Digital Attenuator, 1 Bit, 10 dB Step
DC - 2.0 GHz
Features
•
Single 10 dB Step
•
Low Loss: 0.3 dB @ 900 MHz
•
Low Cost SOT-25 Package
AT-266
V4
Functional Block Diagram
Description
M/A-COM’s AT-266 is a 1 bit, 10 dB step GaAs
MMIC digital attenuator in a low cost SOT-25
surface mount plastic package. The AT-266 is
ideally suited for use where high accuracy, very low
power consumption and low intermodulation
products are required. Typical applications include
radio, wireless LANs, GPS equipment and other
gain/level control circuits.
The AT-266 is fabricated using a mature GaAs
MMIC process featuring full chip passivation for
increased performance and reliability.
Pin Configuration
Pin No.
Function
RF1
GND
RF2
V1
V2
Description
RF In/Out
RF Ground
RF In/Out
Control Voltage
Control Voltage
Ordering Information
Part Number
AT-266
AT-266TR
1
2
Package
Bulk Packaging
1000 piece reel
3
4
5
Note: Reference Application Note M513 for reel size
information.
Truth Table
3,4,5
V1
V2
1
0
Attenuation State
10 dB
Insertion Loss
Absolute Maximum Ratings
1,2
Parameter
Input Power
50 MHz
500 - 2000 MHz
Control Voltage
Operating Temperature
Storing Temperature
0
1
Absolute Maximum
+27 dBm
+34 dBm
-8.5 V < Vc < +8 V
-40°C to +85°C
-65°C to +150°C
3. For positive voltage control, external DC blocking capacitors
are required on all RF ports (pins 1, 2 and 3).
4. Differential voltage, V(state 1) - V(state 0), must be +2.8 V
minimum and less than 8 V.
5. 0 = -8 V to 0.2 V, 1 = -0.2 V to 8 V
1. Exceeding any one or combination of these limits may cause
permanent damage to this device.
2. M/A-COM does not recommend sustained operation near
these survivability limits.
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.
Digital Attenuator, 1 Bit, 10 dB Step
DC - 2.0 GHz
Electrical Specifications: T
A
= 25°C, V
C
= 0 V / -3 V, Z
0
= 50
Ω
Parameter
Insertion Loss
Attenuation
VSWR
IP
3
P1dB
Trise, Tfall
Ton, Toff
Transients
Control Current
AT-266
V4
Test Conditions
0 - 1 GHz
1 - 2 GHz
DC - 1 GHz
1 - 2 GHz
0 - 2 GHz
2 Tone @ 0 dBm, 5 MHz spacing
1 GHz
10% to 90% RF, 90% to 10% RF
50% Control to 90% RF, 50% Control to 10% RF
In Band
│Vc│
= 3 V
Units
dB
dB
dB
dB
Ratio
dBm
dBm
nS
nS
mV
µA
Min.
—
—
9.6
9.5
—
42
23
—
—
—
—
Typ.
0.3
0.5
10
10
1.4:1
50
28
5
10
6
25
Max.
0.45
0.7
10.4
10.5
1.5:1
—
—
20
25
10
—
SOT-25 Plastic Package
Handling Procedures
Please observe the following precautions to avoid
damage:
Static Sensitivity
Gallium Arsenide Integrated Circuits are sensitive
to electrostatic discharge (ESD) and can be
damaged by static electricity. Proper ESD control
techniques should be used when handling these
devices.
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.
Digital Attenuator, 1 Bit, 10 dB Step
DC - 2.0 GHz
Typical Performance Curves (39 pF capacitors used for positive voltage control)
Insertion Loss (Positive Control)
1.0
+25°C
-40°C
+85°C
AT-266
V4
Insertion Loss (Negative Control)
1.0
0.8
0.8
+25°C
-40°C
+85°C
0.6
0.6
0.4
0.4
0.2
0.2
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
Frequency (GHz)
Relative Attenuation (Positive Control)
11.0
+25°C
-40°C
+85°C
Relative Attenuation (Negative Control)
11.0
+25°C
-40°C
+85°C
10.5
10.5
10.0
10.0
9.5
9.5
9.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
9.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
Frequency (GHz)
Return Loss (Reference State)
40
Positive Control
Negative Control
Return Loss (10 dB State)
40
Positive Control
Negative Control
30
30
20
20
10
10
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
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.
Frequency (GHz)
•
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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