ALPHA AA220-25 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. 10/99A
Parameter Condition Frequency Min. Typ. Max. Unit
Switching Characteristics
5
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 0.50–2.0 GHz +28 dBm
0.05 GHz +22 dBm
Intermodulation Intercept Point (IP3) For Two-tone Input Power +5 dBm 0.50–2.0 GHz +48 dBm
0.05 GHz +38 dBm
Control Voltages V
Low
= 0 to -0.2 V @ 20 µA Max.
V
High
= -5 V @ 50 µA Typ. to -8 V @ 200 µA Max.
GaAs IC 4 Bit Digital Attenuator
2 dB LSB DC–2 GHz
Features
■ Attenuation in 2 dB Steps to 30 dB
with High Accuracy
■ Low Cost SOIC-16 Plastic Package
■ Low DC Power Consumption
AA220-25
(Previously AD220-25)*
0.158 (4.00 mm)
0.150 (3.80 mm)
0.068
(1.73 mm) MAX.
0.244 (6.20 mm)
0.228 (5.80 mm)
0.049 (1.24 mm)
0.016 (0.41 mm)
0.016 MAX.
(0.41 mm)
x 45˚
CHAMFER
0.020 (0.51 mm)
0.013 (0.33 mm)
0.050
(1.27 mm) BSC
PIN 16
PIN 1
PIN 1
INDICATOR
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)
8˚ MAX.
Description
The AD220-25 is an IC FET digital attenuator consisting
of four monolithic attenuators with LSB of 2 dB and a total
attenuation of 30 dB with all attenuators connected.
The AD220-25 is particularly well 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.
Operating Characteristics at 25°C (0, -5 V)
SOIC-16
Parameter
1
Frequency
2
Min. Typ. Max. Unit
Insertion Loss
3
DC–0.1 GHz 1.2 1.4 dB
DC–0.5 GHz 1.4 1.7 dB
DC–1.0 GHz 1.5 1.8 dB
DC–2.0 GHz 2.0 2.5 dB
Attenuation Range 30 dB
Attenuation Accuracy
4
DC–1.0 GHz ± (0.2 + 3% of dB
Attenuation Setting in dB)
DC–2.0 GHz ± (0.3 + 3% of dB
Attenuation Setting in dB)
VSWR (I/O) DC–1.0 GHz 1.4:1 1.6:1
DC–2.0 GHz 1.6:1 2.0:1
Electrical Specifications at 25°C (0, -5 V)
1. All measurements made in a 50 Ω system, unless otherwise specified.
2. DC = 300 kHz.
3. Insertion loss changes by 0.003 dB/°C.
4. Attenuation referenced to insertion loss.
5. 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”.
GaAs IC 4 Bit Digital Attenuator 2 dB LSB DC–2 GHz AA220-25
2 Alpha Industries, Inc. [781] 935-5150 • Fax [617] 824-4579 • Email sales@alphaind.com • www.alphaind.com
Specifications subject to change without notice. 10/99A
Insertion Loss vs. Frequency
dB
Frequency (GHz)
0 0.5 1.5 2.0
4
3
0
1
2
1
0
0 0.5 1.0 1.5 2.0
8
16
24
32
Frequency (GHz)
dB
Attenuation vs. Frequency
Frequency (GHz)
VSWR vs. Frequency
dB
0
2.0
1.8
1.6
1.4
1.2
1.0
0.5 1.5 2.01
16 dB State
Insertion Loss
4 dB State
30 dB State
8 dB State
2 dB State
Typical Performance Data (0, -5 V)
12 3 4 5 6 7 8
16 15
14
13 12 11 10 9
V
8
16 dB 8 dB 4 dB 2 dB
V7V6V5V4V3V2V
1
J1GND GND GND GND GND GND J
2
Characteristic Value
RF Input Power 2 W > 500 MHz 0/-8 V
0.5 W @ 50 MHz 0/-8 V
Control Voltage +0.2 V, -8 V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C
Absolute Maximum Ratings
Pin Out
Truth Table
Note: Exceeding these parameters may cause irreversible damage.
V1V2V3V4V5V6V7V
8
Attenuation
2 dB 4 dB 8 dB 16 dB
J1–J
2
-5 0 -5 0 -5 0 -5 0 Reference I.L.
0 -5 -5 0 -5 0 -5 0 2 dB
-5 0 0 -5 -5 0 -5 0 4 dB
-50-50 0-5-5 0 8 dB
-5 0 -5 0 -5 0 0 -5 16 dB
0 -5 0 -5 0 -5 0 -5 30 dB
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