Digital Attenuator, 30 dB, 4-Bit,
DC - 2 GHz
AT
-
232
CR-6
V 3.00
Features
n
Attenuation: 2 dB steps to 30 dB
n
Temperature Stability: 0.18 dB from 55C to +85C
Typical
n
Low DC Power Consumption
n
Hermetic Surface Mount Package
n
Fast Switching Speed, 12 ns Typical
n
50 Ohm Nominal Impedance
Description
M/A-COM's AT-232 is a GaAs FET 4-bit digital attenuator
with a 2 dB minimum step size and 30 dB total attenuation.
This attenuator is in a hermetically sealed ceramic 16-lead
surface mount package. The AT-232 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 Specifications
1
(From 55C to +85C)
Parameter
Test Conditions
Frequency
Units
Min
Typ
Max
Reference Insertion Loss
--
DC - 0.5 GHz
DC - 1.0 GHz
DC - 2.0 GHz
dB
dB
dB
--
--
--
--
--
--
2.0
2.3
2.5
Attenuation Accuracy
2
Any Single Bit
Any Combination of Bits
DC - 1.0 GHz
DC - 2.0 GHz
DC - 1.0 GHz
DC - 2.0 GHz
(0.15 dB +3% of atten setting in dB) dB
(0.2 dB +3% of atten setting in dB) dB
Or 0.45 dB, whichever is greater
(0.22 dB +3% of atten setting in dB) dB
(0.25 dB +4% of atten setting in dB) dB
Or 0.45 dB, whichever is greater
VSWR
--
DC - 2.0 GHz
Ratio
--
--
1.6:1
Trise, Tfall
10% to 90%
--
ns
--
12
--
Ton, Toff
50% Control to 90/10% RF
--
ns
--
18
--
Transients
In-Band (peak-peak)
--
mV
--
25
--
1 dB Compression
Input Power
Input Power
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
--
--
+20
+28
--
--
Input IP3
For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
--
--
+40
+50
--
--
Input IP2
For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
--
--
+45
+68
--
--
1. All specifications apply when operated with control votlages of 0.0V to -5.0V.
2. This attenuator is guaranteed monotonic.
Digital Attenuator, 30 dB, 4-Bit, DC - 2 GHz
AT-232
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 3.00
2
Parameter
Test Conditions
Frequency
Units
Min
Typ
Max
Input Leakage Current (Low)
-0.2 to 0V
--
A
--
--
20
Input Leakage Current (High)
-8.0 to -5.0V
--
A
--
--
200
Electrical Specifications (From 55C to +85C)
Absolute Maximum Ratings
3
3. 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
+34 dBm
Control Voltage
+0.5V, -8.5V
Operating Temperature
-55C to +125C
Storage Temperature
-65C to +150C
Functional Schematic (Top View)
Truth Table
/VC4 VC4 /VC3 VC3 /VC2 VC2 /VC1 VC1
Atten.
(dB)
-5V
0V
-5V
0V
-5V
0V
-5V
0V
Ref.
0V
-5V
-5V
0V
-5V
0V
-5V
0V
2 dB
-5V
0V
0V
-5V
-5V
0V
-5V
0V
4 dB
-5V
0V
-5V
0V
0V
-5V
-5V
0V
8 dB
-5V
0V
-5V
0V
-5V
0V
0V
-5V
16 dB
0V
-5V
0V
-5V
0V
-5V
0V
-5V
30 dB
Control Inputs
VC1
/VC1
VC2
/VC2
VC3
/VC3
VC4
/VC4
RF1
GND
GND
GND
GND
GND
GND Orientation Mark
RF2
16 dB
8 dB
4 dB
2 dB
Digital Attenuator, 30 dB, 4-Bit, DC - 2 GHz
AT-232
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 3.00
Typical Performance Curves
Attenuation Accuracy vs. Frequency
Ref. Insertion Loss vs. Frequency
VSWR vs. Frequency
3
Ordering Information
Part Number
Package
AT-232 PIN
CR-6
0
1
2
3
4
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
Insertion Loss (dB)
+85C
+25C
-55C
1.0
1.1
1.2
1.3
1.4
1.5
1.6
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
VSWR
2 dB
4 dB 8 dB
16 dB 30 dB
Insertion Loss
-1.00
-0.50
0.00
0.50
1.00
1.50
2.00
2.50
3.00
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
Deviation from Nominal Atten
(dB)
2 dB
4 dB
8 dB
16 dB
30 dB
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