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| RF2850 DIRECT QUADRATURE MODULATOR RoHS Compliant & Pb-Free Product Package Style: QFN, 16-Pin, 4x4 QREF QSIG 14 Features Typical Carrier Suppression>40dBc Typical Sideband Suppression>40dBc Noise Floor better than 158dBm/Hz Single 5V Power Supply GND 1 LO 2 16 15 GND 13 12 RFOUT 11 GND 10 VCC 9 RFREF 8 GND VCC -45 +45 LOREF 3 GND 4 5 VCC 6 IREF 7 ISIG Applications UMTS Base Stations CDMA Base Stations GSM-EDGE/EGSM Base Stations WLAN and WLL Systems GMSK,QPSK,DQPSK,QAM Modulation Functional Block Diagram Product Description The RF2850 is a direct quadrature modulator for use in base stations and other communications systems. RF2850 supports PCS, GSM, EDGE, CDMA2000, and UMTS standards. This device features a narrow-band operation at 1700MHz to 2500MHz with excellent carrier and sideband suppression and ultra low noise floor. The device is manufactured on an advanced GaAs HBT process. The RF2850 operates from a single 5V supply and is packaged in a low cost 4mmx4mm 16-pin leadless package. Ordering Information RF2850Direct Quadrature Modulator RF2850 RF2850PCBA-41X Direct Quadrature Modulator Fully Assembled Evaluation Board Optimum Technology Matching(R) Applied GaAs HBT GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT RF MICRO DEVICES(R), RFMD(R), Optimum Technology Matching(R), Enabling Wireless ConnectivityTM, PowerStar(R), POLARISTM TOTAL RADIOTM and UltimateBlueTM are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. (c)2006, RF Micro Devices, Inc. Rev A0 DS050616 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. 1 of 8 RF2850 Absolute Maximum Ratings Parameter Supply Voltage LO Input Operating Temperature Storage Temperature Rating -0.5 to +5.3 +10 -40 to +85 -65 to +150 Unit V dBm C C Caution! ESD sensitive device. Exceeding any one or a combination of the Absolute Maximum Rating conditions may cause permanent damage to the device. Extended application of Absolute Maximum Rating conditions to the device may reduce device reliability. Specified typical performance or functional operation of the device under Absolute Maximum Rating conditions is not implied. RoHS status based on EUDirective2002/95/EC (at time of this document revision). The information in this publication is believed to be accurate and reliable. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended application circuitry and specifications at any time without prior notice. Specification Unit Min. Typ. Max. High Band Performance (1900MHz) with CW Baseband Inputs Parameter LO Input Port LO Drive Level LO Input Impedance LO Port Return Loss -5 50 13 DC 2.05 0.25 200 40 130 40 1700 -6 15 4 20 35 30 5 25 55 45 52 15 20 -158 -156 2500 250 dBm dB MHz V VP-P kHz k MHz A MHz dBm dB dBm dBc dBc dBc dBc dBm dBm/Hz Condition Modulation Input Frequency Range Reference Voltage Baseband Input Level I/Q Signal Input Impedance Bandwidth (-1dB) Input Bias Current Baseband common mode voltage 0.25VP-P per pin, 500mV VP-P differential, I/Q in quadrature CW baseband signal Measured at DC 500mV VP-P differential, I/Q at 2.05V DC I/Q Modulator Output RF Frequency Range RF Output Power RF Output Return Loss RF Output P1dB Carrier Suppression Carrier Suppression Sideband Suppression IM3 Suppression Output IP3 Broadband Noise Floor T=25C, VCC =5V Unadjusted (see note) Adjusted. T=-40C to +85C Unadjusted Two tone baseband input @ 500mVP-P differential per tone 20MHz offset from LO, all IQ input at bias of 2.05V Specification Operating limits DC Parameters Supply Voltage 4.75 Supply Current 60 5.0 5.25 V V mA Note: 20dBc limit for unadjusted carrier suppression is applicable for differential I and Q inputs only. 2 of 8 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. Rev A0 DS050616 RF2850 Specification Unit Min. Typ. Max. High Band Performance with PCS CDMA and W-CDMA Baseband Inputs Parameter W-CDMA 3GPP Channel Power ACPR @ 1960MHz SNR @ 1960MHz ACPR @ 2140MHz SNR @ 2140MHz Noise Floor @ 20MHz Offset -13 -68 -74 -65 -74 -156 -13 -72 -14 -74 -85 -157 -71 -82 -156 -70 -62 -70 -62 -70 -155 dBm dBc dBc dBc dBc dBm/Hz dBm dBc dBm dBc dBc dBm/Hz 20MHz offset from LO 20MHz offset from LO 1.2288MHz integrated bandwidth 30kHz integrated bandwidth 1MHz integrated bandwidth at adjacent channel 3.84MHz integrated bandwidth, ESG-D with LPF Condition PCS CDMA Channel Power ACPR @ 1960MHz W-CDMA 1MHz BW Channel Power ACPR @ 2140MHz SNR @ 2140MHz Noise Floor @ 20MHz Offset Rev A0 DS050616 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. 3 of 8 RF2850 Pin 1 2 3 4 5 6 Function GND LO LOREF GND VCC I REF Description Ground connection. LO input signal. This pin has an internal DC-blocking capacitor. This port is voltage-driven so matching at different frequencies is generally not required. The reference end of local oscillator. Ground connection. Power supply. An external capacitor is required. Reference voltage for the I mixer. The DC voltage should be the same as the DC supplied to I SIG (pin 7). See pin 7 for more information. The SIG and REF inputs are inputs of a differential amplifier. Therefore, the REF and SIG inputs are interchangeable. If swapping the I SIG and I REF pins, the Q SIG and Q REF also need to be swapped to maintain the correct phase. It is also possible to drive the SIG and REF inputs in a differential mode which will increase gain. Baseband input to the I mixer. This pin is DC-coupled. The input drive level determines output power and linearity performance. For better carrier/sideband suppression and dynamic range, the drive level should be as high as possible to meet the required linearity performance. The recommended DC level for this pin is 2.05V. V CC Interface Schematic L O 2 pF 7 I SIG V CC 2 pF 8 9 10 11 12 GND RFREF VCC GND RF OUT Ground connection. The reference end of RF input. Power supply. An external capacitor is required. Ground connection. RF Output. This pin has an internal DC-blocking capacitor. At some frequencies, external matching may be needed to optimize output power. RF OUT 13 14 GND Q SIG Ground connection. Baseband input to the Q mixer. This pin is DC-coupled. The input drive level determines the output power and linearity performance. For better carrier/sideband suppression and dynamic range, the drive level should be as high as possible to meet the required linearity performance. The recommended DC level for this pin is 2.05V. V CC 2 pF 15 Q REF Reference voltage for the Q mixer. See pin 14 for more information. V CC 2 pF 16 Pkg Base VCC GND Power supply. An external capacitor is required. Ground connection. 4 of 8 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. Rev A0 DS050616 RF2850 Package Drawing -A2 PLCS 0.10 C A 0.05 C 4.00 SQ . 2.00 TYP 0.10 C B 2 PLCS 0.70 0.65 0.90 0.85 0.05 0.00 12 M AX 0.10 C B 2 PLCS -B- 1.87 TYP 3.75 SQ 0.10 C A 2 PLCS -C- SEATING PLANE Shaded lead is pin 1. Dim ensions in m m. 0.10 M C A B 0.60 0.24 TYP 0.35 0.23 Pin 1 ID 0.20 R 2.25 SQ . 1.95 0.75 TYP 0.50 0.65 Rev A0 DS050616 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. 5 of 8 RF2850 Evaluation Board Schematic 1700MHz to 2500MHz (Differential Drive) J2 QREF 50 strip 50 strip J4 QSIG VCC1 C9 100 pF L1 1 nH 1 2 -45 16 15 14 13 12 11 C12 3.9 pF C14 0.5 pF 50 strip J6 RF OUT J1 LO 50 strip X1 2.1 GHz L2 1 nH +45 3 4 5 6 7 8 10 9 C13 3.9 pF X2 2.1 GHz VCC C10 100 pF VCC2 J3 IREF VIN 50 strip P1 C1 2.2 pF L3 100 nH VCC1 L4 100 nH VCC2 C3 100 pF 50 strip J5 ISIG 6 of 8 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. Rev A0 DS050616 RF2850 Evaluation Board Layout Board Size 2.00" x 2.00" Board Thickness 0.042" (10%), Board Material FR-4 Rev A0 DS050616 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. 7 of 8 RF2850 8 of 8 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. Rev A0 DS050616 |
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