Digital Attenuator, 4 Bit, Single Control, 15 dB 0.5 - 2.0 GHz
AT-226
M/A-COM Division of AMP Incorporated
3
North America: Tel. (800) 366-2266, Fax (800) 618-8883
3
Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087
3
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
www.macom.com
AMP and Connecting at a Higher Level are trademarks.
Specifications subject to change without notice.
V3.00
Truth Table
1, 2, 3
Features
Single Control CMOS logic for each bit
Attenuation: 1 dB steps to 15 dB
Low DC Power Consumtion: 50 uW
Low Cost Plastic TSSOP - 16 Package
Description
The M/A-COM AT-226 is a 4 bit, 1 dB step GaAs MMIC digital
attenuator in a low cost TSSOP-16 surface mount plastic package.
The AT-226 is ideally suited for use where high accuracy, very
low power consumption and low intermodulation products are
required. Typical applications include radio, cellular, wireless
LANs, GPS equipment and other gain/level control circuits.
The AT-226 is fabricated using mature 1 micron GaAs MESFET
process. The process features full chip passivation for increased
performance and reliability.
TSSOP-16
Digital Attenuator, 4 Bit, Single Control, 15 dB
0.5 - 2.0 GHz
AT-226
.037
.033
0,95
0,85
.177
.169
4,5
4,29
.256
.246
6,5
6,25
.169
4,5
.201
.193
5,11
4,9
PIN 16
PIN 1
BSC
PIN Configuration
Pin No.
Function
Description
1,2,7,8
GND
RF Ground
3
VC1
Control 1
4
VC2
Control 2
5
VC3
Control 3
6
VC4
Control 4
9
RF2
RF in/out
10,11,12,13,14,15
GND
RF Ground
16
RF1
RF in/out
G N D G N D V C 1 V C 2 V C 3 V C 4 G N D G N D
P IN 1 6
P IN 1
8
4
2
1
V s
R F 1 G N D G N D G N D G N D G N D G N D R F 2
Functional Schematic
1,2
1. Required external blocking caps shown
2. V
S
can be applied at RF1 or RF2 using a 10K
or greater pull-up
resistor.
VC1
VC2
VC3
VC4
Attenuation (dB)
1
1
1
1
Reference I.L.
1
1
1
0
1
1
1
0
1
2
1
0
1
1
4
0
1
1
1
8
0
0
0
0
15
1. Logic 0 = 0 +
0.2 V
2. Logic 1 = +5 V @ 30
A max. current total
3. V
S
= +5 V
Digital Attenuator, 4 Bit, Single Control, 15 dB 0.5 - 2.0 GHz
AT-226
M/A-COM Division of AMP Incorporated
3
North America: Tel. (800) 366-2266, Fax (800) 618-8883
3
Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087
3
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
www.macom.com
AMP and Connecting at a Higher Level are trademarks.
Specifications subject to change without notice.
V3.00
Electrical Specifications at T
A
= +25C
Parameter
Test Conditions
Units
Min.
Typ.
Max.
Reference Insertion Loss
0.5 - 1.0 GHz
dB
1.3
1.6
1.0 - 2.0 GHz
dB
1.0
1.3
Attenuation Accuracy
0.5 - 1.0 GHz
(0.25 dB + 5% of Attenuation setting in dB) dB
1.0-2.0 GHz
(0.4 dB + 5% of Attenuation setting in dB) dB
VSWR
0.5 - 2.0 GHz
1.3:1
1.8:1
Trise,Tfall
s
2.5
Ton, Toff
s
1.0
P
1dB
Input Power
>0.5 GHz
dBm
24
IP
2
Measured Relative to Input Power
Two Tone input up to 5dBm, 5MHz
Spacing
>0.5GHz
dBm
80
IP
3
Measured Relative to Input Power
Two Tone input up to 5dBm, 5MHz
Spacing
>0.5GHz
dBm
47
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
VSWR
TWC* for all states
2, 4dB
15dB
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
VSWR
TWC* for all states
2, 4dB
15dB
Typical Performance Curves
Input VSWR
1
Output VSWR
1
1. TWC = Typical worst case over all states
1. TWC = Typical worst case over all states
0
2
4
6
8
10
12
14
16
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
ATTENUATION (dB)
Relative Attenuation
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
IL(dB)
+25C
-40C
+85C
Insertion Loss
Digital Attenuator, 4 Bit, Single Control, 15 dB 0.5 - 2.0 GHz
AT-226
M/A-COM Division of AMP Incorporated
3
North America: Tel. (800) 366-2266, Fax (800) 618-8883
3
Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087
3
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
www.macom.com
AMP and Connecting at a Higher Level are trademarks.
Specifications subject to change without notice.
V3.00
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
DEVIATION FROM NOMINAL
ATTENUATION (dB)
1dB
2dB
4dB
8dB
15dB
Typical Performance Curves (Cont'd)
Attenuation Accuracy vs Frequency
Absolute Maximum Ratings
1
Parameter
Maximum Ratings
Maximum Input Power
50 MHz
+27 dBm
500 - 2000 MHz
+34 dBm
Control Voltage
+8 V, -1.0 V
Operating Temperature
-40C to +85C
Storage Temperature
-65C to +150C
1. Exceeding these limits may cause permanent damage.
-0.25
-0.2
-0.15
-0.1
-0.05
0
0.05
0.1
0.15
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
DELTA (dB)
1dB
4dB
8dB
15dB
2dB
-0.1
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.5
1
1.5
2
2.5
3
FREQUENCY (GHz)
DELTA (dB)
1dB
2dB
4dB
8dB
15dB
Delta ATT +25C to -40C
Delta ATT +25C to+85C
Digital Attenuator, 4 Bit, Single Control, 15 dB 0.5 - 2.0 GHz
AT-226
M/A-COM Division of AMP Incorporated
3
North America: Tel. (800) 366-2266, Fax (800) 618-8883
3
Asia/Pacific: Tel.+85 2 2111 8088, Fax +85 2 2111 8087
3
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
www.macom.com
AMP and Connecting at a Higher Level are trademarks.
Specifications subject to change without notice.
V3.00
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