Datasheet HMC980LP4E (Analog Devices) - 3

HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER HIGH CURRENT Typical Applications Features
• Automatic Gate voltage adjustment (No Calibra- T • Microwave Radio & VSAT tion required) M • Military & Space • Supply Voltage (5V to 16.5V) • Test Instrumentation • Bias both Enhancement or Depletion type • Fiber Optic Modulator Driver Biasing devices S - S • CATV Laser Driver Biasing • Adjustable Drain Current up to 1.6 A R • Cel ular Base Station • Sink or source gate current • Wireless Infrastructure Equipment • Internal negative voltage generation • Can be disabled to use external negative rail LLE O • Fast Enable/Disable R • Trigger-out Output for Daisy Chain T • Power-Up and Power-Down Sequencing N • Over/Under Current Alarm with built-in hystresis O • 24 Lead 4mmx4mm QFN Package: 16mm2 S C IA B
Functional Diagram General Description
HMC980LP4E is an active bias control er that can automatical y adjust the gate voltage of an external amplifier to achieve constant bias current. With an integrated control er, HMC980LP4E achieves safe power on/off, disable/enable and automatic supply sequencing ensuring the safety of the external amplifier. It can be used to bias any enhancement and depletion type amplifier operating in Class-A regime with drain voltages (VDRAIN) from 5V to 16.5V and drain currents (IDRAIN) up to 1.6 A, offering a complete biasing solution. HMC980LP4E achieves excel ent 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 HMC980LP4E is housed in an RoHS compliant 4x4 mm QFN leadless package with an exposed backside pad to improve thermal characteristics. For price, delivery, and to place orders, please contact Hittite Microwave Corporation: 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
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Order On-line at www.hittite.com Document Outline Typical Applications Features Functional Diagram General Description Electrical Specifications Typical Performance Characteristics Bias Current Accuracy[1] Bias Current Accuracy[2] Power Up Waveform Shutdown Waveform Enable Waveform Disable Waveform Load Regulation @ VDD=5V, VDIG=3.3V, SW0=GND, SW1=GND Load Regulation @ VDD=5V, VDIG=3.3V, SW0=3.3V, SW1=GND Load Regulation @ VDD=16.5V, VDIG=5.0V, SW0=GND, SW1=VDIG Load Regulation @ VDD=16.5V, VDIG=5.0V, SW0=VDIG, SW1=VDIG VNEG Load Regulation @ VDD=5V VNEG Load Regulation @ VDD=16.5V VNEG Load Transient VDD=5V VNEG Load Transient VDD=16.5V VGATE Load Regulation @ VDD=12V [1] VG2 Load Regulation @ VDD=12V [2] VNEG Line Regulation vs. Supply Voltage Absolute Maximum Ratings Outline Drawing Package Information Pin Descriptions Evaluation Board Circuit Evaluation PCB List of Materials for Evaluation PCB Application Notes Detailed Description Digital Power Supply (VDIG) Supply and Drain Voltage (VDD and VDRAIN) Table 1. REcommended Current Range Configuration Negative Voltage Generator (VNEGOUT) Enable/Disable (EN) Active Bias Control Loop VG2 Voltage Adjustment Self Protection Feature VNEG Fault Detection Feature Over/Under Current Alarm Power-up and Enable Sequencing Daisy-Chain Operation Operation Modes Table 2 - The List of Bias Settings for Various Hittite Amplifiers Table 3 - List of Bias Settings for Various Hittite Amplifiers