RF2424 5 UHF QUADRATURE MODULATOR Typical Applications • Digital Communications Systems • GSM and D-AMPS Systems • Spread Spectrum Communication Systems • AM, SSB, DSB Modulation • Image-Reject Upconverters Product Description -A- 0.157 0.150 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 50Ω from 700MHz to 1000MHz. 0.0098 0.0040 0.012 0.008 5 0.196 0.189 MODULATORS AND UPCONVERTERS • GMSK,QPSK,DQPSK,QAM Modulation 0.025 0.0688 0.0532 0.2440 0.2284 8° MAX 0°MIN 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® Applied ü Si BJT GaAs HBT GaAs MESFET Si Bi-CMOS SiGe HBT Si CMOS Package Style: SSOP-16 Features • Single 2.7V to 5.5V Power Supply 16 ISIG • +7.5dBm Output Power 15 QSIG • No Tuning Required VCC1 3 14 GND1 • Low LO Input Level MIXOUT 4 13 VCC2 I REF 1 POWER CONTROL Q REF 2 Σ GND1 5 GND3 8 -45° +45° 10 GND2 9 RFOUT Functional Block Diagram Rev A6 010817 • 700MHz to 1000MHz Operation 11 GND1 GND1 6 LO 7 12 PD • Digitally Controlled Power Down Mode Ordering Information RF2424 RF2424 PCBA UHF Quadrature Modulator Fully Assembled Evaluation Board RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 5-43 RF2424 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature Parameter Rating Unit 5.5 +6.0 -40 to +85 -40 to +150 VDC dBm °C °C Specification Min. Typ. Max. 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). Unit T=25 °C, VCC =3V Carrier Input MODULATORS AND UPCONVERTERS 5 Frequency Range Power Level Input impedance Condition 700 -6 1000 +6 43 + j1.8 MHz dBm Ω At 900MHz Modulation Input Frequency Range Reference Voltage (VREF) Maximum Modulation (I&Q) Gain Asymmetry Quadrature Phase Error Input DC Resistance Input Bias Current DC 100 1.6 VREF ± 0.3 0.2 1 40 40 MHz V V dB ° kΩ µA VCC =3V, LO power=-3dBm, LO freq=900MHz, I/Q drive level=0.2VP, SSB RF Output Output Power Output Impedance Broadband Noise Floor Sideband Suppression Carrier Suppression IM3 Suppression +5.0 25 25 25 +7.5 50 -140 35 30 30 dBm Ω dBm/Hz dB dB dB DSB output (+9dBm total power) Power Down Turn On/Off Time PD Input Resistance Power Down “ON” Power Down “OFF” 100 ns kΩ V V 5.5 55 V mA mA µA 10 1.0 VCC 1.2 Power Supply Voltage Current Power Down 5-44 2.7 45 53 10 VCC =3V VCC =5V Rev A6 010817 RF2424 2 3 4 5 6 7 Function I REF Q REF VCC1 MIX OUT GND1 GND1 LO IN 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. Interface Schematic Q SIG Q REF BIAS BIAS Q SIG Q REF 5 BIAS 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 50Ω output impedance. BIAS MODULATORS AND UPCONVERTERS Pin 1 MIX OUT Ground connection for the LO and baseband amplifiers and mixers. Same as pin 5. The input of the phase shifting network. LO 8 9 GND3 RF OUT Ground connection for the LO phase shift network. RF Output. An external LC matching network is needed for a 50Ω 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 VCC2 GND1 Q SIG 16 I SIG Rev A6 010817 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. 5-45 RF2424 Application Schematic VREF C R R R R C 1 nF 5 15 3 14 4 13 Σ 5 Vcc 7 8 -45° +45° Q SIG 1 nF PD 12 11 6 LO IN C L 1 nF MODULATORS AND UPCONVERTERS POWER CONTROL 2 Vcc I SIG 16 1 1 nF 10 9 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.) R3 100 Ω Drawing 2424400 Rev - 50 Ω µstrip I SIG J1 C10 100 pF 1 C8 33 nF C1 1 nF 50 Ω µstrip LO IN J3 POWER CONTROL 2 VCC P1-1 C3 1 nF 16 L3 8.2 nH 3 14 4 13 Σ 5 6 L1 10 nH 50 Ω µstrip 15 12 C9 100 pF R2 100 Ω VCC P1-1 C7 1 nF -45° +45° 8 10 5 PD P2-3 11 7 Q SIG J2 C6 1 nF C4 4 pF 9 50 Ω µstrip MODULATORS AND UPCONVERTERS VREF P2-1 RF OUT J4 L2 6.8 nH P1 P1-1 Rev A6 010817 VCC P1-1 P2 1 VCC 2 GND 3 GND P2-1 P2-3 1 VREF 2 GND 3 PD C5 1 nF 5-47 RF2424 Evaluation Board Layout 2” x 2” MODULATORS AND UPCONVERTERS 5 5-48 Rev A6 010817