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GaAs IC 4 Bit Digital Attenuator 2 dB LSB DC-2 GHz
AA220-25
(Previously AD220-25)*
Features
I Attenuation in 2 dB Steps to 30 dB with High Accuracy I Low Cost SOIC-16 Plastic Package I Low DC Power Consumption
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 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.
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 25C (0, -5 V)
Parameter1 Insertion Loss3 Frequency2 DC-0.1 DC-0.5 DC-1.0 DC-2.0 GHz GHz GHz GHz Min. Typ. 1.2 1.4 1.5 2.0 30 DC-1.0 GHz DC-2.0 GHz VSWR (I/O) DC-1.0 GHz DC-2.0 GHz (0.2 + 3% of Attenuation Setting in dB) (0.3 + 3% of Attenuation Setting in dB) 1.4:1 1.6:1 1.6:1 2.0:1 Max. 1.4 1.7 1.8 2.5 Unit dB dB dB dB dB dB dB
Attenuation Range Attenuation Accuracy4
Operating Characteristics at 25C (0, -5 V)
Parameter Switching Characteristics5 Condition Rise, Fall (10/90% or 90/10% RF) On, Off (50% CTL to 90/10% RF) Video Feedthru 0.50-2.0 GHz 0.05 GHz For Two-tone Input Power +5 dBm 0.50-2.0 GHz 0.05 GHz Frequency Min. Typ. 15 25 25 +28 +22 +48 +38 Max. Unit ns ns mV dBm dBm dBm dBm
Input Power for 1 dB Compression Intermodulation Intercept Point (IP3) Control Voltages
VLow = 0 to -0.2 V @ 20 A Max. VHigh = -5 V @ 50 A Typ. to -8 V @ 200 A Max.
4. Attenuation referenced to insertion loss. 5. Video feedthru measured with 1 ns risetime pulse and 500 MHz bandwidth.
1. All measurements made in a 50 system, unless otherwise specified. 2. DC = 300 kHz. 3. Insertion loss changes by 0.003 dB/C.
*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. 10/99A
1
GaAs IC 4 Bit Digital Attenuator 2 dB LSB DC-2 GHz
AA220-25
Typical Performance Data (0, -5 V)
4 2.0 16 dB State 3 1.8 2 dB State 1.6
dB
2
dB
4 dB State
1.4 1 1.2 Insertion Loss 0 0 0.5 1 1.5 2.0 1.0 0 0.5 1 1.5 2.0 30 dB State 8 dB State
Frequency (GHz)
Frequency (GHz)
Insertion Loss vs. Frequency
32
VSWR vs. Frequency
Absolute Maximum Ratings
Characteristic Value 2 W > 500 MHz 0/-8 V 0.5 W @ 50 MHz 0/-8 V +0.2 V, -8 V -40C to +85C -65C to +150C RF Input Power Control Voltage Operating Temperature Storage Temperature
24
dB
16
8
Note: Exceeding these parameters may cause irreversible damage.
0 0 0.5 1.0 1.5 2.0
Pin Out
J1 GND GND GND GND GND GND J2
16 15 14 13 12 11 10 9
Frequency (GHz)
Attenuation vs. Frequency
Truth Table
V1 -5 0 -5 -5 -5 0 V2 0 -5 0 0 0 -5 V3 -5 -5 0 -5 -5 0 V4 0 0 -5 0 0 -5 V5 -5 -5 -5 0 -5 0 V6 0 0 0 -5 0 -5 V7 -5 -5 -5 -5 0 0 V8 0 0 0 0 -5 -5 2 dB 4 dB 8 dB 16 dB Attenuation J1-J2 Reference I.L. 2 dB 4 dB 8 dB 16 dB 30 dB
16 dB
8 dB
4 dB
2 dB
1
2
3
4
5
6
7
8
V8
V7
V6
V5
V4
V3
V2
V1
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

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