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GaAs Constant Gamma Hyperabrupt Tuning Varactors
Features
q q q q q
MA46410 thru 480 Series
V3.00
Case Styles
Constant Gamma = 1.0, 1.25 or 1.5 High Q (up to 4000 at -4 Volts) Larger Capacitance Change with Voltage More Linear Frequency Tuning High and Nearly Constant Modulation Sensitivity
Description
The MA46450, MA46470 and MA46410 series of tuning varactors are hyperabrupt junction Gallium Arsenide diodes featuring constant gamma 1.0 (MA46450 series), 1.25 (MA46470 series) or 1.5 (MA46410 series). These diodes offer high Q (up to 4000) permitting excellent tuning performance from VHF through Ka band. Each part in this series exhibits the large change in capacitance versus bias voltage characteristic of hyperabrupt junctions. The standard capacitance tolerance is 10%, with tighter tolerances available. Capacitance matching at one or more bias voltages is also available. All diode types are available in a wide selection of ceramic packages and in chip form.
30
277
TYPICAL JUNCTION CAPACITANCE vs TUNING VOLTAGE
Applications
The constant gamma value of 1.0, 1.25 or 1.5 available with these diodes enables the circuit designer to produce significant improvements in circuit performance. Constant gamma tuning varactors permit more linear VCO frequency tuning than do conventional hyperabrupt tuning varactors. These varactors are particularly well suited for use in voltage tuned filters, analog phase shifters, and modulator circuits.
PACKAGED TUNING VARACTOR EQUIVALENT CIRCUIT
TUNING VOLTAGE VR + O (VOLTS)
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America: Tel. (800) 366-2266 Fax (800) 618-8883
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1
Asia/Pacific: Tel. +81 (03) 3226-1671 Fax +81 (03) 3226-1451
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Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020
GaAs Constant Gamma Hyperabrupt Tuning Varactors Electrical Specifications at 25C
MA46450 Series
Voltage6
MA46410 thru 480 Series
V3.00
Gamma = 1.0
MA46470 Series
Gamma = 1.25
Reverse = 22 Volts minimum Gamma4 = 0.9 - 1.1, VR = 2 - 20 Volts Junction Capacitance Ratio (CJ2/CJ20) = 5.0 - 8.0 Total2, 3, 5, 7 Capacitance Cases1 @ -4 Volts Style Min./Max. (pF) 30 30 30 30 30 30 30 30 0.5 0.7 1.0 1.5 1.8 2.2 3.3 4.7 Total Capacitance7 Ratio (2/20) Min./Max. 2.0-3.8 2.9-4.4 3.6-5.2 3.8-5.5 4.1-6.1 4.1-6.1 4.5-6.7 4.8-7.2 50 MHz Q at -4 VoIts Typical 4000 4000 3000 3000 3000 3000 2000 1500
Reverse Voltage6 = 22 Volts minimum Gamma4 = 1.13 - 1.38, VR = 2 - 20 Volts Junction Capacitance Ratio (CJ2/CJ20) = 8.15 - 12.99 Total2, 3, 5, 7 Capacitance @ -4 Volts Min./Max. (pF) 0.5 0.7 1.0 1.2 1.5 1.8 2.0 2.2 2.7 3.3 3.7 4.7 5.6 6.8 8.2 10.0 Total 50 MHz Capacitance7 Q at Ratio (2/20) -4 Volts Min./Max. Minimum 2.2/4.1 3.6/5.6 4.8/7.4 4.8/7.4 5.0/7.4 6.6/8.7 6.6/8.7 6.6/8.7 6.4/10.0 6.4/10.0 6.8/11.0 6.9/11.1 7.2/11.5 7.2/11.5 7.2/11.5 7.5/12.0 4000 4000 3000 3000 3000 3000 3000 3000 2000 2000 2000 1500 1500 1500 1500 1500
Model Number MA46450 MA46451 MA46452 MA46454 MA46455 MA46457 MA46459 MA46461
Model Number MA46470 MA46471 MA46472 MA46473 MA46474 MA46475 MA46476 MA46477 MA46478
Case1 Style 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30
MA46410 Series
Gamma = 1.5
MA46479 MA46480 MA46481 MA46482 50 MHz Q at -4 Volts Typical 3000 2500 2500 1800 1800 1200 1200 1200
Breakdown Voltage6 = 18 Volts minimum Gamma4 = 1.4 - 1.6, VR = 2 - 12 Volts Junction Capacitance Ratio (CJ2/CJ12) = 6.2 - 10.84 Total2, 6, 7 Capacitance @ -4 Volts Min./Max. (pF) 0.45-0.60 0.90-1.10 1.62-1.98 2.42-2.97 3.33-4.22 4.22-5.17 5.04-6.16 9.00-11.00 Total Capacitance7 Ratio (2/12) Min./Max. 2.7-4.3 4.2-5.7 5.2-4.9 5.7-7.6 6.0-8.1 6.2-8.3 6.3-8.4 6.6-8.8
MA46483 MA46484 MA46485
Model Number MA46410 MA46413 MA46416 MA46418 MA46420 MA46421 MA46422 MA46425
Case1 Style 30 30 30 30 30 30 30 30
Absolute Maximum Ratings at +25C
Parameter Operating Temperature* Storage Temperature Reverse Voltage
1088 case style is 125C.
Absolute Maximum -65C to +175C -65C to +200C Breakdown Voltage
Notes: 1. All GaAs tuning varactors are available in chip form as well as the case styles shown on the following page. When ordering, specify the desired case by adding the case designation as a suffix to the type number. 2. Case parasitics (Cp and Ls) are given for most case styles along with case outlines in the appendix. The Cp values listed typically have tolerances of 0.02 pF. 3. The nominal tolerance at -4 Volts is 10%. Closer tolerances are available upon request. By adding the suffix A to the part number, a tolerance of 5% at -4 Volts is guaranteed. 4. The values guaranteed for gamma are measured on unpackaged chips. The total capacitance versus bias voltage curve will deviate slightly from the chip capacitance versus bias voltage curve due to the package parasitic capacitance (Cp). 5. Capacitance is measured at 1 MHz. 6. Reverse voltage (VB) is measured at 10 microamps. 7. The total capacitance and capacitance ratios shown are for diodes housed in case style 30. Other case styles will result in different values.
Environmental Ratings PER MIL-STD-750
MIL Method Storage Temperature 1031 Temperature Cycle 1051 Shock 2016 Vibration 2056 Constant Acceleration 2006 Humidity 1021 Level See maximum ratings 10 cycles, -65C to +175C 500 g's 15 g's 20,000 g's 10 days
* The maximum storage and operating temperature of the plastic
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
GaAs Constant Gamma Hyperabrupt Tuning Varactors Case Styles (See appendix for complete dimensions)
MA46410 thru 480 Series
V3.00
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
GaAs Constant Gamma Hyperabrupt Tuning Varactors Typical Performance Curves
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE ( = 1.0) (PARTS IN CASE STYLE 30)
MA46410 thru 480 Series
V3.00
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE ( = 1.0) (CHIPS)
.1 VR (VOLTS)
100
.1 VR (VOLTS)
100
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE ( = 1.25) (PARTS IN CASE STYLE 30)
JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE ( = 1.25) (CHIPS)
.1 VR (VOLTS)
100
.1 VR (VOLTS)
100
Specifications Subject to Change Without Notice.
4
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
GaAs Constant Gamma Hyperabrupt Tuning Varactors
MA46410 thru 480 Series
V3.00
Typical Performance Curves (Cont'd)
TOTAL CAPACITANCE vs REVERSE BIAS VOLTAGE ( = 1.5) (PARTS IN CASE STYLE 30) JUNCTION CAPACITANCE vs REVERSE BIAS VOLTAGE ( = 1.5) (CHIPS)
.1
1 VR (VOLTS)
10
100
.1
1 VR (VOLTS)
10
100
GAMMA vs VOLTAGE
VR (VOLTS)
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America: Tel. (800) 366-2266 Fax (800) 618-8883
s
5
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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