MACOM AT-267TR-3000, AT-267TR, AT-267SMB Datasheet
Digital Attenuator, 1 Bit, 15 dB Step
V1V
V 2.00
DC - 2.0 GHz
AT-267
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 con sumption 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.
Truth Table
Positive
Postitive/
Negative
Negative
Mode
(Control)
1
1,2
3
1, 2, 3
V1 V2 Atten
0 ± 0.2 V
+2.5 V to +5 V
-Vc ± 0.2 V
+Vc
0 ± 0.2 V
-2.5 V to -5 V
+2.5 V to +5 V
0 ± 0.2 V
+Vc
-Vc ± 0.2 V
-2.5 V to -5 V
0 ± 0.2 V
15 dB
IL
15 dB
IL
IL
15 dB
Functional Schematic
2
PIN 5
PIN 1
RF1
Positive Control Voltage
39 pF
GND
V2
5 4
1 2 3
39 pF
RF1
GND
V1
RF2
RF2
39 pF
1. External DC blocking capacitors are required as noted*
2. |-Vc|+ Vc
3. If negative control is used, DC blocking capacitors are not
required on RF Ports and Ground.
Absolute Maximum Ratings
Maximum Input Power +21 dBm
Control Voltage V
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.
8 V
1
Parameter Absolute Maximum
CTL
-8 V
Digital Attenuator, 1 Bit, 15 dB Step, DC - 2.0 MHz
Electrical Specifications: TA = +25 °C, V
Parameter Test Conditions Units Min. Typ. Max.
Insertion Loss 1.0 GHz dB 0.3 0.4
2.0 GHz dB 0.4 0.5
Attenuation 1.0 GHz dB 15 15.5 16
2.0 GHz dB 14 14.5 15
V
1.0 GHz 1.2:1
SWR
2.0 GHz 1.3:1
Input IP3 1.0 GHz (0 dBm), Attenuator OFF dBm 40 43
Attenuator ON 40 45
P
1 GHz, Attenuator OFF dBm 19 22
1dB
Attenuator ON 13 17
Leakage Current µA 10
T
rise
Ton, T
, T
fall
off
10% to 90% RF, 90% to 10% RF nS 150
50% Control to 90% RF, Control to 10% RF nS 150
Transients In Band mV 10
1. All measurements in a 50-τ system unless otherwise specified. The RF ports must be blocked out side of the package from
ground or any other voltage.
Typical Performance Curves
= +2.7 Volts
CTRL
AT-267
V 2.00
1
====
Insertion Loss with Negative Control
(-2.7, 0 V)
1.0
0.8
0.6
0.4
0.2
Insertion Loss (dB)
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
+85 °C
+25 °C
-40 °C
FREQUENCY (GHz)
Attenuation with Negative Control
(0. –2.7 V)
17
16
15
14
Attenuation (dB)
13
12
0.0 0.5 1.0 1.5 2.0 2.5 3.0
FREQUENCY (GHz)
+25 °C
-40 °C
+85 °C
VSWR, 0 and 15 dB States with
Negative Control (-2.7 V) +25 °C
2.0
1.8
1.6
SWR
V
1.4
1.2
1.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
15 dB 0 dB
FREQUENCY (GHz)
Attenuation with Positive Control
(0, +2.7 V)
17
16
15
14
13
Attenuation (dB)
12
0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2
FREQUENCY (GHz)
Specifications subject to change without notice.
North America: Tel. (800) 366-2266
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
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