MACOM AT-263PIN Datasheet

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

AT-263

CR-12

V 3.00

Features

n Attenuation: 1 dB steps to 31 dB
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 Ohm Nominal Impedance

Description

M/A-COM’s AT-263 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
hermetically sealed ceramic 16-lead surface mount package.
The AT-263 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.

Electrical Specifications1
(From –55°C to +85°C)

Parameter Test Conditions Frequency Units Min Typ Max

Reference Insertion Loss — DC - 0.5 GHz

DC - 1.0 GHz
DC - 2.0 GHz

dB
dB
dB

—
—
—

—
—
—

2.4

2.8

3.0

Attenuation Accuracy 2 Any Single Bit

Any Combination of Bits

DC - 1.0 GHz
DC - 2.0 GHz

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

or ± 0.4 dB, whichever is greater

VSWR — DC - 2.0 GHz Ratio — — 1.6:1

Trise, Tfall 10% to 90% — ns — 9 —

Ton, Toff 50% Control to 90/10% RF — ns — 40 —

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

1 dB Compression Input Power

Input Power

0.05 GHz

0.5 - 2.0 GHz

dBm
dBm — —

+20
+28

—
—

Input IP3 For two-tone Input Power

Up to +5 dBm

0.05 GHz

0.5 - 2.0 GHz

dBm
dBm — —

+40
+48

—
—

Input IP2 For two-tone Input Power

Up to +5 dBm

0.05 GHz

0.5 - 2.0 GHz

dBm
dBm — —

+45
+68

—

—
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.

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

AT-263

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 3.00

2

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

— 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) 0 to 0.8V — µA — — 1.0

Input Leakage Current (High) 2.0 to 5.0V — µA — — 1.0

Electrical Specifications (From –55°C to +85°C)

Absolute Maximum Ratings 3

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.

Parameter

Absolute Maximum

Max Input Power

0.5 GHz

0.5 - 2.0 GHz

+27 dBm
+34 dBm

Supply Voltages

Vcc
Vee

+5.5V

-8.5V

Control Voltage 4 -0.5V to Vcc +0.5V

Operating Temperature -55°C to +125°C

Storage Temperature -65°C to +150°C

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

Functional Schematic (Top View)

C5

+5V

-5V

C4

C3

C2

RF2

GND

GND

GND

GND

16 dB

8 dB

4 dB

2 dB

1 dB

GND

GND Orientation Mark

RF1 PIN 1

C1

PIN 16 GND