Digital Attenuator, 32 dB, 2-Bit,
TTL Driver, DC - 2 GHz
AT20
-
0273
CR-11
V 3.00
Features
n
Attenuation: 16 dB steps to 32 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 AT20-0273 is a GaAs FET digital
attenuator with a 16 dB minimum step size and 32 dB total
attenuation. This attenuator and integral TTL driver is in a
sealed ceramic 16-lead surface mount package. The
AT20-0273 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-273.
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
--
--
--
1.2
1.3
1.5
1.6
1.7
1.9
Attenuation Accuracy
2
C1 Bit
Full Attenuation (32 dB)
DC - 2.0 GHz
DC - 0.5 GHz
DC - 1.0 GHz
DC - 2.0 GHz
3% of attenuation setting in dB
3% of attenuation setting in dB
3% of attenuation setting in dB, -1 dB
3% of attenuation setting in dB, -3 dB
VSWR
--
DC - 2.0 GHz
Ratio
--
--
1.4:1
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
--
--
+38
+48
--
--
Input IP2
For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
--
--
+44
+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, 32 dB, 2-Bit, TTL Driver, DC - 2 GHz
AT20-0273
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
--
--
2.0
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
0 = TTL Low 1 = TTL High
C2
C1
Attenuation
0
0
Reference
0
1
16 dB
1
0
32 dB
Control Input
Functional Schematic (Top View)
5
RF1
GND
GND
GND
Vee
Vcc
RF2
GND
GND
GND
GND
16 dB
16 dB
C1
GND Orientation Mark
C2 PIN 1
NC
PIN 16 NC
5. Use the C1 control for a single 16-dB bit.
Digital Attenuator, 32 dB, 2-Bit, TTL Driver, DC - 2 GHz
AT20-0273
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
AT20-0273
CR-11
0
1
2
3
4
5
0.0
0.5
1.0
1.5
2.0
2.5
3
Frequency (GHz)
Loss (dB)
+85C
+25C
-55C
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
Deviation from Nominal Atten (dB)
Full Attenuation
16 dB bit
1.00
1.20
1.40
1.60
1.80
2.00
0.0
0.5
1.0
1.5
2.0
2.5
3.0
Frequency (GHz)
VSWR
16 dB State
32 dB State
Full Attenuation
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