ADL5387:  50 MHz to 2 GHz Quadrature Demodulator

The ADL5387 is a broadband quadrature I/Q demodulator that covers an RF/IF input frequency range from 50 MHz to 2 GHz. With a NF = 13.2 dB, IP1dB = 12.7 dBm, and IIP3 = 32 dBm @ 450 MHz, the ...More

ADL5387:  50 MHz to 2 GHz Quadrature Demodulator

Product Description

The ADL5387 is a broadband quadrature I/Q demodulator that covers an RF/IF input frequency range from 50 MHz to 2 GHz. With a NF = 13.2 dB, IP1dB = 12.7 dBm, and IIP3 = 32 dBm @ 450 MHz, the ADL5387 demodulator offers outstanding dynamic range suitable for the demanding infrastructure direct-conversion requirements. The differential RF/IF inputs provide a well-behaved broadband input impedance of 50 Ω and are best driven from a 1:1 balun for optimum performance.

Ultrabroadband operation is achieved with a divide-by-2 method for local oscillator (LO) quadrature generation. Over a wide range of LO levels, excellent demodulation accuracy is achieved with amplitude and phase balances ~0.05 dB and ~0.4°, 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 <−70 dBc. Differential dc-offsets at the I and Q outputs are <10 mV. Both of these factors contribute to the excellent IIP2 specifications > 60 dBm.

The ADL5387 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 ADL5387 is fabricated using the Analog Devices, Inc. advanced silicon-germanium bipolar process and is available in a 24-lead exposed paddle LFCSP.

Applications

  • QAM/QPSK RF/IF demodulators
  • W-CDMA/CDMA/CDMA2000/GSM
  • Microwave point-to-(multi)point radios
  • Broadband wireless and WiMAX
  • Broadband CATVs

    • Data Sheet, Rev. 0, 10/07

    Features

    • Operating RF frequency
      50 MHz to 2 GHz
    • LO input at 2 × fLO
      100 MHz to 4 GHz
    • Input IP3: 31 dBm @ 900 MHz
    • Input IP2: 62 dBm @ 900 MHz
    • Input P1dB: 13 dBm @ 900 MHz
    • Noise figure (NF)
      12.0 dB @ 140 MHz
      14.7 dB @ 900 MHz
    • Voltage conversion gain > 4 dB
    • Quadrature demodulation accuracy
      Phase accuracy ~0.4°
      Amplitude balance ~0.05 dB
    • Demodulation bandwidth ~240 MHz
    • Baseband I/Q drive 2 V p-p into 200 Ω
    • Single 5 V supply

    Diagrams

    ADL5387 Diagram
    Functional Block Diagram for ADL5387

    Specifications

    Function Demod
    RF Freq (MHz) 50 to 2000
    IQ Freq (MHz) 240MHz
    Phase Error (deg) 0.4Deg
    Amplitude Error (dB) 0.1dB
    Voltage Supply (V) 4.75 to 5.25
    Supply Current (max) 180mA
    Package 24-Lead LFCSP

    Explore Other Products

    Part# Function RF Freq (MHz) IQ Freq (MHz) Phase Error (deg) Amplitude Error (dB) VGA Range (dB) Noise Floor (dBm/Hz) Voltage Supply (V) Supply Current (max) Package Price* (1000-4999)
    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