MA-COM AT-283

AT-283
Digital Attenuator, 15.5 dB, 5-Bit,
TTL Driver, DC - 2 GHz
Features
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V 5.00
CR-12
Attenuation: 0.5 dB Steps to 15.5 dB2
Temperature Stability: ± 0.18 dB from –55°C
to +85°C Typical
Low DC Power Consumption
Hermetic Surface Mount Package
Integral TTL Driver
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.
Electrical Specifications1: TA = 25°C
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
± (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
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
—
—
—
dBm
dBm
—
—
+20
+28
—
—
dBm
dBm
—
—
+40
+47
—
—
Input IP3 4
2.
3.
4.
DC-2.0 GHz
DC-2.0 GHz
VSWR
1 dB Compression 4
1.
Any Single Bit
Any Combination of Bits
Input Power
Input Power
0.05 GHz
0.5-2.0 GHz
For two-tone input power
up to +5 dBm
0.05 GHz
0.5-2.0 GHz
All specifications apply when operated with bias voltages of +5.0V for VCC and –5.0V to -8.0V for VEE, and 50 O impedance at
all ports unless otherwise specified.
Above reference insertion loss.
This attenuator is guaranteed monotonic.
VEE = -5.0V for the typical numbers given.
Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz
AT-283
V 5.00
Electrical Specifications1: TA = 25°C
Parameter
Input IP2
Test Conditions
4
For two-tone input power
up to +5 dBm
0.05 GHz
0.5-2.0 GHz
Units
Min
Typical
Max
dBm
dBm
—
—
+53
+68
—
—
VCC
VEE
—
—
V
V
4.5
-8.0
5.0
—
5.5
-5.0
ICC
VCC = 4.5 to 5.5V
Vctl = 0 to 0.8V, or VCC - 2.1V to VCC
mA
—
—
5.0
IEE
VEE = -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
Truth Table
Recommended PCB Layout
Control Inputs
C4
C5
0
0
C1
0
C2
0
C3
0
Attenuation
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)
Absolute Maximum Ratings
Parameter
Absolute Maximum
Maximum Input Power
0.05 GHz
0.5-2.0 GHz
+27 dBm
+34 dBm
Supply Voltages
VCC
VEE
+5.5V
-8.5V
Control Voltage
-0.5V to VCC + 0.5V
Operating Temperature
-55°C to +125°C
Storage Temperature
-65°C to +150°C
Note: Operation of this device above any on of these
parameters may cause permanent damage.
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.
2
Digital Attenuator, 15.5 dB, 5-Bit, TTL Driver, DC - 2 GHz
AT-283
V 5.00
Typical Performance Curves
Attenuation Accuracy vs. Frequency
0.5, 1, 2 dB Bits
Reference Insertion Loss vs.
+85°C
+25°C
-55°C
Deviation from Nom. Atten. (dB)
Insertion Loss (dB)
5.0
4.0
3.0
2.0
1.0
0.0
0
500
1000
1500
2000
0.5
0.3
0.0
-0.3
-0.5
0
500
Frequency (MHz)
1000
1500
2000
Frequency (MHz)
VSWR vs. Frequency
Reference Loss, 0.5, 1, 2 dB Bits
Attenuation Accuracy vs. Frequency
4, 8 dB Bits and Full Attenuation
2.0
1.8
0.5
VSWR
Deviation from Nom. Atten. (dB)
Full Atten.
1.0
1.6
1.4
0.0
1.2
1.0
-0.5
0
500
1000
1500
2000
0
500
1500
2000
Frequency (MHz)
Frequency (MHz)
VSWR vs. Frequency
4, 8 dB Bits and Full Attenuation
Ordering Information 5
2.0
1.8
VSWR
1000
Part Number
Package
AT-283 PIN
CR-12
1.6
5. Contact the factory for standard or custom screening
requirements.
1.4
1.2
1.0
0
500
1000
1500
2000
Frequency (MHz)
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.
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