, D = 90%, Video BW = 5MHz,
RMS
, fm = 1kHz, Audio BW = 20k Hz, ∆f = ± 25kHz,
= 2V
IN
13-14
= 1V
IN
, Attenuation = 0dB 0.05 0.3 %
RMS
5.5 6 6.5 dB
15 MHz
= V
PP
DC 13-14
PP
+ 1.5V 1 5 µA
8222-05.TBL
5/9
T
TDA8222
TEST CIRCUIT
SWITCHED
VIDEO OU
DEMODULATED
VIDEO OUT
SWITCHED
AUDIO OUT
Ω
DEMODULATED
AUDIO OUT
500
10nF
Ω
Ω
10k
500
47nF
7
F
µ
1
CC
V
Ω
AFC OUT
Q = 80
38.9MHz
100kΩ100k
33pF
100nF
F
µ
1
10nF
4
3
White and Black
AFCAGC
Video
8
18
12
Ω
10nF
50
21
139
Noise Inverter
6dB
6dB
10nF
Ω
50
14
VIDEO
Amplifier
Control
D. C . Volum e
Ω
1k
22nF
GENERATOR
20 19
AUDIO
F
µ
4.7
Ω
Ω
5k
Ω
470
33pF
F
µ
1
2.7k
1 24 23 22
Amplifier
Reference
FM
Discri
IF Amplifier
Limiter
AGC
Tuner
LP Filter
2
5
6
16
15
Q = 80
38.9MHz
11 17
10
470nF 10pF
Mute
F
µ
1
Q = 80
5.5MHz
GENERATOR
100nF
6/9
10nF
10nF
IF VIDEO
Ω
100nF
Ω
50
50
INPUT
IF SOUND
INPUT
8222-03 .EP S
TDA8222
Figure 1 : Output Signal Bandwidth on Pin 18
Vout (dB)
0
-1
-2
-3
-4
-5
f (MHz)
-6
01 23 4 6 85
7
Figure 3 : Volume Control Attenuation versus
Voltage on Pin 9
Attenuation (dB)
0
-10
-20
-30
-40
-50
-60
-70
V
Pin 9
(V)
-80
012345
Figure 5 : Black and White Noise Inverter
Figure 2 : AFC Voltage versus Input Frequency
on Pin 19
AFC Output Voltage (V)
9
8
7
6
5
4
3
2
IF Frequency
1
0
38.5 38.7 38.9 39.1 39.3
8222-04.EPS
Figure 4 : Tuner AGC Output Current on Pin 2
Output Current (mA)
2
1.8
1.6
1.4
1.2
1
0.8
1
n
i
P
n
o
Ω
k
1
1
n
i
P
n
o
Ω
k
3
0.6
0.4
0.2
Diff Input Voltage (mV)
0
0.1 1 10
8222-06.EPS
(MHz)
1
n
i
P
n
o
Ω
k
5
8222-05.EPS
8222-07.EPS
V (V)
18
4.5
4
3.2
2.5
1.9
1.3
White spike noise clamp
Top white
White noise level insertion
Black Noise level insertion
Top synchronization
Black spike noise clamp
t
8222-08.EPS
7/9
L
TDA8222
TYPICAL APPLICAT ION (for B/G standard)
OUT
VOLUME
AUDIO
F
µ
1
CONTRO
OUT
VIDEO
OUT
AUDIO
SCART
10µF
VIDEO
470nF
IN
SCART
Ω
75
IN
AUDIO
SCART
S
V
Ω
100
BC237
OUT
VIDEO
SCART
Ω
68
Ω
220
Ω
H
µ
1
SAW
12
470nF
3
FILTER
1k
LC1
SIEMENS
OFWG1961
54
47nF
131415
8.2µH
470nF
Ω
Ω
180
1.2k
161718192021222324
3.3µH
33pF
Ω
2.7k
6 7 8 9 10
TDA8222
LC2
4.7µF
CF2
100nF
CF1
Ω
560
10nF
Ω
220
MUTE
100k
Ω
100nF
8/9
47nF
9.1V
Ω
39
F
µ
10
100nF
S
V
12V
I.F. INPUT FROM TUNER
10µH
µ
H
10
CC
V
Ω
47nF
10k
Ω
8.2k
1 2 3 4 5 11 12
Ω
27k
F
µ
10
AGC
TUNER
F
µ
1
Ω
220k
LC3
= 5.5MHz)
LC1 : TOKO BKAC-K1640HM
(f
Ω
100k
Ω
2.7k
= 38.9MHz)
C
LC2 & LC3 : TOKO KXCA-K1062A DX
(f
Ω
100k
C
CF1 : MURATA SFT5 . 5MA
CF2 : MURATA TPW04B
(5.5MHz filter)
AFC
CC
V
INPUT (12V)
SCART SWITCHI NG
(5.5 & 5.74MHz trap filter)
8222-09.EPS
PACKAGE MECHANICAL DATA
24 PINS - PLASTIC SHRINK
TDA8222
I
a1
Stand-off
L
b1
e3
b2
e
E
Z
b
D
Stand-off
24 13
F
112
Dimensions
Min. Typ. Max. Min. Typ. Max.
Millimeters Inches
A 3.3 0.130
a1 0.51 0.020
b 0.35 0.59 0.014 0.023
b1 0.2 0.36 0.008 0.014
b2 0.75 1.42 0.030 0.056
b3 0.75 0.030
D 23.11 0.910
E 7.95 9.73 0.313 0.383
e 1.778 0.070
e3 19.558 0.770
e4 7.62 0.300
F 6.86 0270
i 5.08 0.200
L 2.54 0.100
b3
PMSDIP24.EPS
SDIP24.TBL
Information furnished i s believed to be accurate and rel iabl e. However, S GS-THOMSON Microel ectroni cs assumes no responsibil ity
for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result
from its use. No licence is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics.
Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all
information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical components in life
support devices or systems without express written approval of SGS-THOMSON Microelectronics.
© 1994 SGS-THOMSON Microelec tronics - All Rights Reserved
2
Purchase of I
2
C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to
I
Australia - Brazil - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco
The Netherlands - Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips
2
C Standard Specifications as defined by Philips.
the I
SGS-THOMSON Microelectronics GROUP OF COMPANIES
9/9
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