Digital Attenuator
50.0 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0106
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.
V7
1
RoHS
Compliant
Features
• Attenuation: 1 dB steps to 50 dB
• Temperature Stability: ± 0.18 dB from –40°C to
+85°C Typical
• Low DC Power Consumption
• Surface Mount Package
• Integral TTL Driver
• High Intercept Point
• Low Cost/High Performance
• 50 Ohm Nominal Impedance
• Lead-Free CR-13 Package
• 260°C Reflow Compatible
Description
M/A-COM’s AT20-0106 is a GaAs FET 6-bit digital
attenuator with a 1 dB minimum step size and 50 dB
total attenuation. This attenuator and integral TTL
driver is in a ceramic 24-lead surface mount pack-
age. The AT20-0106 is ideally suited for use where
accuracy, fast switching, low power consumption
and low intermodulation products are required. Typi-
cal applications include dynamic range
setting in precision receiver circuits and other gain/
leveling control circuits. Available with enhanced
performance as fully hermetic version. Environmen-
tally screenable as P/N AT-106-PIN.
Ordering Information
Part Number Package
AT20-0106-PIN Bulk Packaging
AT20-0106-TR 1000 piece reel
AT20-0106-TB Sample Test Board
Note: Reference Application Note M513 for reel size
information.
Note: Die quantity varies.
Functional Schematic
Pin Configuration
Pin No. Function Pin No. Function
1 GND 13 RF2
2 GND 14 GND
3 GND 15 GND
4 C32 16 GND
5 C16 17 GND
6 Vee (-5V to -8V) 18 GND
7 Vcc (+5V) 19 GND
8 C8 20 GND
9 C4 21 GND
10 C2 22 GND
11 C1 23 GND
12 GND 24 RF1
The metal bottom of the case must be connected to RF and DC
ground.
* Restrictions on Hazardous Substances, European Union Directive 2002/95/EC.
Digital Attenuator
50.0 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0106
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.
V7
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
—
—
—
3.5
3.9
4.2
3.8
4.2
4.6
Attenuation Accuracy
2
Any Single Bit
Any Combination of Bits
(For attenuation to 26 dB)
Any Combination of Bits
(For attenuation 27 to 50 dB)
DC - 2.0 GHz
DC - 2.0 GHz
DC - 1.5 GHz
dB
dB
dB
± (0.3 +4% of atten. setting)
± (0.4 +4% of atten. setting)
± (0.5 +5% of atten. setting)
VSWR — 0.05 - 0.10 GHz
0.101 - 2.0 GHz
Ratio
Ratio
—
—
—
—
2.0:1
1.8:1
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
—
—
+34
+46
—
—
Input IP2 For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
—
—
+75
+79
—
—
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 — — 6.0
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.
Digital Attenuator
50.0 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0106
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.
V7
3
RoHS
Compliant
Recommended PCB Configuration
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.
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)
C6 C5 C4 C3 C2 C1 Attenuation
0 0 0 0 0 0 Reference
0 0 0 0 0 1 1 dB
0 0 0 0 1 0 2 dB
0 0 0 1 0 0 4 dB
0 0 1 0 0 0 8 dB
0 1 0 0 0 0 16 dB
1 0 0 0 0 0 32 dB
1 1 1 1 1 1 63 dB
Control Inputs
Attenuation Accuracy vs. Frequency
Typical Performance Curves
Insertion Loss vs. Frequency
0
1
2
3
4
5
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
Insertion Loss (dB)
+ 85
°C
+ 25 °C - 55 °C
- 0.60
- 0.40
- 0.20
0.00
0.20
0.40
0.60
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
Deviation from Nominal Atten (dB)
1 d B 2 dB 4 dB 8 dB
0 = TTL Low; 1 = TTL High
Digital Attenuator
50.0 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0106
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.
V7
4
RoHS
Compliant
RF1 VSWR vs. Frequency
RF2 VSWR vs. Frequency
Typical Performance Curves
Attenuation Accuracy vs. Frequency
- 2.00
- 1.00
0.00
1.00
2.00
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
Deviation from Nominal Atten (dB)
16 dB 3 2 d B 4 0 d B 5 0 d B
1
1.2
1.4
1.6
1.8
2
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
VSWR
1 dB4 dB 8 & 16 dB3 2 dBRe f Loss & 2 dB
1
1.2
1.4
1.6
1.8
2
0.0 0.5 1.0 1.5 2.0
Frequency (GHz)
VSW R
1 d B2 dB8 d B 16 dB Re f Lo ss
& 4 d B
3 2 d B
Lead-Free, CR-13 Ceramic Package
†
†
Reference Application Note M538 for lead-free solder reflow
recommendations.
