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
Specifications subject to change without notice.
Visit www.macom.com for additional data sheets and product information.
V 4.0
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
Electrical Specifications: T
A
= +25C
1
=
=
=
=
Parameter
Test Conditions
Units
Min.
Typ.
Max.
Insertion Loss
0.5 - 3.0 GHz
dB
1.6
1.9
Attenuation
0.5 - 1.0 GHz
dB
12
14
1.0 - 3.0 GHz
dB
15
16
Insertion Loss Flatness (Peak-to-Peak)
0.5 - 3.0 GHz
dB
0.3
0.5
VSWR
0.5 - 3.0 GHz
2:1
T
rise
, T
fall
10% to 90% RF, 90% to 10% RF
S
10
T
on
, T
off
50% Control to 90% RF, Control to 10% RF
S
12
Transients
In-band
mV
10
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.
Ordering Information
Part Number
Package
AT-118 PIN
MSOP 8-Lead Plastic
AT-118TR
Forward Tape and Reel
1
1. Reference Application Note M513 for reel size information.
1. All measurements taken at 900 GHz in a 50
system unless otherwise specified. Loss varies at 0.003 dB/C.
ID P IN
0 .1 9 3
.0 1 0
R
0 .1 1 8
.0 2 0
.0 2 0
0 .0 2 5 6
0 .1 1 8
1 2
4 X
0 .0 3 4
0 .0 4 0
0 .0 0 8
0 .0 1 3
1 2
4 X
0 .0 0 7
0 .0 2 1
3
1. Dimensions are in inches.
AT-118
Voltage Variable
Absorptive Attenuator
1
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
Specifications subject to change without notice.
Visit www.macom.com for additional data sheets and product information.
V 4.0
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE
AT
T
E
NUAT
I
O
N (d
B)
F = 900 MHz
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
AT
T
E
NUAT
I
O
N (d
B)
-18
-16
-14
-12
-10
-8
-6
-4
-2
0
0
0.5
1
1.5
2
2.5
3
ATTENUATION (dB)
C
O
N
T
R
OL VOLTA
GE
900 MHz
1.8 GHz
2.4 GHz
Q
-2
-1.8
-1.6
-1.4
-1.2
-1
-0.8
-0.6
-0.4
-0.2
0
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
LO
SS (dB
)
Typical Performance Curves
Insertion Loss vs. Frequency
Attenuation vs. Control Voltage
Attenuation vs. Frequency @ Vc = 0V
Typical Device Variation
Functional Schematic
1, 2, 3
Parameter
Absolute Maximum
Maximum Input Power
+21 dBm
Supply Voltage V
CC
-1V, +8V
Control Voltage V
C
-1V, V
CC
+0.5V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
Absolute Maximum Ratings
1
1. Exceeding any one or a combination of these limits may cause
permanent damage.
1. V
CC
= +3 V
DC
@ 20 A max.
2. V
C
= 0 V
DC
to +3 V
DC
@ 75 A max.
3. External DC blocking capacitors are required on all RF ports.
4. 39 pF used for data measurements.
1
4
2
3
7
5
6
8
RF
GND
Vcc
Vc
RF
GND
GND
GND
CONTROL VOLTAGE (Volts)
CONTROL VOLTAGE (Volts)
AT
T
E
NUAT
I
O
N (d
B)
Voltage Variable Absorptive Attenuator
AT-118
2
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
Specifications subject to change without notice.
Visit www.macom.com for additional data sheets and product information.
V 4.0
0
2
4
6
8
10
12
14
16
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE
CO
M
P
RESSI
O
N
PO
I
N
T
(d
Bm)
500 MHz
900 MHz
-25
-20
-15
-10
-5
0
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE
RE
TURN LO
S
S
(
d
B)
INPUT
OUTPUT
F = 900 MHz
0
5
10
15
20
25
30
35
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE
IP3 (
d
Bm)
500 MHz
900 MHz
-1
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
0
0.5
1
1.5
2
2.5
3
CONTROL VOLTAGE
AT
T
E
NUAT
ION DEL
T
A
(
d
B)
+ 85C
- 40C
Typical Performance Curves (Cont'd)
Attenuation vs. Temperature Normalized to
+25C
IP3 vs. Control Voltage
Return Loss vs. Control Voltage
1 dB Compression vs. Control Voltage
CONTROL VOLTAGE (Volts)
CONTROL VOLTAGE (Volts)
CONTROL VOLTAGE (Volts)
CONTROL VOLTAGE (Volts)
Voltage Variable Absorptive Attenuator
AT-118
3
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