Alpha Industries, Inc. [781] 935-5150

• Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com

1

Specifications subject to change without notice. 11/00A

GaAs IC 5 Bit Digital Attenuator

0.5 dB LSB DC–2 GHz

Features

I Attenuation 0.5 dB Steps to 15.5 dB

with High Accuracy

I Low DC Power Consumption

I Low Cost SOIC-16 Plastic Package

SOIC-16

AA280-25

(Previously AD280-25)*

0.158 (4.00 mm)

0.150 (3.80 mm)

0.068

(1.73 mm) MAX.

0.244 (6.20 mm)

0.228 (5.80 mm)

0.049 (1.24 mm)

0.016 (0.41 mm)

0.016 MAX.

(0.41 mm)

x 45˚

CHAMFER

0.020 (0.51 mm)

0.013 (0.33 mm)

0.050

(1.27 mm) BSC

PIN 16

PIN 1

PIN 1

INDICATOR

0.394 (10.00 mm)

0.386 (9.80 mm)

0.010 (0.25 mm)

0.004 (0.10 mm)

0.0098 (0.25 mm)

0.0075 (0.19 mm)

8˚ MAX.

Description

The AD280-25 is a 5 bit, GaAs IC FET digital attenuator

in a low cost SOIC-16 package. This attenuator has an

LSB of 0.5 dB and a total attenuation of 15.5 dB.

The AD280-25 is particularly suited where high

attenuation accuracy, low insertion loss and low

intermodulation products are required. Typical applications

include cellular radio, wireless data, wireless local loop and

other gain level control circuits.

Condition

Min.

Typ.

Max.

Unit

DC–0.5 GHz

1.1

1.3

dB

DC–1.0 GHz

1.4

1.7

dB

DC–2.0 GHz

1.7

2.0

dB

Attenuation Range

15.5

dB

DC–1.0 GHz

± (0.2 + 3% of

Attenuation Setting in dB)

dB

DC–2.0 GHz

± (0.4 + 3% of

Attenuation Setting in dB)

dB

DC–2.0 GHz

1.4:1

1.8:1

Rise, Fall (10/90% or 90%/10% RF)

15

nS

On, Off (50% CTL to 90%/10% RF)

25

nS

Video Feedthru

25

mV

Input Power for 1 dB Compression

0.5–2.0 GHz

+24

+29

dBm

0.05 GHz

+17

+22

dBm

Intermodulation Intercept Point (IP3)

For Two-tone Input Power +5 dBm

0.5–2.0 GHz

+44

+50

dBm

0.05 GHz

+35

+40

dBm

Control Voltages

Electrical Specifications at -40°C to +85°C (0, -5 V)

1. All measurements made in a 50

Ω system, unless otherwise specified.

2. DC = 300 kHz.

3. Attenuation referenced to insertion loss.

4. Input/Output

5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.

*Due to conflict with another company’s product numbering system, Alpha’s attenuator products starting with the letters “AD” are being changed to “AA”.