MACOM AT-273TR, AT-273 Datasheet

Digital Attenuator, 32 dB, 2-Bit,
TTL Driver, DC - 2.0 GHz

V 7.00

AT-273

Features

n Attenuation: 16.0 dB Steps to 32 dB
n Low DC Power Consumption
n Hermetic Surface Mount Package
n Integral TTL Driver
n 50 ohm Impedance
n Temperature Stability: ±0.18 dB from -55°C to +85°C

Typ.

n Tape and Reel Packaging Available

Description

M/A-COM's AT-273 is a GaAs FET digital attenuator
with a 16.0 dB minimum step size and a 32 dB total
attenuation range. This attenuator and integral TTL driver
is in a hermetically sealed ceramic 16-lead surface mount
package. The AT-273 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.

CR-11

Electrical Specifications: TA = 25°C

Parameter Test Conditions Frequency Units Min Typ Max

Insertion Loss — DC - 0.5 GHz

Attenuation Accuracy C1 Bit

VSWR Full Range DC - 2.0 GHz Ratio — — 1.6:1

Trise, Tfall 10% to 90% — ns — 7 —

Ton, Toff 50% Cntl to 90% / 10% RF — ns — 28 —

Transients In-Band (peak-to-peak) — mV — 30 —

1 dB Compression Input Power

Input IP3 Two-tone inputs up to +5 dBm 0.05 GHz

Input IP2 Two-tone inputs up to +5 dBm 0.05 GHz

Vcc

-Vee
Vctl

Vctl

Full Attenuation (32 dB)
Full Attenuation (32 dB)
Full Attenuation (32 dB)

Input Power

—
—

Logic (0) TTL
Logic (1) TTL

DC - 1.0 GHz
DC - 2.0 GHz

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

0.05 GHz

0.5 - 2.0 GHz

0.5 - 2.0 GHz

0.5 - 2.0 GHz
—

—
—

—

dB
dB
dB

± 3% of attenuation setting in dB

± 3% of attenuation setting in dB
± 3% of attenuation setting in dB, -1 dB
± 3% of attenuation setting in dB, -3 dB

dBm
dBm

dBm
dBm

dBm
dBm

V
V

V
V

—
—
—

—
—

—
—

—
—

4.5

-8.0

0.0

2.0

—
—
—

+20
+28

+38
+48

+44
+68

5.0
—

—
—

1.6

1.7

1.9

—
—

—
—

—
—

5.5

-5.0

0.8

5.0

Digital Attenuator, 32 dB, 2-Bit, TTL Driver, DC - 2.0 GHz

Electrical Specifications: TA = 25°C

Parameter Test Conditions Frequency Units Min Typ Max

Input Leakage Current (Low)

Input Leakage Current (High)

Icc Vcc = 4.5 to 5.5V

Vctl = 0 to 0.8V, or Vcc –2.1V to Vcc

-Iee Vee = -5.0 to -8.0V — mA — — -1

0 to 0.8V

2.0 to 5.0V

AT-273

V 7.00

—
—

— mA — — 2.0

µA
µA

—
—

—
—

1.0

1.0

Pin Configuration

Pin No. Function Pin No. Function

1 C2 9 RF1
2 GND 10 GND
3 C1 11 GND
4 GND 12 GND
5 GND 13 Vee

6 GND 14 Vcc
7 GND 15 NC
8 RF2 16 NC

Truth Table

C1 C2 Attenuation

0 0 Loss, Reference
0 1 16.0 dB
1 1 32.0 dB

0 = TTL Low; 1 = TTL High

Absolute Maximum Ratings 1

Parameter Absolute Maximum

Max. Input Power

0.05 GHz

0.5 - 2.0 GHz
+Vcc +5.5V

-Vee -8.5V

Control Voltage -0.5 to Vcc + 0.5V

Operating Temperature -55°C to +125°C

Storage Temperature -65°C to +150°C

1. Operation of this device above any one of these

parameters may cause permanent damage.

+27 dBm
+34 dBm

Ordering Information

Part Number Package

AT-273 Bulk Packaging

AT-273TR Tape and Reel

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.

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