GaAs Digital Attenuator, 31 dB, 5 Bit
DC - 2 GHz
AT-357
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 (03) 3226-1671
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 (03) 3226-1451
Fax +44 (1344) 300 020
1
Specifications Subject to Change Without Notice.
V3.00
C-46
Operating Characteristics
p
g
Impedance
50 Ohms Nominal
Switching Characteristics
Ton, (50% CTL to 90% RF)
160 ns Typ
Toff (50% CTL to 10% RF)
80 ns Typ
Trise, (10% RF to 90% RF)
15 ns Typ
Tfall (90% RF to 10% RF)
3 ns Typ
Switching Transients (unfiltered)
130 mV Typ
Input Power for 1 dB Compression
0.5 2.0 GHz
28 dBm Typ
0.05 GHz
15 dBm Typ
Intermodulation Intercept Point (for two-tone input power up to +5 dBm)
Intercept Points
IP2
IP3
0.5 2.0 GHz
+55
+47
dBm Typ
0.05 GHz
+45
+28
dBm Typ
Bias Power
+15 VDC @ 5 mA Max
-12 VDC @ 3 mA Max
Control
5 line, TTL Data Bus
Vin Low (0)
0.0 to 0.8V @ 1
A Max
Vin High (1)
2.4 to 5.0V @ 1
A Max
1. All specifications apply when operated with bias voltages of +15 VDC and -12VDC
and a 50 ohm impedance at both RF ports.
2. Above reference insertion loss.
3. Contact the factory for standard or custom screening requirements.
Control Input
Attenuator Setting
C1
C2
C3
C4
C5
0
0
0
0
0
REFERENCE
1
0
0
0
0
1 dB
0
1
0
0
0
2 dB
0
0
1
0
0
4 dB
0
0
0
1
0
8 dB
0
0
0
0
1
16 dB
Any Combination Sum of Bits Selected
"1" = Logic High (TTL) "0" = Logic Low (TTL)
1 dB
2 dB
4 dB
8 dB
16 dB
RF1
RF2
+15V
GND
GND
GND
GND -12V
C1
C2
C3
C4
C5
0.205
(5.21)
0.250
0.000
.093.005 Dia Thru
(2.36 0.13)
4 Places
0.070
(1.78)
0.000
Removable
SMA Jack
Receptacle
2 Places
1.375
(34.92)
1.235 .005
0.000
0.250
0.090 (2.29)
10 Places
0.900 Ref.
.025 .005 Dia Pin
(0.64 0.13)
11 Places
0.000
0.330
(8.38)
0.230 (5.84)
0.660 (16.76)
(31.37 0.13)
(6.35)
(22.86)
(6.35)
0.000
0.23 Ref
0.115
(2.92)
(5.8)
0.115 (2.92)
0.20
(5.1)
Typ
.xx = 0.02 (.x = 0.5)
Bottom of case is AC ground.
Dimensions in ( ) are in mm.
Unless Otherwise Noted: .xxx = 0.010 (.xx = 0.25)
p
(
)
Frequency Range
DC to 2.0 GHz
Nominal Attenuation
2
1 dB Steps to 31 dB
Attenuation Accuracy
DC 1.0 GHz
(0.2 dB + 2% of Attenuation Setting in dB) dB
1.0 2.0 GHz
(0.2 dB + 2% of Attenuation Setting in dB) dB
VSWR
DC .025 GHz
2.2:1 Max
.025 0.5 GHz
1.8:1 Max
0.2 2.0 GHz
1.5:1 Max
0.5 1.0 GHz
1.4:1 Max
Reference Insertion Loss
DC 0.5 GHz
5.5 dB Max
0.5 1.0 GHz
6.0 dB Max
1.0 2.0 GHz
6.5 dB Max
q
q
q
Features
Attenuation 1 dB Steps to 31 dB
TTL Control Interface
Hermetic Connectorized Housing
Guaranteed Specifications
1
(-55C to +85C)
Functional Schematic (Top View)
Truth Table
Ordering Information
Model No.
Package
AT-357 SMA
Connectorized
Note: 1. Operation of this device above any one of these parameters may cause
permanent damage.
Parameter Absolute
Maximum
1
Max. Input Power
0.05 GHz
+27 dBm
0.5 2.0 GHz
+32 dBm
Bias Voltage
+15V Supply (V+)
-0.7V to + 18V
-12V Supply (V-)
-15V to + 0.7V
Control Voltage
(V-)-2V to (V+)+2V
(or 30 mA, whichever comes first)
Operating Temperature
-55
C to +125
C
Storage Temperature
-65
C to +150
C
1.0
2.0
3.0
4.0
5.0
0.5
1.0
1.5
2.0
0
FREQUENCY (GHz)
6.0
LOSS (dB)
REFERENCE INSERTION LOSS vs. FREQUENCY
ATTENUATION FLATNESS vs. FREQUENCY
1.0
0.5
0.0
-0.5
-1.0
0.5
1.0
1.5
2.0
31 dB
FREQUENCY (GHz)
0
1,2,4,8,16 dB
DEVIATION FROM
NOMINAL ATTENUATION (dB)
2.0
1.8
1.6
1.4
1.2
1.0
0
0.5
1.0
1.5
2.0
Insertion Loss and 1 dB Bit
Attenuation of 2 dB and Greater
VSWR
VSWR vs. FREQUENCY
FREQUENCY (GHz)
GaAs Digital Attenuator, 31dB, 5 Bit
AT-357
V3.00
M/A-COM, Inc.
North America:
Tel. (800) 366-2266
s
Asia/Pacific: Tel. +81 (03) 3226-1671
s
Europe: Tel. +44 (1344) 869 595
Fax (800) 618-8883
Fax +81 (03) 3226-1451
Fax +44 (1344) 300 020
2
Specifications Subject to Change Without Notice.
Absolute Maximum Ratings
1
Typical Performance
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