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Hittite Microwave Corporation

HMC981 Datasheet Preview

HMC981 Datasheet

ACTIVE BIAS CONTROLLER

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v00.0611
13
Typical Applications
• Microwave Radio & VSAT
• Military & Space
• Test Instrumentation
• Fiber Optic Modulator Driver Biasing
• CATV Laser Driver Biasing
• Cellular Base Station
• Wireless Infrastructure Equipment
HMC981
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
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.
13 - 1
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
Order On-line at www.hittite.com
Datasheet pdf - http://www.DataSheet4U.net/




Hittite Microwave Corporation

HMC981 Datasheet Preview

HMC981 Datasheet

ACTIVE BIAS CONTROLLER

No Preview Available !

www.DataSheet.co.kr
v00.0611
HMC981
ACTIVE BIAS CONTROLLER
Electrical Specifications,
Unless Otherwise Noted
TA
=
+25°C,
VDD=8V,
VDIG=
3.3V,
Depletion
Master
Supply Voltage
Parameter
VDD Quiescent Current
VDIG Quiescent Current
Negative Voltage Output
Oscillator Frequency
Voltage Reference
Enable Input Threshold
Switch Input Threshold
Short Circuit Disable Input Threshold
VDRAIN Characteristics
DRAIN Current Adjustment Range
DRAIN Current Change Over Digital Voltage
DRAIN Current Change Over Temperature
DRAIN Range
VDRAIN Change Over Temperature
VNEG Characteristics
Negative Voltage Output
VNEG Current Sink
VGATE Characteristics
GATE Current Supply
VGATE Low Level
VGATE High Level
VG2 Characteristics
VG2 Current Supply
VG2 Adjustment Range
VDIG Characteristics
Adjustment Range
VDIG Quiescent Current
SW Characteristics
Internal Switch Resistance
Symbol
Vdd
IDD
IDIG
VNEG
FOSC
VREF
ENTHRS
SWTHRS
DSCTHRS
Conditions
VDD = 4V
EN = VDIG
EN = GND
VDD = 8V
EN = VDIG
EN = GND
VDIG= 3.3 V
VDIG= 5 V
Vinlow
Vinhigh
Vinlow
Vinhigh
Vinlow
Vinhigh
IDRAIN
ΔIDRAINV
VDRAIN
ΔVDRAIN
SW=GND
SW=VDIG
VDRAIN set to 8V,
IDRAIN set to 160 mA
VDRAIN set to 8V,
IDRAIN set to 160 mA
VNEG
INEG
VDD= 4V
VDD= 8V
IG
VG_MIN
VG_MAX
IG2
VG2
VG2<1.5V
VG2>1.5V
VDIG
IDIG
VDD= 8 V,
VDIG=EN =3.3 V
RDS_ON
SW= GND
SW=VDIG
Min. Typ. Max.
4 12
7
3
7.5
4
3
5
-2.5
300
1.42
1
1.4
1
1.4
1
1.4
20 80
80 200
0.4
0.02
4 12
1.5
-2.5
08
0 15
-0.8
VNEG
VNEG+4.5
0.8
-0.1 0.1
-1 1
1 VDD-1.3
3.3
3
5
10
5
Units
V
mA
mA
mA
mA
mA
mA
V
kHz
V
V
V
V
V
V
V
mA
mA
%/V
%/C
V
%/C
V
mA
mA
mA
V
V
mA
mA
V
V
mA
Ohm
Ohm
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
Order On-line at www.hittite.com
13
13 - 2
Datasheet pdf - http://www.DataSheet4U.net/


Part Number HMC981
Description ACTIVE BIAS CONTROLLER
Maker Hittite Microwave Corporation
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HMC981 Datasheet PDF





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