ALPHA AA260-85 Datasheet
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
■ Attenuation 1.0 dB Steps to 31 dB
with High Accuracy
■ Low DC Power Consumption
■ Low Cost SSOP-20 Plastic Package
SSOP-20
AA260-85
(Previously AD260-85)*
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.
Parameter
1
Condition Frequency
2
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 Accuracy
3
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 Characteristics
4
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 V
High
= -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
V
High
= -5 V 0.05 GHz +30 +36 dBm
Control Voltages V
Low
= 0 to 0.2 V @ 20 µA Max.
V
High
= -5 V @ 300 µA Max.
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.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”.
±0.012 (0.30 mm)
PIN 20
0.209 (5.30 mm)
0.307 (7.80 mm)
±0.016 (0.307 mm)
(1.75 mm)
(0.10 mm)
0.069
±0.004
(0.30 mm)
PIN 1
INDICATOR
0.0256
(0.65 mm)
BSC
0.012
REF.
PIN 1
0.283 (7.20 mm)
±0.012 (0.30 mm)
0.078
(2.00 mm)
MAX.
0.008 (0.20 mm) MAX.
0.002 (0.05 mm) MIN.
0.010 (0.25 mm)
0.004 (0.090 mm)
0.030 (0.75 mm)
±0.008 (0.10 mm)
8˚ MAX.
2 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com
Specifications subject to change without notice. 12/00A
GaAs IC 5 Bit Digital Attenuator 1 dB LSB DC–2 GHz AA260-85
Insertion Loss (dB)
Frequency (GHz)
Insertion Loss vs. Frequency
0 0.5 1.0 1.5 2.0
-2.0
-1.8
-1.6
-1.4
-1.2
-1.0
+25˚C
+85˚C
-40˚C
IP3 (dBm)
Attenuation (dB)
IP3 vs. Attenuation and
Temperature (500 MHz)
44
46
48
50
52
54
56
58
60
+25˚C
+85˚C
-40˚C
0 2 4 6 8 1012141618202224262830
VSWR
Frequency (GHz)
VSWR vs. Frequency (25˚C)
1.00
1.25
1.50
1.75
2.00
0 0.5 1.0 1.5 2.0
Ins. Loss
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
VSWR
Frequency (GHz)
VSWR vs. Frequency (85˚C)
1.00
1.25
1.50
1.75
2.00
0 0.5 1.0 1.5 2.0
Ins. Loss
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
VSWR
Frequency (GHz)
VSWR vs. Frequency (-40˚C)
1.00
1.25
1.50
1.75
2.00
0 0.5 1.0 1.5 2.0
Ins. Loss
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
Typical Performance Data (0, -5 V)
Compression Point vs. Attenuation,
Voltage, and Temperature
Attenuation Control
Input Power @ 1 dB Compression
State Voltage (V)+25°C (dBm) +85°C (dBm) -40°C (dBm)
Ins. Loss -5 29.6 29.4 29.9
1 dB -5 30.1 29.8 30.5
2 dB -5 29.5 29.4 29.6
4 dB -5 34.0 32.7 32.9
8 dB -5 29.5 29.3 29.8
16 dB -5 28.6 28.6 28.3
31 dB -5 32.1 31.6 31.3
Frequency = 0.5–2.0 GHz
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