Voltage Variable Absorptive Attenuator
12 dB, DC-2.0 GHz
Features
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AT-250
V4
Functional Schematic
12 dB Voltage Variable Attenuation
Low Intermodulation Products
Low DC Power Consumption: 50 µW
Single Voltage Control: 0 to -4 Volts
Nanosecond Switching Speed
Temperature Range: -40°C to +85°C
SOIC-8 Plastic Package
Tape and Reel Packaging Available
RF2
GND
GND
GND
8
7
6
5
1
2
3
4
RF1
GND
GND
VC
Description
M/A-COM’s AT-250 is a GaAs MMIC voltage
variable absorptive attenuator in a low cost SOIC 8lead surface mount plastic package. The AT-250 is
ideally suited for use where attenuation fine tuning,
fast switching and very low power consumption are
required.
Typical applications include radio, cellular, GPS
equipment and other automatic gain/level control
circuits.
The AT-250 is fabricated with a monolithic GaAs
MMIC using a mature 1-micron process. The
process features full chip passivation for increased
performance and reliability.
Pin Configuration
SOIC 8-Lead Plastic Package
AT-250TR
Forward Tape and Reel
Function
1
RF1
5
Ground
2
Ground
6
Ground
Ground
7
Ground
VC
8
RF2
Package
AT-250
Pin No.
4
Part Number
Function
3
Ordering Information
Pin No.
Absolute Maximum Ratings 1
Parameter
Absolute Maximum
Input Power
+21 dBm
Control Voltage
+5V, -8.5V
Operating Temperature
-40°C to +85°C
Storing Temperature
Note: Reference Application Note M513 for reel size
information.
-65°C to +150°C
1. Exceeding any one or combination of these limits may cause
permanent damage to this device.
1
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
Voltage Variable Absorptive Attenuator
12 dB, DC-2.0 GHz
AT-250
V4
Typical Performance Curves
Insertion Loss vs. Frequency
Attenuation vs. Frequency
4
20
Atten5
Atten10
Atten15
3
15
+25°C
-40°C
+85°C
2
10
1
5
0
0.0
0.5
1.0
1.5
2.0
0
0.0
0.5
Frequency (GHz)
1.0
1.5
2.0
Frequency (GHz)
VSWR vs. Frequency
Attenuation vs. Control Voltage, F = 950 MHz
2.0
15
1.8
10
1.6
0 dB
12 dB
5 dB
1.4
5
1.2
1.0
0.0
0.5
1.0
1.5
2.0
Frequency (GHz)
0
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
Control Voltage (V)
Phase vs. Control Voltage, F = 950 MHz
30
20
10
0
-3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
Control Voltage (V)
3
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
