RF9908

RF9908 6 Typical Applications • CDMA/FM Cellular Systems • Supports Dual-Mode AMPS/CDMA • Supports Dual-Mode TACS/CDMA • Commercial and Consumer Systems • 3-Cell Battery-Operated Systems CDMA/FM UPCONVERTER/BPSK MODULATOR Product Description The RF9908 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 Ω output match. The unit operates at 3.6V and does not require any external matching components other than coupling capacitors. This circuit is designed as part of the RFMD CDMA Chip Set, consisting of a Transmit IF AGC Amp, this Transmit Upconverter, a Receive LNA/Mixer, and a Receive IF AGC Amp. Optimum Technology Matching® Applied Si BJT Si Bi-CMOS 0.008 0.004 0.018 0.014 -A- 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". ü Package Style: SOIC-8 GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features • Supports Dual Mode Operation • +8dBm Input/Output Intercept Point • Single 3.6V Power Supply • Internally Matched Inputs and Outputs • Buffered Output • Double-Balanced Mixer IF+ 1 IF- 2 GND 3 LO+ 4 8 RF OUT 7 VCC 6 GND 5 LO- Ordering Information RF9908 RF9908 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 A2 010720 6-57 MIXERS RF9908 Absolute Maximum Ratings Parameter Supply Voltage Input RF Power Operating Ambient Temperature Storage Temperature Rating -0.5 to 7.0 +6 -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 ACP Specification Min. Typ. Max. 500 to 1500 0 14 +8 -54 -75 1.5:1 30 DC to 200 265 30 30 300 to 1700 -6 to 0 -30 30 2:1 3.6±5% 18 Unit Condition T=25°C, VCC =3.6V, RF=840MHz, LO=970MHz, IF=130MHz MHz dB dB dBm dB dB Over temperature and frequency 6 MIXERS Output ALT Output VSWR Spurious Product Rejection dBc MHz Ω dB dB MHz dBm dBm dB Referenced to a 1.23MHz in-band power. (±885kHz offset) Referenced to a 1.23MHz in-band power. (±1.98MHz offset) 50 Ω Referenced to RF output IF Input IF Frequency Differential Input Impedance IF to RF Output Isolation IF to LO Isolation LO Input LO Frequency Range LO Level LO to RF Output Leakage RF to LO Isolation LO Input VSWR -20 50 Ω V mA Power Supply Voltage Current Consumption 6-58 Rev A2 010720 RF9908 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 Ω. Interface Schematic IF+ IF- BIAS 2 3 4 IFGND LO+ Same as pin 1, except complementary input. Ground connection. Keep traces physically short and connect immediately to ground plane for best performance. Balanced LO 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 LO input is AC coupled to ground. The balanced, as well single-ended, input impedance is 50 Ω. Same as pin 4, except complementary input. 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 Ω. See pin 1. LO+ LO- BIAS 5 6 7 LOGND VCC See pin 4. 6 MIXERS RF OUT 8 RF OUT Application Schematic 1 nF IF+ 1 nF IF2 3 100 pF LO+ 4 5 100 pF 7 100 pF 6 100 nF 1 8 VCC RF OUT Rev A2 010720 6-59 RF9908 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) P1 P1-1 1 2 NC C1 2.2 nF 1 2 C2 2.2 nF 3 4 8 7 6 50 Ω Microstrip 5 C5 10 nF LO3 VCC GND 9908400 Rev - IF IN J1 C3 8 pF T1 1:4 50 Ω Microstrip RF OUT J3 P1-1 C6 47 pF C7 100 nF 6 MIXERS C4 10 nF Evaluation Board Layout Board Size 1.4” x 1.4” Board Thickness 0.031”, Board Material FR-4 6-60 Rev A2 010720