HMC981 v00.0611 ACTIVE BIAS CONTROLLER Typical Applications Features Automatic Gate voltage adjustment (No Calibration Microwave Radio & VSAT required) Military & Space Supply Voltage: 4V to 12V Test Instrumentation Digital Voltage: 3.3V to 5V Fiber Optic Modulator Driver Biasing Controls both Enhancement and Depletion type devices CATV Laser Driver Biasing Adjustable Drain Current up to 200mA Cellular Base Station Sink/Source Gate Current Capability Wireless Infrastructure Equipment 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 Functional Diagram General Description HMC981 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. HMC981 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. All data shown herein is taken with appropriate probes. Information furnished by Analog Devices is believed to be accurate and reliable. However, no For price, delivery, and to place orders: Analog Devices, Inc., For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824 responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 rights of third parties that may result from its use. Specifications subject to change without notice. No Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Phone: 781-329-4700 Order online at www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 1 Trademarks and registered trademarks are the property of their respective owners. Application Support: Phone: 1-800-ANALOG-D Application Support: Phone: 978-250-3343 or apps hittite.com BIAS CONTROLLERS - CHIPHMC981 v00.0611 ACTIVE BIAS CONTROLLER Electrical Specifications, T = +25C, VDD=8V, VDIG= 3.3V, Depletion Master A Unless Otherwise Noted Parameter Symbol Conditions Min. Typ. Max. Units Supply Voltage Vdd 4 12 V EN = VDIG 7 mA VDD = 4V EN = GND 3 mA VDD Quiescent Current IDD EN = VDIG 7.5 mA VDD = 8V EN = GND 4 mA VDIG= 3.3 V 3 mA VDIG Quiescent Current IDIG VDIG= 5 V 5 mA Negative Voltage Output VNEG -2.5 V Oscillator Frequency FOSC 300 kHz Voltage Reference VREF 1.42 V Vinlow 1 V Enable Input Threshold ENTHRS Vinhigh 1.4 V Vinlow 1 V Switch Input Threshold SWTHRS Vinhigh 1.4 V Vinlow 1 V Short Circuit Disable Input Threshold DSCTHRS Vinhigh 1.4 V VDRAIN Characteristics SW=GND 20 80 mA DRAIN Current Adjustment Range IDRAIN SW=VDIG 80 200 mA DRAIN Current Change Over Digital Voltage 0.4 %/V VDRAIN set to 8V, IDRAINV IDRAIN set to 160 mA DRAIN Current Change Over Temperature 0.02 %/C DRAIN Range VDRAIN 4 12 V VDRAIN set to 8V, VDRAIN Change Over Temperature VDRAIN 1.5 %/C IDRAIN set to 160 mA VNEG Characteristics Negative Voltage Output VNEG -2.5 V VDD= 4V 0 8 mA VNEG Current Sink INEG VDD= 8V 0 15 mA VGATE Characteristics GATE Current Supply IG -0.8 0.8 mA VGATE Low Level VG MIN VNEG V VGATE High Level VG MAX VNEG+4.5 V VG2 Characteristics VG2<1.5V -0.1 0.1 mA VG2 Current Supply IG2 VG2>1.5V -1 1 mA VG2 Adjustment Range VG2 1 VDD-1.3 V VDIG Characteristics Adjustment Range VDIG 3.3 5 V VDD= 8 V, VDIG Quiescent Current IDIG 3 mA VDIG=EN =3.3 V SW Characteristics SW= GND 10 Ohm Internal Switch Resistance RDS ON SW=VDIG 5 Ohm Information furnished by Analog Devices is believed to be accurate and reliable. However, no For price, delivery, and to place orders: Analog Devices, Inc., For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824 responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106 rights of third parties that may result from its use. Specifications subject to change without notice. No Phone: 978-250-3343 Fax: 978-250-3373 Order On-line at www.hittite.com Phone: 781-329-4700 Order online at www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 2 Trademarks and registered trademarks are the property of their respective owners. Application Support: Phone: 1-800-ANALOG-D Application Support: Phone: 978-250-3343 or apps hittite.com BIAS CONTROLLERS - CHIP