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 25°C (0, -5 V)
Parameter
1
Insertion Loss
3
Frequency
2
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 Accuracy
4
Operating Characteristics at 25°C (0, -5 V)
Parameter
Switching Characteristics
5
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
V
Low
= 0 to -0.2 V @ 20 µA Max.
V
High
= -5 V @ 50 µA Typ. to -8 V @ 200 µA 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
Ω
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
ALPHA [ ALPHA INDUSTRIES ]
