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GaAs Digital Attenuator, 31 dB, 5 Bit DC - 2 GHz
0.000 0.115 (2.92) 0.23 Ref (5.8) 0.000 0.070 (1.78)
AT-357
V3.00
q q q
Attenuation 1 dB Steps to 31 dB TTL Control Interface Hermetic Connectorized Housing
(
.093.005 Dia Thru (2.36 0.13) 4 Places
1.375 (34.92)
Features
C-46
Guaranteed Specifications1 p
Frequency Range Nominal Attenuation 2 Attenuation Accuracy DC - 1.0 GHz 1.0 - 2.0 GHz VSWR
(-55C to +85C) )
DC to 2.0 GHz 1 dB Steps to 31 dB
0.000 0.330 (8.38)
0.000 0.205 (5.21)
Removable SMA Jack Receptacle 2 Places
0.250 (6.35)
0.660 (16.76) 1.235 .005 (31.37 0.13) 0.230 (5.84) 0.115 (2.92) 0.000
0.250 (6.35)
(0.2 dB + 2% of Attenuation Setting in dB) dB (0.2 dB + 2% of Attenuation Setting in dB) dB DC - .025 GHz .025 - 0.5 GHz 0.2 - 2.0 GHz 0.5 - 1.0 GHz DC - 0.5 GHz 0.5 - 1.0 GHz 1.0 - 2.0 GHz 2.2:1 Max 1.8:1 Max 1.5:1 Max 1.4:1 Max 5.5 dB Max 6.0 dB Max 6.5 dB Max
0.20 (5.1) Typ
Reference Insertion Loss
0.090 (2.29) 10 Places .025 .005 Dia Pin (0.64 0.13) 0.900 Ref. 11 Places (22.86)
Operatingg Characteristics p
Impedance Switching Characteristics Ton, (50% CTL to 90% RF) Toff (50% CTL to 10% RF) Trise, (10% RF to 90% RF) Tfall (90% RF to 10% RF) Switching Transients (unfiltered) Input Power for 1 dB Compression 0.5 - 2.0 GHz 0.05 GHz 50 Ohms Nominal 160 ns Typ 80 ns Typ 15 ns Typ 3 ns Typ 130 mV Typ 28 dBm Typ 15 dBm Typ
Bottom of case is AC ground. Dimensions in ( ) are in mm. Unless Otherwise Noted: .xxx = 0.010 (.xx = 0.25) .xx = 0.02 (.x = 0.5)
Functional Schematic (Top View)
1 dB 2 dB 4 dB 8 dB 16dB
RF1
RF2
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 Control Vin Low (0) Vin High (1) +15 VDC @ 5 mA Max -12 VDC @ 3 mA Max 5 line, TTL Data Bus 0.0 to 0.8V @ 1 A Max 2.4 to 5.0V @ 1 A Max
+15V C1 GND GND GND GND -12V C2 C3 C4 C5
Truth Table
Control Input C1 0 1 0 0 0 0 C2 C3 C4 0 0 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 Any Combination "1" = Logic High (TTL) C5 0 0 0 0 0 1 Attenuator Setting REFERENCE 1 dB 2 dB 4 dB 8 dB 16 dB Sum of Bits Selected "0" = Logic Low (TTL)
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.
Ordering Information
Model No. AT-357 SMA Package Connectorized
Specifications Subject to Change Without Notice.
M/A-COM, Inc.
North America: Tel. (800) 366-2266 Fax (800) 618-8883
s
1
Asia/Pacific: Tel. +81 (03) 3226-1671 Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020
GaAs Digital Attenuator, 31dB, 5 Bit Absolute Maximum Ratings 1
Parameter Max. Input Power 0.05 GHz 0.5 - 2.0 GHz Bias Voltage +15V Supply (V+) -12V Supply (V-) Control Voltage Operating Temperature Storage Temperature Absolute Maximum1 +27 dBm +32 dBm -0.7V to + 18V -15V to + 0.7V (V-)-2V to (V+)+2V (or 30 mA, whichever comes first) -55C to +125C -65C to +150C
AT-357
V3.00
Note: 1. Operation of this device above any one of these parameters may cause permanent damage.
Typical Performance
ATTENUATION FLATNESS vs. FREQUENCY DEVIATION FROM NOMINAL ATTENUATION (dB) 1.0 31 dB 0.5 LOSS (dB) 1.0 2.0 3.0 4.0 5.0 6.0 2.0 REFERENCE INSERTION LOSS vs. FREQUENCY
0.0 1,2,4,8,16 dB -0.5 -1.0 0 0.5 1.0 FREQUENCY (GHz) 1.5
0
0.5
1.0 FREQUENCY (GHz)
1.5
2.0
VSWR vs. FREQUENCY 2.0 1.8 Insertion Loss and 1 dB Bit VSWR 1.6 Attenuation of 2 dB and Greater 1.4 1.2 1.0
0
0.5
1.0 1.5 FREQUENCY (GHz)
2.0
Specifications Subject to Change Without Notice.
2
North America: Tel. (800) 366-2266 Fax (800) 618-8883
s
M/A-COM, Inc.
Asia/Pacific: Tel. +81 (03) 3226-1671 Fax +81 (03) 3226-1451
s
Europe: Tel. +44 (1344) 869 595 Fax +44 (1344) 300 020

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