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TDA8222
VIDEO & SOUND IF SYSTEM WITH VIDEO AND SOUND SWITCHES
. . . . . . . . . .
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 COMPATIBLE WITH SCART EUROPEAN NORM DC VOLUME CONTROL MUTE FUNCTION
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. PIN CONNECTIONS
TUNER AGC STARTING POINT ADJUSTMENT TUNER AGC OUTPUT V CC VIDEO SWITCH V CC BALANCED IF INPUT BALANCED IF INPUT GROUND AUDIO SWITCH OUTPUT VOLUME CONTROL FM REFERENCE TUNED CIRCUIT DEMODULATED AUDIO OUTPUT VIDEO SWITCH OUTPUT 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13
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
8222-01.EPS
October 1993
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TDA8222
BLOCK DIAGRAM
3 1 24 23 22 20
2
Tuner AGC
AGC
Reference Amplifier
AFC
19
5
IF Amplifier
Video Amplifier
6
Band Gap Voltage Reference
White and Black Noise Inverter
18 4
9 14 8 17 6dB 11
FM Discri Limiter LP Filter Mute
D.C. Volume Control 6dB 12
13
8222-02.EPS
TDA8222
10 16 15 21 7
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 Amplifier It consists of three cascaded AC coupled differential gain stages. The gain of each amplifier is controlled 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
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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 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 synchronization on parasitic signals. AGC Circuit The AGC detector operates on top sync level, an external capacitor on Pin 24 controls the time constant. The voltage on this capacitor is converted into a current to control the amplifier stage.
TDA8222
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 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 11. ABSOLUTE MAXIMUM RATINGS
Symbol VS VX Tstg Toper Parameter Supply Voltage Tuner AGC Voltage Storage Temperature Operating Temperature Value 13.5 VCC -40, +150 0, +70 Unit V V o C o C
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 maximum volume.
THERMAL DATA
Symbol Rth (j-a) Parameter Junction-ambient Thermal Resistance Max. Value 75
o
Unit C/W
ELECTRICAL CHARACTERISTICS (Tamb = 25oC, 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, unless otherwise specified)
Symbol SUPPLY VCC ICC IF AMPLIFIER R22-23 C22-23 GR VA18 VS18 BW Input Sensitivity Differential Input Resistance Differential Input Capacitance Gain Control Range Amplitude Top Sync Level Bandwidth Refer to test circuit 70 1.5 2 64 1.8 1.6 5 2.1 1.9 7 2.4 2.2 V k pF dB VPP V MHz Voltage Operating Range Supply Current I(3) + I(4), VCC = 9V 8.1 24 9 38 12.6 52 V mA Parameter Test Conditions Min. Typ. Max. Unit
DEMODULATED VIDEO OUTPUT (Pin 18)
8222-03.TBL
Top sync to white without output filter See Figure 1
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8222-02.TBL
8222-01.TBL
TDA8222
ELECTRICAL CHARACTERISTICS (continued) (Tamb = 25oC, 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, unless otherwise specified)
Symbol DG DP V18 V18 I18 S/N VWTH VWIL VBTH VBIL I24C I24D C/D I2 S2 AFC AFC Slope FM SOUND DEMODULATION V16S AMR R16 V11 THD S N R11 VC range
Notes : 1.
Parameter Differential Gain Differential Phase Residual Carrier Signal (RMS value) Residual 2nd Harmonic (RMS value) Internal Bias of Emitter Follower Signal to Noise Ratio Intermodulation 1.07MHz White Noise Threshold Voltage White Noise Insertion Level Black Noise Threshold Voltage Black Noise Insertion Level Charging Current Discharge Current Charging / Discharging Ratio Sinked Current Current Slope
Test Conditions IF input = 5mVRMS top sync
Min.
Typ. 3 3 1 2
Max. 7 7 10 20
Unit % Degree mV mV mA dB dB V V V V
DEMODULATED VIDEO OUTPUT (Pin 18) (continued)
3 Note 1 Note 2 See Figure 5 See Figure 5
5 55 50 4.5 3.2 1.3 2.5 900 20 45 1.9 300 20 60 53 1.2 500 0.2 1200 26
AGC CIRCUIT 550 12 A A
TUNER AGC 1.2 See FIgure 4 See Figure 2, refer to test circuit -3dB FM detected signal Note 3 2.6 mA A/dB mV/kHz V dB k mVRMS % dB 1400 dB
8222-04.TBL
Input Sensitivity Amplitude Modulation Rejection Limiter Input Resistance Detected Audio Output Signal Total Harmonic Distortion Signal to Noise Ratio Internal Deemphasis Resistor Control Range
40
AUDIO OUTPUT (PIn 11) 1
Note 4 700 See Figure 3
68 1000 80
VOLUME CONTROL
VOUT black to white S = 20 Log 10 at BW = 5MHz VN (RMS) N 2. Video carrier relative level = 0dB, Chroma subcarrier relative level = -3.2dB, Sound carrier relative level = -20dB. V11 ( mVRMS ) (dB) where VAM = output amplitude in AM for fm = 1kHz and m = 30% 3. AMR = 20 Log VAM ( mVRMS ) V11 ( mVRMS ) S = 20 Log (dB) 4. VN ( mVRMS ) N
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TDA8222
ELECTRICAL CHARACTERISTICS (continued) (Tamb = 25oC, 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, unless otherwise specified)
Symbol AUDIO SWITCH R17 CRtk EXTHD VDC 13-14 VS 13-14 V12 VS 12 G13-14 . 12 I13-14 VBW V21 ext V21 int I21 MUTE V15 V15 Threshold Voltage DC Level when mute disabled High impedance controling circuit 2.1 2.8 V V Input Resistance Crosstalk THD on External Signal DC Input Level Top Sync Clamp Level DC Output Level Top Sync Clamp Level Crosstalk Gain from inputs to output Output Swing Input Current Bandwidth External Input Selection Level Internal Input Selection Level Sourced Current 40 70 VIN = 2VRMS, Attenuation = 0dB No signal No signal 1.6 0.7 65 80 0.05 1.9 1.8 1.0 0.85 55 6 1 15 5 0 2.5 10 k dB % V V V V dB dB V A MHz V A
8222-05.TBL
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
0.3 2.2 1.3
VIDEO SWITCH
VIN = 1VPP V13-14 = VDC 13-14 + 1.5V VIN = 1VPP
5.5 4.5
6.5 5
SWITCHING INPUT
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38.9MHz Q = 80 100k 100k 1F 10nF 22 3 7
Tuner AGC Amplifier AGC Reference AFC
38.9MHz Q = 80 33pF 100nF 1F
AFC OUT
VCC
470 1F 2.7k 1 4 24 23 20 19 33pF
TDA8222
5k
TEST CIRCUIT
10nF
2
10nF
IF VIDEO INPUT
Video IF Amplifier Amplifier
White and Black Noise Inverter
5 18 DEMODULATED VIDEO OUT SWITCHED 10k 6dB 500 12 500 6dB
Limiter LP Filter Discri FM
50
6 8 10nF
AUDIO OUT
SWITCHED VIDEO OUT
IF SOUND
D.C. Volume Control
100nF
INPUT
16
50
Mute
15
47nF 10 11 17 9 14 13 21 DEMODULATED AUDIO OUT
470nF
10pF
100nF 5.5MHz Q = 80 1F 1k 10nF 50 10nF 50
4.7F
AUDIO GENERATOR
22nF
VIDEO GENERATOR
8222-03.EPS
TDA8222
Figure 1 : Output Signal Bandwidth on Pin 18
Vout (dB) 0 -1
Figure 2 : AFC Voltage versus Input Frequency on Pin 19
9 8 7 6 5 4 3 2
8222-04.EPS
AFC Output Voltage (V)
-2
-3 -4
-5
f (MHz)
-6
0
1
2
3
4
5
6
7
8
38.7
38.9
39.1
39.3
Figure 3 : Volume Control Attenuation versus Voltage on Pin 9
Attenuation (dB) 0 -10 -20 -30 -40 -50 -60
8222-06.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 0.6 0.4 Diff Input Voltage (mV) 0.2 0 0.1 1 10
1k on Pin 1 5k on Pin 1 3k on Pin 1
-80
0
1
2
3
4
5
Figure 5 : Black and White Noise Inverter
V18 (V)
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
8222-08.EPS
t
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8222-07.EPS
-70
VPin 9 (V)
8222-05.EPS
1 0 38.5
IF Frequency (MHz)
10H
10H
2.7k
3.3H
100nF
100k
8/9
1H AUDIO OUT 10F 9.1V SAW FILTER 3 SIEMENS OFWG1961 5 4 LC1 470nF 39 1 2 VOLUME CONTROL VIDEO OUT 1F 10k 47nF 47nF 1 2 3 4 5 6 7 8 9 10 11 12 47nF
TDA8222
I.F. INPUT FROM TUNER
VS
12V
100nF
VCC
10F
1k
AUDIO OUT SCART
TYPICAL APPLICATION (for B/G standard)
8.2k
AGC TUNER
10F
27k
TDA8222
24 23 22 21 20 19 LC2 18 17 16 15 14 13 470nF 220k 75 180 1.2k CF2 10nF 100k 560 CF1 100nF 100 470nF VIDEO IN SCART
1F
LC1 : TOKO BKAC-K1640HM
LC3
( f C = 5.5MHz)
2.7k 33pF 100k
8.2H
AUDIO IN SCART
LC2 & LC3 : TOKO KXCA-K1062ADX
( f C = 38.9MHz)
CF1 : MURATA SFT5.5MA (5.5MHz filter)
VS 4.7F
BC237 VIDEO OUT MUTE 220 220 68 SCART
CF2 : MURATA TPW04B (5.5 & 5.74MHz trap filter)
VCC
SCART SWITCHING INPUT (12V) AFC
8222-09.EPS
TDA8222
PACKAGE MECHANICAL DATA 24 PINS - PLASTIC SHRINK
a1
I
Stand-off
b1 E
b e3
b2
e Z
D
L
Stand-off
13
24
b3
PMSDIP24.EPS
1
12
Dimensions A a1 b b1 b2 b3 D E e e3 e4 F i L
Min. 0.51 0.35 0.2 0.75 0.75 7.95
Millimeters Typ. 3.3
F
Max.
Min. 0.020 0.014 0.008 0.030 0.030 0.313
Inches Typ. 0.130
Max.
0.59 0.36 1.42 23.11 9.73 1.778 19.558 7.62 6.86 5.08
0.023 0.014 0.056 0.910 0.383 0.070 0.770 0.300
SDIP24.TBL
0270 0.200 0.100
2.54
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility 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. (c) 1994 SGS-THOMSON Microelectronics - All Rights Reserved Purchase of I2C Components of SGS-THOMSON Microelectronics, conveys a license under the Philips I2C Patent. Rights to use these components in a I2C system, is granted provided that the system conforms to the I2C Standard Specifications as defined by Philips. SGS-THOMSON Microelectronics GROUP OF COMPANIES 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.
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