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 Specifications
1
p
Frequency Range
Nominal Attenuation
2
Attenuation Accuracy
DC – 1.0 GHz
1.0 – 2.0 GHz
VSWR
(-55°C to +85°C)
)
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)
Operating
g
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
µA
Max
2.4 to 5.0V @ 1
µA
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 Maximum
1
+27 dBm
+32 dBm
-0.7V to + 18V
-15V to + 0.7V
(V-)-2V to (V+)+2V
(or 30 mA, whichever comes first)
-55°C to +125°C
-65°C to +150°C
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
工控电子
