GaAs IC 5 Bit Digital Attenuator
0.5 dB LSB DC鈥? 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藲
CHAMFER
8藲 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擄C to +85擄C (0, -5 V)
Parameter
1
Insertion Loss
3
Condition
Frequency
2
DC鈥?.5 GHz
DC鈥?.0 GHz
DC鈥?.0 GHz
DC鈥?.0 GHz
DC鈥?.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鈥?.0 GHz
0.05 GHz
For Two-tone Input Power +5 dBm
V
Low
= 0 to 0.2 V @ 20
碌A(chǔ)
Max.
V
High
= -5 V @ 300
碌A(chǔ)
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
鹵 (0.2 + 3% of
Attenuation Setting in dB)
鹵 (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鈥?.0 GHz
Switching Characteristics
5
Input Power for 1 dB Compression
Intermodulation Intercept Point (IP3)
Control Voltages
0.5鈥?.0 GHz
0.05 GHz
1. All measurements made in a 50
鈩?/div>
system, unless otherwise specified.
2. DC = 300 kHz.
3. Attenuation referenced to insertion loss.
*Due to conflict with another company鈥檚 product numbering system, Alpha鈥檚 attenuator products starting with the letters 鈥淎D鈥?are being changed to 鈥淎A鈥?
Alpha Industries, Inc.
[781] 935-5150
鈥?/div>
Fax
[617] 824-4579
鈥?/div>
Email
sales@alphaind.com
鈥?/div>
www.alphaind.com
Specifications subject to change without notice. 11/00A
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2
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