Digital Attenuator
15.5 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT-283-PIN
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V6
1
RoHS
Compliant
Features
• Attenuation: 0.5 dB Steps to 15.5 dB
• Temperature Stability: ± 0.18 dB from –55°C
to +85°C Typical
• Low DC Power Consumption
• Hermetic Surface Mount Package
• Integral TTL Driver
• 50 Ω Nominal Impedance
• Lead-Free CR-12 Package
• 260°C Reflow Compatible
Description
M/A-COM’s AT-283-PIN is a GaAs FET 5-bit digital
attenuator with a 0.5 dB minimum step size and 15.5
dB total attenuation. This attenuator and integral
TTL driver is in a hermetically sealed ceramic 16
lead surface mount package. The AT-283-PIN is
ideally suited for use where accuracy, fast switching,
very low power consumption and low intermodula-
tion products are required. Typical applications in-
clude dynamic range setting in precision receiver
circuits and other gain/leveling control circuits. Envi-
ronmental screening is available. Contact the fac-
tory for information.
Ordering Information
Part Number Package
AT-283-PIN Bulk Packaging
MAAD-007229-0001TR 1000 piece reel
MAAD-007229-0001TB Sample Test Board
Note: Reference Application Note M513 for reel size
information.
Note: Die quantity varies.
Functional Schematic
Pin Configuration
Pin No. Function Pin No. Function
1 RF1 9 C5
2 GND 10 +5V
3 GND 11 -5V
4 GND 12 C4
5 GND 13 C3
6 GND 14 C2
7 GND 15 C1
8 RF2 16 GND
* Restrictions on Hazardous Substances, European Union Directive 2002/95/EC.
The metal bottom of the case must be connected to RF and DC
ground.
Digital Attenuator
15.5 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT-283-PIN
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V6
2
RoHS
Compliant
Electrical Specifications: T
A
= 25°C
1
Parameter Test Conditions Units Min Typ Max
Reference
Insertion Loss
DC-0.5 GHz
DC-1.0 GHz
DC-2.0 GHz
dB
dB
dB
—
—
—
—
—
—
2.2
2.5
2.9
Attenuation Accuracy
2
Any Single Bit DC-2.0 GHz
Any Combination of Bits DC-2.0 GHz
VSWR DC-1.0 GHz
DC-2.0 GHz
—
—
—
—
—
—
1.6:1
1.7:1
Trise, Tfall
Ton, Toff
Transients
10% to 90%
50% Control to 90/10% RF
In-band (peak—peak)
nS
nS
mV
—
—
—
10
27
22
—
—
—
1 dB Compression
3
Input Power 0.05 GHz
Input Power 0.5-2.0 GHz
dBm
dBm
—
—
+20
+28
—
—
Input IP
3
3
For two-tone input power 0.05 GHz
up to +5 dBm 0.5-2.0 GHz
dBm
dBm
—
—
+40
+47
—
—
Input IP
2
3
For two-tone input power 0.05 GHz
up to +5 dBm 0.5-2.0 GHz
dBm
dBm
—
—
+53
+68
—
—
V
CC
V
EE
—
—
V
V
4.5
-8.0
5.0
—
5.5
-5.0
I
CC
V
CC
= 4.5 to 5.5V
Vctl = 0 to 0.8V, or V
CC
- 2.1V to V
CC
mA — — 5.0
± (0.25 +3% of attenuation setting in dB) dB
± (0.25 +3% of attenuation setting in dB) dB
or ± 0.4 dB, whichever is greater
I
EE
V
EE
= -5.0 to –8.0V mA — — 1.0
Vctl
Vctl
Logic 0 (TTL)
Logic 1 (TTL)
V
V
0.0
2.0
—
—
0.8
5.0
Input Leakage Current (Low)
Input Leakage Current (High)
0 to 0.8V
2.0 to 5.0V
µA
µA
—
—
—
—
1.0
1.0
1. All specifications apply when operated with bias voltages of +5.0V for V
CC
and –5.0V to -8.0V for V
EE
, and 50 Ω impedance at all ports
unless otherwise specified.
2. This attenuator is guaranteed monotonic.
3. V
EE
= -5.0V for the typical numbers given.
Digital Attenuator
15.5 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT-283-PIN
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V6
3
RoHS
Compliant
Recommended PCB Configuration
Absolute Maximum Ratings
4,5
Parameter Absolute Maximum
Maximum Input Power
0.05 GHz
0.5-2.0 GHz
+27 dBm
+34 dBm
Supply Voltages
V
CC
V
EE
+5.5V
-8.5V
Control Voltage
6
-0.5V to V
CC
+ 0.5V
Operating Temperature -55°C to +125°C
Storage Temperature -65°C to +150°C
4. Exceeding any one or combination of these limits may cause
permanent damage to this device.
5. M/A-COM does not recommend sustained operation near
these survivability limits.
6. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.
Handling Procedures
Please observe the following precautions to avoid
damage:
Static Sensitivity
Gallium Arsenide Integrated Circuits are sensitive
to electrostatic discharge (ESD) and can be
damaged by static electricity. Proper ESD control
techniques should be used when handling these
devices.
Truth Table (Digital Attenuator)
Control Inputs
C1 C2 C3 C4 C5 Attenuation
0 0 0 0 0 Reference
1 0 0 0 0 0.5 dB
0 1 0 0 0 1 dB
0 0 1 0 0 2 dB
0 0 0 1 0 4 dB
0 0 0 0 1 8 dB
1 1 1 1 1 15.5 dB
Attenuation Accuracy vs. Frequency 0.5, 1, 2 dB Bits
Typical Performance Curves
Reference Insertion Loss vs. Frequency @ Temperature
0.0
1.0
2.0
3.0
4.0
5.0
0 500 1000 1500 2000
Frequency (MHz)
Insertion Loss (dB)
+ 2 5 °C - 5 5
°C
+ 8 5 °C
- 0.5
- 0.3
0.0
0.3
0.5
0 500 1000 1500 2000
Frequency (MHz)
Deviation from Nom. Atten. (dB)
0 = TTL Low; 1 = TTL High
Digital Attenuator
15.5 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT-283-PIN
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V6
4
RoHS
Compliant
VSWR vs. Frequency Reference Loss, 0.5, 1, 2 dB Bits
VSWR vs. Frequency 4, 8 dB Bits and Full Attenuation
Typical Performance Curves
Attenuation Accuracy vs. Frequency 4, 8 dB Bits and
Full Attenuation
- 0.5
0.0
0.5
1.0
0 500 1000 1500 2000
Frequency (MHz)
Deviation from Nom. Atten. (dB)
Fu ll Atte n.
1.0
1.2
1.4
1.6
1.8
2.0
0 500 1000 1500 2000
Frequency (MHz)
VSWR
1.0
1.2
1.4
1.6
1.8
2.0
0 500 1000 1500 2000
Frequency (MHz)
VSW R
Lead-Free,
CR-12 Ceramic Package
†
†
Reference Application Note M538 for lead-free solder reflow
recommendations.
