RF2608 6 CDMA/FM UPCONVERTER/BPSK MODULATOR Typical Applications • CDMA/FM Cellular Systems • Commercial and Consumer Systems • Supports Dual-Mode AMPS/CDMA • Battery-Operated Systems • Supports Dual-Mode TACS/CDMA Product Description -A0.008 0.004 0.018 0.014 0.050 0.157 0.150 ü GaAs HBT GaAs MESFET Si Bi-CMOS SiGe HBT Si CMOS Dimensions in mm 0.244 0.229 8° MAX 0° MIN Optimum Technology Matching® Applied Si BJT 6 0.196 0.189 0.034 0.016 0.009 0.007 MIXERS 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 50Ω 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. 0.068 0.053 NOTES: 1. Shaded lead is Pin 1. 2. All dimensions are excluding mold flash. 3. Lead coplanarity 0.005 with respect to datum "A". Package Style: SOIC-8 Features • Supports Dual Mode Operation • +7dBm Output Intercept Point • Single 2.7V to 5.0V Power Supply IF+ 1 8 RF OUT • Internally Matched Inputs and Outputs IF- 2 7 VCC • Buffered Output GND 3 6 GND • Double-Balanced Mixer LO BYPASS 4 5 LO Ordering Information RF2608 RF2608 PCBA Functional Block Diagram Rev B3 010720 CDMA/FM Upconverter/BPSK Modulator Fully Assembled Evaluation Board RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 6-15 RF2608 Absolute Maximum Ratings Parameter Supply Voltage Input RF Power Operating Ambient Temperature Storage Temperature Parameter Rating Unit -0.5 to 7 +10 -40 to +85 -40 to +150 VDC dBm °C °C Specification Min. Typ. Max. 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). Unit T=25°C, VCC =3.6V, RF=840MHz, LO=970MHz @ -2 dBm, IF=130MHz @ -12 dBm Overall 6 RF Output Frequency Range Conversion Gain Noise Figure Output IP3 Output VSWR Spurious Product Rejection Condition 500 -1.3 +5 824 to 849 +0.5 15 +7 1.6:1 30 1500 +1.6 18 MHz dB dB dBm 2.0:1 dBc 50Ω Referenced to RF output MIXERS IF Input IF Frequency Differential Input Impedance IF to RF Output Isolation IF to LO Isolation DC 215 21 40 130 265 23 50 200 315 300 954 to 979 -3 to +3 -28 <1.1:1 -25 2.0:1 2.7 to 5.0 22 28 MHz Ω dB dB IF=130MHz LO Input LO Frequency Range LO Level LO to RF Output Leakage LO Input VSWR MHz dBm dBm 50Ω Power Supply Voltage Current Consumption 6-16 16 V mA VCC =3.6V Rev B3 010720 RF2608 Pin 1 Function IF+ Description Interface Schematic 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 265Ω. The IF input should be used differentially when the part is used as a BPSK modulator. IF+ IF- BIAS 2 3 IFGND 4 LO BYPASS Same as pin 1, except complementary input. See pin 1. 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 LO BYPASS LO BIAS LO 6 7 GND VCC 8 RF OUT 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 50Ω. Same as pin 3. 6 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 50Ω. MIXERS 5 RF OUT Application Schematic 1 nF IF+ RF OUT 1 8 2 7 3 6 4 5 VCC 1 nF IF- 100 pF 100 nF 100 pF LO 100 pF Rev B3 010720 6-17 RF2608 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) J1 IF IN 50 Ω µstrip L1 100 nH C3 4 pF C1 470 pF T1 1:1 C2 470 pF C4 22 pF P1 P1-1 6 1 VCC 2 GND 3 NC 50 Ω µstrip 1 8 2 7 3 6 4 5 VCC C6 47 pF C7 100 nF 50 Ω µstrip 2608400A J3 RF OUT C5 22 pF J2 LO IN Evaluation Board Layout Board Size 1.420" x 1.420" MIXERS Board Thickness 0.031”, Board Material FR-4 6-18 Rev B3 010720