AT-118
Voltage Variable
Absorptive Attenuator
Features
•
•
•
•
•
Single Positive Control 0 to 3 Volts
15 dB Voltage Variable Attenuation
± 2 dB Linearity from BSL
Positive Control Logic
Low Cost MSOP-8 Plastic Package
MSOP-8
1
R .0 1 0
ID P IN
0 .0 0 7
0 .1 1 8
4X 12°
0 .1 9 3
.0 2 0
.0 2 0
0 .1 1 8
0 .0 2 5 6 0 .0 2 1
Description
M/A-COM’s AT-118 is a linear GaAs MMIC voltage variable
absorptive attenuator in a low cost MSOP-8 surface mount
plastic package. The AT-118 is ideally suited for applications
where linear attenuation and fine tuning are required.
Typical applications include radio, cellular, GPS equipment and
automatic gain/level control circuits.
The AT-118 is fabricated with a mature 1 micron gate length
GaAs MESFET process. The process features full chip
passivation for increased performance and reliability.
1.
4X 12°
3°
0 .0 3 4
0 .0 1 3
0 .0 0 8
0 .0 4 0
Dimensions are in inches.
Ordering Information
Part Number
AT-118 PIN
AT-118TR
Package
MSOP 8-Lead Plastic
Forward Tape and Reel
1
1. Reference Application Note M513 for reel size information.
Electrical Specifications: T
A
= +25°C
1
=
Parameter
Insertion Loss
Attenuation
Insertion Loss Flatness (Peak-to-Peak)
VSWR
T
rise
,
T
fall
T
on
,
T
off
Transients
1.
Test Conditions
0.5 - 3.0 GHz
0.5 - 1.0 GHz
1.0 - 3.0 GHz
0.5 - 3.0 GHz
0.5 - 3.0 GHz
10% to 90% RF, 90% to 10% RF
50% Control to 90% RF, Control to 10% RF
In-band
Units
dB
dB
dB
dB
µS
µS
mV
Min.
12
15
Typ.
1.6
14
16
±0.3
2:1
10
12
10
Max.
1.9
±0.5
All measurements taken at 900 GHz in a 50Ω system unless otherwise specified. Loss varies at 0.003 dB/°C.
Specifications subject to change without notice.
North America:
Tel. (800) 366-2266, Fax (800) 618-8883
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.
V 4.0
1
Voltage Variable Absorptive Attenuator
Absolute Maximum Ratings
1
Parameter
Maximum Input Power
Supply Voltage V
CC
Control Voltage V
C
Operating Temperature
Storage Temperature
1.
AT-118
Functional Schematic
1, 2, 3
Absolute Maximum
+21 dBm
-1V, +8V
-1V, V
CC
+0.5V
-40°C to +85°C
-65°C to +150°C
GND
RF
Vcc
GND
1
2
3
4
8
7
6
5
GND
RF
Vc
GND
Exceeding any one or a combination of these limits may cause
permanent damage.
1.
2.
3.
4.
V
CC
= +3 V
DC
@ 20 µA max.
V
C
= 0 V
DC
to +3 V
DC
@ 75 µA max.
External DC blocking capacitors are required on all RF ports.
39 pF used for data measurements.
Typical Performance Curves
0
-0.2
-0.4
-0.6
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
Q
Insertion Loss vs. Frequency
0
-2
Attenuation vs. Control Voltage
ATTENUATION (dB)
CONTROL VOLTAGE
-4
-6
-8
-10
-12
-14
-16
-18
3
2.5
2
1.5
1
0.5
0
1.8 GHz
2.4 GHz
900 MHz
LOSS (dB)
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
ATTENUATION (dB)
CONTROL VOLTAGE (Volts)
0
-2
ATTENUATION (dB)
-4
-6
-8
-10
-12
-14
-16
-18
Attenuation vs. Frequency @ Vc = 0V
ATTENUATION (dB)
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
Typical Device Variation
F = 900 MHz
0.5
1
1.5
2
2.5
3
3
2.5
2
1.5
1
0.5
0
FREQUENCY (GHz)
CONTROL VOLTAGE
CONTROL VOLTAGE (Volts)
Specifications subject to change without notice.
North America:
Tel. (800) 366-2266, Fax (800) 618-8883
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.
V 4.0
2
Voltage Variable Absorptive Attenuator
Typical Performance Curves (Cont’d)
Attenuation vs. Temperature Normalized to
+25°C
35
30
+ 85C
AT-118
1
ATTENUATION DELTA (dB)
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
IP3 vs. Control Voltage
500 MHz
25
IP3 (dBm)
20
15
10
5
0
0.5
1
1.5
2
2.5
3
900 MHz
- 40C
0
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE
CONTROL VOLTAGE (Volts)
CONTROL VOLTAGE (Volts)
CONTROL VOLTAGE
0
RETURN LOSS (dB)
-5
-10
-15
Return Loss vs. Control Voltage
COMPRESSION POINT (dBm)
F = 900 MHz
16
14
1 dB Compression vs. Control Voltage
900 MHz
12
10
8
6
4
2
0
0
0.5
1
1.5
2
2.5
3
500 MHz
INPUT
OUTPUT
-20
-25
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE
CONTROL VOLTAGE (Volts)
CONTROL VOLTAGE
CONTROL VOLTAGE (Volts)
Specifications subject to change without notice.
North America:
Tel. (800) 366-2266, Fax (800) 618-8883
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.
V 4.0
3
Embedded System
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