ADL5382:  700 MHz to 2700MHz Quadrature Demodulator

The ADL5382 is a broadband quadrature I-Q demodulator that covers an RF input frequency range from 700 MHz to 2.7 GHz. With a NF = 14 dB, IP1dB = 14.7 dBm, and IIP3 = 33.5 dBm at 900 MHz, the ...More

ADL5382:  700 MHz to 2700MHz Quadrature Demodulator

Product Description

The ADL5382 is a broadband quadrature I-Q demodulator that covers an RF input frequency range from 700 MHz to 2.7 GHz. With a NF = 14 dB, IP1dB = 14.7 dBm, and IIP3 = 33.5 dBm at 900 MHz, the ADL5382 demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF inputs provide a well-behaved broadband input impedance of 50 Ω and are best driven from a 1:1 balun for optimum performance.

Excellent demodulation accuracy is achieved with amplitude and phase balances ~0.05 dB and ~0.2°, respectively. The demodulated in-phase (I) and quadrature (Q) differential outputs are fully buffered and provide a voltage conversion gain of ~4 dB. The buffered baseband outputs are capable of driving a 2 V p-p differential signal into 200 Ω.

The fully balanced design minimizes effects from second-order distortion. The leakage from the LO port to the RF port is <−65 dBc. Differential dc offsets at the I and Q outputs are typically <10 mV. Both of these factors contribute to the excellent IIP2 specifications which is >60 dBm.

The ADL5382 operates off a single 4.75 V to 5.25 V supply. The supply current is adjustable with an external resistor from the BIAS pin to ground. The ADL5382 is fabricated using the Analog Devices, Inc., advanced Silicon-Germanium bipolar process and is available in a 24-lead exposed paddle LFCSP. Performance is specified over a -40°C to +85°C temperature range.

Applications

  • QAM/QPSK demodulator
  • W-CDMA/CDMA/CDMA2000/GSM
  • Point-to-(Multi)Point Radio
  • WiMax

    • Data Sheet, Rev. 0, 3/08

    Features

    • I/Q Demodulator
    • Operating RF frequency
      700 MHz to 2700MHz
    • IIP3 +30 dBm
    • IIP2 +60dBm
    • Input P1dB +13dBm
    • NF 14 dB @ 900MHz
    • Voltage Conversion Gain of 5dB
    • Quadrature demodulation accuracy
      Phase accuracy <0.5°
      Amplitude balance <0.25 dB
    • LO Input –10 to +5 dBm
    • Demodulation Bandwidth ~500 MHz
    • I/Q Drive 2Vpk into 200Ω
    • Programmable Power Consumption

    Diagrams

    ADL5382 Diagram
    Functional Block Diagram for ADL5382

    Specifications

    Function Demod
    RF Freq (MHz) 700 to 2700
    IQ Freq (MHz) 370MHz
    Phase Error (deg) 0.2Deg
    Amplitude Error (dB) 0.05dB
    Voltage Supply (V) 4.75 to 5.25
    Supply Current (max) 220mA
    Package 24-Lead LFCSP

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    AD8346 Mod 800 to 2500 70 1 0.2 - -147 2.7 to 5.5 45 16-Lead Tssop $4.45
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    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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