Digital Attenuator, 31 dB, 5-Bit,
TTL Driver, DC - 2 GHz
V 3.00
AT-263
Features
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Attenuation: 1 dB steps to 31 dB
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Temperature Stability: ± 0.18 dB from –55°C to +85°C
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CR-12
Typical
Low DC Power Consumption
Hermetic Surface Mount Package
Integral TTL Driver
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 –55°C to +85°C)
Parameter
Reference Insertion Loss
Test Conditions
—
Frequency
DC - 0.5 GHz
DC - 1.0 GHz
DC - 2.0 GHz
DC - 1.0 GHz
DC - 2.0 GHz
DC - 2.0 GHz
—
—
—
0.05 GHz
0.5 - 2.0 GHz
0.05 GHz
0.5 - 2.0 GHz
0.05 GHz
0.5 - 2.0 GHz
—
—
Units
dB
dB
dB
Min
—
—
—
Typ
—
—
—
Max
2.4
2.8
3.0
Attenuation Accuracy
2
Any Single Bit
Any Combination of Bits
—
10% to 90%
50% Control to 90/10% RF
In-Band (peak-peak)
Input Power
Input Power
For two-tone Input Power
Up to +5 dBm
For two-tone Input Power
Up to +5 dBm
—
—
± (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
Ratio
ns
ns
mV
dBm
dBm
dBm
dBm
dBm
dBm
V
V
—
—
—
—
—
—
—
—
—
—
4.5
-8.0
—
9
40
30
+20
+28
+40
+48
+45
+68
5.0
—
1.6:1
—
—
—
—
—
—
—
—
—
5.5
-5.0
VSWR
Trise, Tfall
Ton, Toff
Transients
1 dB Compression
Input IP3
Input IP2
Vcc
Vee
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
V 3.00
Electrical Specifications (From –55°C to +85°C)
Parameter
Icc
Iee
Vctl
Vctl
Input Leakage Current (Low)
Input Leakage Current (High)
Test Conditions
Vcc = 4.5 to 5.5V
Vctl = 0 to 0.8V, or Vcc –2.1V to Vcc
Vee = -5.0 to -8.0V
Logic 0 (TTL)
Logic 1 (TTL)
0 to 0.8V
2.0 to 5.0V
Frequency
—
—
—
—
—
—
Units
mA
mA
V
V
µA
µA
Min
—
—
0.0
2.0
—
—
Typ
—
—
—
—
—
—
Max
5.0
1.0
0.8
5.0
1.0
1.0
Absolute Maximum Ratings
3
Parameter
Max Input Power
0.5 GHz
0.5 - 2.0 GHz
Supply Voltages
Vcc
Vee
Control Voltage
4
Operating Temperature
Storage Temperature
Absolute Maximum
Truth Table
Control Inputs
C5
C4
0
0
0
0
1
0
1
C3
0
0
0
1
0
0
1
C2
0
0
1
0
0
0
1
C1
0
1
0
0
0
0
1
Attenuation
Reference
1 dB
2 dB
4 dB
8 dB
16 dB
31 dB
+27 dBm
+34 dBm
+5.5V
-8.5V
-0.5V to Vcc +0.5V
-55°C to +125°C
-65°C to +150°C
0
0
0
0
0
1
1
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.
0 = TTL Low
1 = TTL High
Functional Schematic (Top View)
C5
16 dB
RF2
GND
8 dB
+5V
-5V
C4
C3
C2
C1
1 dB
2 dB
GND
GND
GND
GND
GND Orientation Mark
RF1 PIN 1
4 dB
PIN 16 GND
Specifications subject to change without notice.
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North America:
Tel. (800) 366-2266
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Asia/Pacific:
Tel.+81-44-844-8296, Fax +81-44-844-8298
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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, 31 dB, 5-Bit, TTL Driver, DC - 2 GHz
Typical Performance Curves
AT-263
V 3.00
Ref. Insertion Loss vs. Frequency
+85°C
5
4
+25°C
-55°C
Attenuation Accuracy vs. Frequency
Deviation from Nominal Atten (dB)
1,2,4,8,16 dB
0.5
Full Attenuation
0
Loss (dB)
3
2
1
0
0.0
0.5
1.0
1.5
2.0
-0.5
-1
-1.5
0.0
0.5
1.0
1.5
2.0
Frequency (GHz)
Frequency (GHz)
VSWR vs. Frequency
4 dB State
2.00
1.80
1 dB State
Ordering Information
Part Number
AT-263 PIN
Package
CR-12
VSWR
1.60
1.40
1.20
1.00
0.00
0.50
1.00
1.50
2.00
Frequency (GHz)
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.
3
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