MACOM AT-233PIN Datasheet

Digital Attenuator, 30 dB, 4-Bit,
TTL Driver, DC - 2 GHz

AT-233

CR-12

V 3.00

Features

n Attenuation: 2 dB Steps to 30 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 Ohm Nominal Impedance

Description

M/A-COM’s AT-233 is a GaAs FET 4-Bit digital
attenuator with a 2 dB minimum step size and 30 dB total
attenuation. This attenuator and integral TTL driver is in a
hermetically sealed ceramic 16-lead surface mount package.
The AT-233 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 Specifications: TA = 25°C1

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

—
—
—

—
—
—

2.3

2.65

2.8

Attenuation Accuracy

3

Any Single Bit

Any Combination of Bits

DC - 1.0 GHz
DC - 2.0 GHz

DC - 1.0 GHz
DC - 2.0 GHz

± (0.2 + 3% of attenuation setting in dB) dB
± (0.2 + 3% of attenuation setting in dB) dB

or ± 0.45 dB, whichever is greater
± (0.20 + 3% of attenuation setting in dB) dB
± (0.25 + 4% of attenuation setting in dB) dB

or ± 0.45 dB, whichever is greater

VSWR DC - 2.0 GHz Ratio — — 1.7:1

Trise, Tfall 10% to 90% — ns — 10 —

Ton, Toff 50% Control to 90/10% RF — ns — 30 —

Transients In-Band (peak-peak) — mV — 35 —

1 dB Compression

4

Input Power 0.05 GHz

0.5 - 2.0 GHz

dBm
dBm

—
—

+20
+28

—
—

Input IP3 4 For two tone input power

Up to +5 dBm

0.05 GHz

0.5 - 2.0 GHz

dBm
dBm

—
—

+40
+50

—
—

Input IP2 4 For two-tone input power

Up to +5 dBm

0.05 GHz

0.5 - 2.0 GHz

dBm
dBm

—
—

+45
+68

—
—

1. All specifications apply when operated with bias voltages of +5V or VCC and –5.0V to –8.0V for VEE, and 50 Ohm impedance at
all ports unless otherwise specified.

2. Above reference insertion loss.

3. This attenuator is guaranteed monotonic.

4. VEE = -5V for the typical numbers given.

Digital Attenuator, 30 dB, 4-Bit, TTL Driver, DC - 2 GHz

AT-233

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

Functional Schematic (Top View)

Absolute Maximum Ratings 5

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

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 -0.5V to VCC + 0.5V

Operating Temperature -55°C to +125°C

Storage Temperature -65°C to +150°C

Parameter Test Conditions Frequency Units Min Typ Max

VCC — V 4.5 5.0 5.5
VEE — V -8.0 — -5.0

ICC VCC = 4.5 to 5.5 V

Vctl = 0 to 0.8V, or VCC –2.1V to VCC

— mA — — 4.0

IEE VEE = -5.0 to –8.0V — mA — — 1.0

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

Electrical Specifications: TA = 25°C1

Truth Table

C4 C3 C2 C1 Attenuation

0 0 0 0 Reference
0 0 0 1 2 dB
0 0 1 0 4 dB
0 1 0 0 8 dB
1 0 0 0 16 dB
1 1 1 1 30 dB

Control Inputs

0 = TTL Low 1 = TTL High

NC

+5V

-5V

C4

C3

C2

C1

GND

RF2

GND

GND

GND

GND

GND

GND

RF1

PIN 1PIN 16

16 dB

8 dB

4 dB

2 dB