Digital Attenuator, 31 dB, 5-Bit,
TTL Driver, DC - 2 GHz
AT
-
263
CR-12
V 3.00
Features
n
Attenuation: 1 dB steps to 31 dB
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 Ohm Nominal Impedance
Description
M/A-COM's AT-263 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
hermetically sealed ceramic 16-lead surface mount package.
The AT-263 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
--
--
--
--
--
--
2.4
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
--
9
--
Ton, Toff
50% Control to 90/10% RF
--
ns
--
40
--
Transients
In-Band (peak-peak)
--
mV
--
30
--
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
AT-263
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
Vctl
Vctl
Logic 0 (TTL)
Logic 1 (TTL)
--
--
V
V
0.0
2.0
--
--
0.8
5.0
Input Leakage Current (Low)
0 to 0.8V
--
A
--
--
1.0
Input Leakage Current (High)
2.0 to 5.0V
--
A
--
--
1.0
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.
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
-55C 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
0 = TTL Low 1 = TTL High
Functional Schematic (Top View)
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
AT-263
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
3
Ordering Information
Part Number
Package
AT-263 PIN
CR-12
Attenuation Accuracy vs. Frequency
Ref. Insertion Loss vs. Frequency
VSWR vs. Frequency
-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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