AT-119 Datasheet, PDF (1/4 Pages) Tyco Electronics – 2.25 Volt Voltage Variable Absorptive Attenuator - 40 dB, 1.8.2.5 GHz

2.25 Volt Voltage Variable Absorptive
Attenuator - 40 dB, 1.8—2.5 GHz
Features
 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
Functional Schematic
V_CC
5
V_CTL
4
Description
M/A-COM’s 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
2
3
RF _{100 pF} GND _{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 µA max.
2. V_CTL = 0 V_DC to +3.3 VDC @ 50 µA max.
3. External DC blocking capacitors are required on all RF
ports.
Absolute Maximum Ratings¹
@ T_A = +25 °C (unless otherwise specified)
Parameter
Absolute Maximum
Maximum Input Power
+21 dBm
Supply Voltage V_CC
ControlVoltage V_CTL
Operating Temperature
-1 V, + 8 V
-1 V, V_CC +0.5 V
-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.
Electrical Specifications @ T_A = +25 °C, Frequency = 2.4 GHz, V_CC = 3.3 V_DC1
Parameters
Test Conditions
Units
Min
Typ
Max
Minimum Insertions Loss
V_CTL = 2.25 V_DC
dB
3.0
3.2
Maximum Attenuation
V_CTL = 0.5 V_DC
dB
37
Attenuation Slope
0.75 V_DC < V_CTL < 1.75 V_DC
dB/V
24
Return Loss
0.6 V_DC < V_CTL < 1.75 V_DC
dB
>12
Input Power for 1 dB Change in Attenua-
tion
0 V_DC < V_CTL < 3.0 V_DC
dBm
>10
Input 3^rd Order Intercept Point
0 V_DC < V_CTL < 3.0 V_DC
dBm
>20
Switching Speed
50% V_CTL to 10% / 90% RF
nSec
180
Transients
V_CTL = 3 V_DC, In-Band
mV
10
1. All measurements in a 50-τ system unless otherwise specified. The RF ports must be blocked outside of the package from
ground or any other voltage.