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| U2795B 2.5-GHz Double-Balanced Mixer Description The U2795B is a 2.5-GHz mixer for WLAN and RF telecommunications equipment, e.g., DECT and PCN. The IC is manufactured using Atmel Wireless & Microcontrollers' advanced bipolar technology. A double-balanced approach was chosen to assure good isolation characteristics and a minimum of spurious products. The input and output are single ended, and their characteristics are programmable. No output transformer or balun is required. Electrostatic sensitive device. Observe precautions for handling. Features D Supply-voltage range: 2.7 to 5.5 V D Single-ended output, no balun required D Single-ended input for RF and LO D Excellent isolation characteristics D Power-down mode D IP3 and compression point programmable D 2.5-GHz operating frequency Benefits D Reduced system costs as only few external component (no balun) are required D Stand-alone product D 3-V operation reduces battery count and saves space Block Diagram VS 2 RFi 3 P R1 VH VH VR Voltage regulator 8 PD R2 5 IFo 4 So 7 LO i GND 6 VS 1 93 7811 e Figure 1. Block diagram Ordering Information Extended Type Number U2795B-MFP U2795B-MFPG3 Package SO8 SO8 Tube Taped and reeled Remarks Rev. A4, 10-Oct-00 1 (10) U2795B Pin Description VS RFI P SO 1 2 3 4 8 7 6 5 PD LOi GND IFO 94 7890 e Pin 1 2 3 4 5 6 7 8 Symbol VS RFi P SO IFO GND LOi PD RF input Function Supply voltage Progamming port IP3, CP Output symmetry IF output Ground LO input Power down Figure 2. Pinning Functional Description Supply Voltage The IC is designed for a supply-voltage range of 2.7 V to 5.5 V. As the IC is internally stabilized, the performance of the circuit is nearly independent of the supply voltage. Output Impedance and Intercept Point The output impedance is shown in figure 11. Both low output impedance and a high intercept point are defined to a high value of RP. Input Impedance The input impedance, ZRFi, is about 700 W with an additional capacitive component. This condition provides the best noise figure in combination with a matching network. Current Consumption, IS Depending on the chosen input and output conditions of the IC, the current consumption, IS, is between 4 mA and 10 mA. The current consumption in dependence of Rp is shown in figure 6. Power Down This feature provides extended battery lifetime. If this function is not used, Pin 8 has to be connected to VS (Pin 1). 3rd Order Intercept Point (IP3) The voltage divider, RP / R1, determinates both the input and output intercept point, IIP3 and OIP3. If the value of RP is infinite, the maximum value of IIP3 reachs about -4 dBm. The IP3/RP characteristics are shown in figure 3, and 4. Output Symmetry The symmetry of the load current can be matched and thus optimized for a given load impedance. Absolute Maximum Ratings Parameters Supply voltage Input voltage Junction temperature Storage-temperature range Pin 1 Pins 2, 3, 7 and 8 Symbol VS VI Tj Tstg Symbol Rthja Value 6 0 to VS 125 -40 to +125 Unit V V C C Unit K/W Thermal Resistance Parameters Junction ambient SO 8 Value 175 Operating Range Parameters Supply-voltage range Ambient-temperature range Pin 1 Symbol VS Tamb Value 2.7 to 5.5 -40 to +85 Unit V C 2 (10) Rev. A4, 10-Oct-00 U2795B Electrical Characteristics VS = 3 V, fLOi = 1 GHz, IF = 900 MHz, RF = 100 MHz, RP =R, system impedance Zo = 50 W, Tamb = 25C, RT = 56 W reference point Pin 6, unless otherwise specified Parameters Supply voltage range Maximum supply current Conversion power gain Operating frequencies RFi frequency LOi frequency IFo frequency Isolation LO spurious at RFi RFi to LOi LO spurious at IFo IFo to LOi Output (IF) Output compression point Input (RF) Input impedance Input compression point 3rd-order input intercept point Input (LO) LO level Input LO Output IF Noise performance Noise figure Power-down mode Supply current Power-down voltage "Power ON" "Power DOWN" Power-down current Settling time Pin 8 VS = 3.5 to 5.5 V VS = 2.7 to 3.5 V Pin 8 Pin 8 Power ON Power DOWN Pin 8 to 5 VPON VPDN IPON IPDN tsPD VS-0.5 VS 0.15 <5 <30 VS +0.5 VS +0.5 1 V V V mA mA ms Pin 1 VPD < 0.5 V Pin 1 VPD = 0 V ISPD <5 30 mA PiLO = 0 dBm, RT = R NF 10 dB Pin 2 Pin 2 Pin 2 ZRFi CPi IIP3 700k0.8 -14 -4 WkpF dBm dBm Pin 5 CPo -10 dBm Pin 7 to 2, PiLO = -10 to 0 dBm Test Conditions / Pin Pin 1 Pin 1 RL = 50 W, RT = R RL = 50 W, RT = 56 W Pin 2 Pin 7 Pin 5 Symbol VS IS IS PGC PGC RFi fLOi fIFo ISLO-RF ISRF-LO ISLO-IF ISIF-LO Min. 2.7 4 Typ. Max. 5.5 11 13 Unit V mA mA dB dB Typical supply-current range Pin 1, depending on RP 9 4 10 50 50 -30 35 -25 30 2500 2500 2500 MHz MHz MHz dBm dB dBm dB Pin 2 to 7, PiRF = -25 dBm Pin 7 to 5, PiLO = -10 to 0 dBm Pin 5 to 7 Pin 7 Pin 7 Pin 4 PiLO VSWRLOi VSWRIFo -6 <2 <2 dBm Voltage standing wave ratio (VSWR) Rev. A4, 10-Oct-00 3 (10) U2795B -4 3 -5 IIP3 ( dBm ) -6 -7 -8 -9 -9 -10 0 94 9235 Gain ( dB ) 100 94 9237 -1 -5 -13 20 40 60 80 0 20 40 60 80 100 Rp ( kW ) Rp ( kW ) Figure 3. IIP3 versus resistor Rp, IF: 900 MHz Figure 5. Gain versus resistor Rp, LO: 1030 MHz, level -10 dBm; RF: 130 MHz, -30 dBm, RT = 56 W 0 12 10 8 I s ( mA ) -5 OIP3 ( dBm ) -10 6 4 -15 -20 -25 0 20 40 60 80 100 2 0 0 94 9238 20 40 60 80 100 94 9236 Rp ( kW ) Rp ( kW ) Figure 4. OIP3 versus resistor Rp, IF: 900 MHz Figure 6. Supply current IS versus resistor Rp 4 (10) Rev. A4, 10-Oct-00 U2795B 18 with RF input matching: Ls=220nH, Cp=4.7pF 12 10 8 NF ( dB ) 1000 1500 2000 2500 94 9241 14 Gain ( dB ) without RT 10 6 4 2 6 2 with RT=56W -2 0 500 0 0 200 400 600 800 IF ( MHz ) IF ( MHz ) 94 9239 Figure 7. Gain versus IF output frequency, LO level: -6 dBm, RF: 130 MHz, -35 dBm; parameter: RF input termination 0 -2 -4 IIP3 ( dBm ) -6 -8 -10 -12 -14 -16 -18 0 94 9240 Figure 9. Double sideband noise figure versus IF output frequency; LO: 1000 MHz, level 0 dBm; no RF input matching, RT left out 5 with RT = 56 W 4 VSWR without RT 3 2 with RF input matching: Ls = 220 nH, Cp = 4.7 pF 500 1000 1500 2000 2500 95 9652 1 100 280 460 640 820 1000 IF ( MHz ) IF Frequency ( MHz ) Figure 8. IIP3 versus IF output frequency, LO level: -6 dBm; RF: 130 MHz / 130.1 MHz, -35 dBm; parameter: RF input termination Figure 10. Typical VSWR frequency response of the IF output, RP = R Rev. A4, 10-Oct-00 5 (10) U2795B j 0.5j 2j 0.2j 5j 0 -0.2j 94 9473 Figure 11. Typical impedance of the output versus RP at frequency fIFo = 900 MHz markers (from left to right): RP = R / 22 kW / 10 kW / 8.2 kW / 5.6 kW j 0.5j 0.2j 0 0.2 -0.2j -0.5j 95 9651 Figure 12. Typical S11 frequency response of the IF output, RP = R, IF frequency from 100 MHz to 1000 MHz, marker: 900 MHz 6 (10) AA AA AAAA AA AA AA AAAA AA 0.2 0.5 1 2 5 -5j -0.5j -j -2j 2j 1 5j AA AA AA AA AA AA AA AA AA AA 0.5 1 2 5 -5j -2j -j 1 Rev. A4, 10-Oct-00 U2795B j 0.5j 2j 0.2j 5j 0 -0.2j 95 9653 Figure 13. Typical S11 frequency response of the RF intput, RP = R, RT = R RF frequency from 100 MHz to 1000 MHz, marker: 900 MHz 0.2j -0.2j 95 9654 Figure 14. Typical S11 frequency response of the LO intput, RP = R, LO frequency from 100 MHz to 1000 MHz, marker: 900 MHz Rev. A4, 10-Oct-00 A AA AAAA AA 0 AA AA AAAA AA AA AA AAAA AA 0.2 0.5 1 2 5 -5j -0.5j -j -2j j 0.5j 2j 5j 0.2 0.5 1 2 5 -5j -0.5j -j -2j 1 1 7 (10) U2795B Application C1 VS RT RF C2 RP 3 C6 C3 RSO 94 8511 C7 1 U2795B 2 8 C5 7 6 C4 4 5 IF LO PD RI Figure 15. Part List C1 C2, C3, C4, C5, C6, C7 *RP 50-W Microstrip *RSO RT 68 W optional 56 W 10 nF 100 pF If the part-list values are used, the PD settling time is t20 ms. Using other values, time requirements in burst-mode applications have to be considered. The values of RSO and RP depend on the input and output condition requirements. For RSO, 68 W is recommended. By means of the optional RI, the intercept and compression point can be slightly increased; values between 500 W and 1 kW are suitable. Please note that such modification will also increase the supply current. Application Circuit (Evaluation Board) 95 9697 94 8512 Figure 16. Figure 17. 8 (10) Rev. A4, 10-Oct-00 U2795B Package Information Package SO8 Dimensions in mm 5.00 4.85 1.4 0.4 1.27 3.81 8 5 0.25 0.10 0.2 3.8 6.15 5.85 5.2 4.8 3.7 technical drawings according to DIN specifications 13034 1 4 Rev. A4, 10-Oct-00 9 (10) U2795B Ozone Depleting Substances Policy Statement It is the policy of Atmel Germany 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. Atmel Germany 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. Atmel Germany GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances. 1. 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 Atmel Wireless & Microcontrollers products for any unintended or unauthorized application, the buyer shall indemnify Atmel Wireless & Microcontrollers 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. Data sheets can also be retrieved from the Internet: http://www.atmel-wm.com Atmel Germany GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423 10 (10) Rev. A4, 10-Oct-00 |
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