Datasheet HMC980 (Analog Devices) - 3

HMC980
v00.0312
Active BiAs controller High current typical Applications Features
• automatic Gate voltage adjustment (no Calibra- • Microwave radio & Vsat tion required) ip • Military & space • supply Voltage (5V to 16.5V) h • test instrumentation • Bias both enhancement or Depletion type • Fiber optic Modulator Driver Biasing devices • adjustable Drain Current up to 1.6 a s - C • CatV laser Driver Biasing • sink or source gate current r • Cel ular Base station • Wireless infrastructure equipment • internal negative voltage generation • Can be disabled to use external negative rail lle • Fast enable/Disable o • trigger-out output for Daisy Chain r t • power-Up and power-Down sequencing n • over/Under Current alarm with built-in hystresis o • Die size: 1.4 x 2.26 x 0.25mm s C ia B
Functional Diagram General Description
hMC980 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, hMC980 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. hMC980 achieves excel ent bias stability over supply, temperature and process variations, and eliminates the required calibration procedures usual y employed to prevent rF performance degradation due to such variations. all data shown herein is taken with appropriate probes. For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com
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Application Support: Phone: 978-250-3343 or apps@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 Pad Descriptions 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 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