MA-COM AT

AT-108
Voltage Variable Absorptive Attenuator
40 dB, 0.5—
0.5 — 3.0 GHz
SOIC-81
Features
•
•
•
•
•
•
Single Positive Voltage Control 0 to +5 Volts
40 dB Attenuation Range at 900 MHZ GHz
± 2 dB Linearity from BSL
Low DC Power Consumption
Low-Cost SOIC-8 Plastic Package
Tape and Reel Packaging Available
PIN 8
.1497/.1574
(3.80/4.00)
-B-
Oreintation
Mark
.2284/.2440
(5.80/6.20)
.010(.25)M B M
PIN 1
.1890/.1968
(4.80/5.00)
-A.0040/.0098
(.10/.25)
.0532/.0688
(1.35/1.75)
Description
M/A-COM’s AT-108 is a GaAs, MESFET MMIC voltage
variable absorptive attenuator in a low cost SOIC-8 lead surface
mount plastic package. The AT-108 is ideally suited for use
where linear attenuation fine tuning and very low power
consumption are required. Typical applications include radio,
cellular, GPS equipment and automatic gain/level control
circuits.
The AT-108 is fabricated with a monolithic GaAs MMIC using
a mature 1-micron process. The process features full chip
passivation for increased performance and reliability.
CHAMFER
(OPTIONAL
)
0°/80°
-C-
.004(0.10)
.013/.020 (8
(.33/.51)
PL)
.010(.25)M C A M B S
.050(1.27)BSC.
.016/.050
(0.40/1.27)
.0075/.0098
(.19/.25)
1. Dimensions are in inches/mm.
Ordering Information
Part Number
Package
AT-108
SOIC-8 Lead Plastic Package
AT-108TR
Forward Tape and Reel1
AT-108RTR
Reverse Tape and Reel1
1. If specific reel size is required, consult factory for part number
assignment.
Electrical Specifications: TA = 25°C1=
Parameter
Insertion Loss
Attenuation
Flatness
(Peak-to-Peak)
VSWR
Trise, Tfall
Ton, Toff
Transients
1.
Test Conditions1
0.5 - 1.0 GHz
1.0 - 3.0 GHz
0.5 - 1.0 GHz
1.0 - 2.0 GHz
2.0 - 3.0 GHz
0.5 - 1.0 GHz
1.0 - 2.0 GHz
2.0 - 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
dB
dB
dB
dB
µs
µs
mV
Min.
Typ.
2.5
3.2
Max.
2.7
3.5
±0.5
±1.2
±1.5
2:1
15
25
12
±0.8
±1.5
±1.8
40
35
28
All measurements in a 50Ω system.
Specifications subject to change without notice.
V 4.0
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.
Voltage Variable Absorptive Attenuator, 40 dB, 0.5-3.0 GHz
Absolute Maximum Ratings1
Parameter
Functional Schematic
Absolute Maximum
Maximum Input Power
+21 dBm
Supply Voltage VCC
-1V, +8V
Control Voltage VC
-1V, VCC + 0.5V
Operating Temperature
-40°C to +85°C
Storage Temperature
-65°C to +150°C
1.
AT-108
Operation of this device above any one of these parameters
may cause permanent damage.
GND
RF
GND
Vc
8
7
6
5
1
2
3
4
GND
GND
RF
V cc
PIN
Orientation Mark
1.
2.
3.
4.
VCC = +5 VDC @ 50 µA max.
VC = 0 VDC to +5 VDC @ 50 µA max.
External DC blocking capacitors are required on all RF ports.
39pF used for data measurements.
Typical Performance Curves
Attenuation vs. Control Voltage @ +25°C
0
-1.6
2200MHz
-1.8
-10
Insertion Loss (dB)
-15
1800MHz
-20
-25
-30
900MHz
-35
-40
-45
-50
-2
-2.2
-2.4
-2.6
2.84
2.69
0
-5
-5
Return Loss (dB)
Return Loss (dB)
2.53
Return Loss vs. Control Voltage @ +25°C
F = 1800 MHz
0
Output RL
-15
-20
-25
2.38
Frequency (GHz)
Return Loss vs. Control Voltage @ +25°C
F = 900 MHz
-10
2.22
Control Voltage (Volts)
2.06
0
1.91
0.5
1.75
1
1.6
1.5
1.44
2
1.28
2.5
1.13
3
0.97
3.5
0.82
4
0
4.5
0.66
-2.8
5
0.5
Attenuation (dB)
-5
Insertion Loss vs. Frequency
Input RL
Input RL
Output RL
-10
-15
-20
-30
-25
-35
5
4.5
4
3.5
3
2.5
2
1.5
Control Voltage (Volts)
1
0.5
0
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
Control Voltage (Volts)
Specifications subject to change without notice.
V 4.0
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.
Voltage Variable Absorptive Attenuator, 40 dB, 0.5-3.0 GHz
AT-108
Typical Performance Curves (Cont’d)
Attenuation vs. Control Voltage Typical
Device Deviation f = 900 MHz @ +25°C
Return Loss vs. Control Voltage @ +25°C
F = 2200 MHz
0
Return Loss (dB)
-4
Attenuation (dB)
-2
Output Return Loss
Input Return Loss
-6
-8
-10
-12
-14
-16
-18
-20
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
5
0
4.5
4
3
2.5
2
1.5
1
0.5
0
Attenuation vs. Control Voltage Typical
Device Deviation F = 1800 MHz @ +25°C
Maximum Attenuation vs. Frequency
0
-20
-5
Attenuation (dB)
-25
-30
-35
-40
-45
-10
-15
-20
-25
-30
-35
-40
-50
2.9
2.74
2.58
2.43
2.27
2.12
1.8
1.96
1.65
1.49
1.34
1.18
1.02
0.87
0.56
0.71
-45
0.4
Attenuation Rel to IL (dB)
3.5
Control Voltage(Volts)
Control Voltage (Volts)
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
Control Voltage(Volts)
Frequency (dB)
Attenuation vs. Control Voltage Typical
Device Deviations F = 2200 MHz @ +25°C
3
Attenuation Delta (dB)
0
-5
Attenuation (dB)
Attenuation vs. Temperature,
Normalized to +25°C, F=900 MHz
-10
-15
-20
-25
-30
-35
-40°C
2
-85°C
1
0
-1
-2
-40
5
-45
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
4
3
2
1
0
Control Voltage (Volts)
0
Control Voltage(Volts)
1 dB Compression vs. Control Voltage
@ +25°C, F = 900 MHz
35
IP3 vs. Control Voltage
25
IP3 (dBm)
Compression Point (dBm)
30
20
15
10
900 MHz
25
20
400 MHz
15
10
5
5
0
0
-5
5
5
4
3
2
1
0
Control Voltage (Volts)
4
3
2
1
0
Control Voltage (Volts)
Specifications subject to change without notice.
V 4.0
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.