Voltage Variable Absorptive Attenuator
35 dB, 0.5-2.0 GHz
AT-109
V5
Functional Schematic 1,2,3
Features
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Single Positive Voltage Control: 0 to +5 Volts
35 dB Attenuation Range at 0.9 GHz
± 2 dB Linearity from BSL
8
7
6
5
Low DC Power Consumption
Temperature Range: -40°C to +85°C
SOIC-8 Plastic Package
Tape and Reel Packaging Available
Description
M/A-COM’s AT-109 is a GaAs MMIC voltage
variable absorptive attenuator in a low-cost SOIC-8
lead surface mount plastic package. The AT-109 is
more linear than the higher attenuation range AT-
108.
The AT-109 is ideally suited for use where linear
attenuation fine tuning and very low power
consumption are required. Typical applications
include radio, cellular, GPS equipment and
automatic gain/level control circuits.
1
2
3
4
1. VCC = +5 VDC ± 0.5 VDC @ 50 µA maximum.
2. VC = 0 VDC to +5 VDC @ 50 µA maximum.
3. External DC blocking capacitors are required on all RF ports.
The AT-109 is fabricated with a monolithic GaAs
MMIC using a mature 1-micron process. The
process features full chip passivation for increased
performance and reliability.
Pin Configuration
Pin No.
Function
Ground
Ground
RF Port
VCC
Pin No.
Function
VC
1
2
3
4
5
6
7
8
Ground
RF Port
Ground
Ordering Information
Part Number
Package
AT-109
SOIC 8-Lead Plastic Package
Absolute Maximum Ratings 4,5
AT-109TR
Forward Tape and Reel
Sample Test Board
Parameter
Input Power
Absolute Maximum
+21 dBm
AT-109SMB
Note: Reference Application Note M513 for reel size
information.
Supply Voltage VCC
Control Voltage VC
Operating Temperature
Storage Temperature
-1 V < VCC < +8 V
-1 V < VC < VCC + 0.5 V
-40°C to +85°C
-65°C to +150°C
4. Exceeding any one or combination of these limits may cause
permanent damage to this device.
5. 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.