Datasheet AD8340 (Analog Devices)

700 MHz to 1000 MHz RF Vector Modulator Data Sheet AD8340 FEATURES FUNCTIONAL BLOCK DIAGRAM Cartesian amplitude and phase modulation VPRF QBBP QBBM VPS2 700 MHz to 1.0 GHz frequency range Continuous magnitude control of −2 dB to −32 dB 90° Continuous phase control of 0° to 360° RFIP RFOP Output third-order intercept 24 dBm RFIM RFOM Output 1 dB compression point 11 dBm 0° Output noise floor −149 dBm/Hz at full gain
001
Adjustable modulation bandwidth up to 230 MHz CMOP IBBP IBBM DSOP
04699-
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, GSM/EDGE linear power amplifiers Smart antennas GENERAL DESCRIPTION
The AD8340 vector modulator performs arbitrary amplitude Both the RF inputs and outputs can be used differentially or and phase modulation of an RF signal. Because the RF signal single-ended and must be ac-coupled. The RF input and output path is linear, the original modulation is preserved. This part impedances are nominally 50 Ω over the operating frequency can be used as a general-purpose RF modulator, a variable range. The DSOP pin allows the output stage to be disabled attenuator/phase shifter, or a remodulator. The amplitude can quickly to protect subsequent stages from overdrive. The be controlled from a maximum of −2 dB to less than −32 dB, AD8340 operates off supply voltages from 4.75 V to 5.25 V and the phase can be shifted continuously over the entire 360° while consuming approximately 130 mA. range. For maximum gain, the AD8340 delivers an OP1dB The AD8340 is fabricated using the Analog Devices, Inc. of 11 dBm, an OIP3 of 24 dBm, and an output noise floor of proprietary, high performance 25 GHz SOI complementary −149 dBm/Hz, independent of phase. It operates over a fre- bipolar IC process. It is available in a 24-lead RoHS-compliant quency range of 700 MHz to 1.0 GHz. LFCSP package and operates over a −40°C to +85°C tempera- The baseband inputs in Cartesian I and Q format control the ture range. Evaluation boards are available. amplitude and phase modulation imposed on the RF input signal. Both I and Q inputs are dc-coupled with a ±500 mV differential full-scale range. The maximum modulation band- width is 230 MHz, which can be reduced by adding external capacitors to limit the noise bandwidth on the control lines.
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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 AD8340 RF Input and Matching RF Output and Matching Driving the I-Q Baseband Controls Interfacing to High Speed DACs CDMA2000 Application Evaluation Board Schematic and Artwork Outline Dimensions Ordering Guide