MACOM AT-255, AT-255TR Datasheet
3Volt Voltage Variable Attenuator
25 dB, DC - 2 .5 GHz
AT-255
Features
• Single Voltage Control 0 to -3 Volts
• 25 dB Attenuation Range at 0.9 GHz
• Low DC Power Consumption
• Low Cost SOT-25 Plastic Package
• Tape and Reel Packaging Available
Description
M/A-COM’s AT-255 is a GaAs MMIC voltage variable
absorptive attenuator in a low cost SOT-25 surface mount
plastic package. The AT-255 is ideally suited for use where
variable attenuation fine tuning and very low power
consumption are required.
Typical applications include radio, cellular, GPS equipment and
automatic gain/level control circuits.
The AT-255 is fabricated using a mature 1-micron GaAs
MESFET process. The process features full chip passivation for
increased performance and reliability.
Ordering Information
Part Number Package
AT-255 SOT-25 Plastic
AT-255TR Forward Tape and Reel
1. Reference Application Note M513 for reel size information.
1
SOT-25
Note: 1. Leads Coplanarity should be 0.003 (0.08) max.
DIM
INCHES MI LLIMETERS
MIN MAX MIN MAX
A .106 .122 2.70 3.10
B .100 .118 2.54 3.00
C
D .063 REF. 1.60 REF.
E .032 .043 .80 1.10
F .014 .020 .35 .50
G .003
H .000 .006 .00 .15
J .018 REF. .45 REF
.051
.08
1.30
1
Electrical Specifications: TA = +25°C
====
Parameter Test Conditions Units Min. Typ. Max.
Insertion Loss DC - 2.0 GHz dB 3.6 4.2
Attenuation DC - 1.0 GHz dB 23 25
1.0 - 2.0 GHz dB 18 20
Flatness (Peak-to-Peak) DC - 1.0 GHz dB ±7 ±10
1.0 - 2.0 GHz dB ±5 ±8
VSWR DC - 2.0 GHz 3:1
T
, T
rise
fall
Ton, T
off
Transients
1. All measurements at 1 GHz in a 50Ω system unless otherwise specified. Insertion Loss varies 0.003 dB/°C.
Specifications subject to change without notice.
North America: Tel. (800) 366-2266, Fax (800) 618-8883
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+ 44 (1 34 4) 30 0 020
Visit www.macom . com for ad di tional data sheets and pr o d uct i nf orm ation.
10% to 90% RF, 90% to 10% RF nS 10
50% Control to 90% RF, Control to 10% RF nS 20
In-band mV 10
V 4.0
1
INPUT IP3 vs CONTROL VOLTAGE
Q
0
0
3 Volt Voltage Variable Attenuator, 25 dB, DC - 2.5 GHz
AT-255
Absolute Maximum Ratings
1
Parameter Absolute Maximum
Maximum Input Power +21 dBm
Control Voltage V
C
-8V, +0.5V
Operating Temperature -40°C to +85°C
Storage Temperature -65°C to +150°C
1. Exceeding any one or a combination of these limits may cause
permanent damage.
Typical Performance Curves
Relative Attenuation vs. Control Voltage Insertion Loss vs. Frequency
0
-5
-10
-15
-20
-25
ATTENUATION (dB)
-30
-35
-3 -2 -1 0
CONTROL VOLTAGE (VOLTS)
2.5GHz
50MHz
Functional Schematic
5
1
GND
RF
1. VCC = 0 VDC to -3 V
-1
-2
-3
ATTENUATION(dB)
-4
01234
@ 50 µA max.
DC
FREQUENCY(GHz)
1
GNDVc
4
2
3
RF
Maximum Relative Attenuation vs. Frequency
0
-5
-10
-15
-20
-25
ATTENUATION(dB)
-30
-35
00.511.522.53
FREQUENCY (GHz)
Input IP3 vs. Control Voltage
45
40
35
30
25
20
IP3 (dBm)
15
10
5
0
-3 -2 -1 0
Specifications subject to change without notice.
North America: Tel. (800) 366-2266, Fax (800) 618-8883
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+ 44 (1 34 4) 30 0 020
500 MHz
50MHz
CONTROL VOLTAGE (VOLTS)
Return Loss vs. Control @ 900 MHz
-5
-10
-15
-20
RETURN LOSS (dB)
-25
-3 -2 -1 0
Input P1dB vs. Control Voltage
30
25
50MHz
20
500MHz
15
10
5
0
COMPRESSION POINT (dBm)
-3 -2 -1 0
CONTROL VOLTAGE (VOLTS)
CONTROL VOLTAGE (VOLTS)
V 4.0
2
Visit www.macom . com for ad di tional data sheets and pr o d uct i nf orm ation.
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