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TELEFUNKEN Semiconductors
TDA4472-A
Video-IF (VIF) with FPLL Demodulation and Quasi Parallel Sound (QPS) Processing
Description
The TDA4472 is an integrated bipolar circuit for video/sound IF (VIF/SIF) signal processing in TV/VCR and multimedia applications. The circuit processes TV video IF signals with negative modulation (e.g. B/G standard) and the FM/NICAM sound IF signals.
Features
D 5 V supply voltage; low power consumption D Active carrier generation by FPLL principle (frequency-phase-locked-loop) for true synchronous demodulation D Very linear video demodulation, good pulse response and excellent intermodulation figures D VCO circuit is operating on picture carrier frequency D Alignment-free AFC without external reference circuit D VIF-AGC with peak sync detection D Tuner AGC with adjustable take over point D Alignment-free quasi parallel sound (QPS) mixer for FM/NICAM sound IF signals D Gain controlled intercarrier output signal (supports digital sound processing systems) D Separate SIF-AGC with average detection D Two independent SIF inputs D Package and pinning is fully compatible with the multistandard version TDA4470, simplifies the design of an universal IF module
Package
28 pin shrink-dual-inline-plastic (SDIP28)
Rev. A1: 26.07.1995
1 (14)
TDA4472-A
Offset comp. (optional) Loop filter VCO
TELEFUNKEN Semiconductors
FPL L
AFC
90 Video det.
6 VIF 7
VIF amp
CAGC
8
AGC (VIF)
11 Tuner 10 Take over point
Tuner AGC FM det.
Supply
27 SIF 2 28
SIF amp
Input switch
3
1
SIF 1
2
AGC (SIF)
5 CAGC
94 8719
Figure 1. Block diagram
2 (14)
Rev. A1: 26.07.1995
I I II I
I I
0
VCO + phase shift
I I I
II
I II I
I
26
18
20
21
II
19
AFC switch
22
AFC
I I I I I I I I I I I I I I I I I I I
12
Video
4,9,16
23
VS
17
CRef
24
Intercarrier (FM / NICAM)
I
TELEFUNKEN Semiconductors
TDA4472-A
component of the VCO signal. The video demodulator is designed for low distortion and large bandwidth. The demodulator output signal passes an integrated low pass filter for attenuation of the residual vision carrier and is fed to the video amplifier. The video amplifier is realized by an operational amplifier with internal feedback and 8 MHz bandwidth (-3 dB). An additional noise clipping is provided. The video signal is fed to VIF-AGC and to the video output buffer. This amplifier with 6 dB gain offers easy adaption of the sound trap. For nominal video IF modulation the video output signal at Pin 12 is 2 Vpp.
Circuit Description
Vision IF Amplifier
The video IF signal (VIF) is fed through a SAW filter to the differential input (Pin 6-7) of the VIF amplifier. This amplifier consists of three AC-coupled amplifier stages. Each differential amplifier is gain controlled by the automatic gain control (VIF-AGC). Output signal of the VIF amplifier is applied to the FPLL carrier generation and the video demodulator.
Tuner- and VIF-AGC
At Pin 8 the VIF-AGC charges/discharges the AGC capacitor to generate a control voltage for setting gain of VIF amplifier and tuner in order to keep the video output signal at a constant level. Therefore in case of all negative modulated signals the sync level of the demodulated video signal is the criterion for a fast charge/discharge of the AGC capacitor. The control voltage (AGC voltage at Pin 8) is transferred to an internal control signal, and is fed to the tuner AGC to generate the tuner AGC current at Pin 11 (open collector output). Take over point of the tuner AGC can be adjusted at Pin 10 by a potentiometer or an external DC voltage (from interface circuit or microprocessor).
Sound IF Amplifier and SIF-AGC
The SIF amplifier is nearly identical with the 3-stage VIF amplifier. Merely the first amplifier stage exists twice and is switchable by a control voltage at pin 3. Therefore with a minimal external expense it is possible to switch between two different SAW filters. Both SIF inputs features excellent cross-talk attenuation and an input impedance which is independent from the switching condition. The SIF-AGC is related to the average level of the FMcarrier and controls the SIF amplifier to provide a constant SIF signal to the QPS mixer.
FPLL, VCO and AFC
The FPLL circuit (frequency phase locked loop) consists of a frequency and phase detector to generate control voltage for the VCO tuning. In the locked mode the VCO is controlled by the phase detector and in unlocked mode the frequency detector is superimposed. The VCO operates with an external resonance circuit (L and C parallel) and is controlled by internal varicaps. The VCO control voltage is also converted to a current and represents the AFC output signal at Pin 22. A practicable VCO alignment of the external coil is the adjustment to zero AFC output current at Pin 22. At centre frequency the AFC output current is equal to zero. The optional potentiometer at Pin 26 allows an offset compensation of the VCO phase for improved sound quality (fine adjustment). Without a potentiometer (open circuit at Pin 26) this offset compensation is not active. The oscillator signal passes a phase shifter and supplies the in-phase signal (0C) and the quadrature signal (90C)of the generated picture carrier.
Quasi-Parallel-Sound (QPS) Mixer
The QPS mixer is realized by a multiplier. The SIF signal (FM or NICAM carrier) is converted to the intercarrier frequency by the regenerated picture carrier (quadrature signal) which is provided from the VCO. The intercarrier signal is fed via an output amplifier to Pin 24.
AFC Switch
The AFC output signal at Pin 22 can be controlled by a switching voltage at Pin 19. It is possible to switch off the AFC.
VCR Mode
For the VCR mode in a TV set (external video source selected) it is recommendable to switch off the IF circuit. With an external switching voltage at Pin 6 or 7 the IF amplifiers are switched off and all signal output levels at Pin 12, 24 are according to the internal DC voltage.
Video Demodulation and Amplifier
The video IF signal, which is applied from the gain controlled IF amplifier, is multiplied with the inphase
Internal Voltage Stabilizer
The internal bandgap reference ensures constant performance independent of supply voltage and temperature.
Rev. A1: 26.07.1995
3 (14)
TDA4472-A
Pin Description
Vi,SIF1 Vi,SIF1 VSW GND CAGC Vi,VIF Vi,VIF CAGC GND Rtop Itun Vo,vid NC NC 1 2 3 4 5 28 27 26 25 24 Vi,SIF2 Vi,SIF2 Rcomp NC Vo,FM VS VAFC VVCO VVCO Vsw LF Cref GND NC Pin 1, 2 3 4 5 6, 7 8 9 10 11 12 13 14 15 20 19 18 17 16 15
94 8835
TELEFUNKEN Semiconductors
Symbol Vi, SIF1 VSW GND CAGC Vi, VIF CAGC GND Rtop Itun Vo,vid NC NC NC GND Cref LF VSW Vvco VAFC VS VO, FM NC Rcomp Vi, SIF2
Function SIF1 input (symmetrical) Ground Input selector switch SIF-AGC (time constant) VIF input (symmetrical) VIF-AGC (time constant) Ground Take over point, tuner AGC Tuner AGC output current Video output Not connected Not connected Not connected Ground Internal reference voltage Loop filter AFC switch VCO circuit AFC output Supply voltage Intercarrier output Not connected Offset compensation SIF 2 input (symmetrical)
7 8 9 10 11 12 13 14
TDA4472
6
23 22 21
16 17 18 19 20, 21 22 23 24 25 26 27, 28
Figure 2. Pin configuration
4 (14)
Rev. A1: 26.07.1995
TELEFUNKEN Semiconductors
TDA4472-A
Symbol VS IS P Iout Vext Value 9.0 75 675 5 +4.5 +3.5 +13.5 VS +125 -25 to +125 300 Unit V mA mW mA V V V V C C V
Absolute Maximum Ratings
Reference point pin 4 (9, 16), unless otherwise specified Parameters Supply voltage Pin 23 Supply current Pin 23 Power dissipation, VS = +9 V Output currents Pin 12, 24, 25 External voltages Pin 1, 2, 5, 6, 7, 8, 10, 12, Pin 17, 18, 24, 26, 27, 28 Pin 20, 21 Pin 11 Pin 3, 19, 22 Junction temperature Storage temperature Electrostatic handling *) all pins
*)
Tj Tstg VESD
Machine model in accordance with ESD S5.2 standard.
Operating Range
Parameters Supply voltage range Ambient temperature Pin 23 Symbol VS Tamb Value 4.5 to 9.0 0 to +85 Unit V C
Thermal Resistance
Parameters Thermal resistance: junction-ambient, when soldered to PCB Symbol RthJA Value 55 Unit K/W
Electrical Characteristics
VS = +5 V, Tamb = +25C; reference point pin 4 (9, 16), unless otherwise specified. Parameters DC-supply Supply voltage Supply current VIF-input Input sensitivity (RMS value) Input impedance Input capacitance VIF-AGC IF gain control range AGC capacitor Switching voltage: VCR mode Switching current: VCR mode Rev. A1: 26.07.1995 Test Conditions / Pins Pin 23 Symbol VS IS Pin 6-7 for FPLL locked see note 1 see note 1 Pin 8 Gv CAGC VSW ISW 60 65 2.2 4.0 50 dB mF V mA 5 (14) vin Rin Cin 80 1.2 2 120 mVeff kW pF Min. 4.5 Typ. 5.0 65 Max. 9.0 75 Unit V mA
see note 2 see note 2
TDA4472-A
Parameters Tuner-AGC Available tuner-AGC current Allowable output voltage IF slip-tuner AGC IF input signal for minimum take over point IF input signal for maximum take over point Variation of the take over point by temperature FPLL and VCO Max. oscillator frequency Vision carrier capture range Oscillator drift (free running) as function of temperature Video output Output current - source - sunk Output resistance Video output signal Sync level Zero carrier level (ultra white level) Supply voltage influence on the ultra white level Video bandwidth (-3 dB) Video frequency response over the AGC range Differential gain error Differential phase error Intermodulation f = 1.07 MHz Video signal to noise ratio Residual vision carrier fundamental wave 38.9 MHz and second harmonic 77.8 MHz Lower limiting level Upper limiting level Ripple rejection AFC output Control slope Frequency drift by temperature
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Test Conditions / Pins Symbol Min. Pin 10, 11 see note 3 Itun 1 V11 GIF vin vin 0.3 8 Typ. 2 Max. 4 13.5 10 4 Unit mA V dB mV mV 2 3 dB
current Itun 10% to 90% Rtop = 10 kW (Vtop = 4.5 V) Rtop = 0 (Vtop = 0.8 V)
40
Tamb = 55C vin VIF-AGC: Gv = 46 dB Pin 18, 20, 21, 26 for carrier generation fvco fvco = 38.9 MHz fcap Cvco = 6.8 pF see note 4, f/T amb = 55C, Cvco = 6,8 pF, fvco = 38.9 MHz Pin 12 I12 see note 1 peak to peak value V8 = 3 V Rout vo,vid Vsync VDC V/V RL 1 kW, CL 50 pF B DG DP aIM S/N vres1
70 1.5
2 -0.3
MHz MHz %
2 1.8 2.0 1.2 3.4 1 6 8
5 3 100 2.2
mA mA W V V V %/V MHz dB % deg dB dB mV
2.0 2 2 60 60 2 5 5
see note 5 weighted, CCIR-567
52 56
10
below sync level above ultra white level see note 1 /pin 23/pin 12 Pin 22 related to the picture carrier frequency
Vlim1 Vlim2 RR I/f
400 600 35 0.7 0.25
mV mV dB mA/kHz %
0.6
6 (14)
Rev. A1: 26.07.1995
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Parameters Output voltage upper limit lower limit Output current AFC switch Control voltage: AFC "off" AFC "on" Switching current SIF inputs Input sensitivity (RMS value) Input impedance Input capacitance SIF - AGC Pin 5 IF gain control range AGC capacitor Intercarrier output-FM DC output voltage Output resistance Sound IF output voltage, RMS value (5.5 MHz output voltage) Weighted signal to noise ratio: (CCIR 468) Test Conditions / Pins Symbol VAFC IAFC Pin 19 see note 6 VSW ISW Pin 1-2, 27-28 vin Rin Cin Gv GAGC Pin 24 see note 1 vin = 10 mV VDC Rout vout 60 see note 7 0 3.5 Min. VS-0.4
TDA4472-A
Typ. Max. Unit V V mA
0.4 0.2
100 80 1.2 2 65 10 2 150 250
0.8 VS
V V mA mV kW pF dB mF V W mV
output signal at pin 24/25: -3 dB see note 1 see note 1
120
Ref. signal: vin = 10 mV, FM dev. = 27 kHz, fmod = 1 kHz, tested with the double FM demod. U2860B, B/G modulated VIF signal
Ripple rejection SIF input selector switch Control voltage input 1 active input 2 active Switching current
Black screen: Channel 1/2 Grid pattern: Channel 1/2 Grey screen 50%: Channel 1/2 see note 1 /pin 23/pin24 Pin 3 see note 8
S/N S/N S/N RR 35
60/58 54/52 60/57
dB dB dB dB
VSW ISW
2.0 0 100
VS 0.8
V V mA
Rev. A1: 26.07.1995
7 (14)
TDA4472-A
Notes 1. This parameter is given as an application information and not tested during production. 2. In VCR mode the VIF- and SIF path is switched off. 3. Adjustment of turn over point (delayed tuner AGC) with external resistor Rtop or external voltage Vtop possible. 4. The oscillator drift is related to the picture carrier frequency, at external temperature-compensated LC circuit. 5. a (1.07) = 20 log (4.43 MHz component/1.07 MHz component); a (1.07) value related to black-white signal input signal conditions: picture carrier 0 dB colour carrier -6 dB sound carrier -24 dB
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6. Without control voltage at pin 19 the "on" mode is automatically selected. 7. Picture carrier PC = 38.9 MHz; sound carrier SC1 = 33.4 MHz, SC2 = 33.16 MHz; PC/SC1 = 13 dB; PC/SC2 = 20 dB; PC unmodulated (equivalent to sync peak level). 8. Without control voltage at Pin 3 SIF input 1 is automatically selected.
SIF 2
Loop comp.
Intercarrier (FM/NICAM) +VS
AFC AFC switch Loop filter LVCO 150 W
10 k W NC 28 27 26 25 24 23 22 21
6.8 pF CVCO
CRef 2.2 mF 17 16 NC 15
470 nF 20 19 18
TDA4472
94 9292
1
2
3
4
5
6
7
8
9
10
11
12
13 NC
14 NC
10 mF SIF Input switch AGC (SIF) VIF
2.2 mF AGC (VIF)
10 k W
SIF 1
Tuner delay
Tuner AGC
Video
*)
External L/C circuit (VCO: 38.9 MHz) with TOKO coil 7KN (9 turns, 0.12 mm)
Figure 3. Test circuit
8 (14)
Rev. A1: 26.07.1995
*)
Rev. A1: 26.07.1995
Intercarrier (FM/NICAM) AFC AFC switch +12 V +5 V 51 kW 51 kW Offset comp. 10 nF 10 kW 8 28 25 23 27 26 24 22 7 D/K 21 SIF 2 NC 20 10 nF 6.8 pF SAW 2 *) LVCO CVCO 19 22 mF 10 nF S2 Loop filter 150 W CRef 470 nF 18 2.2 mF 17 16 NC 15
94 8721
TELEFUNKEN Semiconductors
1
10 nF
50 W 6 1 5 10 mF AGC (SIF) 5 SAW 1 SIF 1 S3 B/G SAW: VIF Input switch 2 3 4 6 VIF
2
10 nF
U4744B
TDA4472
7 8 9 2.2 mF AGC (VIF) Tuner AGC Tuner Video 10 11 12 13 NC 10 kW 14 NC
3
external L/C circuit (VCO 38.9 MHz) with TOKO coil 7KN (9 turns, 0.12 mm)
Figure 4. Basic application circuit
IFin
4
SAW driver
TDA4472-A
9 (14)
TDA4472-A
Internal Pin Configuration
1, 27 2, 28 2kW 2k W 3V 20 k W
94 8521
TELEFUNKEN Semiconductors
6 7 2kW 2k W 2.3 V 4.2 V
94 8524
Figure 5. Sound IF inputs (pin 1-2, 27-28)
Figure 8. Video IF input (pin 6-7)
3.5 V 60 k W 3 10 k W 8
94 8525
94 8522
Figure 6. Input selector switch (pin 3)
Figure 9. VIF-AGC time constant (pin 8)
3.5 V 6.5 k W 10 6kW
5
94 8526
94 8523
Figure 7. SIF-AGC time constant (pin 5)
Figure 10. Tuner AGC - take over point (pin 10)
10 (14)
Rev. A1: 26.07.1995
TELEFUNKEN Semiconductors
TDA4472-A
94 8527
11
18
2.75 V
94 8532
Figure 11. Tuner AGC - output (pin 11)
Figure 14. Loop filter (pin 18)
3.5 V
12 2.6 mA 19 10.5 k W
94 8528 94 8533
30 k W
Figure 12. Video output (pin 12)
Figure 15. AFC switch (pin 19)
7k W 17 3.5 V 20 21
7k W
94 8531
94 8534
Figure 13. Internal reference voltage (pin 17)
Figure 16. VCO (pin 20-21)
Rev. A1: 26.07.1995
11 (14)
TDA4472-A
TELEFUNKEN Semiconductors
94 8538
3.5 V 10 k W
22 26 10 k W
94 8535
Figure 17. AFC output (pin 22)
Figure 19. VCO offset compensation (pin 26)
100 W 24 1 mA
94 8536
Figure 18. Intercarrier output (pin 24)
12 (14)
Rev. A1: 26.07.1995
TELEFUNKEN Semiconductors
TDA4472-A
Dimensions in mm
95 10610
Figure 20. 28 pin shrink-dual-in line-plastic (SDIP28)
95 10610
Rev. A1: 26.07.1995
13 (14)
TDA4472-A
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to
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1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances ( ODSs). The Montreal Protocol ( 1987) and its London Amendments ( 1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC TELEFUNKEN microelectronic GmbH semiconductor division has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2 . Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency ( EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C ( transitional substances ) respectively. TEMIC can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC products for any unintended or unauthorized application, the buyer shall indemnify TEMIC against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. TEMIC TELEFUNKEN microelectronic GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2831, Fax number: 49 ( 0 ) 7131 67 2423
14 (14)
Rev. A1: 26.07.1995

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