Datasheet AD8341 (Analog Devices)

1.5 GHz to 2.4 GHz RF Vector Modulator Data Sheet AD8341 FEATURES FUNCTIONAL BLOCK DIAGRAM Cartesian amplitude and phase modulation VPRF QBBP QBBM VPS2 1.5 GHz to 2.4 GHz frequency range Continuous magnitude control of −4.5 dB to −34.5 dB 90 Continuous phase control of 0° to 360° RFIP RFOP Output third-order intercept 17.5 dBm RFIM RFOM Output 1 dB compression point 8.5 dBm 0 Output noise floor −150.5 dBm/Hz at full gain Adjustable modulation bandwidth up to 230 MHz CMOP IBBP IBBM DSOP
04700-001
Fast output power disable
Figure 1.
4.75 V to 5.25 V single-supply voltage APPLICATIONS RF PA linearization/RF predistortion Amplitude and phase modulation Variable attenuators and phase shifters CDMA2000, WCDMA, GSM/EDGE linear power amplifiers Smart antennas GENERAL DESCRIPTION
The AD8341 vector modulator performs arbitrary amplitude bandwidth is 230 MHz, which can be reduced by adding external and phase modulation of an RF signal. Because the RF signal capacitors to limit the noise bandwidth on the control lines. path is linear, the original modulation is preserved. This part can Both the RF inputs and outputs can be used differentially or be used as a general-purpose RF modulator, a variable attenuator/ single-ended and must be ac-coupled. The RF input and output phase shifter, or a remodulator. The amplitude can be controlled impedances are nominally 50 Ω over the operating frequency from a maximum of −4.5 dB to less than −34.5 dB, and the phase range. The DSOP pin allows the output stage to be disabled can be shifted continuously over the entire 360° range. For max- quickly in order to protect subsequent stages from overdrive. imum gain, the AD8341 delivers an OP1dB of 8.5 dBm, an OIP3 The AD8341 operates off supply voltages from 4.75 V to 5.25 V of 17.5 dBm, and an output noise floor of −150.5 dBm/Hz, while consuming approximately 125 mA. independent of phase. It operates over a frequency range of 1.5 GHz to 2.4 GHz. The AD8341 is fabricated on Analog Devices’ proprietary, high performance 25 GHz SOI complementary bipolar IC process. It The baseband inputs in Cartesian I and Q format control the is available in a 24-lead, lead-free LFCSP package and operates amplitude and phase modulation imposed on the RF input over a −40°C to +85°C temperature range. Evaluation boards signal. Both I and Q inputs are dc-coupled with a ±500 mV are available. differential full-scale range. The maximum modulation
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION RF QUADRATURE GENERATOR I-Q ATTENUATORS AND BASEBAND AMPLIFIERS OUTPUT AMPLIFIER NOISE AND DISTORTION GAIN AND PHASE ACCURACY RF FREQUENCY RANGE APPLICATIONS INFORMATION USING THE AD8341 RF INPUT AND MATCHING RF OUTPUT AND MATCHING DRIVING THE I-Q BASEBAND CONTROLS INTERFACING TO HIGH SPEED DACs CDMA2000 APPLICATION WCDMA APPLICATION EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE