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| RF2484Direct Quadrature Modulator RF2484 DIRECT QUADRATURE MODULATOR RoHS Compliant & Pb-Free Product Package Style: QFN, 16-pin, 4x4 QREF Features Typical Carrier Suppression>35dBc, Sideband Suppression>35dBc over temperature with highly linear operation Noise Floor better than 152dBm/Hz from 800MHz to 2200MHz Single 5V Power Supply 1 GND 2 16 15 14 GND 3 LO 4 5 GND 6 VCC -45 +45 7 PD 8 RF OUT Applications Dual-Band CDMA Base Stations TDMA/TDMA-EDGE Base Stations GSM-EDGE/EGSM Base Stations W-CDMA Base Stations WLAN and WLL Systems GMSK,QPSK,DQPSK,QAM Modulation Functional Block Diagram Product Description The RF2484 is a monolithic integrated quadrature modulator IC capable of universal direct modulation for high-frequency AM, PM, or compound carriers. This low-cost IC features excellent linearity, noise floor, and over-temperature carrier suppression performance. The device implements differential amplifiers for the modulation inputs, 90 carrier phase shift network, carrier limiting amplifiers, two matched double-balanced mixers, summing amplifier, and an output RF amplifier which will drive 50 from 800MHz to 2500MHz. It is packaged in a small industry-standard QFN 16-pin plastic package. Ordering Information RF2484 RF2484PCBA-410 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 A7 DS061115 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. GND QSIG 13 12 GND 11 GND 10 VCC 9 IREF GND ISIG 1 of 12 RF2484 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature Rating -0.5 to +7.5 +10 -40 to +85 -40 to +150 Unit VDC 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. Parameter LO Input Frequency Range Power Level Input Impedance Min. Specification Typ. Max. Unit Condition T=25C, VCC =5V, VREF =4.1V; I and Q driven single-ended 800 -6 45-j95 52-j54 58-j50 63-j40 2500 +6 MHz dBm At 880MHz At 1960MHz At 2140MHz At 2400MHz Modulation Input Frequency Range Reference Voltage (VREF) Input Resistance Input Bias Current DC 4.1 30 40 250 MHz V k A LO= -5dBm at 880MHz; Single sideband testing unless otherwise noted -12 -72 50 35 50 35 -152.5 2.3 1 .9993 28-j72 dBm dBc dBc dBc dBc dBc dBm/Hz % RMS For ACPR=-72dBc; I&Q Amplitude=1.1VPP (single-ended) Channel Power=-12dBm; see Test Setup for detailed information T=25C; POUT =-10dBm; optimized I,Q DC offsets Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-10dBm T=25C; POUT =-10dBm; optimized I,Q amplitude and phase balance Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-10dBm At 20MHz offset, 30kHz res BW, VCC =5V; ISIG, QSIG, IREF, and QREF tied to VREF See Test Setup for detailed information See Test Setup for detailed information See Test Setup for detailed information RF Output (880MHz) CDMA Output Channel Power CDMA ACPR Carrier Suppression Carrier Suppression over Temperature Sideband Suppression Sideband Suppression over Temperature Broadband Noise Floor EVM Phase Error Rho Output Impedance 2 of 12 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 A7 DS061115 RF2484 Parameter RF Output (1960MHz) PCS CDMA Output Power PCS CDMA ACPR Carrier Suppression Carrier Suppression over Temperature Sideband Suppression Sideband Suppression over Temperature Broadband Noise Floor EVM Phase Error Rho Output Impedance 50 35 50 35 -154.5 2.3 1 .9988 46-j22 LO= -5dBm at 2140MHz; Single sideband testing unless otherwise noted -16 -60 50 35 50 35 -152 5.9 2.4 .9961 58-j16 100 50 2.8 1.0 1.2 ns k V V Threshold voltage Threshold voltage dBm dBc dBc dBc dBc dBc dBm/Hz % RMS For ACPR=-60dBc; I&Q Amplitude=1.4VPP (single-ended) Channel Power=-16dBm; see Test Setup for detailed information T=25C; POUT =-13dBm; optimized I,Q DC offsets Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm T=25C; POUT =-13dBm; optimized I,Q amplitude and phase balance Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm At 20MHz offset, 30kHz res BW, VCC =5V; ISIG, QSIG, IREF, and QREF tied to VREF See Test Setup for detailed information See Test Setup for detailed information See Test Setup for detailed information -13 -72 dBm dBc dBc dBc dBc dBc dBm/Hz % RMS Min. Specification Typ. Max. Unit Condition LO=-5dBm at 1960MHz; Single sideband testing unless otherwise noted For ACPR=-72dBc; I&Q Amplitude=1.2VPP (single-ended) Channel Power=-13dBm; see Test Setup for detailed information T=25C; POUT =-13dBm; optimized I,Q DC offsets Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm T=25C; POUT =-13dBm; optimized I,Q amplitude and phase balance Temperature cycled from -40C to +85C after optimization at T=25C; POUT =-13dBm At 20MHz offset, 30kHz res BW, VCC =5V; ISIG, QSIG, IREF, and QREF tied to VREF See Test Setup for detailed information See Test Setup for detailed information See Test Setup for detailed information RF Output (2140MHz) W-CDMA Output Channel Power W-CDMA ACPR Carrier Suppression Carrier Suppression over Temperature Sideband Suppression Sideband Suppression over Temperature Broadband Noise Floor EVM Phase Error Rho Output Impedance Power Down Turn On/Off Time PD Input Resistance Power Control "ON" Power Control "OFF" Rev A7 DS061115 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 12 RF2484 Parameter Power Supply Voltage 4.5 Current 66 5.0 6.0 70 25 V V mA A Power Down Specifications Operating Limits Min. Specification Typ. Max. Unit Condition 4 of 12 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 A7 DS061115 RF2484 Pin 1 2 3 4 5 6 7 Function GND GND GND LO GND VCC PD Description Ground connection. This pin should be connected directly to the ground plane. Same as pin 1. Same as pin 1. The input of the phase shifting network. This pin has an internal DC blocking capacitor. This port is voltage-driven so matching at different frequencies is generally not required. Same as pin 1. Power supply. An external capacitor is needed if no other low frequency bypass capacitor is nearby. Power Down control. When this pin is "low," all circuits are shut off. A "low" is typically 1.2V or less at room temperature.When this pin is "high" (VCC), all circuits are operating normally. If PD is below VCC, output power and performance will be degraded. Operating in this region is not recommended, although it might be useful in some applications where power control is required. RF Output. This pin has an internal DC blocking capacitor. At some frequencies, external matching may be needed to optimize output power. A small amount of DC current may be present at this output. As a result, if the voltage at this pin is measured using a high impedance probe, some DC voltage may be observed at this output. Interface Schematic L O V CC PD 200 8 RF OUT RF OUT 9 10 11 12 13 GND VCC GND GND Q SIG Same as pin 1. Same as pin 6. Same as pin 1. Same as pin 1. Baseband input to the Q mixer. This pin is DC coupled. The input drive level determines output power and linearity performance; for better carrier suppression, 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 4.1V. For optimum carrier suppression, the DC voltages on I REF, Q REF, I SIG and Q SIG should be adjusted slightly to compensate for inherent undesired internal DC offsets; for optimum sideband suppression, phase and signal amplitude on IREF, Q REF, I SIG and Q SIG should be adjusted slightly to compensate for inherent undesired internal offsets. See RFMD AN0001 for more detail. Baseband input to the I mixer. This pin is DC coupled. The input drive level determines output power and linearity performance; for better carrier suppression, 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 4.1V; see pin 13 for more information. V CC 100 1p 14 I SIG V CC 100 1p 15 I REF Reference voltage for the I mixer. This voltage should be the same as the DC voltage supplied to the I SIG pin. A voltage of 4.1V is recommended; see pin 13 for more information. 100 V CC 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. This will increase the gain. 1p Rev A7 DS061115 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 12 RF2484 Pin 16 Function Q REF Description Reference voltage for the Q mixer. This voltage should be the same as the DC voltage supplied to the Q SIG pin. A voltage of 4.1V is recommended; see pin 13 for more information. Interface Schematic V CC 100 1p Pkg Base GND Ground connection. The package base should be connected to the ground plane. Package Drawing -B- 0.10 C B 0.10 C B 4.00 2.00 2 PLCS 3.75 2 PLCS 0.80 TYP 2 A 1.60 2 PLCS 3.75 0.75 0.50 INDEX AREA 1.50 SQ. 4.00 0.10 C A 2 PLCS 0.45 0.28 3.20 2 PLCS 2.00 0.10 C A 2 PLCS 0.10 M C A B 12 MAX 0.05 0.00 1.00 0.90 Dimensions in mm. C 0.05 Shaded pin is lead 1. 0.75 0.65 6 of 12 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 A7 DS061115 RF2484 CDMA/W-CDMA Test Setup Rohde & Schwarz AMIQ 1110.2003.02 Hewlett-Packard 8665B I SIG LO IN I REF Q SIG Q REF Rohde & Schwarz FSIQ 1119.6001.26 RF2484 Evaluation Board Agilent 66332A VCC VPD RF OUT Agilent 89441 Vector Signal Analyzer General The above setup was used to evaluate the RF2484 under CDMA and W-CDMA modulation conditions. An AMIQ was required to provide the appropriate DC reference voltage (4.1V) for the I and Q pins. I and Q were driven single-endedly; differential drive may improve performance. A PC-controlled Rohde & Schwarz AMIQ generated the CDMA I and Q signals. In order to reduce AMIQ noise contributions to adjacent channel power, W-CDMA baseband signals were filtered using a high order low pass filter before application to the RF2484. EVM, Phase Error, and Rho To measure EVM, phase error, and Rho, signals were generated using the AMIQ and decoded with the Agilent VSA. For CDMA Cellular and PCS, I and Q input signals were generated with the Pilot Channel active, 32x oversampling and base station equifilters. For W-CDMA, the Common Pilot Channel was active with 8x oversampling and a root cosine filter. In all cases, relative signal amplitude levels were adjusted to optimize signal quality. CDMA Modulation Setup (Cellular and PCS) To measure ACPR, I and Q input signals were generated using the following settings: * Pilot Channel active * Sync Channel active * Paging Channel active * 6 Traffic Channels active * 32x Oversampling * Base Station equifilter W-CDMA Modulation Setup To measure W-CDMA ACPR, I and Q input signals were generated using the following settings in the AMIQ: * P-CPICH (Common Pilot Channel) active * P-SCH (Sync Channel) active * P-CCPCH (Primary Common Control Physical Channel) active * P-ICH (Page Indicator Channel) Active * DL-DPCCH (Dedicated Physical Control Channel) active * 6 DPCH (Dedicated Physical Channels) active * 8x Oversampling Rev A7 DS061115 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 12 RF2484 Application Schematic 3 pF IREF QREF 3 pF 100 nF 1 2 100 nF ISIG QSIG 16 15 14 13 12 11 -45 +45 3 LO 4 5 6 10 7 8 9 100 nF 100 nF VCC 3 pF VCC PD 100 nF RF OUT 8 of 12 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 A7 DS061115 RF2484 Evaluation Board Schematic NOTES: 1. R1 is installed for non-independent control of I and Q reference voltages. R1a gives independent control of reference voltages. 2. Components with * following the reference designator should not be populated on the evaluation board. R1a* 0 R1 0 C5 3 pF C6 100 nF P1 P1-1 1 2 3 CON3 VCC GND GND P2-3 P2-1 P2 1 2 3 CON3 J3 ISIG J4 QSIG U1 1 2 VREF/QREF GND IREF IREF VREF/QREF C7 3 pF C8 100 nF 16 15 14 13 12 11 -45 +45 3 J2 LO 4 5 6 10 7 8 9 2484400- VCC C3 3 pF C4 100 nF VCC C1 3 pF C2 100 nF J1 RFOUT Rev A7 DS061115 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. 9 of 12 RF2484 Evaluation Board Layout Board Size 2.0" x 2.0" Board Thickness 0.028", Board Material FR-4 10 of 12 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 A7 DS061115 RF2484 -20 RF2484 Cellular CDMA Spectra at Various Output Levels (ACPR @ 885kHz, Vcc = 5.0V, Vref = 4.1V, T = 25C) -20 RF2484 PCS CDMA Spectra at Various Output Levels (ACPR @ 885 kHz, Vcc = 5.0V, Vref = 4.1V, T = 25C) -30 -30 -40 Note: Below ~-90dBm, test setup noise inhibits accurate ACP measurement. CP = -9.5 dBm; ACPR = -68 dBc -40 CP = -11.1 dBm; ACPR = -71 dBc CP = -12.9 dBm; ACPR = -72 dBc CP = -14.3 dBm; ACPR = -73 dBc Power (dBm) -60 Power (dBm) -50 CP = -10.6 dBm; ACPR = -70 dBc CP = -12.0 dBm; ACPR = -72 dBc CP = -14.7 dBm; ACPR = -73 dBc -50 -60 -70 -70 -80 -80 -90 -90 -100 877.5 878 878.5 879 879.5 880 880.5 881 881.5 882 882.5 -100 1957.5 1958 1958.5 1959 1959.5 1960 1960.5 1961 1961.5 1962 1962.5 Frequency (MHz) Frequency (MHz) 5 RF2484 Output Power versus I, Q Input Voltage Level (Vcc = 5.0V, Vref = 4.1V, T = 25C, Single Sideband) -5 RF2484 Output Channel Power vs I, Q Input Voltage Level (Vcc = 5.0V, Vref = 4.1V, T = 25C, CDMA/W-CDMA Mod.) 0 -10 -5 Output Channel Power (dBm) SSB Output Power (dBm) -15 -10 880 MHz 1960 MHz -15 2140 MHz -20 880 MHz CDMA Signal 1960 MHz CDMA Signal -25 2140 MHz W-CDMA Signal -20 0 200 400 600 800 1000 1200 1400 1600 -30 250 500 750 1000 1250 1500 1750 2000 2250 2500 I, Q Input Voltage Level (mVp) I, Q Input Voltage Level (mVpp) Rev A7 DS061115 7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com. 11 of 12 RF2484 12 of 12 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 A7 DS061115 |
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