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Analog Devices Inc. LTC5589 Low Power Direct Quadrature Modulators

Analog Devices Inc. LTC5589 700MHz to 6GHz Low Power Direct Quadrature Modulators are developed for low-power wireless applications. Applying 90° phase-shifted signals to the I and Q inputs will accomplish single-sideband modulation or side-band suppressed upconversion.

The modulators can activate the on-chip thermometer to compensate for gain-temperature variations. Using an on-chip diode more accurate temperature measurements can be made. The Analog Devices Inc. LTC5589 offers a continuous analog gain control (VCTRL) pin for fast power control.

Features

  • –50dBc at 1.8GHz sideband suppression
  • 19dBm at 1.8GHz output IP3 rating
  • 24-lead 4mm × 4mm plastic QFN package
  • Low RF Output Noise Floor
    • –157dBm/Hz at 30MHz offset
    • PRF = 1.8dBm
    • fRF = 2.17GHz
  • Sine wave or square wave LO drive
  • 700MHz to 6GHz frequency range
  • 2.7V to 3.6V power range
  • 29.5mA power supply
  • –43dBm at 1.8GHz low LO carrier leakage
  • SPI Control
    • 19dB in 1dB steps adjustable gain
    • Effecting supply current from 9mA to 39mA
    • I/Q offset adjust: –64dBm LO carrier leakage
    • I/Q gain/phase adjust: –61dBc sideband suppressed

Applications

  • Wireless microphones
  • Battery-powered radios
  • Vector modulators
  • 2.45GHz and 5.8GHz transmitters
  • Software-Defined Radios (SDR)
  • Military radios

LTC5589 Typical Application

Block Diagram - Analog Devices Inc. LTC5589 Low Power Direct Quadrature Modulators
Inilathala: 2017-04-27 | Na-update: 2022-03-11