HMC981LP3E Datasheet, PDF (1/17 Pages) Hittite Microwave Corporation – ACTIVE BIAS CONTROLLER

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Typical Applications
• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
• Fiber Optic Modulator Driver Biasing
• CATV Laser Driver Biasing
• Cellular Base Station
• Wireless Infrastructure Equipment
Functional Diagram
HMC981LP3E
ACTIVE BIAS CONTROLLER
Features
Automatic Gate voltage adjustment (No Calibration
required)
Supply Voltage: 4V to 12V
Digital Voltage: 3.3V to 5V
Controls both Enhancement and Depletion type
devices
Adjustable Drain Current up to 200mA
Sink/Source Gate Current Capability
Optional Internal negative voltage generation that
can be disabled to use external negative rail
Fast Enable/Disable
Trigger-out Output for Daisy Chain Power-Up and
Power-Down Sequencing
16 Lead 3x3 mm SMT Package: 9 mm²
General Description
HMC981LP3E is an active bias controller that
automatically adjusts the gate voltage of an external
amplifier to achieve constant bias current. It can be
used to bias any enhancement and depletion type
amplifiers operating in Class-A regime with Drain
voltages from 4V to 12V and drain currents up to
200mA, offering a complete biasing solution.
HMC981LP3E achieves excellent bias stability over
supply, temperature and process variations, and
eliminates the required calibration procedures usually
employed to prevent RF performance degradation due
to such variations.
The HMC981LP3E is housed in an RoHS compliant
3x3 mm QFN leadless package with an exposed
backside pad to improve thermal characteristics.
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For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
2 Elizabeth Drive, Chelmsford, MA 01824 Phone: [phone] Fax: [phone]
Order On-line at www.hittite.com