AD8340:  700 MHz to 1000 MHz RF Vector Modulator

The AD8340 vector modulator performs arbitrary amplitude and phase modulation of an RF signal. Because the RF signal path is linear, the original modulation is preserved. This part can be used as ...More

AD8340:  700 MHz to 1000 MHz RF Vector Modulator

Product Description

The AD8340 vector modulator performs arbitrary amplitude and phase modulation of an RF signal. Because the RF signal path is linear, the original modulation is preserved. This part can be used as a general-purpose RF modulator, a variable attenuator/phase shifter, or a remodulator. The amplitude can be controlled from a maximum of −2 dB to less than −32 dB, and the phase can be shifted continuously over the entire 360° range. For maximum gain, the AD8340 delivers an OP1dB of 11 dBm, an OIP3 of 24 dBm, and an output noise floor of −149 dBm/Hz, independent of phase. It operates over a frequency range of 700 MHz to 1.0 GHz.

The baseband inputs in Cartesian I and Q format control the 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.

Both the RF inputs and outputs can be used differentially or single-ended and must be ac-coupled. The RF input and output impedances are nominally 50 Ω over the operating frequency range. The DSOP pin allows the output stage to be disabled quickly to protect subsequent stages from overdrive. The AD8340 operates off supply voltages from 4.75 V to 5.25 V while consuming approximately 130 mA.

The AD8340 is fabricated using the Analog Devices, Inc. proprietary, high performance 25 GHz SOI complementary bipolar IC process. It is available in a 24-lead RoHS-compliant LFCSP package and operates over a −40°C to +85°C temperature range. Evaluation boards are available.

Applications

  • RF PA linearization/RF predistortion
  • Amplitude and phase modulation
  • Variable attenuators and phase shifters
  • CDMA2000, GSM/EDGE linear power amplifiers
  • Smart antennas

    • Data Sheet, Rev. B, 8/07

    Features

    • Cartesian amplitude and phase modulation
    • 700 MHz to 1.0 GHz frequency range
    • Continuous magnitude control of −2 dB to
      −32 dB
    • Continuous phase control of 0° to 360°
    • Output third-order intercept 24 dBm
    • Output 1 dB compression point 11 dBm
    • Output noise floor −149 dBm/Hz @ full gain
    • Adjustable modulation bandwidth up to
      230 MHz
    • Fast output power disable
    • 4.75 V to 5.25 V single-supply voltage

    Diagrams

    AD8340 Diagram
    Functional Block Diagram for AD8340

    Specifications

    Function Vector Mod
    RF Freq (MHz) 700 to 1000
    Voltage Supply (V) 5
    Supply Current (max) 130mA
    Package 24-Lead LFCSP

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    AD630 Demod, Mod dc to 2 - - - - - +/- 15 5 20-Lead DIP $6.25
    AD8333 Demod dc to 50 - 0.1 0.05 - -161 +/- 5 44 32-Lead LFCSP $9.06
    AD8339 Demod dc to 50 50 1 0.25 - - 4.5 to 5.5 35 40-Lead LFCSP $12.09
    AD8340 Vector Mod 700 to 1000 - - - - - 5 130 24-Lead LFCSP $7.59
    AD8341 Vector Mod 1500 to 2400 - - - - -150.5 4.75 to 5.25 125 24-Lead LFCSP $7.59
    AD8345 Mod 140 to 1000 80 0.5 0.2 - -155 2.7 to 5.5 65 16-Lead Tssop $5.02
    AD8346 Mod 800 to 2500 70 1 0.2 - -147 2.7 to 5.5 45 16-Lead Tssop $4.45
    AD8347 Demod 800 to 2700 65 1 0.3 69.5 - 2.7 to 5.5 64 28-Lead TSSOP $5.85
    AD8348 Demod 50 to 1000 75 0.5 0.25 45 - 2.7 to 5.5 58 28-Lead TSSOP $5.01
    AD8349 Mod 700 to 2700 160 0.3 0.1 - -156 5 135 16-Lead Tssop $5.02
    ADL5370 Mod 250 to 1300 700 - - - -156 4.75 to 5.5 210 24-Lead LFCSP $5.04
    ADL5371 Mod 700 to 1300 700 - - - -156 4.75 to 5.5 175 24-Lead LFCSP $5.04
    ADL5372 Mod 1500 to 2500 700 - - - -158 4.75 to 5.5 175 24-Lead LFCSP $5.04
    ADL5373 Mod 2300 to 3000 700 - - - -156 4.75 to 5.5 175 24-Lead LFCSP $5.04
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