1. Products
  2. RF and Microwave
  3. I/Q Modulators and Demodulators
  4. I/Q Modulators
  5. LTC5598


Features and Benefits

  • Frequency Range: 5MHz to 1600MHz
  • High Output IP3:
    • +27.7dBm at 140MHz
    • +22.9dBm at 900MHz
  • Low Output Noise Floor at 6MHz Offset:
    • No Baseband AC Input: –161.2dBm/Hz
    • POUT = 5.5dBm: –160dBm/Hz
  • Low LO Feedthrough: –55dBm at 140MHz
  • High Image Rejection: –50.4dBc at 140MHz
  • Integrated LO Buffer and LO Quadrature Phase Generator
  • 50Ω Single-Ended LO and RF Ports
  • >400MHz Baseband Bandwidth
  • 24-Lead QFN 4mm × 4mm Package
  • Pin-Compatible with Industry Standard Pin-Out
  • Shut-down Mode

Product Details

The LTC5598 is a direct I/Q modulator designed for high performance wireless applications, including wireless infrastructure. It allows direct modulation of an RF signal using differential baseband I and Q signals. It supports point-to-point microwave link, GSM, EDGE, CDMA, 700MHz band LTE, CDMA2000, CATV applications and other systems. It may also be configured as an image reject upconverting mixer, by applying 90° phase-shifted signals to the I and Q inputs.

The I/Q baseband inputs consist of voltage-to-current converters that in turn drive double-balanced mixers. The outputs of these mixers are summed and applied to a buffer, which converts the differential mixer signals to a 50Ω single-ended buffered RF output. The four balanced I and Q baseband input ports are intended for DC coupling from a source with a common-mode voltage level of about 0.5V. The LO path consists of an LO buffer with single-ended or differential inputs, and precision quadrature generators that produce the LO drive for the mixers. The supply voltage range is 4.5V to 5.25V, with about 168mA current.


  • Point-to-Point Microwave Link
  • Military Radio
  • Basestation Transmitter GSM/EDGE/CDMA2K
  • 700MHz LTE Basestation Transmitter
  • Satellite Communication
  • CATV/Cable Broadband Modulators
  • 13.56MHz/UHF RFID Modulator

Product Categories

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

Design Tools


ADIsimRF is an easy-to-use RF signal chain calculator. Cascaded gain, noise, distortion and power consumption can be calculated, plotted and exported for signal chains with up to 50 stages. ADIsimRF also includes an extensive data base of device models for ADI’s RF and mixed signal components.

Product Recommendations

LTC5598 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC5598IUF#PBF Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
LTC5598IUF#TRPBF Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Wafer Fabrication Data R543 Reliability Data

Sample & Buy

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Lead Times

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.