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| RF2424 5 Typical Applications * Digital Communications Systems * GMSK,QPSK,DQPSK,QAM Modulation * GSM and D-AMPS Systems * Image-Reject Upconverters * Spread Spectrum Communication Systems * AM, SSB, DSB Modulation UHF QUADRATURE MODULATOR Product Description The RF2424 is a monolithic integrated quadrature modulator IC capable of universal direct modulation for highfrequency AM, PM, or compound carriers. Maximum output power is +7.5dBm, which is achieved with low input I and Q signal levels. 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 700MHz to 1000MHz. 0.157 0.150 0.012 0.008 0.196 0.189 0.025 -A0.0098 0.0040 5 MODULATORS AND UPCONVERTERS 0.2440 0.2284 0.0688 0.0532 8 MAX 0MIN 0.050 0.016 0.0098 0.0075 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(R) Applied u Package Style: SSOP-16 Si BJT Si Bi-CMOS GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features * Single 2.7V to 5.5V Power Supply * +7.5dBm Output Power * No Tuning Required * Low LO Input Level * Digitally Controlled Power Down Mode * 700MHz to 1000MHz Operation I REF 1 Q REF 2 VCC1 3 MIXOUT 4 GND1 5 GND1 6 LO 7 GND3 8 -45 +45 16 ISIG POWER CONTROL 15 QSIG 14 GND1 13 VCC2 12 PD 11 GND1 10 GND2 9 RFOUT Ordering Information RF2424 RF2424 PCBA UHF 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 A6 010817 5-43 RF2424 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature Rating 5.5 +6.0 -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 impedance Specification Min. Typ. Max. 700 -6 43 + j1.8 DC 1.6 VREF 0.3 0.2 1 40 40 100 1000 +6 Unit MHz dBm MHz V V dB k A Condition T=25 C, VCC =3V 5 MODULATORS AND UPCONVERTERS At 900MHz Modulation Input Frequency Range Reference Voltage (VREF) Maximum Modulation (I&Q) Gain Asymmetry Quadrature Phase Error Input DC Resistance Input Bias Current RF Output Output Power Output Impedance Broadband Noise Floor Sideband Suppression Carrier Suppression IM3 Suppression +5.0 +7.5 50 -140 35 30 30 100 10 1.0 2.7 45 53 VCC 1.2 5.5 55 10 dBm dBm/Hz dB dB dB ns k V V V mA mA A VCC =3V, LO power=-3dBm, LO freq=900MHz, I/Q drive level=0.2VP, SSB 25 25 25 DSB output (+9dBm total power) Power Down Turn On/Off Time PD Input Resistance Power Down "ON" Power Down "OFF" Power Supply Voltage Current Power Down VCC =3V VCC =5V 5-44 Rev A6 010817 RF2424 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 1.6V 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. If single ended operation is desired then the input is applied to I SIG, pin 16. In that case, I REF and Q REF are tied together and AC coupled to ground. To obtain a carrier suppression of better than 40dB, I REF may be tuned 20mV relative to the I SIG. Without tuning, it will typically be better than 25dB. 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 1.6V is recommended. The SIG and REF inputs are inputs of a differential amplifier. Therefore the REF and SIG inputs are interchangeable. If swapping the Q SIG and Q REF pins, the I SIG and I 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. If single ended operation is desired then the input is applied to Q SIG, pin 15. In that case, Q REF and Q REF are tied together and AC coupled to ground. To obtain a carrier suppression of better than 40dB, Q REF may be tuned 20mV relative to the Q SIG. Without tuning, it will typically be better than 25dB. Power supply for the I mixer, Q mixer and the RF Output amplifier. MIXOUT: Combined output of the I mixer and Q mixer. By changing the inductor value, maximum RF output is tuned to different frequency. If the inductor value is changed, the RF output match needs to be adjusted for 50 output impedance. Ground connection for the LO and baseband amplifiers and mixers. Same as pin 5. The input of the phase shifting network. LO Interface Schematic Q SIG Q REF BIAS BIAS 2 Q REF Q SIG Q REF 5 BIAS BIAS 3 4 VCC1 MIX OUT MIX OUT 5 6 7 8 9 GND1 GND1 LO IN GND3 RF OUT Ground connection for the LO phase shift network. RF Output. An external LC matching network is needed for a 50 match. RF OUT BIAS 10 11 12 GND2 GND1 PD Ground connection for the RF output stage. Same as pin 5. Power Down control. When this pin is "low", all circuits are shut off. PD 13 14 15 16 VCC2 GND1 Q SIG I SIG Power supply for all circuits except mixers and output amplifier. Same as pin 5. Baseband input to the Q mixer. Maximum output power is obtained when the input signal has a peak to peak amplitude of 400mV. The DC level for this pin is 1.6V, same as QREF. Baseband input to the Q mixer. Maximum output power is obtained when the input signal has a peak to peak amplitude of 400mV. The DC level for this pin is 1.6V, same as QREF. See pin 2. See pin 1. Rev A6 010817 5-45 MODULATORS AND UPCONVERTERS RF2424 Application Schematic VREF C R R R R C 1 2 3 1 nF L 4 1 nF 5 6 LO IN 7 8 -45 +45 16 POWER CONTROL C 15 14 13 Vcc I SIG Q SIG Vcc 1 nF 5 MODULATORS AND UPCONVERTERS 12 11 10 9 1 nF PD RF OUT 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). 5-46 Rev A6 010817 RF2424 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) Drawing 2424400 Rev C10 100 pF 1 C8 33 nF VCC P1-1 C1 1 nF C3 1 nF L3 8.2 nH 2 3 4 5 6 7 8 -45 +45 R3 100 50 strip I SIG J1 VREF P2-1 16 POWER CONTROL 50 strip 15 14 13 C9 100 pF R2 100 Q SIG J2 VCC P1-1 C7 1 nF PD P2-3 C6 1 nF C4 4 pF L2 6.8 nH 12 11 10 9 5 MODULATORS AND UPCONVERTERS LO IN J3 50 strip L1 10 nH 50 strip RF OUT J4 VCC P1-1 P1 P1-1 1 2 3 VCC GND GND P2-3 P2-1 P2 1 2 3 VREF GND PD C5 1 nF Rev A6 010817 5-47 RF2424 Evaluation Board Layout 2" x 2" 5 MODULATORS AND UPCONVERTERS 5-48 Rev A6 010817 |
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