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U4476B
IF Amplifier / Converter for DVB (Cable)
Description
The U4476B is a bipolar circuit for the processing of DVB-Cable IF signals (Digital Video Broadcasting). The amplifier/ converter is suitable for QAM modulated IF signals (1st IF) and provides the gain controlled 2nd IF. With 5 V supply voltage the IC allows application in RF/IF front ends for DVB-Cable receivers (set top boxes).
Features
D Gain controlled amplifier for the 1st IF (36 MHz) D IF converter for the 2nd IF (7 MHz);
VCO circuit is controlled by external PLL
D Internal AGC with average detection for the QAM
modulated DVB signal, reference level is adjustable
D 5 V supply voltage; low-power consumption
Package: 28-pin small outline plastic package (SO28)
D Bandwidth of the output signal: 10 MHz (-1 dB)
Block Diagram
I2C 23 5 IF 1 6 VCO 18 13 2nd IF 9 IF 2 Ref (DVB) 10 28 7 Tuner 12 22 20 PLL
AGC: QAM
Tuner AGC
11 VS 24 Band Gap 3 8 21
12703
Control
15
Input select
Figure 1. Block diagram
TELEFUNKEN Semiconductors Rev. A2, 15-Jan-98
1 (7)
Preliminary Information
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*) Equivalent to discharging a 200-pF capacitor through a 0-W resistor
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21 22, 23 24 25 26 27 28 4 5, 6 7 8 9, 10 11 12 13 14 15 16 17 18 Pin 1, 2 3 19 20 GND Vvco VS NC NC NC AGCRef Symbol NC CRef Remarks Taped and reeled, 2000 pcs NC LOout NC Vin1 CAGC GND Vin2 Rtop Itun Vout NC Vsw NC NC Vtun Function Not connected Capacitor for internal band gap reference voltage Not connected IF input 1 (symmetrical) DVB AGC (time constant) Ground IF input 2 (symmetrical) Take-over point, tuner AGC Tuner AGC output current Output signal (2nd IF) Not connected IF input selector switch Not connected Not connected Input for the external VCO tuning voltage Not connected Local oscillator output (reference signal) Ground VCO circuit (symmetrical) Supply voltage Not connected Not connected Not connected External reference voltage (comparator DVB AGC)
Absolute Maximum Ratings
Pin Description
Ordering Information
U4476B
2 (7) Supply voltage Supply current Power dissipation, VS = + 5.5 V Output currents Junction temperature Storage temperature Electrostatic handling *) CAGC 7 Extended Type Number U4476B-MFLG3 Rtop Vin2 Vin2 GND CRef Vin1 Itun 12 NC Vout 13 NC NC NC Vin1 5 10 14 11 9 8 6 4 3 2 1
Figure 2. Pinning
Parameters
14529
Preliminary Information
17 NC 18 Vtun 19 NC 15 Vsw 16 NC 21 GND 22 Vvco 23 Vvco 24 VS 25 NC 26 NC 20 LOout 27 NC 28 AGCRef Package SO28 Symbol VS IS Ptot Iout Tj Tstg VESD
TELEFUNKEN Semiconductors Rev. A2, 15-Jan-98 Value 5.5 100 550 5 125 -25 to +125 tbd Unit V mA mW mA C C V
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VS = 5 V, Tamb = 25C
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Thermal Resistance Operating Range
Parameters Junction ambient when soldered to PCB Supply voltage range Ambient temperature Parameters Symbol RthJA Symbol
TELEFUNKEN Semiconductors Rev. A2, 15-Jan-98
Electrical Characteristics
Parameters Test Conditions / Pins DC supply Supply voltage Supply current IF inputs Input sensitivity, rms value Input impedance See note 1 Input capacitance See note 1 DVB AGC (QAM modulation) IF gain control range IF2 output voltage Pin 13 = 1.8 Vpp VCO Oscillator frequency Tuning range fvco = 43 MHz Cvco = 8.2 pF Local oscillator output signal fvco = 43 MHz Cvco = 8.2 pF Local oscillator control fvco = 43 MHz signal Cvco = 8.2 pF 2nd IF output Output current source Output current sink Output resistance See note 1 Output amplitude Peak-to-peak value DC output voltage Bandwidth of 2nd IF (-1 dB) RL 1 kW, CL 50 pF Frequency response over AGC range IF input switch Control voltage See also note 2, Input 1 is active `high' (IF1 active, Pin 5-6) Input 2 is active `low' (IF2 active, Pin 9-10) Switching current (Pin 15 to ground)
Preliminary Information
VS Tamb
Symbol LOout
Dftun
Rout vo,vid
Iout
VSW VSW ISW
vtun
DB
fvco
vin Rin Cin
VS IS
Gv
B
Min.
2.5
1.6
0.5
4.5
10
60
2
4.5 to 5.5 0 to +85
Value 75
Value
1.5
Typ.
100
1.8 2.2
2.7
80 1.2 2
5.0 80
30
43
65
U4476B
Max.
5 4 100 2.0
120
5.5 100
3.5 1.5
2.0
4.5
60
Unit K/W
Unit
V C
Vrms kW pF
V V MHz dB
MHz MHz
Unit
mA
mV
V mA
mA
dB V V
W
V
3 (7)
U4476B
Electrical Characteristics
Vs = 5 V, Tamb = +25C
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Current Itun: 10% to 90%
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 (Pin 28 open)
Test Conditions / Pins
Symbol Itun Vout vin vin
Min. 1 0.3
Typ. 2 8
Max. 4 13.5 10 4
Unit mA V dB mV mV dB
DGIF
40
DTamb = 55C IF AGC: Gv = 46 dB
vin
2
3
Notes: 1. This parameter is given as an application information and not tested during production. 2. Without external control voltage (pin not connected) the input 1 is automatically selected.
Basic Application Circuit
DVB Ref VS VCO Frequency VCO Tuning Input Switch
10 nF 50 kW
22 mF
+12 V 28 27 26 25 24
8.2 pF 23 22 21 20 19 18 17 16
10 nF 15
2.2 mF
U4476B
1 2 3 4 5 IF 1 6 7 8 9 IF 2 10 kW Tuner AGC take over point 10 11 12 13 14
10 nF 50 W IF 2 10 nF 3 10 nF 4 7 2.2 mF SAW 1 2.2 mF AGC
1
8
U4744B
*) 6 SAW 2 5
Tuner 2 nd IF AGC current
13900
*)
U4744B:
SAW driver, device phased out, not for new development
Figure 3.
4 (7)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A2, 15-Jan-98
U4476B
IM3 Measurements and Application Recommendations
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: from DSP S852T to Pin 7 +5 V
*
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
50 48 46 44 IM3 ( dB ) 42 40 38 36 34 32 30 40
14778
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, 15-Jan-98
5 (7)
Preliminary Information
U4476B
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
6 (7)
Preliminary Information
TELEFUNKEN Semiconductors Rev. A2, 15-Jan-98
U4476B
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, 15-Jan-98
7 (7)
Preliminary Information

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