GaAs IC 5 Bit Digital Attenuator
0.5 dB LSB DC–2 GHz
AA280-25
(Previously AD280-25)*
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
PIN 16
0.050
(1.27 mm) BSC
PIN 1
INDICATOR
0.244 (6.20 mm)
0.228 (5.80 mm)
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.
PIN 1
0.068
(1.73 mm) MAX.
0.020 (0.51 mm)
0.013 (0.33 mm)
0.049 (1.24 mm)
0.016 (0.41 mm)
0.016 MAX.
(0.41 mm)
x 45˚
CHAMFER
8˚ MAX.
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)
0.158 (4.00 mm)
0.150 (3.80 mm)
Electrical Specifications at -40°C to +85°C (0, -5 V)
Parameter
1
Insertion Loss
3
Condition
Frequency
2
DC–0.5 GHz
DC–1.0 GHz
DC–2.0 GHz
DC–1.0 GHz
DC–2.0 GHz
VSWR
(I/O
)4
Rise, Fall (10/90% or 90%/10% RF)
On, Off (50% CTL to 90%/10% RF)
Video Feedthru
0.5–2.0 GHz
0.05 GHz
For Two-tone Input Power +5 dBm
V
Low
= 0 to 0.2 V @ 20
µA
Max.
V
High
= -5 V @ 300
µA
Max.
4. Input/Output
5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
Min.
Typ.
1.1
1.4
1.7
15.5
Max.
1.3
1.7
2.0
Unit
dB
dB
dB
dB
dB
dB
nS
nS
mV
dBm
dBm
dBm
dBm
Attenuation Range
Attenuation
Accuracy
3
± (0.2 + 3% of
Attenuation Setting in dB)
± (0.4 + 3% of
Attenuation Setting in dB)
1.4:1
15
25
25
+24
+17
+44
+35
+29
+22
+50
+40
1.8:1
DC–2.0 GHz
Switching Characteristics
5
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
0.5–2.0 GHz
0.05 GHz
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
Specifications subject to change without notice. 11/00A
1
ALPHA [ ALPHA INDUSTRIES ]
