Features
q
Attenuation 4-dB Steps to 28 dB
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High Accuracy +/- 3%
q
Low DC Power Consumption: 50 W
q
Low Intermodulation Product: +50 dBm IP3
q
Temperature Range: -40C to +85C
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Low Cost SOIC14 Plastic Package
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Tape and Reel Packaging Available1
Description
M/A-COM's AT-230 is a 3-bit, 4-dB step GaAs MMIC
digital attenuator in a low cost SOIC 14-lead surface
mount plastic package. The AT-230 is ideally suited for
use where high accuracy, fast switching, very low power
consumption and low intermodulation products are
required. Typical applications include radio and cellular
equipment, wireless LANs, GPS equipment and other
Gain/Level Control circuits.
The AT-230 is fabricated with a monolithic GaAs MMIC
using a mature 1-micron process. The process features full
chip passivation for increased performance and reliability.
Digital Attenuator, 28 dB, 3-Bit
DC - 2 GHz
AT-230
SO-14
Parameter
Test Conditions
Unit
Min.
Typ.
Max
Reference Insertion Loss
DC 0.1 GHz
dB
1.2
1.4
DC 0.5 GHz
dB
1.5
1.7
DC 1.0 GHz
dB
1.6
1.8
DC 2.0 GHz
dB
1.8
2.1
Attenuation Accuracy
DC 1.0 GHz
(0.15 dB +3% of Attenuation Setting in dB) dB
DC 2.0 GHz
(0.30 dB +3% of Attenuation Setting in dB) dB
VSWR
1.2:1
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
25
1 dB
Input Power
0.05 GHz
dBm
20
Compression
Input Power
0.5 2.0 GHz
dBm
28
Measured Relative
0.05 GHz
dBm
45
IP
2
to Input Power
0.5 2.0 GHz
dBm
68
(for two-tone input power up to +5 dBm)
Measured Relative
0.05 GHz
dBm
40
IP
3
to Input Power
0.5 2.0 GHz
dBm
50
(for two-tone input power up to +5 dBm)
Electrical Specifications
1
, T
A
= +25C
1. All measurements at 1 GHz in a 50
system, unless otherwise specified.
.013-.020 TYP
(0.33-0.51)
.0040-.0098
(0.10-0.25)
.2284-.2440
(5.80-6.20)
Pin #14
Orientation
Mark
Pin #1
.010(0.25) M B M
.1497-.1574
(3.80-4.00)
-B-
.3357-.3444
(8.55-8.75)
-A-
0.050(1.27) BSC.
.0532-.0688
(1.35-1.75)
.010(0.25) M C A M B S
14-Lead SOP outline dimensions
Narrow body .150
(All dimensions per JEDEC No. MS-012-AB, Issue C)
Dimensions in ( ) are in mm.
0-8
.0099-.0196 x 45 Chamfer
(0.25-0.50)
.016-.050
(0.40-1.27)
.0075-.0098
(0.19-0.25)
-C-
Ordering Information
Part Number
Package
AT-230 PIN
SOIC 14-Lead Plastic
AT-230TR
Forward Tape & Reel
AT-230RTR
Reverse Tape & Reel
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
s
1011 Pawtucket Boulevard, Lowell, MA 01853 USA
s
Telephone: 800-366-2266
V2.0
* If specific reel size is required, consult factory for part
number assignment.
0 = VIN Low = 0 V to -0.2 V @ 20 *A maximum
1 = VIN High = -5 V @ 10 *A typ. to -8 V @ 200 *A maximum
Parameter
Absolute Maximum
Max. Input Power
50 MHz
+27 dBm
500-2000 MHz
+34 dBm
Control Voltage
+5 V, -8.5 V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
AT-230
Digital Attenuator, 28 dB, 3-Bit
14
RF1
13
GND
12
GND
11
GND
10
GND
9
GND
8
RF2
VC2
VC2
1
2
3
4
5
6
7
VC1
VC1
VC3
VC3
GND
16 dB
8 dB
4dB
Functional Schematic
Absolute Maximum Ratings
1
1. Operation of this device above any one of these parameters may cause
permanent damage
Truth Table
VSWR vs FREQUENCY
0.5
1.0
1.5
2.0
2.0
1.4
0
VSWR
FREQUENCY (GHz)
1.8
1.6
1.2
1
4 dB ATTEN
INSERTION LOSS
8 dB ATTEN
16 dB ATTEN
Typical Performance
ATTENUATION vs FREQUENCY
0.5
1.0
1.5
2.0
0
-2
0
LOSS (dB)
FREQUENCY (GHz)
-10
-12
-16
-4
-6
-8
-14
-18
-20
-22
-24
-26
-28
-30
-32
ATTENUATION ACCURACY vs FREQUENCY
0.5
1.0
1.5
2.0
1.5
0
0
FREQUENCY (GHz)
1
0.5
-0.5
-1
4 dB ATTEN
8 dB ATTEN
16 dB ATTEN
-1.5
28 dB ATTEN
NOMINAL ATTENUATION (dB)
INSERTION LOSS vs FREQUENCY
0.5
1.0
1.5
2.0
3.0
0
LOSS (dB)
FREQUENCY (GHz)
2.0
1.0
0
+85
C
-40
C
+25
C
Control Input
VC3 VC3 VC2 VC2 VC1 VC1
Atten
(dB)
1
0
1
0
1
0 Reference
0
1
1
0
1
0
4 dB
1
0
0
1
1
0
8 dB
1
0
1
0
0
1
16 dB
0
1
0
1
0
1
28 dB
M/A-COM, Inc.
s
1011 Pawtucket Boulevard, Lowell, MA 01853 USA
s
Telephone: 800-366-2266
Specifications Subject to Change Without Notice.
V2.0
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