Features
 Single 15 dB Step
 Low Loss, 0.3 dB Typical @ 900 MHz
 2.7 to 5.0 Volt Operation
 Insertion Loss, Attenuation insensitive to Control
Voltage
 Low Cost SOT-25 Plastic Package
 Tape and Reel Packaging Available

Description
M/A-COM’s AT-267 is a 1 bit, 15 dB step GaAs MMIC
digital attenuator in a low cost SOT-25 5 lead surface
mount plastic package. The AT-267 is ideally suited for
use where high accuracy, very low power consumption and
low intermodulation products are required.

Typical applications include wireless handsets, base
stations, wireless LAN equipment, GPS receivers and any
RF applications with automatic gain/level control circuits.

The AT-267 is fabricated as a monolithic GaAs integrated
circuit using a proven self-aligned gate process. The
process features full chip passivation for performance and
reliability.
Digital Attenuator, 1 Bit, 15 dB Step
DC - 2.0 GHz
A
T
-267

Functional Schematic
RF1
RF2
V1V2
GND
PIN 5
PIN 1
Positive Control Voltage
Parameter Absolute Maximum
Maximum Input Power +21 dBm
Control Voltage V
CTL
-8 V
Operating Temperature -40° C to +85° C
Storage Temperature -65° C to +150° C
Absolute Maximum Ratings
1
1. Exceeding any one or a combination of these limits may
cause permanent damage.
Mode
(Control)
V1 V2 Atten
Positive
1
0 ± 0.2 V
+2.5 V to +5 V
+2.5 V to +5 V
0 ± 0.2 V
15 dB
IL
Postitive/
Negative
1,2
-Vc ± 0.2 V
+Vc
+Vc
-Vc ± 0.2 V
15 dB
IL
Negative
3
0 ± 0.2 V
-2.5 V to -5 V
-2.5 V to -5 V
0 ± 0.2 V
IL
15 dB
Truth Table
1, 2, 3

1. External DC blocking capacitors are required as noted*
2. |-Vc|+ Vc  8 V
3. If negative control is used, DC blocking capacitors are not
required on RF Ports and Ground.
V 2.00
V2
V1

39 pF
39 pF
39 pF
RF2 GND RF1
5 4
1 2 3