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The LTC5589 from Linear Technology is a low power direct quadrature modulator designed for low power wireless applications from 700 MHz to 6 GHz that enables direct modulation of differential baseband I and Q signals on an RF carrier. Single side-band modulation or side-band suppressed upconversion can be achieved by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband input ports can be either AC or DC coupled to a source with a common mode voltage level of about 1.4V. The SPI interface controls the supply current, modulator gain, and allows adjustments of I and Q gain and phase imbalance to optimize the LO carrier feedthrough and side-band suppression. The LO port can be driven with sine wave or square wave LO drive.

An on-chip thermometer can be activated to compensate for gain-temperature variations. More accurate temperature measurements can be made using an on-chip diode. In addition, a continuous analog gain control (VCTRL) pin can be used for fast power control. It requires a single 2.7 V to 3.6 V supply and draws only 29.5 mA current. It has -50 dBc sideband suppression and -43 dBm carrier leakage without calibration. With on-chip calibration resources, performance can be further improved to –60dBc (Sideband Suppression) and –65dBm (Carrier Leakage). Moreover the device has an excellent noise floor of –157 dBm/Hz at 30 MHz with an OIP3 of 19 dBm. It is available in a 24-Lead 4 × 4 mm Plastic QFN Package and is ideal for military radios, software defined radios and wireless microphones.

Product Specifications

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Product Details

  • Part Number
  • Manufacturer
    Analog Devices
  • Description
    700MHz to 6GHz Low Power Direct Quadrature Modulator

General Parameters

  • Modulation Type
    I/Q Vector
  • RF Frequency
    700 MHz to 6 GHz
  • RF Frequency
    700 MHz to 6 GHz
  • LO Frequency
    700 MHz to 6 GHz
  • Integration
    Power Amplifier, VCO
  • P1dB
    -7.1 to 4.6 dBm(Output)
  • IP3
    19 dBm
  • IP2
    28.3 to 70.6 dBm
  • Voltage
    2.7 to 3.6 V
  • Noise Floor
    -159.6 dBm/Hz
  • Sideband Suppression
    41.5 dBc
  • Return Loss
    14.8 to 25 dB (O/P)
  • Current
    29.5 mA
  • Dimension
    4mm × 4mm
  • Package Type
    Surface Mount
  • Impedance
    50 Ohms
  • Operating_Temperature
    -40 to 105 Degree C
  • Storage_Temperature
    -65 to 150 Degree C
  • Application Industry
    Cellular, Military, Broadcast
  • Application Standards
  • Modulation/IF Power
    20 dBm
  • RF Output Power
    -17 to -5.7 dBm

Technical Documents

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