Digital Attenuator, 31 dB, 5-Bit,
TTL Driver, DC - 2 GHz
AT20
-
0263
CR-12
V 3.00
Features
n
Attenuation: 1 dB steps to 31 dB
n
Temperature Stability: 0.18 dB from 40C to +85C
Typical
n
Low DC Power Consumption
n
Surface Mount Package
n
Integral TTL Driver
n
Low Cost/High Performance
n
50 Ohm Nominal Impedance
Description
M/A-COM's AT20-0263 is a GaAs FET 5-bit digital
attenuator with a 1 dB minimum step size and 31 dB total
attenuation. This attenuator and integral TTL driver is in a
ceramic 16-lead surface mount package. The AT20-0263 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. Available with enhanced performance as
fully hermetic version. Environmentally screenable as P/N
AT-263.
Electrical Specifications: T
A
= 25C
1
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
2.2
2.5
2.4
2.8
3.0
Attenuation Accuracy
2
Any Single Bit
Any Combination of Bits
DC - 1.0 GHz
DC - 2.0 GHz
(0.25 +3% of atten setting in dB) dB
(0.25 +3% of atten setting in dB) dB
or 0.4 dB, whichever is greater
VSWR
--
DC - 2.0 GHz
Ratio
--
--
1.6:1
Trise, Tfall
10% to 90%
--
ns
--
50
--
Ton, Toff
50% Control to 90/10% RF
--
ns
--
150
--
Transients
In-Band (peak-peak)
--
mV
--
50
--
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
+48
--
--
Input IP2
For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
--
--
+45
+68
--
--
Vcc
--
--
V
4.5
5.0
5.5
Vee
--
--
V
-8.0
--
-5.0
1. All specifications apply when operated with bias voltages of +5V for Vcc and 5.0V for Vee.
2. This attenuator is guaranteed monotonic.
Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 2 GHz
AT20-0263
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
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
Electrical Specifications: T
A
= 25C
Absolute Maximum Ratings
3
3. Operation of this device above any one of these parameters
may cause permanent damage.
4. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.
Parameter
Absolute Maximum
Max Input Power
0.5 GHz
0.5 - 2.0 GHz
+27 dBm
+34 dBm
Supply Voltages
Vcc
Vee
+5.5V
-8.5V
Control Voltage
4
-0.5V to Vcc +0.5V
Operating Temperature
-40C to +125C
Storage Temperature
-65C to +150C
Truth Table
Control Inputs
C5
C4
C3
C2
C1
Attenuation
0
0
0
0
0
Reference
0
0
0
0
1
1 dB
0
0
0
1
0
2 dB
0
0
1
0
0
4 dB
0
1
0
0
0
8 dB
1
0
0
0
0
16 dB
1
1
1
1
31 dB
1
Functional Schematic (Top View)
0 = TTL Low 1 = TTL High
C5
+5V
-5V
C4
C3
C2
RF2
GND
GND
GND
GND
16 dB
8 dB
4 dB
2 dB
1 dB
GND
GND Orientation Mark
RF1 PIN 1
C1
PIN 16 GND
Digital Attenuator, 31 dB, 5-Bit, TTL Driver, DC - 2 GHz
AT20-0263
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
AT20-0263
CR-12
-1.5
-1
-0.5
0
0.5
0.0
0.5
1.0
1.5
2.0
Frequency (GHz)
Deviation from Nominal Atten (dB)
1,2,4,8,16 dB
Full Attenuation
1.00
1.20
1.40
1.60
1.80
2.00
0.00
0.50
1.00
1.50
2.00
Frequency (GHz)
VSWR
4 dB State
1 dB State
0
1
2
3
4
5
0.0
0.5
1.0
1.5
2.0
Frequency (GHz)
Loss (dB)
+85C
+25C
-55C
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