• North America Tel: 800.366.2266 • Europe Tel: +353.21.244.6400
• India Tel: +91.80.43537383 • China Tel: +86.21.2407.1588
Visit www.macomtech.com for additional data sheets and prod uct information.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
changes to the product(s) or information contained herein without notice.
1
GaAs Digital Attenuator
31 dB, 5 - Bit, DC - 2 GHz
Rev. V4
AT-357
ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions
is considering for development. Performance is based on target specifications, simulated results,
and/or prototype measurements. Commitment to develop is not guaranteed.
PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
Commitment to produce in volume is not guaranteed.
C-46
Features
n Attenuation 1 dB Steps to 31 dB
n TTL Control Interface
n Hermetic Connectorized Housing
Description
Electrical Specifications 1: TA = -55°C to +85°C
Parameter Test Conditions Frequency Units Min Typ Max
Nominal Attenuation 2 1 dB Steps to 31 dB
Attenuation Accuracy DC - 1.0 GHz
1.0 - 2.0 GHz ± (0.2 dB +2% of Atten Setting in dB) dB)
± (0.2 dB +2% of Atten Setting in dB) dB)
VSWR DC - .025 GHz
.025 - 0.5 GHz
0.2 - 2.0 GHz
0.5 - 1.0 GHz
Ratio
Ratio
Ratio
Ratio
—
—
—
—
—
—
—
—
2.2:1
1.8:1
1.5:1
1.4:1
Reference Insertion Loss DC - 0.5 GHz
0.5 - 1.0 GHz
1.0 - 2.0 GHz
dB
dB
dB
—
—
—
—
—
—
5.5
6.0
6.5
Impedance — — Ohms — 50 —
Ton
Toff 50% CTL to 90% RF
50% CTL to 10% RF —
— ns
ns —
— 160
80 —
—
Trise
Tfall 10% RF to 90% RF
90% RF to 10% RF —
— ns
ns —
— 15
3 —
—
Transients Unfiltered — mV — 130 —
1 dB Compression Input Power 0.5 - 2.0 GHz
0.05 GHz dBm
dBm —
— 28
15 —
—
IP2 Two-Tone Input Power up to +5 dBm 0.5 - 2.0 GHz
0.05 GHz dBm
dBm —
— +55
+45 —
—
IP3 Two-Tone Input Power up to +5 dBm 0.5 - 2.0 GHz
0.05 GHz dBm
dBm —
— +47
+28 —
—
• North America Tel: 800.366.2266 • Europe Tel: +353.21.244.6400
• India Tel: +91.80.43537383 • China Tel: +86.21.2407.1588
Visit www.macomtech.com for additional data sheets and prod uct information.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
changes to the product(s) or information contained herein without notice.
2
GaAs Digital Attenuator
31 dB, 5 - Bit, DC - 2 GHz
Rev. V4
AT-357
ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions
is considering for development. Performance is based on target specifications, simulated results,
and/or prototype measurements. Commitment to develop is not guaranteed.
PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
Commitment to produce in volume is not guaranteed.
Functional Schematic (Top Vie w)
Absolute Maximum Ratings 4
4. Operation of this device above any one of these parameters
may cause permanent damage.
Parameter
Absolute Maximum
Max Input Power
0.05 GHz
0.5 - 2.0 GHz
+27 dBm
+32 dBm
Bias Votlage
+15V Supply (V+)
-12V Supply (V-)
-0.7V to +18V
-15V to +0.7V
Control Votlage (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
Parameter Test Conditions Frequency Units Min Typ Max
Bias Power +15 VDC
-12 VDC —
— mA
mA —
— —
— 5
3
Vin Low (0)
Vin High (1) 0.0 to 0.8V
2.4 to 5.0V —
— µA
µA —
— —
— 1
1
Electrical Specifications 1: TA = -55°C to +85°C
Truth Table
Control Input Attenuation
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)
RF1 RF2
16 dB
8 dB
4 dB
2 dB
1 dB
C1 C2 C3 C4 C5
+15V -12V
GND
GND
GND
GND
• North America Tel: 800.366.2266 • Europe Tel: +353.21.244.6400
• India Tel: +91.80.43537383 • China Tel: +86.21.2407.1588
Visit www.macomtech.com for additional data sheets and prod uct information.
M/A-COM Technology Solutions Inc. and its affiliates reserve the right to make
changes to the product(s) or information contained herein without notice.
3
GaAs Digital Attenuator
31 dB, 5 - Bit, DC - 2 GHz
Rev. V4
AT-357
ADVANCED: Data Sheets contain information regarding a product M/A-COM Technology Solutions
is considering for development. Performance is based on target specifications, simulated results,
and/or prototype measurements. Commitment to develop is not guaranteed.
PRELIMINARY: Data Sheets contain information regarding a product M/A-COM Technology
Solutions has under development. Performance is based on engineering tests. Specifications are
typical. Mechanical outline has been fixed. Engineering samples and/or test data may be available.
Commitment to produce in volume is not guaranteed.
Typical Performance Curves
Ref. Insertion Loss vs. Frequency Attenuation Flatness vs. Frequency
VSWR vs. Frequency Ordering Information
Part Number Package
AT-357 SMA C-46
1
2
3
4
5
6
0.00 0.25 0.50 0.75 1.00
Frequency (GHz)
L oss (dB )
-1
-0.5
0
0.5
1
0.00 0.25 0.50 0.75 1.00
Freque nc y ( G Hz)
Deviation from Nominal
A ttenu ati o n (d B)
3 1 d B 1, 2, 4 , 8 , 16 d B
1.0 0
1.2 0
1.4 0
1.6 0
1.8 0
2.00
0.00 0.50 1.00 1.50 2.00
Fre que nc y ( G Hz)
VSWR
Insert io n Lo ss and 1 d B B it
A tt enuatio n o f 2 dB and Greate
r
