Digital Attenuator
31.0 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT20-0263
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V4
1
RoHS
Compliant
Features
• Attenuation: 1 dB steps to 31 dB
• Temperature Stability: ± 0.18 dB from –40°C to
+85°C Typical
• Low DC Power Consumption
• Surface Mount Package
• Integral TTL Driver
• Low Cost/High Performance
• 50 Ohm Nominal Impedance
• Lead-Free CR-12 Package
• 260°C Reflow Compatible
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 pack-
age. The AT20-0263 is ideally suited for use where
accuracy, fast switching, very low power consump-
tion 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 perform-
ance as fully hermetic version. Environmentally
screenable as P/N AT-263-PIN.
Ordering Information
Part Number Package
AT20-0263 Bulk Packaging
Note: Reference Application Note M513 for reel size
information.
Note: Die quantity varies.
Functional Schematic
Pin Configuration
Pin No. Function Pin No. Function
1 RF1 9 C5
2 GND 10 +5V
3 GND 11 -5V
4 GND 12 C4
5 GND 13 C3
6 GND 14 C2
7 GND 15 C1
8 RF2 16 GND
* Restrictions on Hazardous Substances, European Union Directive 2002/95/EC.
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
The metal bottom of the case must be connected to RF and DC
ground.
Digital Attenuator
31.0 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT20-0263
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V4
2
RoHS
Compliant
Electrical Specifications: T
A
= 25°C
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
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
1. All specifications apply when operated with bias voltages of +5V for Vcc and –5.0V for Vee.
2. This attenuator is guaranteed monotonic.
Absolute Maximum Ratings
3,4
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
5
-0.5V to Vcc +0.5V
Operating Temperature -40°C to +125°C
Storage Temperature -65°C to +150°C
3. Exceeding any one or combination of these limits may cause
permanent damage to this device.
4. M/A-COM does not recommend sustained operation near
these survivability limits.
5. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.
Recommended PCB Configuration
Digital Attenuator
31.0 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT20-0263
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V4
3
RoHS
Compliant
Handling Procedures
Please observe the following precautions to avoid
damage:
Static Sensitivity
Gallium Arsenide Integrated Circuits are sensitive
to electrostatic discharge (ESD) and can be
damaged by static electricity. Proper ESD control
techniques should be used when handling these
devices.
Truth Table (Digital Attenuator)
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
Attenuation Accuracy vs. Frequency
VSWR vs. Frequency
Typical Performance Curves
Ref. Insertion Loss vs. Frequency
0
1
2
3
4
5
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
Loss (dB)
+ 8 5 °C + 2 5
°C
- 5 5 °C
- 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 d B Full Atte nu a tio n
1.00
1.20
1.40
1.60
1.80
2.00
0.00 0.50 1.00 1.50 2.00
Frequency (GHz)
VSW R
4 dB S ta te 1 d B S ta te
Digital Attenuator
31.0 dB, 5-Bit, TTL Driver, DC-2.0 GHz
AT20-0263
M/A-COM Inc. and its affiliates reserve the right to make changes to the
product(s) or information contained herein without notice. M/A-COM makes
no warranty, representation or guarantee regarding the suitability of its
products for any particular purpose, nor does M/A-COM assume any liability
whatsoever arising out of the use or application of any product(s) or
information.
• North America Tel: 800.366.2266 / Fax: 978.366.2266
• Europe Tel: 44.1908.574.200 / Fax: 44.1908.574.300
• Asia/Pacific Tel: 81.44.844.8296 / Fax: 81.44.844.8298
Visit www.macom.com for additional data sheets and product information.
V4
4
RoHS
Compliant
Lead-Free
CR-12 Ceramic Package
†
†
Reference Application Note M538 for lead-free solder reflow
recommendations.
