MA46478中文资料

V3.00

GaAs Constant Gamma

Hyperabrupt Tuning Varactors

MA46410 thru 480 Series

Features

q Constant Gamma = 1.0, 1.25 or 1.5q High Q (up to 4000 at -4 Volts)

q Larger Capacitance Change with Voltage q More Linear Frequency Tuning

q

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 tun-ing 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 toler-ances 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.

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 frequen-cy tuning than do conventional hyperabrupt tuning varac-tors. These varactors are particularly well suited for use in voltage tuned filters, analog phase shifters, and modulator

circuits.

Case Styles

30

277

V3.00

* The maximum storage and operating temperature of the plastic

1088 case style is 125°C.

Absolute Maximum Ratings at +25°C

Electrical Specifications at 25°C

MA46450 Series

Gamma = 1.0

Reverse Voltage 6= 22 Volts minimum Gamma 4= 0.9 - 1.1, V R = 2 - 20 Volts

Junction Capacitance Ratio (C J2/C J20) = 5.0 - 8.0

MA46470 Series

Gamma = 1.25

Reverse Voltage 6= 22 Volts minimum Gamma 4= 1.13 - 1.38, V R = 2 - 20 Volts

Junction Capacitance Ratio (C J2/C J20) = 8.15 - 12.99

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 (C p and L s ) are given for most case styles along with case outlines in the appendix.The Cp values listed typically have toler-ances of ±0.02 pF .

3.The nominal tolerance at -4 Volts is ±10%.Closer tolerances are avail-able upon request.By adding the suffix A to the part number, a toler-ance 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 (V B ) 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 val-ues.

Total 2, 6, 7Total

50 MHz Capacitance Capacitance 7Q at Model Case 1@ -4 Volts Ratio (2/12)-4 Volts Number Style Min./Max.(pF)Min./Max.

Typical MA46410300.45-0.60 2.7-4.33000MA46413300.90-1.10 4.2-5.72500MA4641630 1.62-1.98 5.2-4.92500MA4641830 2.42-2.97 5.7-7.61800MA4642030 3.33-4.22 6.0-8.11800MA4642130 4.22-5.17 6.2-8.31200MA4642230 5.04-6.16 6.3-8.41200MA46425

30

9.00-11.00

6.6-8.8

1200

Environmental Ratings PER MIL-STD-750

MIL Method

Level

Storage Temperature 1031See maximum ratings

Temperature Cycle 105110 cycles, -65°C to +175°C Shock 2016500 g’s Vibration 205615 g’s Constant Acceleration 200620,000 g’s Humidity 1021

10 days

MA46410 Series Gamma = 1.5

Breakdown Voltage 6= 18 Volts minimum Gamma 4= 1.4 - 1.6, V R = 2 - 12 Volts

Junction Capacitance Ratio (C J2/C J12) = 6.2 - 10.84

V3.00 Case Styles (See appendix for complete dimensions)

.1100

V R(VOLTS).1100

V R(VOLTS)

.1100

V R(VOLTS)

.1100

V R(VOLTS)

.1110100

V R(VOLTS)

V R(VOLTS).1110100

V R(VOLTS)