dr65-0002 Tyco Electronics, dr65-0002 Datasheet

dr65-0002

Manufacturer Part Number

dr65-0002

Description

Linear Driver For Pin Diode Attenuators

Manufacturer

Tyco Electronics

Datasheet

1.DR65-0002.pdf (2 pages)

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Linear Driver for PIN Diode

Attenuators

Features

Description

M/A-COM's DR65-0002 is a break point free driver that

produces a logarithmic output current suitable for

linearizing PIN diode based shunt attenuators. This driver,

in conjunction with customer defined external components,

produces a linear transfer function (dB/V) between the

input control voltage of the driver and the attenuation

output of the PIN attenuator. The DR65-0002 has been

optimized for linearizing M/A-COM’s AT10-0009 or

AT10-0017 attenuators, but will function well with most

types of cathode grounded, PIN attenuators. The driver is

packaged in a SOW-16 package for commercial SMT

applications. A typical schematic for a 30 dB, 7.5 dB/V

linear attenuator is shown in Figure 1.

Circuit Description:

(Reference Figures 1 and 2)

The input divider, R1 and the sum of R2 and R3, sets the

overall transfer function of the circuit. To increase the

transfer function, decrease the Control Voltage and the

value of R1. Varying the value of R4 will optimize the

linearity of the circuit. One can achieve a very linear

transfer function (<± 1 dB/V) by driving the attenuator over

a smaller portion of its dynamic range. In the case of the

AT10-0009 and AT10-0017 attenuators, this would be

limited to a dynamic range of 28 and 25 dB, respectively.

Temperature compensation is a function temperature

coefficient of the thermistor, R3, and the ratio of R2 to R3,

and can only be optimized once the transfer function and

linearity component values have been established.

Linearizes PIN Diode Attenuators Over a Wide

Attenuation Range

Output Currents up to 12 mA

Operates with a Single Supply Voltage of +3V to +12V

Low Quiescent Currents

Single Control Voltage

SOW-16, Wide Body Plastic Package

Test Boards are Available

Tape and Reel Packaging Available

SOW-16

Package outline conforms to JEDEC standard MS-013AA

(0 to 4V)

Vcontrol

NOTES:

TRANSFER FUNCTION IS 7.5 dB/V

Vcontrol IS 0V to 4.0V

+Vcc IS 5.0V ± 5%

R3 IS A POSITIVE TEMPERATURE COEFFICIENT THERMISTOR

ATTENUATOR IS AT10-0009 OR AT10-0017

39K

(PTCT)

680

330

360

Figure 1

REF

DR65-0002

+Vcc

.01 µF

SCHEMATIC

LINEAR ATTENUATOR

1,3,4

5,6,8

ATTENNUATOR

RFoutput

RFin

V 4.00

16,14,13

9,11,12

Related parts for dr65-0002

dr65-0002 Summary of contents

Page 1

... Test Boards are Available n Tape and Reel Packaging Available Description M/A-COM's DR65-0002 is a break point free driver that produces a logarithmic output current suitable for linearizing PIN diode based shunt attenuators. This driver, in conjunction with customer defined external components, produces a linear transfer function (dB/V) between the input control voltage of the driver and the attenuation output of the PIN attenuator ...

Page 2

... Linear Driver for PIN Diode Attenuators Electrical Specifications, T Parameter Output Drive Current +V Supply Range CC +V Supply Tolerance CC +V Quiescent Current CC Linearity Transfer Function Settling Time Figure 2—Typical Attenuation Error DR65-0002 Driver with AT10-0017 Attenuator 2 1 -0.5 -1 -1.5 -2 Frequency: 1960 MHz Vcont 4.0V Pin Configuration Pin # ...

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