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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 Rev. A2, 23-Apr-99 1 (7) Preliminary Information AAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA AA *) Equivalent to discharging a 200-pF capacitor through a 0-W resistor AAAAAAAAAAA A AA AAAAAA A A AAAAAAAAAAAAAAAA AAAAAAAAAAA A A AAAAAAAAAAAAAAAA AA A AAAAAAAAAAAAAAAA AA AA AAAAAAAAAAAAAAAA AAAAAA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAA AAAAAA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AAAAAAAAAAA A AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AAAAAA AAAAAAAAAAAAAAAA AA A AAAAAAAAAAA A A AA AAAAAAAAAAAAAAAA AAAAAA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA AAAAAAAAAA A AA A AAAAAAAAAAAAAAAA AAAAAA AAAAAAAAAAAAAAAA AA AAAAAAAAAAAAAAAA AA 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 Value 5.5 100 550 5 125 -25 to +125 tbd Rev. A2, 23-Apr-99 Unit V mA mW mA C C V AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AA A AAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AA A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A A A A A A AA A A A AA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A A A A A A AA A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA A A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AA A A AA A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A A A A A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAA A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A A A A A AAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A AA A A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A A A A A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Rev. A2, 23-Apr-99 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AAAAA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA AA Thermal Resistance Operating Range Parameters Junction ambient when soldered to PCB Supply voltage range Ambient temperature Parameters Symbol RthJA Symbol VS = 5 V, Tamb = 25C 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 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AA A AAAAAAAAAAAAAAAAAAAAAAAA A A AA A A A AA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AAAA A A A A A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA 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 vin 2 3 IF AGC: Gv = 46 dB 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) Rev. A2, 23-Apr-99 Preliminary Information 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 each amplitude of 1.8 Vpp (or lower). Please note that 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. Rev. A2, 23-Apr-99 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) Rev. A2, 23-Apr-99 Preliminary Information U4476B Ozone Depleting Substances Policy Statement It is the policy of TEMIC Semiconductor 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 Semiconductor GmbH 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 Semiconductor GmbH 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 Semiconductors products for any unintended or unauthorized application, the buyer shall indemnify TEMIC Semiconductors 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 Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 ( 0 ) 7131 67 2594, Fax number: 49 ( 0 ) 7131 67 2423 Rev. A2, 23-Apr-99 7 (7) Preliminary Information |
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