RF9938

RF9938 6 Typical Applications • CDMA/TDMA/DCS1900 PCS Systems • PHS 1500/ WLAN 2400 Systems • General Purpose Upconverter • BPSK Modulation • Micro-Cell PCS Base Stations • Portable Battery-Powered Equipment PCS UPCONVERTER/BPSK MODULATOR Product Description The RF9938 is a complete upconverter designed for PCS 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 is designed as part of the RFMD PCS CDMA Chip Set, consisting of a Transmit IF AGC Amp, this Transmit Upconverter, a Receive LNA/Mixer, and a Receive IF AGC Amp. 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". Optimum Technology Matching® Applied Si BJT Si Bi-CMOS ü Package Style: SOIC-8 GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features • Supports Dual Mode Operation • +8dBm 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 RF9938 RF9938 PCBA PCS 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 A3 010720 6-61 MIXERS RF9938 Absolute Maximum Ratings Parameter Supply Voltage Input RF Power Operating Ambient Temperature Storage Temperature Rating -0.5 to +7.0 +6 -30 to +80 -30 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 Output VSWR Spurious Product Rejection MIXERS Specification Min. Typ. Max. Unit Condition T=25°C, VCC =3.6V, RF out=1880MHz, LO=1750MHz @ -3dBm, IF=130MHz @ -10dBm in -3.8 +5 6 1200 to 2500 -2.8 14 +8 -64 1.5:1 30 DC to 200 265 30 30 1000 to 2700 -6 to 0 -30 30 2:1 3.6±5% 27 -1.0 MHz dB dB dBm dB dBc MHz Ω dB dB MHz dBm dBm dB PIN =-13dBm per Tone Referenced to a 1.23MHz in-band power. At ±1.25MHz Offset (CDMA PIN =-10dBm) 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 33 6-62 Rev A3 010720 RF9938 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. 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 as 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. Interface Schematic 2 3 4 IFGND LO+ 5 6 7 LOGND VCC 6 MIXERS RF OUT 8 RF OUT Application Schematic 1 nF IF+ 1 nF IF2 3 33 pF LO IN 4 5 7 47 pF 6 10 pF 100 nF 1 8 VCC Rev A3 010720 6-63 RF9938 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) P1 P1-1 1 2 NC 3 VCC GND Drawing 9938400 Rev IF IN SMA J1 C3 8 pF C2 1 nF LO IN C1 T1 1 nF 1:4 SETUP RF OUT SMA J3 C7 100 nF P1-1 50 Ω µ strip 1 2 3 4 8 7 6 5 C5 .9 pF (ATC) C6 47 pF 6 MIXERS SMA J2 50 Ω µ strip C4 33 pF Evaluation Board Layout 1.4” x 1.4” 6-64 Rev A3 010720