HMC980LP4E [ADI]
HMC980LP4E;
| 型号： | HMC980LP4E |
| 厂家： | 
ADI |
| 描述： | HMC980LP4E 电信 电信集成电路 |
| 文件： | 总24页 (文件大小：1464K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Features
Typical Applications
•ꢀ Automatic Gate voltage adjustment (No Calibra-
tion required)
•ꢀ Microwave Radio & VSAT
•ꢀ Military & Space
•ꢀ Supply Voltage (5V to 16.5V)
•ꢀ Bias both Enhancement or Depletion type
•ꢀ Test Instrumentation
devices
•ꢀ Fiber Optic Modulator Driver Biasing
•ꢀ CATV Laser Driver Biasing
•ꢀ Cellular Base Station
•ꢀ Adjustable Drain Current up to 1.6 A
•ꢀ Sink or source gate current
•ꢀ Internal negative voltage generation
•ꢀ Can be disabled to use external negative rail
•ꢀ Fast Enable/Disable
•ꢀ Wireless Infrastructure Equipment
•ꢀ Trigger-out Output for Daisy Chain
•ꢀ Power-Up and Power-Down Sequencing
•ꢀ Over/Under Current Alarm with built-in hystresis
•ꢀ 24 Lead 4mmx4mm QFN Package: 16mm2
Functional Diagram
General Description
HMC980LP4E is an active bias controller that can
automatically adjust the gate voltage of an external
amplifier to achieve constant bias current. With an
integrated controller, 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 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 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
Order On-line at www.hittite.com
1
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Electrical Specifications, TA = +25°C, VDD=12V, VDIG= 3.3V, Depletion Master
Unless Otherwise Noted
Parameter
Symbol
Vdd
Conditions
Min.
5
Typ.
Max.
16.5
Units
V
Supply Voltage
EN = VDIG
19
7.5
20
mA
mA
mA
mA
mA
mA
kHz
V
VDD = 5V
EN = GND
EN = VDIG
EN = GND
VDD Quiescent Current
IDD
VDD = 12V
9
VDIG= 3.3 V
3.5
6.5
300
1.44
VDIG Quiescent Current
IDIG
VDIG= 5 V
Charge Pump Oscillator Frequency
Voltage Reference
FOSC
VREF
Vinlow
Vinhigh
Vinlow
Vinhigh
1
1
V
Enable Input Threshold
ENTHRS
SWTHRS
1.4
1.4
V
V
S0, S1 Input Threshold
V
VDRAIN Characteristics
S1=S0=GND
0.05
0.3
0.6
0.3
0.6
1.2
1.6
A
A
S1=GND, S0=VDIG
S1=VDIG, S0=GND
S1=VDIG, S0=VDIG
DRAIN Current Adjustment Range
IDRAIN
A
1.2
A
DRAIN Current Change Over Digital Voltage
DRAIN Current Change Over Temperature
DRAIN Range
0.4
%/V
%/C
V
VDRAIN set to 12V,
IDRAIN set to 400 mA
ΔIDRAINV
0.023
VDRAIN
5
16.5
VDRAIN set to 12V,
IDRAIN set to 400 mA
VDRAIN Change Over Temperature
ΔVDRAIN
0.02
%/C
VNEG Characteristics
Negative Voltage Output
VNEG Current Sink
VNEG
INEG
-2.46
V
0
60
4
mA
VGATE Characteristics
GATE Current Supply
VGATE Low Level
IG
-4
mA
V
VG_MIN
VG_MAX
VNEG
VGATE High Level
VNEG+4.5
V
VG2 Characteristics
VG2<2V
6V>VG2>2V
VG2>6V
-0.1
-1
0.1
mA
mA
mA
V
VG2 Current Supply
IG2
1
5
-5
1
VG2 Adjustment Range
VDIG Characteristics
Adjustment Range
VG2
VDD-1.3
VDIG
IDIG
3.3
5
V
VDD= 12V,
VDIG Quiescent Current
3.5
mA
VDIG=EN =3.3 V
SW Characteristics
S1=S0=GND
2.8
1.55
0.85
0.7
Ohm
Ohm
Ohm
Ohm
S1=GND, S0=VDIG
S1=VDIG, S0=GND
S1=VDIG, S0=VDIG
Internal Switch Resistance
RDS_ON
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
2
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Bias Current Accuracy[1]
Bias Current Accuracy[2]
405
1475
1450
1425
1400
1375
1350
1325
1300
IDrain is set to: 388mA
IDrain is set to: 1409mA
400
395
390
385
380
375
370
+25 C
+85 C
-40 C
+25 C
+85 C
-40 C
3.3
3.5
3.6
3.8
4.0
4.2
4.3
4.5
4.7
4.8
5.0
3.3
3.5
3.6
3.8
4
4.2
4.3
4.5
4.7
4.8
5
VDIG (V)
VDIG (V)
Power Up Waveform
Shutdown Waveform
14
14
12
10
8
12
VDD (V)
VDD(V)
VDRAIN (V)
VDIG(V)
VDRAIN (V)
VDIG (V)
10
8
VG2 (V)
VG2 (V)
VNEG (V)
VGATE (V)
VNEG (V)
VGATE (V)
6
6
4
4
2
2
0
0
-2
-4
-2
-4
0
10
20
30
40
50
60
70
80
90 100
0
20
40
60
80 100 120 140 160 180 200
TIME (ms)
TIME (ms)
Enable Waveform
Disable Waveform
14
12
10
8
16
12
8
EN(V)
VDRAIN (V)
VG2 (V)
VNEG (V)
VGATE (V)
6
4
4
0
2
0
-4
-8
-12
EN(V)
-2
-4
-6
VDRAIN (V)
VG2 (V)
VNEG (V)
VGATE (V)
0
1
2
3
4
5
6
4
5
6
7
8
9
10
TIME (ms)
TIME (ms)
[1] HMC637LP5 is used as external amplifier
[2] HMC591LP5 is used as external amplifier
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
3
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Load Regulation @ VDD=5V, VDIG=3.3V,
Load Regulation @ VDD=5V, VDIG=3.3V,
SW0=GND, SW1=GND
SW0=3.3V, SW1=GND
6
6
5
5
4
4
+25C
+85C
-40C
3
3
+25C
+85C
-40C
2
2
300
50
100
150
200
250
300
350
400
450
500
550
600
IDRAIN (mA)
IDRAIN (mA)
Load Regulation @ VDD=16.5V,
Load Regulation @ VDD=16.5V,
VDIG=5.0V, SW0=GND, SW1=VDIG
VDIG=5.0V, SW0=VDIG, SW1=VDIG
17
17
16
15
14
13
16
15
14
13
+25C
+85C
-40C
+25C
+85C
-40C
1200
1300
1400
1500
1600
600
700
800
900
1000
1100
1200
IDRAIN (mA)
IDRAIN (mA)
VNEG Load Regulation @ VDD=5V
VNEG Load Regulation @ VDD=16.5V
-2
-2
-2.1
-2.1
-2.2
-2.3
-2.4
-2.5
+25 C
+85 C
-40 C
-2.2
-2.3
-2.4
-2.5
+25 C
+85 C
-40 C
0
5
10 15 20 25 30 35 40 45 50 55 60 65 70
INEG (mA)
0
5
10
15
20
25
30
INEG (mA)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
4
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
VNEG Load Transient VDD=5V
VNEG Load Transient VDD=16.5V
40
30
20
10
0
40
30
20
10
0
-2.2
-2.25
-2.3
-2.2
-2.25
-2.3
-2.35
-2.4
-2.35
-2.4
-10
-20
-30
-40
-10
-20
-30
-40
-2.45
-2.5
-2.45
-2.5
-2.55
-2.6
-2.55
-2.6
0
1
2
3
4
5
6
7
8
9
10
0
1
2
3
4
5
6
7
8
9
10
TIME (ms)
TIME (ms)
VGATE Load Regulation @ VDD=12V [1]
VG2 Load Regulation @ VDD=12V [2]
0
10
9
8
7
6
5
4
3
2
1
0
VG2=0.97V
VG2=1.81V
VG2=3.73V
VG2=6.68V
IDrain is set to : 388mA
-0.25
-0.5
-0.75
-1
IDrain is set to : 388mA
+25C
+85C
-40C
-1.25
-1.5
-8
-6
-4
-2
0
2
4
6
8
-7 -6 -5 -4 -3 -2 -1
0
1
2
3
4
5
6
7
IG2 (mA)
IG (mA)
VNEG Line Regulation vs. Supply Voltage
-2.44
No load condition
-2.46
-2.48
+25C
+85C
-40C
-2.5
5
7
9
11
13
15
17
SUPPLY VOLTAGE (V)
[1] HMC637LP5 is used as external amplifier
[2] HMC637LP5 is used as external amplifier
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
5
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Absolute Maximum Ratings
VDD
18V
Thermal Resistance (RTH
(Junction to package bottom)
)
10.6 °C/W
S0, S1, EN, ALM, VREF, VNEGFB,
VGATEFB, TRIG_OUT, ISENSE,
ALML, ISET, ALMH, FIXBIAS
-0.5V to VDIG + 0.5V
Storage Temperature
Operating Temperature
ESD Sensitivity (HBM)
-65 to +150 °C
-40 to +85 °C
Class 1A
CP_VDD
VDD-0.5V to VDD+0.5V
-0.5V to VDD + 0.5V
5.5V
CP_OUT, VG2_CONT, VG2, VDRAIN
Note that there are two different voltage domains on
HMC980LP4E; a high voltage domain Vdd, and a low voltage
domain VDIG. Take necessary precautions not to violate ABS
MAX ratings of each subdomains.
VDIG
VNEG
-4V to GND
VGATE
VNEG to GND
125 °C
Junction Temperature
Continuous Pdiss (T = 85 °C)
(Derate 94.79 mW/°C above 85 °C)
3.8 Watt
ELECTROSTATIC SENSITIVE DEVICE
OBSERVE HANDLING PRECAUTIONS
Outline Drawing
NOTES:
1. PACKAGE BODY MATERIAL: LOW STRESS INJECTION MOLDED PLASTIC SILICA AND SILICON IMPREGNATED.
2. LEAD AND GROUND PADDLE MATERIAL: COPPER ALLOY.
3. LEAD AND GROUND PADDLE PLATING: 100% MATTE TIN
4. DIMENSIONS ARE IN INCHES [MILLIMETERS].
5. LEAD SPACING TOLERANCE IS NON-CUMULATIVE.
6. PAD BURR LENGTH SHALL BE 0.15mm MAX. PAD BURR HEIGHT SHALL BE 0.05mm MAX.
7. PACKAGE WARP SHALL NOT EXCEED 0.05mm
8. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED TO PCB RF GROUND.
9. REFER TO HITTITE APPLICATION NOTE FOR SUGGESTED PCB LAND PATTERN.
Package Information
Part Number
Package Body Material
Lead Finish
MSL Rating
MSL1 [2]
Package Marking [1]
H980
XXXX
HMC980LP4E
RoHS-compliant Low Stress Injection Molded Plastic
100% matte Sn
[1] 4-Digit lot number XXXX
[2] Max peak reflow temperature of 260 °C
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
6
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Pin Descriptions
Pin Number
Function
Description
Interface Schematic
Bias supply Pin. Connect supply voltage to this pin with
appropriate filtering.
1,2
VDD
Control pins for internal switch resistance. If left floating,
default to HIGH.
Refer to Table-1 in Application Notes for recommended
settings
3.4
S0,S1
EN
Enable pin. Bias control loop is enabled when Ven
is HIGH(VDIG). If left floating, Ven defaults to HIGH
(enabled).
5
Over/under current alarm. Provides an active high signal
(VDIG) if the quiescent bias exceed the upper threshold
or drops below the lower threshold.
6
ALM
Trigger out signal. Generates a HIGH (3.3V) signal when
the active bias system stabilizes. This signal can be
used to trigger next device (ENABLE) if more than one
HMC980LP4E is used in a daisy chain.
19
7
TRIGOUT
CP_VDD
Bias supply for negative voltage generator. Connect
supply voltage with appropriate filtering. CP_VDD
supply voltage should be same as VDD
Negative voltage generator charge pump output. Nega-
tive voltage generator requires a flying capacitor, a
reservoir capacitor and two diodes to operate.
8
9
CP_OUT
3.3V-5V Digital Bias supply Pin. Connect supply voltage
to this pin with appropriate filtering..
VDIG
10
VREF
1.44V reference voltage.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
7
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Pin Descriptions (Continued)
Pin Number
Function
Description
Interface Schematic
Feedback (Control) pin for Negative Voltage Generator
Charge Pump. Float to activate the negative voltage
generator / Short to GND to disable the negative voltage
generator.
11
VNEGFB
Control pin for VGATEFB. Float VGATEFB when a
depletion mode transistor is biased. Selects the mode
of operation along with VNEGFB pin.
12
13
VGATEFB
Control voltage of the second gate pin VG2. Use a
resistor divider between VDD and GND to set the volt-
age. VG2 is typically 1.3V lower than the VG2CONT
VG2_CONT
14
15
VG2
Second gate control.
Negative input to the chip. Should be supplied with
CPOUT when negative voltage generator is enabled, or
connect to external VSS when negative voltage genera-
tor is enabled. Defaults to -2.5V. If a value different than
-2.5V required, please contact factory.
VNEG
Gate Control pin for external amplifier. Connect to the
gate (base) of the external amplifier. In order to guar-
antee stability, a 2.2μF capacitor should be connected
between the gate (base) terminal of the external ampli-
fier and GND as close to the amplifier as possible.
16
VGATE
Drain voltage. Should be connected to the supply termi-
nal of the external amplifier. A minimum 10 nF capacitor
has to be placed close to the external amplifier to
improve load regulation.
17, 18
VDRAIN
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
8
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Pin Descriptions (Continued)
Pin Number
Function
Description
Interface Schematic
Drain current adjustment pin. To adjust the bias current
of the external amplifier connect a resistor (Rsense)
from ISENSE pin to GND according to eqn(2) on page
13-15. A high precision resistor (e.g. 0.5%, 25 ppm
TCR) is recommended for good bias accuracy.
20
ISENSE
A high precision resistor (e.g. 0.5%, 25 ppm TCR)
to GND is recommended for good bias accuracy. The
value of the resistor sets the threshold value for under
current alarm. If alarm feature is not used ALML can be
shorted to ISet.
21
ALML
A high precision resistor (e.g. 0.5%, 25 ppm TCR)
between ALML and ISet is recommended for good bias
accuracy. The total external resistance from ISet pin to
GND should always be equal to 5 k Ω.
22
ISET
A high precision resistor (e.g. 0.5%, 25 ppm TCR) to
ISet pin is recommended for good bias accuracy. The
value of the resistor sets the threshold. If alarm feature
is not used ALMH can be shorted to ISet.
23
ALMH
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
9
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Pin Number
Function
Description
Interface Schematic
A high precision (e.g. 0.5%, 25 ppm TCR) 10K resistor
to ground is recommended for good bias accuracy.
24
FIXBIAS
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
10
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Evaluation Board Circuit
Notes:
[1] A variable resistor is assembled on R10 slot to adjust bias current for evaluating various different amplifiers without
soldering.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
11
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Evaluation PCB
GND
TRIGOUT
TP11
600-00098-00
TP12
R10
TP10
TP1
VDD
S0
VDRAIN
TP9
TP3
TP4
C2
VGATE
TP8
R4
C3
C6
S1
VG2
D1
R3
C5
TP5
TP6
TP2
C4
EN
GND
C7
TP7
ALM
VDIG
List of Materials for Evaluation PCB EVAL01-HMC980LP4E [1]
Item
Description
TP1-12
C1, C4
C2, C5, C9
C3
Test Point
4.7 µF Capacitor, 1210 Pkg.
10 nF Capacitor, 0402 Pkg.
100 pF Capacitor, 0402 Pkg.
1 µF Capacitor, 0603 Pkg.
10 µF Capacitor, 0603 Pkg.
2.2 µF Capacitor, X5R Pkg.
C6
C7
C8
Dual Series Shottky Barrier Diode,
BAT54SLT1
D1
R3
5.1k Ohm Resistor, 0402 Pkg
3.3k Ohm Resistor, 0402 Pkg.
Trim Potentiometer
R4
R10
R11, R12
R13
301 Ohm Resistor, 0402 Pkg.
4.7k Ohm Resistor, 0402 Pkg.
10k Ohm Resistor, 0402 Pkg.
R14
HMC980LP4E Switch Type ABC-High
Current Version-1
U1
[2]
PCB
EVAL01-HMC980LP4E Evaluation PCB
[1] Reference this number when ordering complete evaluation PCB
[2] Circuit Board Material: FR4
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
12
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Application Notes
Detailed Description
All amplifiers require stable quiescent current to operate at their specifications. Many amplifiers in the market require
external biasing to achieve stable quiscent current. HMC980LP4E is a fully integrated biasing solution for such
amplifiers.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 HMC980LP4E employs an integrated control circuitry to manage safe
power-up and power-down sequencing of the targeted amplifier. The HMC980LP4E can provide auto-bias solution to
virtually any amplifier in the market (both enhancement and depletion type) with a quiescent current of up to 1.6A and
a supply voltage of up to 16.5V.
The HMC980LP4E has an integrated negative voltage generator to create 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 HMC980LP4E achieves excellent bias stability over supply and temperature variations. The gate control can
both sink and source current ( 4 mA) which is required to compensate for charging gate current of the amplifier over
input power variations. The HMC980LP4E also generates a second gate voltage VG2. VG2 can be adjusted through
a resistor divider connected to VDD for the amplifiers which require second gate voltage.
The HMC980LP4E ensures safety of the external amplifier during turn on/off by automatically adjusting the sequence
of VDRAIN, VGATE and VG2 outputs.
The HMC980LP4E has a built-in over-under current alarm feature. If a fault conditions arises (either under or over
current) an alarm signal is generated (ALM, active HIGH). The current alarm signal provided in HMC980LP4E does
not affect the operation of the controller. It is included for monitoring purposes where a system level protection can be
implemented with external control circuitry.
The HMC980LP4E employs S0, S1 pins 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 HMC980LP4E has a built-in self protection feature to protect itself against short circuit conditions at the VDRAIN
output. The HMC980LP4E has also a built-in VNEG fault protection feature to protect both itself and the amplifier
under bias against short circuit conditions at the VNEG pin.
Digital Power Supply (VDIG)
The HMC980LP4E requires an external low voltage bias rail (3.3V to 5.0V). VDIG powers the internal logic circuitry.
VDIG draws and average of 3.5 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 HMC980LP4E 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 the 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 HMC980LP4E should be connected to the drain (collector) of the amplifier under bias for the
active bias control feedback and power-up/down sequencing to operate properly.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
13
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
There will be a voltage drop from VDD to VDRAIN due to finite RDS_ON resistance of the internal switch. To
compensate for this voltage drop choose the VDD value as shown in equation (1).
VDD = VDRAIN + IDRAIN x RDS_ON
(1)
where VDRAIN is the supply voltage of the external amplifier and IDRAIN is the desired constant bias current through
the external amplifier.
Note that RDS_ON resistance of the internal FET switch can be adjusted through S0, S1 pins based on the DRAIN
current requirement as shown in table-1. RDS_ON is typically equal to 0.7 Ohm when S0 and S1 are pulled up to
VDIG, and is typically equal to 2.8 Ohm when S0 and S1 are pulled down to GND. If S0 and S1 pins are left floating,
it is pulled up to VDIG through an internal weak pull-up. Recommended settings for the S0 and S1 positions are given
in Table-1. Not using the HMC980LP4E in the recommended settings may increase the power dissipation of the part
and the part-to-part variation.
Table 1. Recomended Current Range Configuration
Current Range (A)
0.05 to 0.3
0.3 to 0.6
Condition
RD_ON Value (Ohm)
S1=S0=GND
2.8
1.55
0.85
0.7
S1=GND, S0=VDIG
S1=VDIG, S0=GND
S1=VDIG, S0=VDIG
0.6 to 1.2
1.2 to 1.6
Negative Voltage Generator (VNEGOUT)
The HMC980LP4E has internal regulated charge pump circuitry to generate the negative voltage (VNEGOUT) required
for depletion mode devices. The HMC980LP4E generates -2.5V at the VNEGOUT output in default configuration. It
requires two diodes and two capacitors connected externally as shown in the sample application schematics. It can
be disabled through the VGATEFB and VNEGFB pins, if an enhancement device is targeted or a negative supply is
already available in the system. In this configuration, simply connect the available negative supply to the VNEG pin.
See Table-2 for the operation mode selection. The HMC980LP4E is designed to reject the ripple on the VNEGOUT
pin by isolating VNEGOUT from the VGATE. Thus, switching noise of the charge-pump is effectively isolated from the
external amplifier.
Enable/Disable (EN)
The active bias control loop is enabled when EN is pulled up to VDIG, and it is disabled when it is pulled down to
GND. If EN is left floating HMC980LP4E is enabled through an internal weak pull-up. Note that VNEG operation is
independent of EN condition. EN signal controls the operation of only VGATE, VG2 and VDRAIN outputs. When EN
pulled down to GND, the HMC980LP4E discharges VDRAIN and VG2 down to GND and it pulls the VGATE down to
VNEG. When EN pulled high to VDIG, HM980LP4E enables, VDRAIN and VG2, and enables the bias control loop to
automatically adjust the VGATE voltage. Please see the “Active Bias Control Loop” section for detailed explanation
and refer to the Enable and Disable waveforms for transient characteristics.
Active Bias Control Loop
The HMC980LP4E regulates the bias current (IDRAIN) of the amplifier under bias through VGATE output connected
to the gate of the external amplifier. In this closed loop operation the current passing through the amplifier under bias
is sampled and is used to automatically adjust VGATE to achieve constant quiescent bias through the external ampli-
fier.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
14
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
The HMC980LP4E continuously adjusts VGATE voltage to achieve constant DRAIN current over any supply, tem-
perature, process variations and threshold drifts due to aging. The part-to-part, temperature, and supply variation of
the HMC980LP4E is excellent. Thus, by using an accurate sense resistor connected to the ISENSE pin, expensive
calibration procedures in high volume production could be avoided.
The gate control of the HMC980LP4E is designed to both sink and source current in to the gate of the targeted ampli-
fier (at least 4 mA). This unique feature is important to achieve nearly constant quiescent bias through the amplifier
under varying gate current at different input power values.
The bias current passing through the external amplifier can be adjusted with RSENSE, where RSENSE is the R10
connected from ISENSE to GND. Use the relation given in equation (2) to set the desired bias current through the
external amplifier.
IDRAIN=150/Rsense (A)
(2)
VG2 Voltage Adjustment
The HMC980LP4E generates a second gate voltage (VG2). VG2 can be adjusted through a resistor divider connected
to VG2_CONT for the amplifiers which require second gate voltage. Eqn. (3) gives the formula to adjust VG2:
VG2(V)= VDD*R4/(R3+R4) - 1.3
(3)
For instance, choosing 5.1k Ohm as R3 and 3.3k Ohm as R4 sets VG2 voltage to 3.4V when VDD=12V. For improved
accuracy, choose resistor values below 5k Ohm on R3.
Self Protection Feature
Due to the small resistance of the internal switch FET between VDD and VDRAIN, a large amount of current may flow
through the HMC980LP4E. HMC980LP4E limits the maximum current to self protect itself under such fault conditions,
by turning off VDRAIN and VGATE.
The HMC980LP4E will remain in this protection mode until a full power-cycle or enable/disable cycle is applied.
VNEG Fault Detection Feature
In depletion mode operation VNEG is continuously monitored against short circuit fault to GND. If VNEG rises above
a preset value (typically -0.6V) the system and the external amplifier are disabled by pulling VDRAIN and VG2 to GND
and VGATE to VNEG. The system will stay in this stand-by mode until short fault at VNEG is fixed.
Over/Under Current Alarm
The HMC980LP4E provides over and under current alarm indicator ALM (pin#6) signal. The ALM is pulled up to VDIG
when the IDRAIN current exceeds 6% (With the given R11, R12, and R13 values in application circuit) of IDRAIN
regulation target value as shown in Figure 1. The alarm threshold level is user adjustable through R11,R12, and R13
according to the following equations:
Over current ALM Threshold = Iocth = IDRAIN (1+R11/(R12+R13)),
Under current ALM Threshold = Iucth = IDRAIN (1-R12/(R12+R13)) ,
where R12+R13 should always be equal to 5 kΩ (%1 accuracy)
Threshold values possess a small built-in hysterisis. The condition of ALM signal does not effect the operation of
HMC980LP4E. It is provided only for monitoring purposes.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
15
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Over current
Set current
Under current
ALARM
Figure 1. Current Alarm Behavior
Power-up and Enable Sequencing
To ensure the safety of the external amplifier, the HMC980LP4E provides an automatic power-up sequence for
enabling the active bias control loop. During start-up VDRAIN and VG2 are kept at GND while VGATE is taken to the
most negative supply available (VGATE=VNEG). This ensures that external amplifier is completely pinched-off before
VDRAIN is applied. When EN signal is received, VDRAIN is applied and the active bias loop is enabled. After the
VDRAIN is applied, VG2 is generated. The power-up sequence is completed by increasing the VGATE linearly until
the set IDRAIN value is reached.
For power-down and disabling, the same sequencing is applied in the reverse order.
Daisy-Chain Operation
HMC980LP4E produces a trigger out signal (TRIGOUT pin#19) when the quiscent current is in regulation. This trigger
signal can be used to enable additional HMC980LP4E chips in a chain of amplifiers. The triggering sequence can be
routed in any way, from input to output, or from output to input depending on the use. Figure-2 shows a sample use
of three HMC980LP4Es in an amplification chain. Please note that, only one of the HMC980LP4E (in master mode)
is used to generate the negative voltage and the remaining HMC980LP4E (in slave mode) is set to receive external
negative voltage (which is provided from the master depletion mode HMC980LP4E). Generating negative voltage
from a single HMC980LP4E reduces the number of the components in the system, and decreases the over all current
consumption.
Please note that, to ensure proper start-up, the system enable signal should be applied to the depletion master mode
device that has the negative voltage generator.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
16
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Figure 2. Daisy Chain Operation
Operation Modes
HMC980LP4E can be configured to bias both enhancement and depletion mode external amplifiers. The mode of
operation can be selected by setting two pins (VNEGFB, VGATEFB) as tabulated in Table-2. The connection to the
VNEGIN should be adjusted accordingly.
In order not to bias external amplifier in a wrong region, please make sure that the correct mode of operation is
selected before powering up the HMC980LP4E.
The HMC980LP4E does not allow the internal negative voltage generator to work if an enhancement mode is selected.
Therefore, if VNEGFB is left floating while VGATEFB is grounded, HMC980LP4E will stay in standby mode.
Please note that in depletion slave mode the external negative voltage should be between -2.3V to -3.5V for
HMC980LP4E to operate. If your application requires negative voltages outside this range please contact Hittite
application support.
Table 2. Mode Selection
VNEGFB
VGATEFB
FLOAT
VNEGIN
Description
Depletion mode transistor. Internal negative voltage generator is
active and generates -2.5V. Sample application schematic given
shown in Fig.3a.
MODE1
(Depletion/Master Mode)
Connected to
VNEGOUT
FLOAT
Depletion mode transistor. Internal negative voltage generator is
disabled. An external negative voltage less than -2.3V should be
connected to VNEGIN. Sample application schematic given shown
in Fig.3b.
MODE2
(Depletion/Slave Mode)
Connected to
External VSS
GND
FLOAT
---
FLOAT
GND
GND
GND
N/A
Not allowed. HMC980LP4E stays in standby.
MODE3
(Enhancement Mode)
Connected to
GND
Enhancement mode transistor. Internal negative voltage generator is
disabled. Sample application schematic given shown in Fig.3c.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
17
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Figure 3a. Depletion/Master Mode Amplifier Typical Application Circuit (Mode 1)
Figure 3b. Depletion/Slave Mode Amplifier Typical Application Circuit (Mode 2)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
18
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Figure 3c. Enhancement Mode Amplifier Typical Application Circuit (Mode 3)
For biasing Hittite amplifiers compatable with HMC980LP4E refer to the Table 3, where values of the external
components are provided on typical application circuit shown in Figure 3a.
Table 3 - List of Bias Settings for Various Hittite Amplifiers
VDRAIN
(V)
VDD
(V)
IDRAIN
(mA)
RSENSE
(kOhm)
R4
R3
VG2
(V)
Hittite Part Number
S1
S0
(kOhm)
(kOhm)
Gain Blocks & Drivers
HMC-AUH256
5
5.83
295
0.508
LNAs
open
open
-
GND
GND
HMC-ALH435
HMC-ALH444
HMC490
5
5
5
5
6
6
6
6
5
5.08
5.15
5.56
5.56
6.28
6.28
6.48
6.48
5.15
30
55
5.000
6.13
5.95
open
open
open
open
open
open
5.95
5
1.5
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
2.727
5
1.5
200
200
100
100
170
170
55
0.750
open
open
open
open
open
open
5
-
-
HMC490LP5
HMC594
0.750
1.500
-
HMC594LC3B
HMC609
1.500
-
0.882
-
HMC609LC4
HMC753LP4E
0.882
-
2.727
1.5
Linear & Power
1.875
HMC-ABH209
HMC-ABH264
HMC442
5
5
5
5
5.22
5.34
5.24
5.24
80
120
85
open
open
open
open
open
open
open
open
-
-
-
-
GND
GND
GND
GND
GND
GND
GND
GND
1.250
1.765
HMC442LC3B
84
1.786
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
19
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Table 3 - List of Bias Settings for Various Hittite Amplifiers (Continued)
VDRAIN
(V)
VDD
(V)
IDRAIN
(mA)
RSENSE
(kOhm)
R4
(kOhm)
R3
(kOhm)
VG2
(V)
Hittite Part Number
S1
S0
HMC442LM1
HMC499
5
5
5
5
5
5
5
5
5
5
5
5
5
7
5.24
5.56
5.56
5.62
5.74
5.77
6.22
5.92
5.77
5.99
5.81
6.12
5.81
8.11
85
200
200
220
475
900
1440
1080
900
640
950
400
950
1300
1.765
0.750
0.750
0.682
0.316
0.167
0.104
0.139
0.167
0.234
0.158
0.375
0.158
0.115
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
-
-
-
-
-
-
-
-
-
-
-
-
-
-
GND
GND
GND
GND
GND
VDIG
VDIG
VDIG
VDIG
GND
VDIG
GND
VDIG
VDIG
GND
GND
GND
GND
VDIG
GND
GND
GND
GND
VDIG
GND
GND
GND
GND
HMC499LC4
HMC-ABH241
HMC-APH403
HMC-APH460
HMC-APH462
HMC-APH473
HMC-APH478
HMC-APH510
HMC-APH518
HMC-APH596
HMC-APH608
HMC486
HMC486LP5 /
HMC486LP5E
7
7
7
8.11
8.11
8.11
1300
1300
1300
0.115
0.115
0.115
open
open
open
open
open
open
-
-
-
VDIG
VDIG
VDIG
GND
GND
GND
HMC487LP5 /
HMC487LP5E
HMC489LP5 /
HMC489LP5E
HMC498
5
5
7
5.70
5.70
7.70
250
250
820
0.600
0.600
0.183
open
open
open
open
open
open
-
-
-
GND
GND
VDIG
GND
GND
GND
HMC498LC4
HMC590
HMC590LP5 /
HMC590LP5E
7
7
7
7.70
8.14
8.14
820
1340
1340
0.183
0.112
0.112
open
open
open
open
open
open
-
-
-
VDIG
VDIG
VDIG
GND
GND
GND
HMC591
HMC591LP5 /
HMC591LP5E
HMC592
7
5
8.16
5.87
6.24
8.22
8.11
6.12
7.05
7.05
7. 16
7.02
6.52
8.02
7.02
6.77
6.77
750
310
0.200
0.484
0.188
0.190
0.380
0.375
0.400
0.400
0.200
0.125
0.125
0.125
0.125
0.167
0.167
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
open
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
GND
GND
GND
GND
GND
GND
GND
GND
GND
VDIG
VDIG
VDIG
VDIG
VDIG
VDIG
VDIG
GND
VDIG
VDIG
GND
GND
GND
GND
VDIG
GND
GND
GND
GND
GND
GND
HMC608LC4
HMC693
5
800
790
395
400
375
375
750
1200
1200
1200
1200
900
900
HMC756
7
HMC757
7
HMC757LP4E
HMC863
5
6
HMC863LP4E
HMC864
6
6
HMC906
6
HMC943LP5E
HMC949
5.5
7
HMC965LP5E
HMC968
6
6
HMC969
6
Wideband (Distributed)
HMC-AUH232
HMC-AUH249
HMC-AUH312
5
5
8
5.50
5.56
8.17
180
200
60
0.833
0.750
2.500
5.18
5.07
3.06
5
5
5
1.5
1.5
1.8
GND
GND
GND
GND
GND
GND
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
20
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Table 3 - List of Bias Settings for Various Hittite Amplifiers (Continued)
VDRAIN
(V)
VDD
(V)
IDRAIN
(mA)
RSENSE
(kOhm)
R4
(kOhm)
R3
(kOhm)
VG2
(V)
Hittite Part Number
S1
S0
HMC460
8
8
5
5
5
8
8
8
5
5
5
5
10
8
8
8.17
8.21
5.17
5.17
5.17
8.45
8.45
8.22
5.50
5.50
5.50
5.50
10.49
8.81
8.81
60
75
2.500
2.000
2.500
2.500
2.500
0.938
0.938
1.875
0.833
0.833
0.833
0.833
0.857
0.517
0.517
open
open
open
open
open
2.48
2.48
open
open
open
open
open
4.22
4.77
4.77
open
open
open
open
open
5
-
-
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
HMC460LC5
HMC463
60
-
HMC463LH250
HMC463LP5
HMC465
60
-
60
-
160
160
80
1.5
1.5
-
HMC465LP5
HMC562
5
open
open
open
open
open
5
HMC633
180
180
180
180
175
290
290
-
HMC633LC4
HMC634
-
-
HMC634LC4
HMC-930
-
3.5
3
3
HMC-459
5
HMC-464
5
HMC464LP5 /
HMC464LP5E
8
8.81
290
0.517
4.77
5
3
GND
GND
HMC559
HMC619
10
12
11.12
400
300
0.375
0.500
4.55
4.82
5
5
4
5
GND
GND
GND
GND
12.84
HMC619LP5 /
HMC619LP5E
12
12.84
300
0.500
4.82
5
5
GND
GND
HMC635
5
5
5.78
5.78
280
280
400
0.536
0.536
0.375
open
open
6.27
open
open
5
-
-
GND
GND
GND
GND
GND
GND
HMC635LC4
HMC637
12
13.12
6
HMC637LP5 /
HMC637LP5E
12
13.12
400
0.375
4.62
5
5
GND
GND
HMC659
8
8
8.84
8.84
11.12
11.12
300
300
400
400
0.500
0.500
0.375
0.375
4.74
4.74
3.80
3.80
5
5
5
5
3
GND
GND
GND
GND
GND
GND
GND
GND
HMC659LC5
HMC797
3
10
10
3.5
3.5
HMC797LP5E
Microwave & Optical Drivers
HMC870LC5
HMC871LC5
7
8
7.46
165
75
0.909
2.000
open
open
open
open
-
-
GND
GND
GND
GND
8.21
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
21
HMC980LP4E
v01.0911
ACTIVE BIAS CONTROLLER
HIGH CURRENT
Notes:
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
20 Alpha Road, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order On-line at www.hittite.com
22
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