MACOM AT20-0273 Datasheet

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

V 3.00

AT20-0273

Features

n Attenuation: 16 dB steps to 32 dB
n Temperature Stability: ± 0.18 dB from –40°C to +85°C

Typical

n Low DC Power Consumption
n Surface Mount Package
n Integral TTL Driver
n Low Cost/High Performance
n 50 Ohm Nominal Impedance

Description

M/A-COM’s AT20-0273 is a GaAs FET digital
attenuator with a 16 dB minimum step size and 32 dB total
attenuation. This attenuator and integral TTL driver is in a
sealed ceramic 16-lead surface mount package. The
AT20-0273 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. Available with
enhanced performance as fully hermetic version.
Environmentally screenable as P/N AT-273.

CR-11

Electrical Specifications: TA = 25°C1

Parameter Test Conditions Frequency Units Min Typ Max

Reference Insertion Loss — DC - 0.5 GHz

Attenuation Accuracy 2 C1 Bit

Full Attenuation (32 dB)

VSWR — DC - 2.0 GHz Ratio — — 1.4:1

Trise, Tfall 10% to 90% — ns — 50 —

Ton, Toff 50% Control to 90/10% RF — ns — 150 —

Transients In-Band (peak-peak) — mV — 50 —

1 dB Compression Input Power

Input Power

Input IP3 For two-tone Input Power

Up to +5 dBm

Input IP2 For two-tone Input Power

Up to +5 dBm
Vcc — — V 4.5 5.0 5.5
Vee — — V -8.0 — -5.0

1. All specifications apply when operated with bias voltages of +5V for Vcc and –5.0V for Vee.

2. This attenuator is guaranteed monotonic.

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

0.05 GHz

0.5 - 2.0 GHz

0.05 GHz

0.5 - 2.0 GHz

dB
dB
dB

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

dBm
dBm

dBm
dBm

dBm
dBm

—
—
—

± 3% of attenuation setting in dB
± 3% of attenuation setting in dB

—
—

—
—

—
—

1.2

1.3

1.5

+20
+28

+38
+48

+44
+68

1.6

1.7

1.9

—
—

—
—

—
—

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

Electrical Specifications: TA = 25°C

Parameter Test Conditions Frequency Units Min Typ Max

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

AT20-0273

V 3.00

— mA — — 2.0

Absolute Maximum Ratings 3

Parameter

Max Input Power

0.5 GHz

0.5 - 2.0 GHz

Supply Voltages

Vcc
Vee

Control Voltage 4 -0.5V to Vcc +0.5V

Operating Temperature -40°C to +125°C

Storage Temperature -65°C to +150°C

3. Operation of this device above any one of these parameters
may cause permanent damage.

4. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.

Absolute Maximum

+27 dBm
+34 dBm

+5.5V

-8.5V

Functional Schematic (Top View) 5

RF1

GND

GND

GND

Vee

Vcc

PIN 16 NC

16 dB

16 dB

NC

RF2

GND

GND

GND

GND

C1

GND Orientation Mark

C2 PIN 1

Truth Table

Control Input

C2 C1 Attenuation

0 0 Reference
0 1 16 dB
1 0 32 dB

0 = TTL Low 1 = TTL High

5. Use the C1 control for a single 16-dB bit.

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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