MACOM AT20-0263 Datasheet

Digital Attenuator, 31 dB, 5-Bit,
TTL Driver, DC - 2 GHz

V 3.00

AT20-0263

Features

n Attenuation: 1 dB steps to 31 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 AT20-0263 is a GaAs FET 5-bit digital
attenuator with a 1 dB minimum step size and 31 dB total
attenuation. This attenuator and integral TTL driver is in a
ceramic 16-lead surface mount package. The AT20-0263 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-263.

CR-12

Electrical Specifications: TA = 25°C1

Parameter Test Conditions Frequency Units Min Typ Max

Reference Insertion Loss — DC - 0.5 GHz

Attenuation Accuracy 2 Any Single Bit

Any Combination of Bits

VSWR — DC - 2.0 GHz Ratio — — 1.6:1

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 - 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

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

dBm
dBm

dBm
dBm

dBm
dBm

—
—
—

or ± 0.4 dB, whichever is greater

—
—

—
—

—
—

2.0

2.2

2.5

+20
+28

+40
+48

+45
+68

2.4

2.8

3.0

—
—

—
—

—
—

Digital Attenuator, 31 dB, 5-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

AT20-0263

V 3.00

— mA — — 5.0

Absolute Maximum Ratings 3

Parameter

Max Input Power

0.5 GHz

0.5 - 2.0 GHz

Supply Voltages

Vcc
Vee

Control Voltage

4

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

-0.5V to Vcc +0.5V

Functional Schematic (Top View)

+5V

-5V

PIN 16 GND

C5

C4

C3

C2

C1

16 dB

8 dB

4 dB

2 dB

1 dB

RF2

GND

GND

GND

GND
GND

GND Orientation Mark

RF1 PIN 1

Truth Table

Control Inputs

C5 C4 C3 C2 C1 Attenuation

0 0 0 0 0 Reference
0 0 0 0 1 1 dB
0 0 0 1 0 2 dB
0 0 1 0 0 4 dB
0 1 0 0 0 8 dB
1 0 0 0 0 16 dB

1 1 1 1 31 dB 1

0 = TTL Low 1 = TTL High

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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