Voltage Variable Absorptive Attenuator
DC - 2 GHz
Features
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AT-259
V 2.00
SOT-143
Attenuation: 12 dB at 1 GHz
Low Intermodulation Products
Low DC Power Consumption: 50 碌W
Single Voltage Control 0 to -4 Volts
Nanosecond Switching Speed
Temperature Range: -40藲C to + 85藲C
Low Cost SOT/143 Plastic Package
Tape and Reel Packaging Available
1
Description
M/A-COM鈥檚 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 required. Typical applications include radio,
cellular, GPS equipment and other Automatic Gain/Level
Control 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 performance and reliability.
Ordering Information
Part Number
AT-259 PIN
AT-259TR
AT-259RTR
Unit
dB
dB
dB
dB
dB
dB
dB
nS
nS
mV
dBm
dBm
0.05 GHz
0.5 鈥?2.0 GHz
0.05 GHz
0.5 鈥?2.0 GHz
dBm
dBm
dBm
18
18.5
34
47
31
(3)
36
(3)
Package
SOT 4-Lead Plastic Package
Forward Tape & Reel
Reverse Tape & Reel
Min.
Typ.
2.9
3.0
3.2
3.4
鹵 0.2
鹵 2.3
鹵 7.0
2.1:1
3
5
10
Max
3.1
3.2
3.5
3.8
鹵 0.4
鹵 2.5
鹵 7.5
Electrical Specifications, T
A
= +25擄C
Parameter
Insertion Loss
Test Conditions
2
DC 鈥?0.1 GHz
DC 鈥?0.5 GHz
DC 鈥?1.0 GHz
DC 鈥?2.0 GHz
5 dB Attenuation
10 dB Attenuation
15 dB Attenuation
Flatness
(Peak to Peak)
VSWR
Trise, Tfall
Ton, Toff
Transients
Power
Handling
IP2
DC 鈥?2.0 GHz
10% to 90% RF, 90% to 10% RF
50% Control to 90% RF, 50% Control to 10% RF
In Band
Linear Operation
Absolute Max.Input Power
Measured Relative
to Input Power
(For two-tone Input Power Up to +5 dBm)
Measured Relative
to Input Power
(For two-tone Input Power Up to +5 dBm)
13
21
IP3
1. Refer to 鈥淭ape and Reel Packaging鈥漇ection, or contact factory.
2. All measurements at 1 GHz in a 50鈩?system, unless otherwise specified.A control voltage 0 to -4 volts @ 20 碌A(chǔ) typ.
3. For levels above 6 dB attenuation. For levels below 6 dB, the minimum specification numbers apply.
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