U2795B-FP

TELEFUNKEN Semiconductors U2795B 2.5-GHz Double Balanced Mixer Description U2795B is a 2.5-GHz mixer for WLAN and RF telecommunications equipment, e.g., DECT and PCN, built with TELEFUNKEN’s 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. 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 Exellent isolation characteristics D Power down mode D IP3 and compression point programmable D 2.5-GHz operating frequency D SO-8 package Benefits D Reduced system costs due to few external component (no balun) requirements D Standard independent product D 3-V operation reduces the battery count and saves space Block Diagram VS 2 RFi 3 P R1 VH VH VR Voltage regulator PD 8 R2 IFo 5 So 4 LO i 7 GND 6 VS 1 93 7811 e Rev. A2: 08.06.1995 1 (13) U2795B Pin Description Pin 1 2 3 4 5 6 7 8 TELEFUNKEN Semiconductors VS RFI P SO 1 2 3 4 94 7890 e 8 7 6 5 PD LOi GND IFO Symbol VS RFi P SO IFO GND LOi PD Function Supply voltage RF input Progamming port IP3, CP Output symmetry IF output Ground LO input Power down Functional Description Supply Voltage The IC is designed for a supply voltage of 2.7 to 5.5 V. As the IC is internally stabilized, the performance of the circuit is nearly independent of the supply voltage. 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 4. Input Impedance 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. Power Down This feature provides an extension of battery life. If this function is not used, Pin 8 has to be connected to VS (Pin 1). 3. Order Intercept Point (IP3) Voltage divider, RP / R1, determinates both the input and output intercept point, IIP3 and OIP3. If RP is infinity the IIP3 has the maximum of about – 4 dBm. The IP3/RP characteristics are shown in figure 1 and 2. Output Symmetry The symmetry of the load current can be matched and so be optimized for a given load impedance. Output Impedance and Intercept Point Output impedance is shown in figure 9. Both low output impedance and a high intercept point are with reference to a high value of RP. 2 (13) Rev. A2: 08.06.1995 TELEFUNKEN Semiconductors U2795B Symbol VS VI Tj Tstg Value 6 0 to VS 125 – 40 to + 125 Unit V V °C °C Absolute Maximum Ratings Parameters Supply voltage Input voltage Junction temperature Storage temperature range Pin 1 Pins 2, 3, 7 and 8 Thermal Resistance Parameters Junction ambient SO 8 Symbol Rthja Value 175 Unit K/W Operating Range Parameters Supply voltage range Pin 1 Ambient temperature range Symbol VS Tamb Value 2.7 to 5.5 – 40 to + 85 Unit V °C Rev. A2: 08.06.1995 3 (13) U2795B Electrical Characteristics TELEFUNKEN Semiconductors VS = 3 V, fLOi = 1 GHz, IF = 900 MHz, RF = 100 MHz, RP = , system impedance Zo = 50 W, Tamb = 25°C, RT = 56 W reference point Pin 6, unless otherwise specified Parameters Supply voltage range Typical supply current range 1 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 Test Conditions / Pin Pin 1 Pin 1 Pin 1 RL = 50 W, RT = RL = 50 W, RT = 56 W Symbol VS IS IS PGC PGC RFi fLOi fIFo 10 50 50 Min. 2.7 4 Typ. Max. 5.5 11 13 9 4 2500 2500 2500 Unit V mA mA dB dB MHz MHz MHz R R Pin 2 Pin 7 Pin 5 Pin 7 to 2 PiLO = –10 to 0 dBm Pin 2 to 7 PiRF = –25 dBm Pin 7 to 5, PiLO = – 10 to 0 dBm Pin 5 to 7 ISLO-RF ISRF-LO ISLO-IF ISIF-LO CPo ZRFi CPi IIP3 – 30 35 – 25 30 – 10 700Wk0.8pF – 14 –4 dBm dB dBm dB dBm IFo to LOi Output (IF) Output compression point Pin 5 Input (RF) Input impedance Pin 2 Input compression point Pin 2 Third order input Pin 2 intercept point Input (LO) LO level Pin 7 Voltage standing wave ratio (VSWR) Input LO Pin 7 Output IF Pin 4 Noise performance Noise figure PiLO = 0 dBm, RT = Power down mode Supply current Pin 1 VPD < 0.5 V Pin 1 VPD = 0 V Power down voltage “Power ON” Pin 8 VS = 3.5 to 5.5 V VS = 2.7 to 3.5 V “Power DOWN” Pin 8 Power down current Pin 8 Power ON Power DOWN Settling time Pin 8 to 5 W dBm dBm PiLO VSWRLOi VSWRIFo NF ISPD –6