Digital Attenuator, 30 dB, 4-Bit
DC - 2 GHz
AT-220
V3.00
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 3 3263 8761
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 3 3263 8769
Fax +44 (1344) 300 020
1
Specifications Subject to Change Without Notice.
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Features
Attenuation 2-dB Steps to 30 dB
High Accuracy +/-3%
Temperature Stability +/-0.15 dB from -40C to +85C
Low Intermodulation Product: +50 dBm IP3
Low DC Power Consumption: 50 mW
Low Cost SOIC 16 Plastic Package
Tape and Reel Packaging Available1
Description
M/A-COM's AT-220 is a 4-bit, 2-dB step GaAs MMIC
digital attenuator in a low cost SOIC 16-lead surface
mount plastic package. The AT-220 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-220 is fabricated with a monolithic GaAs MMIC
using a mature 1-micron process. The process features
full chip passivation for increased performance and
reliability.
SO-16
.013-.020 TYP
(0.33-0.51)
.0040-.0098
(0.10-0.25)
.2284-.2440
(5.80-6.20)
Pin #16
Orientation
Mark
.010(0.25) M B M
.1497-.1574
(3.80-4.00)
-B-
0.3859-0.3937
(9.80-10.00)
-A-
0.050(1.27) BSC.
.0532-.0688
(1.35-1.75)
.010(0.25) M C A M B S
16-Lead SOP outline dimensions
Narrow body .150
(All dimensions per JEDEC No. MS-012-AC, 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-
Pin #1
Unless Otherwise Noted: .xxx = 0.010 (.xx = 0.25)
.xx = 0.02 (.x = 0.5)
.004 (0.10)
Part Number
Package
AT-220 PIN
SOIC 16-Lead Plastic Package
AT-220TR
Forward Tape & Reel
AT-220RTR
Reverse Tape & Reel
Ordering Information
Parameter
Test Conditions
2
Unit
Min.
Typ.
Max
Reference Insertion Loss
DC 0.1 GHz
dB
1.2
1.4
DC 0.1 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
3
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,
T
A
= 25C
1. Refer to "Tape and Reel Packaging" Section, or contact factory.
2. All measurements at 1 GHz in a 50
system, unless otherwise specified.
3. Attenuation accuracy specifications apply with negative bias control and low inductance grounding.
AT-220 11/15/96 1:49 PM Page 1 (Black plate)
Digital Attenuator, 30 dB, 4-Bit
AT-220
V3.00
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 3 3263 8761
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 3 3263 8769
Fax +44 (1344) 300 020
2
Specifications Subject to Change Without Notice.
Functional Schematic
Absolute Maximum Ratings
1
1. Operation of this device above any one of these parameters may
cause permanent damage.
Parameter Absolute
Maximum
Max. Input Power
50 MHz
+27 dBm
500-2000 MHz
+34 dBm
Control Voltage
+5V, -8.5V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
Typical Performance
Pin Configuration
INSERTION LOSS vs FREQUENCY
LOSS (dB)
FREQUENCY (GHz)
0
0.5
1.0
1.5
2.0
3.0
0
2.0
1.0
+ 85C
+ 25C
- 40C
2.0
VSWR vs FREQUENCY
1.8
0
0.5
1.6
1.0
1.0
1.5
2.0
FREQUENCY (GHz)
VSWR
1.4
1.2
4 dB ATTEN
8 dB ATTEN
2 dB ATTEN
16 dB ATTEN
INSERTION LOSS
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
-32
ATTENUATION vs FREQUENCY
LOSS (dB)
FREQUENCY (GHz)
0.0
0.5
1.0
1.5
2.0
1.5
ATTENUATION ACCURACY vs FREQUENCY
1
0.0
0.5
-0.5
-1.5
1.0
1.5
2.0
DEVIATION FROM
NOMINAL ATTENUATION (dB)
-1
0.5
0
FREQUENCY (GHz)
4 dB ATTEN
2 dB ATTEN
16 dB ATTEN
8 dB ATTEN
30 dB ATTEN
Pin Description
Pin
No. Description
1
VC1
9
RF2
2
VC1
10
GND
3 VC2
11
GND
4 VC2
12
GND
5 VC3
13
GND
6 VC3
14
GND
7 VC4
15
GND
8 VC4
16
RF1
Control Inputs
VC4 VC4 VC3 VC3 VC2 VC2 VC1 VC1 Attenuation
(dB)
1
0
1
0
1
0
1
0
Reference
0
1
1
0
1
0
1
0
2 dB
1
0
0
1
1
0
1
0
4 dB
1
0
1
0
0
1
1
0
8 dB
1
0
1
0
1
0
0
1
16 dB
0
1
0
1
0
1
0
1
30 dB
"0" = Vin Low, Vin Low = 0V, "1" = Vin High, Vin High = -5V
"0" = 0 to -0.2V @ 20 A Max
"1" = -5V @ 10 A typ to -8V @ 200 A Max
3
2
1
0
RF1 GNDGND
GND GND GND RF2
GND
VC1 VC1 VC2
VC3 VC3 VC4 VC4
VC2
8 dB
4 dB
2 dB
1 dB
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Truth Table
AT-220 11/15/96 1:49 PM Page 2 (Black plate)
Digital Attenuator, 30 dB, 4-Bit
AT-220
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 3 3263 8761
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 3 3263 8769
Fax +44 (1344) 300 020
3
Specifications Subject to Change Without Notice.
V3.00
FREQUENCY (GHz)
ATTENUATION (
d
B)
32
28
24
20
16
12
8
4
0
0
0.2
0.4
0.6
0.8
1
ATTENUATION vs FREQUENCY
FREQUENCY (GHz)
S11 (dB)
0
-5
-10
-15
-20
-25
-30
0
0.2
0.4
0.6
0.8
1
S11 vs FREQUENCY
0 dB
2 dB
8 dB
4 dB
16 dB
30 dB
Swept Data Characterized in 75 Ohms
AT-220 11/15/96 1:49 PM Page 3 (Black plate)
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