Page 1 of 8

Digital Step Attenuator

CASE STYLE: DG983-2

The Big Deal

• Wideband, operates up to 4 GHz

• Immune to latchup

• High IP3, 52 dBm

Product Overview

The DAT-31R5A+ series of 50Ω digital step attenuators provides adjustable attenuation from 0 to 31.5 dB

in 0.5 dB steps. The control is a 6-bit serial/parallel interface, and the attenuators operate with either a

single positive or dual (positive and negative) supply voltage. DAT-31R5A+ series models are produced by

a unique CMOS process on silicon, offering the performance of GaAs with the advantages of conventional

CMOS devices.

DAT-31R5A+ Series

50Ω 0 to 31.5 dB, 0.5 dB Step DC to 4.0 GHz

Surface Mount

Feature

Advantages

Wideband operation, specified from DC

to 4.0 GHz

Can be used in multiple applications such as communications, satellite and defense,

reducing part count.

Serial or parallel interface

Models available with serial or parallel interface mode to suit customer demand.

Good VSWR, 1.2:1 typ.

Eases interfacing with adjacent components and results in low amplitude ripple.

Single positive supply models:

(Model suffixes: -SP+ and –PP+)

+2.3 to +3.6V+

Use of single positive supply simplifies power supply design. An internal negative voltage

generator supplies the desired negative voltage. Single positive supply results in excellent

spurious performance, -140 dBm typical.

Dual supply models:

(Model suffixes: -SN+ and –PN+)

+2.7 to +3.6V (Positive) and

-3.6 to -3.2V (Negative)

Dual supply provides spurious-free operation. It also allows fast switching up to 1 MHz (vs.

25 kHz for single supply).

Useable over a wide range of supply

voltages, +2.3/2.7 to 5.2V

Wide range fo positive operating voltages allows the DAT-31R5A+ Series of models to be

used in a wide range of applications. See Application Note AN-70-006 for operation above

+3.6V

Footprint compatible to DAT-31R5-XX+

Series (XX=SN/SP/PN/PP)

Can fit into existing footprint and provide wideband performance, to 4 GHz instead of

2.4 GHz.

Key Features