GaAs IC 5 Bit Digital Attenuator
0.5 dB LSB DC–2 GHz
AA280-25
(Previously AD280-25)*
Features
SOIC-16
ꢀ Attenuation 0.5 dB Steps to 15.5 dB
with High Accuracy
0.050
(1.27 mm) BSC
PIN 16
ꢀ Low DC Power Consumption
0.244 (6.20 mm)
0.228 (5.80 mm)
PIN 1
INDICATOR
ꢀ Low Cost SOIC-16 Plastic Package
PIN 1
0.020 (0.51 mm)
0.013 (0.33 mm)
Description
0.016 MAX.
(0.41 mm)
x 45˚
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.
0.068
(1.73 mm) MAX.
0.049 (1.24 mm)
0.016 (0.41 mm)
CHAMFER
8˚ MAX.
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.
0.394 (10.00 mm)
0.386 (9.80 mm)
0.158 (4.00 mm)
0.150 (3.80 mm)
0.010 (0.25 mm)
0.004 (0.10 mm)
0.0098 (0.25 mm)
0.0075 (0.19 mm)
Electrical Specifications at -40°C to +85°C (0, -5 V)
1
2
Parameter
Condition
Frequency
Min.
Typ.
Max.
Unit
3
Insertion Loss
DC–0.5 GHz
DC–1.0 GHz
DC–2.0 GHz
1.1
1.4
1.7
1.3
1.7
2.0
dB
dB
dB
Attenuation Range
15.5
dB
3
Attenuation Accuracy
DC–1.0 GHz
DC–2.0 GHz
(0.2 ꢀ 3ꢁ of
Attenuation Setting in dB)
(0.4 ꢀ 3ꢁ of
dB
dB
Attenuation Setting in dB)
)4
VSWR (I/O
DC–2.0 GHz
1.4:1
1.8:1
5
Switching Characteristics
Rise, Fall (10/90ꢁ or 90ꢁ/10ꢁ RF)
On, Off (50ꢁ CTL to 90ꢁ/10ꢁ RF)
Video Feedthru
15
25
25
nS
nS
mV
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
0.5–2.0 GHz
0.05 GHz
ꢀ24
ꢀ17
ꢀ29
ꢀ22
dBm
dBm
For Two-tone Input Power ꢀ5 dBm
0.5–2.0 GHz
0.05 GHz
ꢀ44
ꢀ35
ꢀ50
ꢀ40
dBm
dBm
V
V
= 0 to 0.2 V @ 20 µA Max.
= -5 V @ 300 µA Max.
Low
High
4. Input/Output
5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. DC = 300 kHz.
3. Attenuation referenced to insertion loss.
*Due to conflict with another company’s product numbering system, Alpha’s attenuator products starting with the letters “AD” are being changed to “AA”.
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