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U4479B
DVB-Cable IF Converter and Full Multi-Standard Video-/Sound IF Processing
Description
The U4479B is a bipolar circuit for the processing of cable DVB IF (Digital Video Broadcasting) and multistandard analog TV IF signals. The combi circuit processes QAM modulated IF signals, all TV video IF with negative/ positive modulation and the FM/ NICAM, AM sound IF signals. With 5 V supply voltage the IC is suitable for cable DVB receiver (set top boxes).
Features
D 5 V supply voltage; low power consumption D DVB signal processing with a converter for the 2nd IF;
VCO is controlled by an external PLL
D AGC with average detection for the QAM modulated
DVB signal, reference level is adjustable
D Active carrier generation by FPLL principle
(frequency-phase-locked-loop) for true synchronous demodulation in the "analog mode"
D Tuner AGC with adjustable take over point D Alignment-free quasi parallel sound (QPS) mixer for
FM/NICAM sound IF signals
D Switchable VCO frequency (33.4/38.9/43.0 MHz) D Very linear video demodulation, good pulse response
and excellent intermodulation figures
D Complete alignment-free AM demodulator with gain
controlled AF output
D Bandwidth of the output signal 10 MHz (-1 dB) in
DVB mode
D Separate SIF-AGC with average detection D Parallel operation of the AM demodulator and QPS
mixer (for NICAM-L stereo sound)
D Alignment-free AFC D AGC for negative modulation signals (peak sync
detection) and for positive modulation (peak white/ black level detector)
D Two IF inputs for DVB-/Analog Video IF D One sound IF input
Ordering Information
Extended Type Number U4479B-MFLG3 Package SO28 Remarks Taped and reeled
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
1 (11)
Preliminary Information
U4479B
Block Diagram
AFC Loop filter
25 AFC 5 IF 1 6 FPLL
19
23 VCO
22 20
I2C
PLL 18
13
CVBS or 2nd IF (DVB)
9 IF 2 10 14 Ref (DVB) Tuner 28 7 12
AGC: QAM neg./pos.
Control
17 16
Frequ. switch Standard Input select
Tuner AGC
11
15
27 1 SIF 26 2
FM
AM
VS
24
Band Gap 3
SIF AGC 4 8 21
95 9816
Figure 1. Block diagram
2 (11)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
U4479B
Pin Description
Vi,SIF Vi,SIF CRef
1 2 3
28 AGCRef 27 Vo,FM 26 Vo,AM 25 VAFC 24 VS 23 Vvco 22 Vvco 21 20 19 18 17 16 15
14530
CAGC,SIF 4 Vi,IF1 Vi,IF1 5 6
CAGC,IF 7 GND Vi,IF2 8 9
GND VLO LF Vtun Vfreq Vmod Vsw
Vi,IF2 10 Rtop Itun Vout Cbl 11 12 13 14
Figure 2. Pinning
Absolute Maximum Ratings
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Parameters Supply voltage Supply current Power dissipation, VS = 5.5 V Output currents Junction temperature Storage temperature Electrostatic handling *)
*) Equivalent to discharging a 200-pF capacitor through a 0-W resistor
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
Preliminary Information
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Symbol VS IS Ptot Iout Tj Tstg VESD Value 5.5 100 550 5 125 -25 to +125 tbd Unit V mA mW mA C C V 3 (11)
Pin Symbol Function 1, 2 Vi,SIF SIF input (symmetrical) 3 CRef Internal reference voltage (BG) 4 CAGC,SIF SIF-AGC (time constant) 5, 6AAAA IF1 input (symmetrical) Vi,IF1 7 CAGC,IF IF-AGC (time constant) 8 GND Ground 9, 10 Vi,IF2 IF2 input (symmetrical) 11 Rtop Take over point, tuner AGC 12 Itun Tuner AGC output current 13 Vout CVBS or 2nd IF output 14 Cbl Capacitor - black level detector 15 Vsw IF input selector switch 16 Vmod Modulation switch 17 Vfreq VCO frequency switch 18 Vtun External VCO tuning voltage 19 LF Loop filter 20 VLO Local oscillator output voltage 21 GND Ground 22, 23 Vvco VCO circuit (symmetrical) 24 Vs Supply voltage 25 VAFC AFC output 26 Vo,AM AF output - AM sound 27 Vo,FM Intercarrier output 28 AGCRef AGC reference for DVB operation
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VS = 5 V, Tamb = +25C
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Thermal Resistance Operating Range
Electrical Characteristics
U4479B
4 (11) Parameters Test Conditions / Pins DC supply Supply voltage Supply current Video IF- and DVB IF inputs Input sensitivity, RMS value Input impedance See note 1 Input capacitance See note 1 Video IF AGC (negative/ positive modulation) IF gain control range AGC capacitor Black level capacitor DVB AGC (QAM modulation) IF gain control range IF2 output voltage Pin 13 = 1.8 Vpp Tuner AGC Available tuner AGC current Allowable output voltage IF slip - tuner AGC Current Itun: 10% to 90% IF input signal for minimum take over point IF input signal for maximum take over point Variation of the take over DTamb = 55C point by temperature IF AGC: Gv = 46 dB Junction ambient Supply voltage range Ambient temperature Parameters (when soldered to PCB) Parameters Symbol Gv CAGC CBL
Preliminary Information
Dvin
Symbol RthJA Symbol VS Tamb Vout
GIF
Itun
Rin Cin
VS IS
vin
vin
Gv
vin
Min.
0.3
4.5
40
60
60
1
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98 Value 4.5 to 5.5 0 to +85 Value 75 Typ. 65 2.2 100 1.2 2 5.0 80 65 80 2 8 2 Max. 13.5 10 4 120 5.5 100 3 4 Unit K/W Unit V C Unit mV V dB mV mA V mA kW pF
mV
dB dB dB
mF
nF
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VS = 5 V, Tamb = +25C
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98 Local oscillator output signal Local oscillator control signal CVBS and 2nd IF output Output current -source -sink Output resistance Output amplitude DVB signal CVBS signal Difference of the CVBS signals DC output voltage Sync level Zero carrier level for negative modulation (Ultra white level) Zero carrier level for positive modulation (Ultra black level) Supply voltage influence on the ultra black- and ultra white level Bandwidth (-1 dB) of 2nd IF, in DVB mode Frequency response over AGC range Differential gain error Differential phase error Intermodulation 1.07 MHz Video signal-to-noise ratio Residual vision carrier fundamental wave 38.9 MHz and second harmonic 77.8 MHz Oscillator drift (free runing) as function of temperature Parameters FPLL and VCO Max. oscillator frequency Capture range
Electrical Characteristics (continued)
See note 3 Weighted , CCIR-567
RL 1 kW, CL 50 pF
L mode
DVB mode B/G mode B/G mode
Between B/G and L
See note 1 Peak to peak value
For carrier generation fvco = 38.9 MHz Cvco = 8.2 pF See note 2, DTamb = 55C, Cvco = 8.2 pF, fvco = 38.9 MHz Internal control loop switched off Internal control loop switched off
Test Conditions / Pins
Preliminary Information
Symbol
Dvo,vid
DV/V
LOout
Df/DT
Vsync VDC
Dfcap
Rout vo,vid
Iout
S/N vres1
VDC
aIM
vtun
fvco
DG DP
DB
B
Min.
1.4
1.6 1.8
0.5
52 56
10
70
2
Typ.
1.14
100
2.2 1.2 3.4
1.8 2.0
2 2 60 60 5
1
U4479B
Max.
-0.3
5 4 100
2.0
2.0 2.2 10
4.5
15
5 5
MHz
MHz MHz
%/V
Unit
% deg dB dB mV
mA mA
mV
dB
V V %
%
W
5 (11) V V V V V
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VS = 5 V, Tamb = +25C
Electrical Characteristics (continued)
U4479B
6 (11)
Parameters Test Conditions / Pins AFC output Control slope Frequency drift by Related to the picture temperature carrier frequency Output voltage upper limit lower limit Output current SIF input Input sensitivity, Output signal: -3 dB RMS value Input impedance See note 1 Input capacitance See note 1 SIF - AGC IF gain control range AGC capacitor Intercarrier output FM (see note 4) DC output voltage Output resistance See note 1 Sound IF output voltage, 5.5 MHz output voltage RMS value vin = 10 mV Weighted signal-to-noise Reference signal: ratio: (CCIR 468) vin =10 mV; fmod = 1 kHz; FM dev. = 27 kHz tested with the double FM demodulator U2860B; B/G modulated IF signal Black screen: Channel 1/2 Grid pattern: Channel 1/2 Grey screen 50%: Channel 1/2 AF output AM (see note 5) DC output voltage Output resistance See note 1 AF output voltage, m = 54 % RMS value Total harmonic distortion m = 54% fmod = 1kHz, 12.5kHz Signal-to-noise ratio Reference: m = 54%, fmod = 1 kHz, 22 kHz low-pass filter IF input switch (Pin 15) Control voltage for HIGH: IF1 input active See note 6 LOW: IF2 input active Switching current Pin 15 to ground
Preliminary Information
Symbol Gv CAGC
DI/Df
VAFC
THD
VDC Rout voAF
IAFC
VDC Rout vout
Vsw
S/N
S/N
S/N S/N
Isw
Rin Cin
vin
VS-0.4
Min.
2.5
60
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98 60/57 60/58 54/52
0.2
Typ.
0.7 0.25
2.2 150 500
2 150 200
65 4.7
1.2 2
30 65 80 1
Max.
120
3.5 1.5 0.4 0.6 2
mA/kHz
Unit
mV
mV
V V mA
kW pF
mA
mF
dB
dB
dB dB
dB
%
%
W
W
V
V V V V
U4479B
Electrical Characteristics (continued)
VS = 5 V, Tamb = +25C
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See note 6 Vmod Imod 2.5 3.5 1.5 Pin 16 to ground 30
Parameters Modulation switch (pin 16): Control voltage for HIGH: neg. modulation LOW: pos. modulation Switching current Frequency switch (Pin 17) Control voltage for HIGH: fVCO = 38.9 MHz LOW: fVCO = 33.4/43 MHz (depends on Pin 16) Switching current
Test Conditions / Pins
Symbol
Min.
Typ.
Max.
Unit
mA
V V
V V
Vfreq
see also note 6
3.35
3.5 3.2
Pin 17 to ground
Ifreq
700
mA
Table of Switch Settings
Active IF input IF input switch (Pin 15)
IF 1 (Pins 5, 6) Pin 15 `high'
IF 2 (Pins 9, 10) Pin 15 `low'
Standard VCO frequency
DVB 43 MHz `high' `low'
BG 38.9 MHz `high' `high'
L 38.9 MHz `low' `high'
Modulation switch (Pin 16) Frequency switch (Pin 17)
L' 33.4 MHz (see note 7) `low' `low'
Notes
1. This parameter is given as an application information and it is not tested during production. 2. The oscillator drift is related to the picture carrier frequency, at external temperature-compensated LC circuit 3.
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 color carrier sound carrier 0 dB -6 dB -24 dB
4. 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) 5. Sound carrier SC = 32.4 MHz, modulated with fmod = 1 kHz, m = 54%; vin = 10 mV 6. Without control voltage `High Level' mode is automatically selected 7. For L': AFC is adjustable with external potentiometer
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
7 (11)
Preliminary Information
U4479B
Basic Application Circuit
8 (11)
Inter- carrier AM +5 V Frequ. C 13 C 14 R3 51 k W Loop filter 10 nF C 28 Standard VIFin AFC VCO Frequency Switching DVB Ref ext. Loop filter 3.3 nF R4 C 11 10 nF P3 2.2 k W L1 C 10 +12 V 8.2 pF 28 C4 2.2 mF C3 1 4 10 nF SIF 1 8 Sound filter 7 V Ref 4.7m F AGC Sound C5 2.2 mF C6 IF 1 C7 2.2 mF AGC Video IF 2 P1 10 k W C8 100 nF Black level Tuner AGC take over point 2 3 5 6 7 8 9 10 11 12 13 14 27 26 25 24 23 22 21 20 19 R5 R2 150 W C9 470 nF 18 10 nF P2 50 k W 17 16 15 C 26 50 k W 22 m F C 12 51 k W 10 nF C 27 10 nF
96 12279
Figure 3. Basic application circuit
U4479B
Preliminary Information
6 VIF filter 5 DVB filter
R1
50
W
1
IF
C1
2
10 nF
U4744B *
3
C2
10 nF
4
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
* not for new development
Tuner AGC current
CVBS or 2 nd IF current
U4479B
IM3 Measurements and Application Recommendations for DVB Operation
IM3 Measurement
For correct measurement of IM3 with the 2-carrier method, it is necessary to control the internal IF amplifier via an external voltage at Pin 7. The criteria for a correct value of the external control voltage is the output amplitude of 1.8 Vpp (or lower). Please note that each change of the input level requests a correction of the external gain control voltage at Pin 7 in order to achieve the 1.8-Vpp output level again. In this case, IM3 is nearly 43 dB, independent from the input level. With an output voltage of 1.5 Vpp only, the IM3 is about -50 dB. Anyway, if the output amplitude is more than 1.8 Vpp (specified), the IM3 will decrease rapidly. In the graphic below, IM3 is shown for two different conditions:
50 48 46 44 IM3 ( dB ) 42 40 38 36 34 32 30 40
14778
+5 V from DSP S852T to Pin 7
10 k 100 nF
14581
Figure 5.
External LO Application
If the internal VCO is not used, the LO can be fed unbalanced or balanced to the VCO Pins 22 and 23. The application shown below is generating an unbalanced LO signal by using a 36-MHz third-overtone quartz reference. The application circuit is taken from IQD Limited Crystal Product Data Book. The LO signal is fed unbalanced with 1 nF coupling capacity to Pin 22. Pin 23 has to be blocked to ground with an 1-nF capacitor. The typical LO amplitude is 100 dBV. The variation of the LO input amplitude should not exceed 5 dB (better: 3 dB). +5 V 10 k 100 pF
Vout = 1.5 Vpp
Vout = 1.8 Vpp
50
60
70
80
90
100
S852T 68 pF 1 nF to Pin 22 47 pF 560
14582
Input voltage (each carrier) ( dBmV )
490 nH 4.7 k 560
Figure 4. IM3 vs. IF input voltage and IF2out voltage Test conditions: input: f1 = 38 MHz, f2 = 39 MHz, LO = 43 MHz
Circuitry for External Gain Control
If the gain control of the IC is carried out by an external DSP, the internal charge pumps of the AGC (Pin 7) have to be overlapped by an external voltage source. The internal AGC currents are 20 A. Therefore, the minimum current capacity of the external voltage source should be 30 A or more. The circuitry shown in figure 5 takes some more current.
Figure 6.
Note: With external LO operation, Pin 18 (VCO tuning voltage) should be connected to the supply voltage, and Pin 20 (LO output) should not be connected to the PCB.
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
9 (11)
Preliminary Information
U4479B
Package Information
Package SO28
Dimensions in mm
18.05 17.80 9.15 8.65 7.5 7.3
2.35 0.4 1.27 28 16.51 15 0.25 0.10 0.25 10.50 10.20
technical drawings according to DIN specifications 13033
1
14
10 (11)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
U4479B
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 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
TELEFUNKEN Semiconductors Rev. A2, 14-Jan-98
11 (11)
Preliminary Information

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