MACOM AT-283PIN Datasheet

Digital Attenuator, 15.5 dB, 5-Bit,
TTL Driver, DC - 2 GHz

AT-283

CR-12

V 5.00

Electrical Specifications1: TA = 25°C

Features

n Attenuation: 0.5 dB Steps to 15.5 dB

2

n Temperature Stability: ± 0.18 dB from –55°C

to +85°C Typical

n Low DC Power Consumption
n Hermetic Surface Mount Package
n Integral TTL Driver
n 50 O Nominal Impedance

Description

M/A-COM’s AT-283 is a GaAs FET 5-bit digital attenuator
with a 0.5 dB minimum step size and 15.5 dB total
attenuation. This attenuator and integral TTL driver is in a
hermetically sealed ceramic 16-lead surface mount package.
The AT-283 is ideally suited for use where accuracy, fast
switching, very low power consumption and low
intermodulation products are required. Typical applications
include dynamic range setting in precision receiver circuits
and other gain/leveling control circuits. Environmental
screening is available. Contact the factory for information.

Parameter Test Conditions Units Min Typical Max

Reference

Insertion Loss

DC-0.5 GHz
DC-1.0 GHz
DC-2.0 GHz

dB
dB
dB

—
—
—

—
—
—

2.2

2.5

2.9

Attenuation Accuracy 3 Any Single Bit DC-2.0 GHz

Any Combination of Bits DC-2.0 GHz

± (0.25 +3% of attenuation setting in dB) dB
± (0.25 +3% of attenuation setting in dB) dB

or ± 0.4 dB, whichever is greater

VSWR DC-1.0 GHz

DC-2.0 GHz

—
—

—
—

—
—

1.6:1

1.7:1

Trise, Tfall

Ton, Toff

Transients

10% to 90%

50% Control to 90/10% RF

In-band (peak—peak)

nS
nS

mV

—
—
—

10
27
22

—
—
—

1 dB Compression 4 Input Power 0.05 GHz

Input Power 0.5-2.0 GHz

dBm
dBm

—
—

+20
+28

—
—

Input IP3

4

For two-tone input power 0.05 GHz

up to +5 dBm 0.5-2.0 GHz

dBm
dBm

—
—

+40
+47

—
—

1. All specifications apply when operated with bias voltages of +5.0V for VCC and –5.0V to -8.0V for VEE, and 50 O impedance at
all ports unless otherwise specified.

2. Above reference insertion loss.

3. This attenuator is guaranteed monotonic.

4. VEE = -5.0V for the typical numbers given.

Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz

AT-283

Specifications subject to change without notice.

n North America: Tel. [phone]
n Asia/Pacific: Tel.[phone], Fax [phone]
n Europe: Tel. [phone], Fax[phone]

Visit www.macom.com for additional data sheets and product information.

V 5.00

2

Parameter Test Conditions Units Min Typical Max

Input IP2 4 For two-tone input power 0.05 GHz

up to +5 dBm 0.5-2.0 GHz

dBm
dBm

—
—

+53
+68

—
—

ICC VCC = 4.5 to 5.5V

Vctl = 0 to 0.8V, or V

CC

- 2.1V to VCC

mA — — 5.0

IEE VEE = -5.0 to –8.0V mA — — 1.0

Vctl
Vctl

Logic 0 (TTL)
Logic 1 (TTL)

V
V

0.0

2.0

—
—

0.8

5.0

Input Leakage Current (Low)

Input Leakage Current (High)

0 to 0.8V

2.0 to 5.0V

µA
µA

—
—

—
—

1.0

1.0

VCC
VEE

—
—

V
V

4.5

-8.0

5.0
—

5.5

-5.0

Recommended PCB Layout

Absolute Maximum Ratings

Parameter Absolute Maximum

Maximum Input Power

0.05 GHz

0.5-2.0 GHz

+27 dBm
+34 dBm

Supply Voltages

VCC
VEE

+5.5V

-8.5V

Control Voltage -0.5V to VCC + 0.5V

Operating Temperature -55°C to +125°C

Storage Temperature -65°C to +150°C

Note: Operation of this device above any on of these
parameters may cause permanent damage.

Truth Table

Control Inputs

C1 C2 C3 C4 C5 Attenuation

0 0 0 0 0 Reference
1 0 0 0 0 0.5 dB
0 1 0 0 0 1 dB
0 0 1 0 0 2 dB
0 0 0 1 0 4 dB
0 0 0 0 1 8 dB
1 1 1 1 1 15.5 dB

0 = TTL Low; 1 = TTL High

Functional Schematic (Top View)

Electrical Specifications1: TA = 25°C