|
|
PDF HMC981LP3E Data sheet ( Hoja de datos )
| Número de pieza | HMC981LP3E | |
| Descripción | ACTIVE BIAS CONTROLLER | |
| Fabricantes | Hittite Microwave Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de HMC981LP3E (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
|
No Preview Available !
www.DataSheet.co.kr
v01.0411
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
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.
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/
1 page  
www.DataSheet.co.kr
v01.0411
HMC981LP3E
ACTIVE BIAS CONTROLLER
13
VGATE Load Regulation @ VDD=6V
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
+25C
+85C
-40C
-3
-1.25 -1 -0.75 -0.5 -0.25 0 0.25 0.5 0.75 1 1.25
IG (mA)
VG2 Load Regulation @ VDD=6V
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
-2 -1.5 -1 -0.5 0 0.5
IG2 (mA)
VG2=0.9V
VG2=1.78V
VG2=2.74V
VG2=3.71V
1 1.5 2
13 - 5
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/
5 Page 
www.DataSheet.co.kr
v01.0411
HMC981LP3E
ACTIVE BIAS CONTROLLER
13
Application Notes
Detailed Description
The HMC981LP3E is a fully-integrated Active Bias Controller (ABC) that automatically adjusts the gate voltage of
amplifiers operating in the Class-A regime. With an internal feedback the automatic gate voltage control achieves
constant quiescent bias through the amplifier under bias, independent of temperature and amplifier threshold
variations. The quiescent current is adjusted with a resistor connected externally. The HMC981LP3E employs an
integrated control circuitry to achieve safe power-up and power-down sequencing of the targeted amplifier. The
HMC981LP3E can provide auto-bias solution virtually any amplifier in the market (both enhancement and depletion
type) with a quiescent current of up to 200 mA and a supply voltage of up to 12V.
The HMC981LP3E has an integrated negative voltage generator to synthesize negative voltages required to drive
depletion mode amplifiers. If an external negative supply is already available or an enhancement mode device is
targeted, the negative voltage generator can be disabled.
The HMC981LP3E achieves excellent bias stability over supply and temperature variations with low supply voltage
down to 4V. The gate control can both sink and source current (±0.8 mA) to achieve constant bias current over input
power variations applied to the amplifier. The HMC981LP3E also generates a second gate voltage (VG2). VG2 can be
adjusted through a resistor divider connected to VDD for amplifiers which require second gate voltage.
The HMC981LP3E ensures the protection of the external amplifier during turn on/off by adjusting the sequence of
VDRAIN, VGATE and VG2 outputs. HMC981LP3E controls the bias current of the amplifier under bias with the gate
control driver. The current passing through the amplifier is continuously sampled and is used to control the VGATE
voltage connected to the gate of the amplifier.
The HMC981LP3E employs a SW pin to control RDS_ON resistance of the internal switch between VDD and VDRAIN.
Refer to the section under the “Supply and Drain Voltage” section for details.
The HMC981LP3E has a built-in short circuit protection feature to protect both itself and the amplifier under bias
against short circuit conditions at the VDRAIN output. Refer to the section under the “Short Circuit Protection” section
for details.
Digital Power Supply (VDIG)
The HMC981LP3E requires an external low voltage bias rail (3.3V to 5.0V). VDIG powers the internal logic circuitry.
VDIG draws an average of 3 mA from a 3.3V. VDIG can accept voltages up to 5.0V.
Supply and Drain Voltage (VDD and VDRAIN)
The VDD supply to the HMC981LP3E is directly connected to the VDRAIN output through an internal MOSFET switch.
This internal MOSFET is controlled through power-up sequencing which ensures that no voltage is applied to drain
of the external amplifier until the gate voltage is pulled down to VNEG(ensuring external amplifier is pinched-off). The
VDRAIN output of the HMC981LP3E should be connected to the drain (collector) of the amplifier under bias for the
active bias control feedback and power-up/down sequencing to work.
13 - 11
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/
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HMC981LP3E.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| HMC981LP3E | ACTIVE BIAS CONTROLLER | Hittite Microwave Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |