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| RF2422 5 Typical Applications * Digital Communications Systems * GMSK,QPSK,DQPSK,QAM Modulation * GSM, DCS 1800, JDC, D-AMPS Systems * Spread-Spectrum Communication Systems * Commercial and Consumer Systems 2.5GHZ DIRECT QUADRATURE MODULATOR Product Description The RF2422 is a monolithic integrated quadrature modulator IC capable of universal direct modulation for highfrequency AM, PM, or compound carriers. This low-cost IC 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. Component matching, which can only be accomplished with monolithic construction, is used to full advantage to obtain excellent amplitude balance and phase accuracy. 0.157 0.150 -A0.008 0.004 5 MODULATORS AND UPCONVERTERS 0.393 0.386 0.018 0.014 0.050 0.244 0.229 8 MAX 0 MIN 0.009 0.007 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". 0.034 0.016 Optimum Technology Matching(R) Applied Si BJT Si Bi-CMOS u Package Style: SOIC-16 GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features * Single 5V Power Supply * Integrated RF Quadrature Network * No Tuning Required * Low LO Input Level * Digitally Controlled Power Down Mode * 800MHz to 2500MHz Operation I REF 1 Q REF 2 GND2 3 GND2 4 GND2 5 LO 6 VCC1 7 PD 8 POWER CONTROL 16 I SIG 15 Q SIG 14 GND1 13 GND1 12 GND1 11 VCC2 10 GND1 9 RF OUT -45 +45 Ordering Information RF2422 RF2422 PCBA 2.5GHz Direct Quadrature 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 A5 010817 5-29 RF2422 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. 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 Carrier Input Frequency Range Power Level Input VSWR Specification Min. Typ. Max. 800 -6 5:1 1.8:1 1.2:1 DC 2.0 250 3.0 VREF 1.0 0.2 3 30 40 -3 50 3.5:1 1.3:1 1.15:1 -35 35 35 35 30 +3 2500 +6 Unit MHz dBm At 900MHz At 1800MHz At 2500MHz MHz V V dB k A Condition T=25C, VCC =5V 5 MODULATORS AND UPCONVERTERS Modulation Input Frequency Range Reference Voltage (VREF) Maximum Modulation (I&Q) Gain Asymmetry Quadrature Phase Error Input Resistance Input Bias Current RF Output Output Power Output Impedance Output VSWR dBm LO=2GHz and -5dBm, I&Q=2.0VPP, SSB At 900MHz At 2000MHz At 2500MHz dBc dB dB dB dB Harmonic Output Sideband Suppression Carrier Suppression IM3 Suppression -30 25 30 30 25 Broadband Noise Floor -145 -152 dBm/Hz dBm/Hz 100 50 2.8 1.0 1.2 5 4.5 Current 45 6.0 50 25 ns k V V V V mA A Intermodulation of the carrier and the desired RF signal Intermodulation of baseband signals At 20MHz offset, VCC =5V. Tied to VREF: ISIG, QSIG, IREF, and Q REF. At 850MHz At 1900MHz Power Down Turn On/Off Time PD Input Resistance Power Control "ON" Power Control "OFF" Threshold voltage Threshold voltage Specifications Operating Limits Operating Power Down Power Supply Voltage 5-30 Rev A5 010817 RF2422 Pin 1 Function I REF Description 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 3.0V is recommended. 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 balanced mode. This will increase the gain. Interface Schematic Q SIG 100 Q REF 100 425 425 2 Q REF 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 3.0V is recommended. Q SIG 100 Q REF 100 425 425 5 3 4 5 6 GND2 GND2 GND2 LO Ground connection of the LO phase shift network. This pin should be connected directly to the ground plane. Same as pin 3. Same as pin 3. The input of the phase shifting network. This pin has an internal DCblocking capacitor. At frequencies higher than 2GHz this port is wellmatched to 50. This port is voltage driven so matching at lower frequencies is not required. Power supply for all circuits except the RF output stage. 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. This is the 50 RF Output. This pin has an internal DC-blocking capacitor. At frequencies higher than 2GHz this port is well-matched. Typical impedances at lower frequencies are: 24-j30 @ 1GHz, 27-j10 @ 1.4GHz, 31-j3 @ 1.8GHz. At those frequencies, external matching may be needed to optimize output power. LO 7 8 VCC1 PD VCC 200 PD 9 RF OUT RF OUT 10 11 12 13 14 15 GND3 VCC2 GND1 GND1 GND1 Q SIG Ground connection for the RF output stage. This pin should be connected directly to the ground plane. Power supply for the RF Output amplifier. An external capacitor is needed if no other low frequency bypass capacitor is near by. Ground connection for the LO and baseband amplifiers, and for the mixers. This pin should be connected directly to the ground plane. Same as pin 12. Same as pin 12. Baseband input to the Q mixer. This pin is DC-coupled. Maximum output power is obtained when the input signal has a peak to peak amplitude of 2V. The recommended DC level for this pin is 3.0V. The peak minimum voltage on this pin (VREF - peak modulation amplitude) should never drop below 2.0V. The peak maximum voltage on this pin (VREF + peak modulation amplitude) should never exceed 4.0V. See pin 2. Rev A5 010817 5-31 MODULATORS AND UPCONVERTERS RF2422 Pin 16 Function I SIG Description Baseband input to the I mixer. This pin is DC-coupled. Maximum output power is obtained when the input signal has a peak to peak amplitude of 2V. The recommended DC level for this pin is 3.0V. The peak minimum voltage on this pin (VREF - peak modulation amplitude) should never drop below 2.0V. The peak maximum voltage on this pin (VREF + peak modulation amplitude) should never exceed 4.0V. Interface Schematic See pin 1. Application Schematic AC-Coupled VREF C R R 1 2 3 4 S 16 R R I SIG C Q SIG C 5 MODULATORS AND UPCONVERTERS 15 14 13 12 11 10 POWER CONTROL 9 100 nF LO IN VCC 5 6 VCC -45 +45 100 nF 7 8 RF OUT PD 100 nF NOTE: The values of R and C depend on the minimum baseband frequency (i.e., the cutoff frequency of this high pass filter should be lower than the lowest frequency component in the I/Q spectrum). 5-32 Rev A5 010817 RF2422 Application Schematic DC-Coupled VREF 1 100 nF 2 3 4 LO IN VCC 6 100 nF 7 8 PD 100 nF POWER CONTROL -45 +45 16 15 14 13 12 11 10 9 I SIG Q SIG 5 VCC 5 100 nF RF OUT Evaluation Board Schematic 1.5" x 1.5" (Download Bill of Materials from www.rfmd.com.) P1 P1-1 1 2 NC 3 VCC GND NC P2-1 P2 1 2 3 REF GND 50 strip P2-1 C1 100 nF 1 2 3 4 5 J1 LO IN P1-1 C2 100 nF 50 strip 6 7 8 POWER CONTROL -45 +45 16 15 14 13 12 11 10 9 C3 100 nF 50 strip J4 I SIG 50 strip J3 Q SIG P1-1 J2 RF OUT 2422400A Rev A5 010817 5-33 MODULATORS AND UPCONVERTERS RF2422 Evaluation Board Layout Board Size 1.510" x 1.510" Board Thickness 0.031", Board Material FR-4 5 MODULATORS AND UPCONVERTERS 5-34 Rev A5 010817 |
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