Digital Attenuator, 15.5 dB, 5-Bit,
TTL Driver, DC - 2 GHz
AT
-
283
CR-12
V 5.00
Electrical Specifications
1
: T
A
= 25C
Features
n
Attenuation: 0.5 dB Steps to 15.5 dB
2
n
Temperature Stability: 0.18 dB from 55C
to +85C Typical
n
Low DC Power Consumption
n
Hermetic Surface Mount Package
n
Integral TTL Driver
n
50 O Nominal Impedance
Description
M/A-COM's AT-283 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 is ideally suited for use where accuracy, fast
switching, very low power consumption and low
intermodulation products are required. Typical applications
include dynamic range setting in precision receiver circuits
and other gain/leveling control circuits. Environmental
screening is available. Contact the factory for information.
Parameter
Test Conditions
Units
Min
Typical
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
3
Any Single Bit DC-2.0 GHz
Any Combination of Bits DC-2.0 GHz
(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
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
4
Input Power 0.05 GHz
Input Power 0.5-2.0 GHz
dBm
dBm
--
--
+20
+28
--
--
Input IP
3
4
For two-tone input power 0.05 GHz
up to +5 dBm 0.5-2.0 GHz
dBm
dBm
--
--
+40
+47
--
--
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 O impedance at
all ports unless otherwise specified.
2.
Above reference insertion loss.
3.
This attenuator is guaranteed monotonic.
4.
V
EE
= -5.0V for the typical numbers given.
Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz
AT-283
Specifications subject to change without notice.
n
North America: Tel. (800) 366-2266
n
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
n
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
V 5.00
2
Parameter
Test Conditions
Units
Min
Typical
Max
Input IP
2
4
For two-tone input power 0.05 GHz
up to +5 dBm 0.5-2.0 GHz
dBm
dBm
--
--
+53
+68
--
--
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
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
A
A
--
--
--
--
1.0
1.0
V
CC
V
EE
--
--
V
V
4.5
-8.0
5.0
--
5.5
-5.0
Recommended PCB Layout
Absolute Maximum Ratings
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
-0.5V to V
CC
+ 0.5V
Operating Temperature
-55C to +125C
Storage Temperature
-65C to +150C
Note: Operation of this device above any on of these
parameters may cause permanent damage.
Truth Table
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
0 = TTL Low; 1 = TTL High
Functional Schematic (Top View)
Electrical Specifications
1
: T
A
= 25C
Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz
AT-283
Specifications subject to change without notice.
n
North America: Tel. (800) 366-2266
n
Asia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
n
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Visit www.macom.com for additional data sheets and product information.
V 5.00
Typical Performance Curves
Reference Insertion Loss vs.
3
Attenuation Accuracy vs. Frequency
0.5, 1, 2 dB Bits
Attenuation Accuracy vs. Frequency
4, 8 dB Bits and Full Attenuation
VSWR vs. Frequency
Reference Loss, 0.5, 1, 2 dB Bits
-0.5
-0.3
0.0
0.3
0.5
0
500
1000
1500
2000
Frequency (MHz)
Deviation from Nom. Atten. (dB)
1.0
1.2
1.4
1.6
1.8
2.0
0
500
1000
1500
2000
Frequency (MHz)
VSWR
-0.5
0.0
0.5
1.0
0
500
1000
1500
2000
Frequency (MHz)
Deviation from Nom. Atten. (dB)
Full Atten.
0.0
1.0
2.0
3.0
4.0
5.0
0
500
1000
1500
2000
Frequency (MHz)
Insertion Loss (dB)
+25C
-55C
+85C
VSWR vs. Frequency
4, 8 dB Bits and Full Attenuation
Ordering Information
5
Part Number
Package
AT-283 PIN
CR-12
5. Contact the factory for standard or custom screening
requirements.
1.0
1.2
1.4
1.6
1.8
2.0
0
500
1000
1500
2000
Frequency (MHz)
VSWR
PDF 
ZIP