3 Volt Voltage Variable Attenuator 25 dB, DC-2.5 GHz
Features
• • • • • Single Voltage Control: 0 to -3 Volts 25 dB Attenuation Range at 0.9 GHz Low DC Power Consumption SOT-25 Plastic Package Tape and Reel Packaging Available
AT-255 V7
Functional Schematic 1
Vc 5 GND 4
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.
1 RF
2 GND
3 RF
1. VC = -3 V to 0 V @ 25 µA maximum.
Pin Configuration
Pin No.
1 2
Function
RF Port Ground RF Port
Pin No.
4 5
Function
Ground VC
Ordering Information
Part Number AT-255 AT-255TR Package SOT-25 Plastic 1000 piece reel
3
Absolute Maximum Ratings 2
Parameter
Input Power Control Voltage VC Operating Temperature Storage Temperature Absolute Maximum +21 dBm -8 V to +0.5 V -40°C to +85°C -65°C to +150°C
Note: Reference Application Note M513 for reel size information.
2. Exceeding any one or combination of these limits may cause permanent damage to this device.
1
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information.
3 Volt Voltage Variable Attenuator 25 dB, DC-2.5 GHz
Electrical Specifications: TA = 25°C, Z0 = 50 Ω
Parameter
Insertion Loss Attenuation Flatness (Peak-to-Peak) VSWR Trise, Tfall Ton, Toff Transients 3. Insertion loss varies 0.003 dB/°C.
3
AT-255 V7
Test Conditions
DC—2.0 GHz DC—1.0 GHz 1.0—2.0 GHz 0.5—1.0 GHz 1.0—2.0 GHz DC—2.0 GHz 10% to 90% RF, 90% to 10% RF 50% Control to 90% RF, 50% Control to 10% RF In Band
Units
dB dB dB dB dB Ratio nS nS mV
Min
— 23 18 — — — — —
Typ
3.6 25 20 +7 +5 3:1 10 20 10
Max
4.2 — — + 10 +8 — — — —
SOT-25
2
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information.
3 Volt Voltage Variable Attenuator 25 dB, DC-2.5 GHz
Typical Performance Curves
Relative Attenuation vs. Control Voltage
50MHz 35 1.0GHz 2.5GHz
AT-255 V7
Insertion Loss vs. Frequency
+25C 4 +85C -40C
Insertion Loss (dB)
30
Attenuation (dB)
25 20 15 10 5 0 -3.0
3
2
1
0
-2.5 -2.0 -1.5 -1.0 -0.5 0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Control Voltage (V)
Frequency (GHz)
Maximum Relative Attenuation vs. Frequency
+25C 35 30 +85C -40C
Return Loss vs. Control Voltage @ 900 MHz
S11 0 -5 -10 -15 -20 -25 -3.0 S22
Attenuation (dB)
25 20 15 10 5 0 0.0 0.5 1.0 1.5 2.0 2.5 3.0
S11, S22 (dB)
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
Frequency (GHz)
Control Voltage (V)
Input IP3 vs. Control Voltage
50MHz 30 500MHz
35
Input P1dB vs. Control Voltage
50MHz 500MHz
Compression Point (dBm)
-2.5 -2.0 -1.5 -1.0 -0.5 0.0
25
30 25 20 15 10 5 0 -3.0
IP3 (dBm)
20 15 10 5 0 -3.0
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
Control Voltage (V)
3
M/A-COM Inc. and its affiliates reserve the right to make changes to the product(s) or information contained herein without notice. M/A-COM makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does M/A-COM assume any liability whatsoever arising out of the use or application of any product(s) or information.
Control Voltage (V)
• North America Tel: 800.366.2266 / Fax: 978.366.2266 • Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300 • Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298 Visit www.macom.com for additional data sheets and product information.
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