MACOM AT-226 Datasheet
Digital Attenuator, 4 Bit, Single Control, 15 dB 0.5 - 2.0 GHz AT-226
B
AT-226
Digital Attenuator, 4 Bit, Single Control, 15 dB
0.5 - 2.0 GHz
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 us e 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.
Functional Schematic
Vs
RF1 GND GND GND GND GND GND RF2
PIN 16
1,2
TSSOP-16
PIN 16
.256
.246
6,5
6,25
PIN 1
.201
.193
5,11
4,9
.169
4,5
SC
.037
.033
0,95
0,85
.177
.169
4,5
4,29
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
1, 2, 3
8421
Truth Table
VC1 VC2 VC3 VC4 Attenuation (dB)
1 1 1 1 Reference I.L.
1110 1
1101 2
1011 4
0111 8
0000 15
PIN 1
G N D G N D V C 1 V C 2 V C 3 V C 4 G N D G N D
1. Required external blocking caps shown
2. V
can be applied at RF1 or RF2 using a 10KΩ or greater pull-up
S
resistor.
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.
1. Logic 0 = 0 + 0.2 V
2. Logic 1 = +5 V @ 30 µA max. current total
= +5 V
3. V
S
V3.00
Digital Attenuator, 4 Bit, Single Control, 15 dB 0.5 - 2.0 GHz AT-226
2
+
-
Electrical Specifications at TA = +25°C
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
1.0-2.0 GHz
±(0.25 dB + 5% of Attenuation setting in dB) dB
±(0.4 dB + 5% of Attenuation setting in dB) dB
VSWR 0.5 - 2.0 GHz 1.3:1 1.8:1
rise,Tfall
T
on, Toff
T
P
1dB
IP
2
s
µ
s
µ
Input Power >0.5 GHz dBm 24
Measured Relative to Input Power
>0.5GHz dBm 80
2.5
1.0
Two Tone input up to 5dBm, 5MHz
Spacing
IP
3
Measured Relative to Input Power
>0.5GHz dBm 47
Two Tone input up to 5dBm, 5MHz
Spacing
Typical Performance Curves
Relative Attenuation
16
14
12
10
8
6
4
ATTENUATION (dB)
2
0
0.5 1 1.5 2 2.5 3
FREQ UE NC Y (G Hz)
Input VSWR
2
1.9
1.8
1.7
1.6
1.5
VSWR
1.4
1.3
1.2
1.1
TWC* for all states
1
0.5 1 1.5 2 2.5 3
1
15dB
FREQUENCY (GHz)
1. TWC = Typical worst case over all states
2, 4dB
Insertion Loss
2.0
1.8
1.6
1.4
1.2
1.0
IL(dB)
0.8
0.6
0.4
0.2
0.0
0.5 1 1.5 2 2.5 3
Output VSWR
2
1.9
1.8
1.7
1.6
1.5
VSWR
1.4
1.3
1.2
1.1
TWC* for all states
1
0.511.522.53
+85°C
40°C
25°C
FREQUENCY (GHz)
1
15dB
, 4dB
FREQUENCY (GHz)
1. TWC = Typical worst case over all states
V3.00
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.
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