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Functional Schematic
V
CC
5
V
CTL
4
Single Positive Voltage Control 0 to +2.25 Volts
>50 dB Attenuation Range at 2.1 GHz
Low DC Power Consumption
Low Cost SOT-25 Plastic Package
Tape and Reel Packaging Available
Description
M/A-COM鈥檚 AT-119 is a GaAs MMIC voltage variable
absorptive attenuator in a low cost, SOT-25 five-lead,
surface mount plastic package. M/A-COM fabricates the
AT-119 with a proven monolithic GaAs self-aligned gate
process that features full chip passivation for performance
and reliability
1
RF
100 pF
2
GND
3
100 pF
RF
Applications
The AT-119 is ideally suited for applications that require
fine tuning, linear attenuation with voltage, and very low
power consumption.
Typical applications for the AT-119 include automatic gain
control circuits in satellite radio receivers and other wireless
receivers.
1. V
CC
= +3.3 V
DC
@ 50 碌A(chǔ) max.
2. V
CTL
= 0 V
DC
to +3.3 VDC @ 50 碌A(chǔ) max.
3. External DC blocking capacitors are required on all RF
ports.
Absolute Maximum Ratings
1
@ T
A
= +25 擄C (unless otherwise specified)
Parameter
Maximum Input Power
Supply Voltage V
CC
ControlVoltage V
CTL
Operating Temperature
Storage Temperature
Absolute Maximum
+21 dBm
-1 V, + 8 V
-1 V, V
CC
+0.5 V
-40擄C to +85擄C
-65擄C to +150擄C
1. Exceeding any one or a combination of these limits may
cause permanent damage.
Electrical Specifications @ T
A
= +25 擄C, Frequency = 2.4 GHz, V
CC
= 3.3 V
DC1
Parameters
Test Conditions
Units
Min
Typ
Max
Minimum Insertions Loss
Maximum Attenuation
Attenuation Slope
Return Loss
Input Power for 1 dB Change in Attenua-
tion
Input 3
rd
Order Intercept Point
Switching Speed
Transients
V
CTL
= 2.25 V
DC
V
CTL
= 0.5 V
DC
0.75 V
DC
< V
CTL
< 1.75 V
DC
0.6 V
DC
< V
CTL
< 1.75 V
DC
0 V
DC
< V
CTL
< 3.0 V
DC
0 V
DC
< V
CTL
< 3.0 V
DC
50% V
CTL
to 10% / 90% RF
V
CTL
= 3 V
DC,
In-Band
dB
dB
dB/V
dB
dBm
dBm
nSec
mV
37
24
3.0
3.2
>12
>10
>20
180
10
1. All measurements in a 50-蟿 system unless otherwise specified. The RF ports must be blocked outside of the package from
ground or any other voltage.
1
2
3
4
