
Alpha Industries, Inc. [781] 935-5150
Fax [617] 824-4579 Email sales@alphaind.com www.alphaind.com
1
Specifications subject to change without notice. 12/00A
GaAs IC 5 Bit Digital Attenuator
1 dB LSB DC–2 GHz
Features
s Attenuation 1.0 dB Steps to 31 dB
with High Accuracy
s Low DC Power Consumption
s Low Cost SSOP-20 Plastic Package
SSOP-20
AA260-85
(Previously AD260-85)*
0.012
(0.30 mm)
REF.
0.0256
(0.65 mm)
BSC
0.069
(1.75 mm)
±0.004
(0.10 mm)
0.008 (0.20 mm) MAX.
0.002 (0.05 mm) MIN.
0.010 (0.25 mm)
0.004 (0.090 mm)
8 MAX.
0.030 (0.75 mm)
±0.008 (0.10 mm)
0.078
(2.00 mm)
MAX.
0.283 (7.20 mm)
±0.012 (0.30 mm)
PIN 20
PIN 1
0.209 (5.30 mm)
±0.012 (0.30 mm)
0.307 (7.80 mm)
±0.016 (0.307 mm)
PIN 1
INDICATOR
Description
The AA260-85 is a 5 bit, GaAs IC FET digital attenuator
in a low cost SSOP-20 package. This attenuator has an
LSB of 1 dB and a total attenuation of 31 dB. The
AA260-85 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.
Parameter1
Condition
Frequency2
Min.
Typ.
Max.
Unit
Insertion Loss
DC–0.5 GHz
1.4
1.7
dB
DC–1.0 GHz
1.6
2.0
dB
DC–2.0 GHz
2.0
2.3
dB
Attenuation Range
31
dB
Attenuation Accuracy3
DC–1.0 GHz
± (0.2 + 3% of
Attenuation Setting in dB)
dB
DC–1.8 GHz
± (0.4 + 5% of
Attenuation Setting in dB)
dB
DC–2.0 GHz
± (0.5 + 6% of
Attenuation Setting in dB)
dB
VSWR (I/O)
DC–2.0 GHz
1.4:1
1.7:1
Switching Characteristics4
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
VHigh = -5 V
0.5–2.0 GHz
+25
+29
dBm
0.05 GHz
+18
+22
dBm
Intermodulation Intercept Point (IP3)
For Two-tone Input Power +5 dBm
0.5–2.0 GHz
+42
+48
dBm
VHigh = -5 V
0.05 GHz
+30
+36
dBm
Control Voltages
VLow = 0 to 0.2 V @ 20 A Max.
VHigh = -5 V @ 300 A Max.
Electrical Specifications at -40°C to +85°C (0, -5 V)
1. All measurements made in a 50
system, unless otherwise specified.
2. DC = 300 kHz.
3. Attenuation referenced to insertion loss.
4. 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”.