Beam Lead Constant Gamma
GaAs Tuning Varactors
Features
q
q
q
q
q
q
q
MA46580 thru 589 Series
V3.00
Case Style 992
Gamma of 1.0 and 1.25 Available
Constant Gamma for Linear Tuning
Strong Beam Construction
Low Parasitic Capacitance
High Q
Close Capacitance Tracking
Minimum 10 Gram Beam Strength
Description
The MA46580 through 589 series of beam lead constant
gamma tuning varactors are hyperabrupt junction gallium
arsenide diodes with a constant gamma of 1.0 or 1.25. The
high Q values and elimination of package parasitics make
these varactors very attractive for voltage controlled oscil-
lators that require linear tuning. These tuning diodes are
useful at frequencies as high as 40 GHz.
The beam lead design eliminates almost all package par-
asitics resulting in improved linearity of the junction
capacitance change with voltage. This improves tracking
between diodes and can improve VCO linearity.
The standard capacitance tolerances is ±20%. Tighter tol-
erances of ±10% and ±5% are available. Matched pairs or
sets are also available with the above tolerances.
Applications
These beam lead constant gamma tuning varactors are
particularly useful in broadband VCOs, where linear fre-
quency tuning is an important feature. They are also very
useful for FM modulating a source for telecommunication
transmitters and in many cases such circuits can be
designed without a linearization circuit.
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
1
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
Beam Lead Constant GaAs Arsenide Tuning Varactors
MA46580 thru 589 Series
V3.00
Electrical Specifications at 25°C
Minimum Voltage Rating 18 Vdc
2,4
Gamma = 1.25 ± 10% From 2-12 Volts
Model Number
Q at 4 Volts
3
C
T
at 4 Volts
1
CT
2
CT
12
MA46580
3000
0.5
4.5:1
6.5:1
MA46581
3000
0.7
4.5:1
6.5:1
MA46582
2500
1.0
4.5:1
6.5:1
MA46583
2000
1.5
4.5:1
6.5:1
MA46584
2000
2.0
4.5:1
6.5:1
Units
(Typ.)
pF (± 20%)
Min.
Max.
Minimum Voltage Rating 18 Vdc
2,4
Gamma = 1.0 ± 10% from 2-12 Volts
Model Number
Q at 4 Volts
3
C
T
at 4 Volts
1
CT
2
CT
12
MA46585
3000
0.5
3.2:1
5.2:1
MA46586
3000
0.7
3.2:1
5.2:1
MA46587
2500
1.0
3.2:1
5.2:1
MA46588
2000
1.5
3.2:1
5.2:1
MA46589
2000
2.0
3.2:1
5.2:1
Units
(Typ.)
pF ( ± 20%)
Min.
Max.
Notes:
1. Capacitance is measured at 1 MHz.
2. All junctions are hyperabrupt with nominal y = 1.0 or 1.25.
3. Diode Q is measured at 3 GHz and at -4 volts and extrapolated to
50 MHz. Tested in M/A-COM’s microstrip test fixture.
4. Maximum leakage current: I
R
- 20 nA max. at -14V and 25°C
I
R
- 10 µA max. at -18V and 25°C
Absolute Maximum Ratings at 25°C
Parameter
Operating Temperature
Storage Temperature
Reverse Voltage
Power Dissipation
Beam Strength
Absolute Maximum
-65° to 150°C
-65° to 200°C
18 Volts
25 mW at 25°C
10 grams min.
Ordering Information
Units available only in case style 992. See appendix for
complete dimensions.
Environmental Ratings
PER MIL-STD-750
MIL
Method
Storage Temp.
Temperature Cycle
Shock
Vibration
Constant Acceleration
Humidity
1031
1051
2016
2056
2006
1021
Level
See maximum ratings
10 cycles, -65° to +175°C
500 g’s
15 g’s
20,000 g’s
10 days
Specifications Subject to Change Without Notice.
2
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
M/A-COM, Inc.
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
Beam Lead Constant GaAs Arsenide Tuning Varactors
MA46580 thru 589 Series
V3.00
Typical Performance Curves
CAPACITANCE vs VOLTAGE
GAMMA = 1.25 ± 10% FROM 2-12 VOLTS
CAPACITANCE RATIO C
T-2
/C
TV
(MA46580 THRU 589)
CAPACITANCE vs VOLTAGE
Gamma = 1.0 ± 10% from 2-12 Volts
CAPACITANCE RATIO C
T-2
/C
TV
(MA46580 THRU 589)
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
Fax (800) 618-8883
s
3
Asia/Pacific: Tel. +81 (03) 3226-1671
Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595
Fax +44 (1344) 300 020
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