V 2.00
Features
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12 dB Voltage Variable Attenuation
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Low Intermodulation Products
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Low DC Power Consumption: 50 W
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Single Voltage Control 0 to -4 Volts
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Nanosecond Switching Speed
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Temperature Range: -40C to +85C
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Low Cost SOIC 8 Plastic Package
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Tape and Reel Packaging Available
1
Description
M/A-COM's AT-250 is a GaAs MMIC voltage variable absorptive
attenuator in a low cost SOIC 8-lead surface mount plastic pack-
age. The AT-250 is ideally suited for use where attenuation fine
tuning, fast switching and very low power consumption are
re q u i red. Typical applications include radio, cellular, GPS equip-
ment and other Automatic Gain/Level Control circuits.
The AT-250 is fabricated with a monolithic GaAs MMIC using a
m a t u re 1-micron process. The process features full chip passiva-
tion for increased perf o rmance and reliability.
Vo l t age Va r i a ble Absorptive Attenuator
DC - 2 GHz
AT- 2 5 0
S O - 8
Parameter
Test Conditions
2
Unit
Min.
Typ.
Max
Insertion Loss
DC 0.1 GHz
dB
2.9
3.1
DC 0.5 GHz
dB
3.0
3.2
DC 1.0 GHz
dB
3.2
3.5
DC 2.0 GHz
dB
3.4
3.8
Flatness
DC 0.1 GHz
dB
+/ 0.1
+/ 0.3
(Peak to Peak)
DC 0.5 GHz
dB
+/ 0.2
+/ 0.4
DC 1.0 GHz
dB
+/ 0.5
+/ 0.8
DC 2.0 GHz
dB
+/ 1.2
+/ 1.5
VSWR
2.1:1
Trise, Tfall
10% to 90% RF, 90% to 10% RF
nS
3
Ton, Toff
50% Control to 90% RF, 50% Control to 10% RF
nS
5
Transients
In Band
mV
10
Power
Linear Operation
dBm
13
Handling
Absolute Max Input Power
dBm
21
Measured Relative
0.05 GHz
28
34
IP2
to Input Power
0.5 2.0 GHz
dBm
40
47
(For two-tone Input Power Up to +5 dBm)
Measured Relative
0.05 GHz
dBm
18
31
(3)
IP3
to Input Power
0.5 2.0 GHz
dBm
18.5
36
(3)
(For two-tone Input Power Up to +5 dBm)
Electrical Specifications, T
A
= +25C
1. Refer to "Tape and Reel Packaging"Section, or contact factory.
2.All measurements at 1 GHz in a 50
system, unless otherwise specified.A control voltage 0 to -4 volts @ 20 A typ.
3. For levels above 6 dB attenuation. For levels below 6 dB, the minimum specification numbers apply.
Ordering Information
Part Number
Package
AT-250 PIN
SOIC 8-Lead Plastic Package
AT-250TR
Forward Tape & Reel
AT-250RTR
Reverse Tape & Reel
V 2.00
Voltage Variable Absorptive Attenuator
AT-250
Functional Sch e m a t i c
Absolute Maximum Ratings
1
1.Operation of this device above any one of these parameters
may cause permanent damage.
Parameter
Absolute Maximum
Max. Input Power
+21 dBm
Control Voltage
+5 V, -8.5 V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
Pin Configuration
Typical Pe r fo r m a n c e
Pin No.
Description
1
RF1
2
GND
3
GND
4
A
5
GND
6
GND
7
GND
8
RF2
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