Voltage Variable Absorptive Attenuator
DC - 2 GHz
Features
q
q
q
q
q
q
q
q
AT-250
V 2.00
SO-8
12 dB Voltage Variable Attenuation
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 SOIC 8 Plastic Package
Tape and Reel Packaging Available
1
Description
M/A-COM鈥檚 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
required. 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
mature 1-micron process. The process features full chip passiva-
tion for increased performance and reliability.
Ordering Information
Part Number
AT-250 PIN
AT-250TR
AT-250RTR
Package
SOIC 8-Lead Plastic Package
Forward Tape & Reel
Reverse Tape & Reel
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
DC 鈥?0.1 GHz
DC 鈥?0.5 GHz
DC 鈥?1.0 GHz
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)
Unit
dB
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
28
40
18
18.5
34
47
31
(3)
36
(3)
Min.
Typ.
2.9
3.0
3.2
3.4
+/鈥?0.1
+/鈥?0.2
+/鈥?0.5
+/鈥?1.2
2.1:1
3
5
10
Max
3.1
3.2
3.5
3.8
+/鈥?0.3
+/鈥?0.4
+/鈥?0.8
+/鈥?1.5
Flatness
(Peak to Peak)
VSWR
Trise, Tfall
Ton, Toff
Transients
Power
Handling
IP2
IP3
13
21
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 typ.
3. For levels above 6 dB attenuation. For levels below 6 dB, the minimum specification numbers apply.
1
2
