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| RF2608 6 Typical Applications * CDMA/FM Cellular Systems * Supports Dual-Mode AMPS/CDMA * Supports Dual-Mode TACS/CDMA * Commercial and Consumer Systems * Battery-Operated Systems CDMA/FM UPCONVERTER/BPSK MODULATOR Product Description -A- The RF2608 is a complete upconverter designed for CDMA/FM cellular applications. The IC contains a double-balanced mixer stage and an output buffer amplifier stage. This device may also be used to directly BPSK modulate a carrier. The mixer is a Gilbert cell with emitter degeneration resistors to provide high IP3. The output stage is a class-B, push-pull configuration to reduce the overall current and still provide a good 50 output match. The unit operates at a supply voltage of 2.7V to 5.0V and does not require any external matching components other than coupling capacitors. This circuit is designed as part of the RFMD CDMA chipset, consisting of a Transmit IF AGC Amp, this Transmit Upconverter, a Receive LNA/ Mixer, and a Receive IF AGC Amp. Optimum Technology Matching(R) Applied 0.008 0.004 0.018 0.014 0.196 0.189 0.050 6 0.157 0.150 0.244 0.229 Dimensions in mm 0.068 0.053 8 MAX 0 MIN 0.034 0.016 0.009 0.007 NOTES: 1. Shaded lead is Pin 1. 2. All dimensions are excluding mold flash. 3. Lead coplanarity 0.005 with respect to datum "A". u Package Style: SOIC-8 Si BJT Si Bi-CMOS GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features * Supports Dual Mode Operation * +7dBm Output Intercept Point * Single 2.7V to 5.0V Power Supply IF+ IFGND LO BYPASS 1 2 3 4 8 7 6 5 RF OUT VCC GND LO * Internally Matched Inputs and Outputs * Buffered Output * Double-Balanced Mixer Ordering Information RF2608 RF2608 PCBA CDMA/FM Upconverter/BPSK Modulator Fully Assembled Evaluation Board Functional Block Diagram RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev B3 010720 6-15 MIXERS RF2608 Absolute Maximum Ratings Parameter Supply Voltage Input RF Power Operating Ambient Temperature Storage Temperature Rating -0.5 to 7 +10 -40 to +85 -40 to +150 Unit VDC dBm C C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Parameter Overall RF Output Frequency Range Conversion Gain Noise Figure Output IP3 Output VSWR Spurious Product Rejection Specification Min. Typ. Max. Unit Condition T=25C, VCC =3.6V, RF=840MHz, LO=970MHz @ -2 dBm, IF=130MHz @ -12 dBm 500 -1.3 +5 6 MIXERS 824 to 849 +0.5 15 +7 1.6:1 30 130 265 23 50 954 to 979 -3 to +3 -28 <1.1:1 2.7 to 5.0 22 1500 +1.6 18 2.0:1 MHz dB dB dBm dBc 50 Referenced to RF output IF Input IF Frequency Differential Input Impedance IF to RF Output Isolation IF to LO Isolation DC 215 21 40 300 200 315 MHz dB dB MHz dBm dBm 50 V mA IF=130MHz LO Input LO Frequency Range LO Level LO to RF Output Leakage LO Input VSWR -25 2.0:1 Power Supply Voltage Current Consumption 16 28 VCC =3.6V 6-16 Rev B3 010720 RF2608 Pin 1 Function IF+ Description Balanced IF input pin. This pin is internally DC-biased and should be DC blocked if connected to a device with a DC level present. For singleended input operation, one pin is used as an input and the other IF input is AC coupled to ground. The balanced, as well as single-ended, input impedance is 265. The IF input should be used differentially when the part is used as a BPSK modulator. Same as pin 1, except complementary input. Ground connection. For best performance, keep traces physically short and connect immediately to ground plane. Bypass connection for the LO. A capacitor of 100pF to ground should be connected to this pin Interface Schematic IF+ IF- BIAS 2 3 4 IFGND LO BYPASS See pin 1. LO LO BYPASS BIAS 5 LO 6 7 GND VCC Balanced LO input pin. This pin is internally DC-biased and should be See pin 4. DC-blocked if connected to a device with a DC level present. For singleended input operation, one pin is used as an input and the other LO input is AC-coupled to ground. The balanced, as well single-ended, input impedance is 50. Same as pin 3. Supply voltage pin. External bypassing is required. External RF, LO, and IF bypassing is required. The trace length between the pin and the bypass capacitors should be minimized. The ground side of the bypass capacitors should connect immediately to ground plane. RF output pin. This pin is internally DC-blocked. The output impedance is 50. 6 MIXERS RF OUT 8 RF OUT Application Schematic 1 nF IF+ 1 nF IF2 3 100 pF 4 5 100 pF LO 7 100 pF 6 100 nF 1 8 VCC RF OUT Rev B3 010720 6-17 RF2608 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) 50 strip L1 100 nH C3 4 pF C1 470 pF 1 T1 1:1 C2 470 pF C4 22 pF VCC GND NC 2 3 4 P1 P1-1 1 2 3 8 7 6 5 C5 22 pF C6 47 pF C7 100 nF 50 strip J2 LO IN 50 strip J1 IF IN J3 RF OUT VCC 2608400A 6 MIXERS Evaluation Board Layout Board Size 1.420" x 1.420" Board Thickness 0.031", Board Material FR-4 6-18 Rev B3 010720 |
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