V 2.00
Features
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Attenuation: 12 dB at 1 GHz
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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 SOT/143 Plastic Package
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Tape and Reel Packaging Available
1
Description
M/A-COM's AT-259 is a GaAs MMIC voltage variable absorp-
tive attenuator in a low cost SOT/143 4-Lead surface mount
plastic package. The AT-259 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,
c e l l u l a r, GPS equipment and other Automatic Gain/Level
C o n t rol circuits.
The AT-259 is fabricated with a monolithic GaAs MMIC using
a mature 1 micron process. The process features full chip pas-
sivation for increased perf o rmance and reliability.
Vo l t age Va r i a ble Absorptive Attenuator
DC - 2 GHz
AT- 2 5 9
SOT-143
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 2.0 GHz
5 dB Attenuation
dB
0.2
0.4
(Peak to Peak)
10 dB Attenuation
dB
2.3
2.5
15 dB Attenuation
dB
7.0
7.5
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
34
IP2
to Input Power
0.5 2.0 GHz
dBm
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-259 PIN
SOT 4-Lead Plastic Package
AT-259TR
Forward Tape & Reel
AT-259RTR
Reverse Tape & Reel
V 2.00
Voltage Variable Absorptive Attenuator
AT-259
4
3
1
2
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 per-
manent 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
GND
2
A
3
RF2
4
RF1
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