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TDA8120B
MULTISTANDARD VIDEO AND SOUND IF SYSTEM
. . . . . . . . . . . . . .
GAIN CONTROLLED IF AMPLIFIER VIF OPERATING FREQUENCY UP TO 50MHz SYNCHRONOUS DETECTOR WHITE SPOT INVERTER VERY LOW DIFFERENTIAL ERROR VERY LOW PHASE ERROR INTERNAL AGC SWITCH (B/G - L) AGC TOP. SYNCH. FOR STANDARD B/G AGC TOP WHITE FOR STANDARD L QUASI SPLIT SOUND FOR STANDARD B/G SOUND DETECTOR FOR STANDARD L VIDEO MUTING FACILITY SEPARATED SOUND OUTPUT OPERATES WITHOUT EXTERNAL GATING PULSE
The Sound IF section acts as a Quasi Split Sound (QSS) subsystem in B/G transmission and allows a second Sound IF with high rejection of the video information. The DC switch can modify the Sound IF configuration to process AM modulated Sound signals (L). The TDA8120B is assembled in a 24 pin dual in line power package.
DESCRIPTION The TDA8120B is a monolithic IC for TV video IF and Sound IF amplification and demodulation that can operate with all the TV standards. The Video IF section can handle negative (B/G) or positive (L) modulated video signals by means of DC switching. PIN CONNECTIONS
AF AM OUT CARRIER TUNING 3 SUPPLY VOLTAGE VS1 2nd IF SOUND OUT (QSS) GND 7 VIDEO OUTPUT SUPPLY VOLTAGE VS2 AGC TIME CONSTANT T 2V CARRIER TUNING 12 13 8 9 10 11 18 17 4 5 6 22 21 1 2 24 23
DIP24 (Plastic Package) ORDER CODE : TDA8120B
AGC TIME CONSTANT T 2S AGC TIME CONSTANT T 1S STANDARD SWITCH QSS OR AM INPUT
20 19 GND
VIDEO IF INPUT 16 15 14 AGC TIME CONSTANT T 1V AND VIDEO MUTING
8120B-01.EPS
TUNER AGC OUTPUT TUNER AGC DELAY
October 1993
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TDA8120B
BLOCK DIAGRAM
11 12 SSW 22 18 16 17 VIF AMP (3 STAGES) STANDARD SWITCH (B/G or L) SSW LIMITER PHASE SHIFTER (0 or 180) VOLTAGE REGULATION 4 9
VIDEO DEMOD. AND BUFFER
WHITE SPOT INV. NOISE INVERT VIDEO PREAMP.
8
VIDEO SECTION 14 13 10 19 20 21 1st SIF AMP. (3 STAGES) BUFFER AGC AMPLIF. AND AGC DELAY TOP SYNC CLAMP or TOP WHITE CLAMP MIN. VIDEO DETECTOR SSW
7 15
LIMITER AND PHASE SHIFTER (90)
2nd SIF DEMOD. SSW
5 6
23 24 1
AGC AMPLIF. AND AGC DELAY
AM or AGC DETECTOR SSW
LIMITER
SOUND SECTION
2
3
ABSOLUTE MAXIMUM RATINGS
Symbol V4, V9 I8, I5, I1 I22, I15 Ptot Tstg, Tj V14 Supply Voltage Vs Video Out, QSSout, AF AM Out, DC Output Current Pin 22 and Pin 15 Input Current Total Power Dissipation (Tamb = 70 C) Storage and Junction Temperature Voltage at Pin 14 Parameter Value 15 10 1 2 - 40 to 150 Vs Unit V mA mA C
8120B-01.TBL 8120B-02.TBL
W
THERMAL DATA
Symbol R th j-amb Thermal Resistance Parameter Max Value 40 Unit C/W
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8120B-02.EPS
TDA8120B
ELECTRICAL CHARACTERISTICS (VS = 12V, Tamb = 25C)
Symbol Vs Is V8 H V8 L V8 V8 V8 - I8 I8 I14 S/N VI B V16-17 V8 dG d dIM Ri Ci Parameter Supply Voltage (Pins 4 and 9) Supply Current Top White Level Top Synchronous Level Video Output B/G Video Output L Video Output Variation between Standards B/G and L Output Current Input Current Tuner AGC Current Capability Signal to Noise Ratio AGC Range Bandwidth Input Sensitivity for Full Output Signal Carrier Leakages Differential Gain Differential Phase Intermodulation Product 1.07MHz Input Resistance (between Pins 16 and pin 17) Input Capacitance (between Pins 16 and pin 17) Input Sensitivity for Full Output Signal (between Pins 20 and 21) AGC Range Output Voltage Standard B/G Output Current Small Signal Output Impedance (QSS) Input Resistance (between Pin 21 and Pin 20) Input Capacitance (between Pin 21 and Pin 20) Noise Ratio QSS (after SIF limitation and FM demodulation) FO = 5.50MHz FO = 5.74MHz Output Voltage Standard L Output Current AF Output Impedance (L) Noise Ratio AM Standard L R Channel Missing V5 = 1dB, R Channel Missing R L = 600, AC Coupled, FO = 5.5MHz FO = 5.5MHz or FO = 5.74MHz 1.5 2 Channel R or Channel L Switched off Fm = 1kHz, f = 30kHz Carrier Modulated with Syncs. Pulses Only. CCIR 468-2 Recommendant 60 100 2.5 50 Test Conditions Min. Typ. Max. 10.8 VI = 0 VI = 0, RL = 1.5k Modulation Depth, D = 90%, R L = 1.5k R L = 1.5k, M = 100% M = 100% R L = 1.5k 2 4.5 B = 5MHz, D = 90% V8 = 1dB, D = 90% V8 = - 3dB, D = 90% D = 90% Fo = 38.9MHz Fo = 77.8MHz Subcarrier Modulated Staircase Video Signal, D = 90% Subcarrier Modulated Staircase Video Signal, D = 90% Video Carrier Relative Level = 0dB Chroma Subcarrier Relative Level = - 3.2dB Sound Carrier Relative Level = - 20dB 50 60 7 50 20 50 10 10 50 5.5 2.7 2.2 2.2 12 120 6 3 3 3 2 4 13.2 6.5 3.3 3.4 3.4 Unit V mA V V Vpp Vpp % mA mA mA dB dB MHz V mV mV % degree dB VIDEO IF SECTION VI = 10 mVRMS (black field), FO = 38.9MHz ; unless otherwise specified
1.5 2
k pF
QUASI SPLIT SOUND CHANNEL OR FRENCH SOUND CHANNEL (see notes 1 and 2) V20-21 Vi V5 I5 Z5 Ri Ci S/N 50 V dB mVRMS mA k k pF dB 60 58 0.58
50 BN = 20kHz 46
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8120B-03.TBL
V1 I1 Z1 S/N
0.7 2.5
1
VRMS mA dB
TDA8120B
ELECTRICAL CHARACTERISTICS (continued)
Symbol Parameter Test Condition s Min. Typ. Max. Unit QUASI SPLIT SOUND CHANNEL OR FRENCH SOUND CHANNEL (see notes 1 and 2) d V22 V15 Distorsion B/G Operation L Operation Video Muting 2 0 8 2 5 0.8 VS % V V V
8120B-04.TBL 8120B-03.EPS
Notes : 1. QUASI SPLIT SOUND CHANNEL Video carrier relative level = 0dB f = 38.9MHz f = 0 Sound carrier relative level = 13dB (mono or L) f = 33.4MHz Sound carrier relative level = -20dB (R) f = 33.16MHz VI = 10mV Video carrier modulated with syncs ; V22 = 2V, unless otherwise specified. 2. FRENCH SOUND CHANNEL VI = 10mV (Carrier level) ; fo = 39.2MHz ; Fm = 1kHz ; m = 80% ; V22 = 0.8V, unless otherwise specified.
TEST CIRCUIT
IF IN
SAW FILTER V15 AGC delay adj. VIF QSS (B/G) or AM (L) V 22 C5 C6 C8 P1 AGC OUT 22 21 20 19 18 17 16 15 14 13
24
23
TDA8120B
1
2 C1
3
4
5 C3
6
7 C4
8
9
10
11 C2 C7 L2
12
AF AM OUT
38.9MHz
5.50MHz OUT 5.74MHz OUT
VIDEO OUT
38.9 or 32.7MHz VS
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TDA8120B
CIRCUIT OPERATION The TDA8120B (see block diagram) consists of a video section and a sound section. The integration of both sections on the same chip requires a high isolation at IF frequencies. This is achieved by physically separating the two sections, with separate power supplies and ground pins. In addition, special care has been taken in the choice of pad positions for the IF inputs and sound/video outputs. The video section consists of three AC-coupled IF stages with more than 60dB AGC range, flat amplitude/frequency response from 10 to 85MHz and linearized phase slope from 30 to 50MHz. Video carrier regeneration is performed by a tuned limiter. The carrier is then applied to the video demodulator through a special circuit which switches the carrier phase from 0 to 180so that the video polarity can be maintained constant when the standard switches from B/G to L. A noise inverter and a white spot inverter are included to eliminate ultra-black and white pulses. A top sync or a top white clamping circuit and a minimum DC video component detector are implemented by two double comparators the characteristics of which may be controlled by an external control input to adapt to the modulation type for each standard. The voltage at the output of the two comparatorsis memorized by an externalcapacitor and used to drive the AGC network, which allows an input regulation of the video carrier from less than 100V to 100mV. A delayed control storage with current output for the turner AGC completes the video section. The sound section consists of three IF stages with the same characteristicsas the video IF stages and an identical network to control and set the gains of the three IF amplifiers. The output of the third IF stage feeds the AM/AGC detector and the QSS section. The AM/AGC detector consists of a wideband limiter for AM sound regeneration or video carrier regeneration used to feed the synchronous multiplier and consequently to obtain the AM demodulated audio signal. In addition, a DC voltage proportional to the peak-to-peak value of the video carrier is produced. Two comparators complete the sound AGC loop. The subsequent QSS section consists of a reference amplifier tuned to the video IF which buffers a wideband limiter to reject completely the video AM information withou t introducing incidental phase modulation (IPM). Following the limiter there are a 90 phase shifter and a linear-to-logarithmic converter which drives a linear multiplier as a demodulator for the intercarrier 2nd sound IF. This quadrature multiplier rejects all video components transmitted in DSB that is low frequency components of the video signal. In addition to the sound and video sections, the TDA8120B includes a block for standard switching (B/G or L) controlled by a TTL-compatible input.
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TDA8120B
PACKAGE MECHANICAL DATA 24 PINS - PLASTIC DIP
a1 I L
b1 b b2 e3 e E
D
24
13
F
1
12
Dimensions a1 b b1 b2 D E e e3 F i L
Min.
Millimeters Typ. 0.63 0.45 1.27
Max.
Min.
Inches Typ. 0.025 0.018 0.050
Max.
0.23
0.31 32.2 16.68 2.54 27.94 14.1 4.445 3.3
0.009
0.012 1.268 0.657 0.100 1.100 0.555 0.175 0.130
DIP24.TBL
15.2
0.598
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 noti ce. 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 confo rms 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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PM-DIP24.EPS

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