V 2.00
O rdering Info r m a t i o n
*
If specific reel size is required, consult factory for part number
assignment.
Digital Attenuator, 15.5 dB, 5-Bit
DC - 2 GHz
AT-280
Parameter
Test Conditions
2
Unit
Min.
Typ.
Max
Reference
DC 0.1 GHz
dB
1.1
1.3
Insertion
DC 0.5 GHz
dB
1.3
1.5
Loss
DC 1.0 GHz
dB
1.5
1.8
DC 2.0 GHz
dB
1.8
2.0
Attenuation Accuracy
2
DC 1.0 GHz
(0.20 dB + 3% of Atten. Setting in dB) dB
DC 2.0 GHz
(0.30 dB + 3% of Atten. Setting in dB) dB
VSWR
(any state)
1.5:1
1.8:1
Trise, Tfall
10% to 90% RF, 90% to 10% RF
nS
12
Ton, Toff
50% Control to 90% RF, 50% Control to 10% RF
nS
18
Transients
In Band
mV
30
One dB
Input Power
0.05 GHz
dBm
22
Compression
Input Power
0.5 2.0 GHz
dBm
27
IP2
Measured Relative
0.05 GHz
dBm
53
to Input Power
0.5 2.0 GHz
dBm
68
(for two-tone input power up to +5 dBm)
IP3
Measured Relative
0.05 GHz
dBm
40
to Input Power
0.5 2.0 GHz
dBm
45
(for two-tone input power up to +5 dBm)
S O - 1 6
1. All measurements at 1 GHz in a 50
system, unless otherwise specified.
2. Attenuation accuracy specifications apply with negative bias control and low inductance grounding.
F e a t u r e s
Attenuation: 0.5-dB Steps to 15.5 dB
Te m p e r a t u re Stability: 0.15 dB from -40C to
+85C Ty p i c a l
Ultra Low DC Power Consumption
Low Intermodulation Products, IP3: 45 dBm
Tape and Reel Packaging Av a i l a b l e
D e s c r i p t i o n
M/A-COM's AT-280 is a 5-bit, 0.5 dB-step GaAs MMIC
digital attenuator in a low cost SOIC 16-lead surface mount
plastic package. The AT-280 is ideally suited for use where
high accuracy, fast switching, very low power consumption
and low intermodulation products are re q u i red at a low
cost. Typical applications include radio and cellular
equipment, wireless LANS, GPS equipment and other
Gain/Level Control circ u i t s .
The AT-280 is fabricated with a monolithic GaAs MMIC
using a mature 1-micron process. The process features full
chip passivation for increased perf o rmance and re l i a b i l i t y .
Part Number
Package
AT-280 PIN
SOIC 16-Lead
AT-280TR
Forward Tape & Reel*
AT-280RTR
Reverse Tape & Reel*
q
q
q
q
q
Electrical Specifications, T
A
= 25C
V 2.00
Digital Attenuator, 15.5 dB, 5-Bit
AT-280
Functional Sch e m a t i c
Parameter
Absolute Maximum
1
Max. Input Power
0.05 GHz
+27 dBm
0.5 2.0 GHz
+34 dBm
Control Voltage
+5V, 8.5V
Operating Temperature
40C to +85C
Storage Temperature
65C to +150C
Absolute Maximum Ratings
1
1.Operation of this device above any one of these parameters may cause
permanent damage.
Truth Ta bl e
0 = VinLow = 0 V = 0 to -0.2 V @ 20 A maximum
Typical Pe r fo r m a n c e
Control Inputs
VC5 VC4 VC3 VC3 VC2 VC2 VC1 VC1
Attenuation (dB)
1
1
1
0
1
0
1
0
Reference
0
1
1
0
1
0
1
0
0.5 dB
1
0
1
0
1
0
1
0
1 dB
1
1
0
1
1
0
1
0
2 dB
1
1
1
0
0
1
1
0
4 dB
1
1
1
0
1
0
0
1
8 dB
0
0
0
1
0
1
0
1
15.5 dB
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