LTC5589 - 700MHz to 6GHz Low Power Direct Quadrature Modulator


  • Frequency Range: 700MHz to 6GHz
  • Low Power: 2.7V to 3.6V Supply; 29.5mA
  • Low LO Carrier Leakage: –43dBm at 1.8GHz
  • Side-Band Suppression: –50dBc at 1.8GHz
  • Output IP3: 19dBm at 1.8GHz
  • Low RF Output Noise Floor: –157dBm/Hz at 30MHz Offset, PRF = 1.8dBm, fRF = 2.17GHz
  • Sine Wave or Square Wave LO Drive
  • SPI Control:
    Adjustable Gain: 19dB in 1dB Steps
    Effecting Supply Current from 9mA to 39mA
    I/Q Offset Adjust: –64dBm LO Carrier Leakage
    I/Q Gain/Phase Adjust: –61dBc Side-Band Suppressed
  • 24-Lead 4mm × 4mm Plastic QFN Package

Typical Application

LTC5589 Typical Application
LTC5589 Typical Application


The LTC®5589 is a direct conversion I/Q modulator designed for low power wireless applications 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. A fixed LC network on the LO and RF ports covers 700MHz to 6GHz operating range. 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.


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC5589IUF#PBF 4x4 QFN-24 UF I 05-08-1697 Yes
LTC5589IUF#TRPBF 4x4 QFN-24 UF I 05-08-1697 Yes

LTC5589 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC5589IUF#PBF 4x4 QFN-24 I $6.36 $4.45 Yes
LTC5589IUF#TRPBF 4x4 QFN-24 I $6.42 $4.50 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2391A LTC5589 Demoboard | 700MHz - 3.8GHz Low-Power I/Q Modulator $125.00
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