VHF/UHF TV, VCR TUNER ICs

Transcription

1 Application Note µpc2743gs and µpc2744gs VHF/UHF TV, VCR TUNER ICs Silicon Microwave Monolithic IC Document No. P11066EJ2V0AN00 (2nd edition) Date Published November 1999 N CP(K) Printed in Japan 1996, 1999

2 The information in this document is subject to change without notice. Before using this document, please confirm that this is the latest version. No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Corporation or others. Descriptions of circuits, software, and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software, and information in the design of the customer's equipment shall be done under the full responsibility of the customer. NEC Corporation assumes no responsibility for any losses incurred by the customer or third parties arising from the use of these circuits, software, and information. While NEC Corporation has been making continuous effort to enhance the reliability of its semiconductor devices, the possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or property arising from a defect in an NEC semiconductor device, customers must incorporate sufficient safety measures in its design, such as redundancy, fire-containment, and anti-failure features. NEC devices are classified into the following three quality grades: "Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a customer designated quality assurance program for a specific application. The recommended applications of a device depend on its quality grade, as indicated below. Customers must check the quality grade of each device before using it in a particular application. Standard: Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) Specific: Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact an NEC sales representative in advance. The mark shows major revised points. M Application Note P11066EJ2V0AN00

3 CONTENTS 1. OUTLINE PIN CONFIGURATION AND INTERNAL BLOCK DIAGRAM PRODUCT FEATURES ELECTRICAL SPECIFICATIONS APPLICATION CIRCUIT EXAMPLE Design of Oscillator Design of VHF oscillator Design of UHF oscillator IF Tuning Circuit CHARACTERISTICS OF µpc2743gs AND µpc2744gs Conversion Gain and Noise Figure Input/Output Characteristic and Distortion Characteristic NOTES ON USE PACKAGE DIMENSIONS Application Note P11066EJ2V0AN00 3

4 1. OUTLINE The µpc2743gs and µpc2744gs are VHF/UHF mixer/oscillator ICs developed for TV/VCR tuners; the first features excellent distortion characteristics, and the latter, high conversion gain and low noise characteristics. Both have an internal circuit configuration consisting of a double-balance type mixer, oscillator, IF amp and prescaler buffer amp, packaged in 20-pin SOP suitable for high density mounting. The following are the points to be noted when using these ICs. 2. PIN CONFIGURATION AND INTERNAL BLOCK DIAGRAM Figures 1 and 2 show a pin configuration diagram and internal block diagram. If we follow the flow of blocks and signals on the VHF mode, we can see that the RF signal is first input to pins 16 and 17 to be supplied to the mixer. The output of pins 8 to 10 from the oscillator (OSC) is amplified by a buffer amp, and input to the mixer. By multiplying it with the RF signal, the sum and difference components of the RF and OSC frequencies are output from the mixer as an IF signal. In order to select only the difference component, after inserting an IF tuning circuit into pins 14 and 15, the IF signal amplified by the IF amp is output from pin 12. Meanwhile, the OSC output signal is amplified by a buffer amp separate from that for the mixer and then output from pin 6 as an input signal to the prescaler. If we follow the flow of blocks and signals on the UHF mode, we can see that the RF signal is input to pins 19 and 20, and multiplied with the OSC output signal from pins 1 to 4 by the mixer. The subsequent signal flow is the same as that on the VHF mode. What is different from the blocks on the VHF side is that the UHF oscillator is provided with 4-pin balance amp type oscillator designed for oscillation frequency stabilization, because the UHF oscillator has higher frequencies, which can be a problem if there are variations in temperature and supply voltage. Figure 1. Pin Configuration (Top View) UOSC collector (Tr.1) UOSC base (Tr.2) UOSC base (Tr.1) UOSC collector (Tr.2) UB OSC output GND VOSC base (bypass) VOSC base (feedback) VOSC collector VB output IF output Vcc MIX output 1 MIX output 2 VRF input 1 VRF input 2 GND URF input 1 URF input 2 4 Application Note P11066EJ2V0AN00

5 Figure 2. Internal Block Diagram REG. U OSC V OSC PRODUCT FEATURES The main features are as follows. (1) UHF/VHF mixer, oscillator and IF amp integrated on a single chip (2) Two model line-up: low distortion type (µpc2743gs) and high conversion gain, low noise type (µpc2744gs) (3) Use of a balance amp type local oscillator (UHF block) reduces supply voltage variations and temperature drift of oscillation frequency (4) Use of a push-pull type IF amp offers high saturation output level. Furthermore, having low output impedance, it is easily connected to the IF SAW filter. (5) Use of a 20-pin SOP package allows compact, high density mounting. 4. ELECTRICAL SPECIFICATIONS Tables 1, 2, 3 and 4 show the absolute maximum ratings, recommended operating range, electrical specifications and standard characteristics (reference values) of the µpc2743/2744gs, respectively. Application Note P11066EJ2V0AN00 5

6 Table 1. Absolute Maximum Ratings (TA = 25 C) Item Symbol Condition Rating Unit Supply voltage 1 VCC V Supply voltage 2 VCC V Power dissipation PD TA = 75 C Note 750 mw Operating temperature range Topt 20 to +75 C Storage temperature range Tstg 55 to +150 C Note When mounted on mm entirely copper plated double-sided glass epoxy board Table 2. Recommended Operating Range Item Symbol MIN. TYP. MAX. Unit Supply voltage 1 VCC V Supply voltage 2 VCC V Table 3. Electrical Specifications (TA = 25 C, VCC = 9 V) Item Symbol Condition µpc2743 µpc2744 MIN. TYP. MAX. MIN. TYP. MAX. Unit Circuit current 1 (VHF) ICC1 No input signal Note ma Circuit current 2 (UHF) ICC2 No input signal Note ma Conversion gain 1 (VHF (L)) CG1 frf = 55 MHz, PRF = 30 dbm Note db Conversion gain 2 (VHF (M)) CG2 frf = 200 MHz, PRF = 30 dbm Note db Conversion gain 3 (VHF (H)) CG3 frf = 470 MHz, PRF = 30 dbm Note db Conversion gain 4 (UHF (L)) CG4 frf = 470 MHz, PRF = 30 dbm Note db Conversion gain 5 (UHF (H)) CG5 frf = 890 MHz, PRF = 30 dbm Note db Noise figure 1 (VHF (L)) NF1 frf = 55 MHz Note db Noise figure 2 (VHF (M)) NF2 frf = 200 MHz Note db Noise figure 3 (VHF (H)) NF3 frf = 470 MHz Note db Noise figure 4 (UHF (L)) NF4 frf = 470 MHz Note db Noise figure 5 (UHF (H)) NF5 frf = 890 MHz Note db Maximum output power 1 (VHF (L)) PO(SAT)1 frf = 55 MHz, PRF = 0 dbm Note dbm Maximum output power 2 (VHF (M)) PO(SAT)2 frf = 200 MHz, PRF = 0 dbm Note dbm Maximum output power 3 (VHF (H)) PO(SAT)3 frf = 470 MHz, PRF = 0 dbm Note dbm Maximum output power 4 (UHF (L)) PO(SAT)4 frf = 470 MHz, PRF = 0 dbm Note dbm Maximum output power 5 (UHF (H)) PO(SAT)5 frf = 890 MHz, PRF = 0 dbm Note dbm OSC oscillation output level PPSC Note dbm Caution Unless specified otherwise, VHF: pin 10 = 9 V, pins 8 and 9 shorted UHF: pins 3, 4 and 10 = 9 V, pins 8 and 9 shorted, IF = 45 MHz, OSC Level = 0 dbm Notes 1. Measured on measurement circuit (Figure 3) 2. Measured on application circuit example (Figure 5) 6 Application Note P11066EJ2V0AN00

7 Table 4. Standard Characteristics (Reference Values) (TA = 25 C, VCC = 9 V) Item Symbol Condition µpc2743 Reference Value µpc2744 Unit Conversion gain 1 (VHF (L)) CG1 frf = 55 MHz, fif = 45 MHz, PRF = 30 dbm db Conversion gain 2 (VHF (H)) CG2 frf = 360 MHz, fif = 45 MHz, PRF = 30 dbm db Conversion gain 3 (UHF (L)) CG3 frf = 400 MHz, fif = 45 MHz, PRF = 30 dbm db Conversion gain 4 (UHF (H)) CG4 frf = 800 MHz, fif = 45 MHz, PRF = 30 dbm db Noise figure 1 (VHF (L)) NF1 frf = 55 MHz, fif = 45 MHz db Noise figure 2 (VHF (H)) NF2 frf = 360 MHz, fif = 45 MHz db Noise figure 3 (UHF (L)) NF3 frf = 400 MHz, fif = 45 MHz db Noise figure4 (UHF (H)) NF4 frf = 800 MHz, fif = 45 MHz db 1 % cross modulation distortion 1 CM1 fdes = 55 MHz Note dbµ (VHF (L)) 1 % cross modulation distortion 2 CM2 fdes = 360 MHz Note dbµ (VHF (H)) 1 % cross modulation distortion 3 CM3 fdes = 400 MHz Note dbµ (UHF (L)) 1 % cross modulation distortion 4 CM4 fdes = 800 MHz Note dbµ (UHF (H)) 6-channel beat S/I Note dbc Oscillation output power 1 (VHF (L)) POSC1 fosc = 100 MHz 4 4 dbm Oscillation output power 2 (VHF (H)) POSC2 fosc = 405 MHz 5 5 dbm Oscillation output power 3 (UHF (L)) POSC3 fosc = 445 MHz 9 9 dbm Oscillation output power 4 (UHF (H)) POSC4 fosc = 845 MHz dbm Caution As per application circuit example (Figure 5) Notes 1. fundes = fdes + 12 MHz, Pin = 30 dbm, AM 100 khz 30 % modulation, DES/CM = 46 dbc, output open conversion value 2. fp = MHz, fs = MHz, Pin = 30 dbm each, fosc = 129 MHz Application Note P11066EJ2V0AN00 7

8 5. APPLICATION CIRCUIT EXAMPLE Figures 3 and 4 show the measurement circuit and an application circuit example, respectively. This application circuit example is intended for a so-called 181-channel type tuner capable of receiving all channels using US band including CATV band. Figure 3. Measurement Circuit 1 20 UHF RF IN UHF OSC IN VHF RF IN UB NC 7 14 NC 8 13 VCC VHF OSC IN 9 12 IF OUT Operating Mode VCC UB VHF UHF 9 V Open 9 V 9 V Figure 4. VHF Basic Oscillator Circuit VCC C1 C2 C3 R1 VTU L1 D1 8 Application Note P11066EJ2V0AN00

9 The concrete band division method and frequencies are shown in Table 5. Table 5. Band Division Method and Receive Frequency/OSC Frequency Band Ch. No Central Receive Frequency (MHz) OSC Frequency (MHz) VLOW 2 to B 57 to to 173 VHIGH C to W to to 407 UHF W + 11 to to to Design of Oscillator Design of VHF oscillator The VHF oscillator consists of differential amps shown in Figure 4 and the pins are configured as follows. Pin 8; bypass pin, pin 9; feedback pin (base side) and pin 10; feedback pin (collector side). Therefore, the basic circuit of VCO can be made up by grounding (C1) pin 8 in a form appropriate to high frequencies, and inserting a positive feedback capacitor (C2) between pins 9 and 10 and an LC resonance circuit to pin 10 (collector side). However, since in the actual application circuit, it is necessary to oscillate in a very wide range such as 101 to 407 MHz, the following two points should be incorporated into the design based on the basic circuit in Figure 4. (1) Since one band is not sufficient to cover the prescribed frequencies, divide the inductor into two parts and use a switching diode to switch between VHIGH and VLOW. (VLOW; 101 to 173 MHz, VHIGH; 179 to 407 MHz) (2) The oscillation frequency range is still wide even after band division, and therefore use a varicap diode instead of the fixed capacitor as the feedback capacitor (C2 in Figure 4). Select an oscillation circuit varicap diode (D1) with a large enough capacitance variation ratio. Here, the 1T363 manufactured by Sony will be used for both. Figure 5 shows an application circuit example in which points (1) and (2) above have been incorporated into the design, and Figure 6 shows its printed wiring board and layout. Figure 7 shows the oscillation output characteristic when the application circuit example in Figure 5 is used (pin 6 is monitored by a spectrum analyzer) and Figure 8 shows tuning voltage vs. oscillation frequency characteristic. As shown in this data, the above circuit allows a sufficient oscillation frequency range of approximately 100 to 200 MHz at a tuning voltage of approximately 1.5 V to 25 V with VLOW and its pin 6 also provides a 17 dbm, flat output. Figure 9 shows the temperature drift characteristic of the oscillation frequency. The result shows that the temperature drift is limited to approximately ±1.2 MHz to ±1.6 MHz with VLOW and approximately ±2 MHz to +2.5 MHz/ to +75 C with VHIGH. As shown in Figure 9, variations in oscillation frequency are virtually symmetric in the vertical direction and this is data from an application circuit which does not use a temperature compensation capacitor, and therefore it is assumed that use of a temperature compensation capacitor may further reduce the level of temperature drift. Application Note P11066EJ2V0AN00 9

10 Figure 5. Application Circuit Example pf VTU UB (9 V) OSC OUT 3T 5T 2.7 kω 47 kω IT363 3T 47 kω 300 pf 12 pf 300 pf 47 kω 3T 47 kω 10 pf IT pf 3 pf IT363 1 pf pf 1 pf V OSC U OSC REG pf 1.2 µ H URF IN VRF IN VCC (9 V) IF OUT 0.1 µ F pf 0.1 µ F 47 kω LB (9 V) HB (9 V) VTU The application circuits and their parameters are for references only and are not intended for use in actual design-in's. 10 Application Note P11066EJ2V0AN00

11 Figure 6. Printed Wiring Board and Layout VtU (Back side) URF IN U OSC Application Note P11066EJ2V0AN00 VRF IN PSC OUT IF OUT VOSC IN.OUT 11 VCC UB VtU HB LB represents cutout. represents short-circuited strip.

12 Figure 7. VHF Oscillation Output Characteristic (6-Pin Output) REF 0.0 dbm 10 db/ ATTEN 10 db CENTER 500 MHz SPAN 1.00 GHz RES BW 1 MHz VBW 300 Hz SWP 300 msec Figure 8. Tuning Voltage - Oscillation Frequency Characteristic Common to µ PC2743/44GS 30 OSC TUNING VOLTAGE vs. OSC FREQUENCY Tuning voltage Vtu (V) VL VH U Application circuit example Oscillation frequency fosc (MHz) Figure 9. Oscillation Frequency Temperature Drift Characteristic fosc - temperature drift Temperature drift (MHz) C C 0 C 3 25 C Oscillation frequency fosc (MHz) 12 Application Note P11066EJ2V0AN00

13 Although the application circuit example in Figure 5 also has an optimized phase noise (C/N) characteristic of oscillation output, it may change depending on GND and the VCC print pattern, etc. Since one of the major reasons for C/N deterioration is the fact that low frequency noise from the HB or LB band switching bias line modulates the oscillator collector, inserting the largest possible electrolytic capacitors in HB and LB to bypass low frequency noise is effective. In some cases, inserting serial resistors in HB and LB, thus forming an C-R type low pass filter may be more effective. Other cautions are related to oscillation stop and abnormal oscillation. These phenomena are more likely to occur with the low-end part of each band where Q of the varicap diode decreases. The best method to avoid this is to minimize the length of the print pattern around the resonance circuit and switching diode avoiding extra inductance or to prevent the pattern from being larger than necessary and having stray capacitance. In short, it is important to minimize the load on the oscillator Design of UHF oscillator The UHF oscillator features a stabilization mechanism against variations in the oscillation frequency and supply voltage by configuring a symmetric balance type oscillator by drawing out all the pins of the differential amp, 4 in total, as shown in Figure 10. The balance type oscillator can be configured basically by inserting positive feedback capacitors C1 and C2 between pins 1 and 2, and between pins 3 and 4 and inserting resonance circuits D1 and L1 between pins 1 and 4 which are the collectors, as shown in Figure 10. (C3 and C4 are DC cut capacitors, and R1 and R2 are tuning Di bias resistors.) Figure 10. UHF Basic Oscillator VCC C1 D1 L1 C2 C3 R1 R2 C4 VTU Application Note P11066EJ2V0AN00 13

14 Figure 11. Basic Circuit Oscillation Output Characteristic REF 0.0 dbm 10 db/ ATTEN 10 db CENTER 600 MHz SPAN 1.00 GHz RES BW 1 MHz VBW 300 Hz SWP 300 msec However, it is obvious as shown in Figure 11, that the basic oscillator (Figure 10) doesn t have sufficient oscillation frequency bandwidth. (C1, C2 = 1 pf, C3, C4 = 300 pf, R1, R2 = 47 kω, L1 = 3T) Therefore, in order to cover the prescribed oscillation frequency bandwidth of 413 to 847 MHz, capacitors are inserted between pins 2 and 3, and both sides of D1 and L1, forming a serial-parallel type resonance circuit with D1 and L1. The final application circuit is as shown in Figure 5 and the two added capacitors each have 12 pf. The characteristic of this is shown in Figure 12. The oscillation frequency range obtained is approximately 360 to 860 MHz, approximately 2.4 times of change ratio. The oscillation frequency coverage can be changed by arbitrarily selecting the value of capacitors. For example, reducing the value of both capacitors by half (6 pf) narrows the range to approximately 440 to 900 MHz (approximately 1.8 times) as shown in Figure 13. However, care is required because too big a value may cause abnormal oscillation. Figure 9 shows the temperature drift characteristic of the oscillation frequency. The result shows variations of approximately ±2 MHz on the low-end side and ±4 25 to +75 C on the high-end side of UHF. Since its figure is symmetric in the vertical direction and no temperature compensation capacitor is used, it is possible to use a temperature compensation capacitor to further reduce the amount of variation. Figure 12. Oscillation Output Characteristic with Additional 12 pf REF 0.0 dbm 10 db/ ATTEN 10 dbm CENTER 500 MHZ SPAN 1.00 GHz RES BW 1 MHz VBW 300 Hz SWP 300 msec 14 Application Note P11066EJ2V0AN00

15 Figure 13. Oscillation Output Characteristic with Additional 6 pf REF 0.0 dbm 10 db/ ATTEN 10 dbm CENTER 500 MHz SPAN 1.00 GHz RES BW 1 MHz VBW 300 Hz SWP 300 msec 5.2 IF Tuning Circuit It is necessary to insert a band pass filter to select only the IF signal. Two locations are possible for insertion of the IF filter. One is pins 14 and 15 of the mixer output, and the other is pin 12 of the IF output pin. Because the selection characteristic for IF signal is determined by Q of the band pass filter, it is best to insert the filter in a place with high impedance. In the case of the µpc2743gs and µpc2744gs, pins 14 and 15 are output with high impedance at the mixer output (collector output) and pin 12 output is low output impedance at the push-pull amp output, and therefore it is best to insert the band pass filter between pins 14 and 15. Since this application is intended for the US band, the central frequency of the IF band pass filter should be tuned to approximately 45 MHz. Actually, as shown in Figure 5, a 1.2 µh coil with a ferrite core and 6 pf parallel resonance circuit are inserted between pins 14 and 15 to make fine adjustment possible. Use the fine adjustment of this band filter to obtain the maximum conversion gain at the prescribed IF frequency. Application Note P11066EJ2V0AN00 15

16 6. CHARACTERISTICS OF µpc2743gs AND µpc2744gs 6.1 Conversion Gain and Noise Figure Figures 14 and 15 show the conversion gain and noise figure frequency characteristic of the µpc2743gs and µpc2744gs, respectively. Figure 14. Conversion Gain and Noise Figure 15. Conversion Gain and Noise Figure of µpc2743gs Figure of µpc2744gs µ PC2743GS CONVERSION GAIN AND NOISE FIGURE vs. RF FREQUENCY 40 On application circuit VCC = 9 V 35 fif = 45 MHZ PRF = 30 dbm 30 Conversion gain CG, noise figure NF (db) CG NF RF frequency frf (MHz) µ PC2744GS CONVERSION GAIN AND NOISE FIGURE vs. RF FREQUENCY 40 On application circuit VCC = 9 V 35 fif = 45 MHZ PRF = 30 dbm 30 Conversion gain CG, noise figure NF (db) CG 10 NF RF frequency frf (MHz) In order to give importance to the distortion characteristic, the µpc2743gs suppresses conversion gain of the mixer more than the µpc2744gs does. It is also designed so that conversion gain of the UHF block is set high to cancel out the gain difference between VHF and UHF RF amp blocks, resulting in the VHF tuner and UHF tuner having almost the same gain. The µpc2744gs features high conversion gain and low noise figure, having approximately 28 db conversion gain and 9 to 10 db of noise figure at the VHF block and approximately 36 db conversion gain and 8 to 10 db of noise figure at the UHF block, while maintaining a good frequency characteristic. 16 Application Note P11066EJ2V0AN00

17 6.2 Input/Output Characteristic and Distortion Characteristic Figures 16 and 17 show the input/output characteristic and 6-channel beat characteristic of the µpc2743gs and µpc2744gs, respectively. Since both products maintain a high output level of +13 dbm as the maximum output power at the time of saturation, they can achieve a wide dynamic range and low distortion characteristic as tuners. Figure 16. Pin-Pout and 6-Channel Beat Figure 17. Pin-Pout and 6-Channel Beat Characteristics of µpc2743gs Characteristics of µpc2744gs µ PC2743GS 6-CHANNEL BEAT AND OUTPUT POWER vs. µ PC2744GS INPUT POWER 6-CHANNEL BEAT AND OUTPUT POWER vs. INPUT POWER fp = MHZ fp = MHZ 6-channel beat (dbc) Output level Pout (dbm) fs = MHZ Pin = 30 dbm each fosc = 129 MHZ Pin - Pout 6-channel beat 6-channel beat (dbc) Output level Pout (dbm) fs = MHZ Pin = 30 dbm each fosc = 129 MHZ Pin - Pout 6-channel beat Input level Pin (dbm) Input level Pin (dbm) Regarding the distortion characteristic, it is possible to judge it mainly based on two kinds of distortion characteristic. One is 6-channel beat, distortion characteristic specific to the US band, and the other, cross modulation. First, the 6-channel beat is interference within the IF band due to generation of a component corresponding to the difference between the double wave of the 6-channel reception voice carrier (87.75 MHz) and oscillation output (129 MHz) of the US band, and this applies to a tuner with 55 db or above with antenna input of 60 dbµ ( 47 dbm). The desirable level of the 6-channel beat of the µpc2743gs and µpc2744gs depends on the gain of the first-stage RF amp, and cannot be generalized. However, if the gain of the RF amp is assumed to be approximately 20 db, 55 db may be considered satisfactory for the 6-channel beat characteristic for an input of approximately 27 dbm to 30 dbm. The actual results are as follows. µpc2743gs: 56 to 57.5 = 27 to 30 dbm µpc2744gs: 52 to 53.5 = 27 to 30 dbm In the case of the µpc2744gs, its design is originally focused on high conversion gain and low noise and thus it has a distortion characteristic slightly inferior to that of the µpc2743gs, but it shows a value very close to the target characteristic. If you want to improve the 6-channel beat a little more using the µpc2744gs, inserting a damping resistor (400 to 500 Ω) between pins 16 and 17 allows the 6-channel beat to be improved without degrading gain and noise figure of the tuner as a whole. This is because, as shown in Figure 18, its sufficiently high input impedance allows damping with high resistance and improvement of the 6-channel beat causing almost no influence on the selection characteristic, gain and noise figure. However, care is required because too strong damping may deteriorate various characteristics. For reference, the UHF input S parameter is shown in Figure 19 and IF output S parameter in Figure 20. For 1 % cross modulation distortion, as shown in Table 4, 100 khz, 30 % AM modulation is applied to the second adjacent channel and the open value of the second adjacent channel level at which 1 % distortion is generated on the desired signal is displayed. The µpc2743gs and µpc2744gs both obtain satisfactory levels, showing 90 to 97 dbµ and 80 to 92 dbµ, respectively in all bands. Application Note P11066EJ2V0AN00 17

18 Figure 18. VHF Input S Parameter of µpc2743gs and µpc2744gs MARKER MHz MARKER 1; 55 MHz 2; 200 MHz 3; 470 MHz START MHz STOP MHz Figure 19. UHF Input S Parameter of µpc2743gs and µpc2744gs MARKER MHz MARKER 1; 470 MHz 2; 600 MHz 3; 890 MHz START MHz STOP MHz 18 Application Note P11066EJ2V0AN00

19 Figure 20. IF Output S Parameter of µpc2743gs and µpc2744gs MARKER 1 45 MHz 1 S22 C2 START MHz STOP MHz Application Note P11066EJ2V0AN00 19

20 7. NOTES ON USE (1) Care is required for excessive input of static electricity, etc. because this IC uses high frequency bipolar process. (2) Use the widest possible earth pattern to prevent ground impedance from increasing. (3) Insert a bypass capacitor into the VCC pin. Inserting two capacitors, for example, a ceramic capacitor and 0.1 µf electrolytic capacitor to eliminate high frequency and low frequency noise, etc. is effective. 20 Application Note P11066EJ2V0AN00

21 8. PACKAGE DIMENSIONS 20 PIN PLASTIC SOP (300 mil) (UNIT: mm) detail of lead end ± ± ± ± MAX. 0.6± ± M ± MAX. NOTE Each lead centerline is located within 0.12 mm of its true position (T.P.) at maximum material condition. Application Note P11066EJ2V0AN00 21

22 [MEMO] 22 Application Note P11066EJ2V0AN00

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