Digital Attenuator
31.5 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0107
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.
V5
1
RoHS
Compliant
Features
•
Attenuation: 0.5 dB Steps to 31.5 dB
1
•
Temperature Stability: ±0.18 dB from –40ºC to +85ºC
Typ.
•
Low DC Power Consumption
•
Surface Mount Package
•
Integral TTL Driver
•
High Intercept Point
•
Low Cost/High Performance
• Lead-Free CR-13 Package
• 260°C Reflow Compatible
Description
M/A-COM's AT20-0107 is a GaAs FET 6-bit digital
attenuator with a 0.5 dB minimum step size and a
31.5 dB total attenuation. This attenuator and inte-
gral TTL driver is in a ceramic 24-lead surface mount
package. The AT20-0107 is ideally suited for use
where accuracy, fast speed, 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. Environmen-
tally screenable as P/N AT-107-PIN.
Ordering Information
Part Number Package
AT20-0107-PIN Bulk Packaging
AT20-0107-TR 1000 piece reel
AT20-0107-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 C16 16 GND
5 C8 17 GND
6 Vee 18 GND
7 Vcc 19 GND
8 C4 20 GND
9 C2 21 GND
10 C1 22 GND
11 C0.5 23 GND
12 GND 24 RF1
* Restrictions on Hazardous Substances, European Union Directive 2002/95/EC.
The metal bottom of the case must be connected to RF and DC
ground.
Digital Attenuator
31.5 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0107
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.
V5
2
RoHS
Compliant
Electrical Specifications: T
A
= +25°C
2
Parameter Frequency Units Min Typ Max
Insertion Loss DC - 2.0 GHz dB — 3.2 3.8
Attenuation Accuracy
1,3,4
DC - 2.0 GHz dB — — +(.3 +7% of atten.)
-(.2 +1% of atten.)
VSWR DC - 2.0 GHz Ratio — — 1.8:1
Trise, Tfall
Ton, Toff
Transients
—
—
—
nS
nS
mV
—
—
—
50
150
50
—
—
—
1 dB Compression
5
50 MHz
0.5 - 2.0 GHz
dBm
dBm
—
—
+21
+29
—
—
Input IP
3
5
50 MHz
0.5 - 2.0 GHz
dB
dB
—
—
+35
+48
—
—
Input IP
2
5
50 MHz
0.5 - 2.0 GHz
dB
dB
—
—
+75
+79
—
—
Vcc
-Vee
—
—
V
V
4.5
-8.0
5.0
—
5.5
-5.0
Icc — mA — — 6.0
Test Conditions
—
Any Bit or Combination of
Bits
Full Range
10% to 90%
50% Control to 90%/10%
RF
In-band (peak to peak)
Input Power
Input Power
Two Tone Inputs up to
+5 dBm
Two Tone Inputs up to
+5 dBm
—
—
Vcc = 4.5 to 5.5V
-Iee -Vee = -5.0 to -8.0V — mA — — 1.0
1. Above reference insertion loss.
2. All specifications apply when operated with bias voltages of +5V for V
CC
and –5.0 V to –8.0 V for V
EE
and 50Ω impedance at all ports
unless otherwise stated.
3. This attenuator is guaranteed monotonic.
4. For the attenuator to meet the guaranteed specifications, it is necessary to have a DC return on either RF1 or RF2. The DC return can be
either a 10KΩ resistor, or an RF choke.
5. V
EE
= -5 V for the typical numbers given.
Absolute Maximum Ratings
6,7
Parameter Absolute Maximum
Max. Input Power
0.05 GHz
0.5 - 2.0 GHz
+27 dBm
+34 dBm
+Vcc +5.5V
-Vee -8.5V
Control Voltage
8
-0.5V to V
CC
+0.5V
Operating Temperature -40°C to +125°C
Storage Temperature -65°C to +150°C
6. Exceeding any one or combination of these limits may cause
permanent damage to this device.
7. M/A-COM does not recommend sustained operation near
these survivability limits.
8. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.
Recommended PCB Configuration
Digital Attenuator
31.5 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0107
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.
V5
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)
C16 C8 C4 C2 C1 C0.5 Attenuation
0 0 0 0 0 0 Loss, Reference
0 0 0 0 0 1 0.5 dB
0 0 0 0 1 0 1.0 dB
0 0 0 1 0 0 2.0 dB
0 0 1 0 0 0 4.0 dB
0 1 0 0 0 0 8.0 dB
1 0 0 0 0 0 16.0 dB
1 1 1 1 1 1 31.5 dB
0 = TTL Low; 1 = TTL High
Attenuation Accuracy vs. Frequency
Typical Performance Curves
Insertion Loss vs. Frequency
0
1
2
3
4
0 0.5 1 1.5 2
Frequency (GHz)
Loss (dB)
+ 8 5 °C - 4 0 °C+ 2 5 °C
- 0.6
- 0.4
- 0.2
0
0.2
0.4
0.6
0 0.5 1 1.5 2
Frequency (GHz)
Deviation (dB)
1 dB 2 dB 4 d B0 .5 d B
RF1 VSWR vs. Frequency
Attenuation Accuracy vs. Frequency
- 0.8
- 0.6
- 0.4
- 0.2
0
0.2
0.4
0.6
0.8
0 0.5 1 1.5 2
Frequency (GHz)
Deviation (dB)
3 1. 5 d B8 dB16 dB
1
1.2
1.4
1.6
1.8
2
0 0.5 1 1.5 2
Frequency (GHz)
Deviation (dB)
Loss & 0 . 5 d B 2 dB 1 dB 4 dB 8 & 16 dB
Digital Attenuator
31.5 dB, 6-Bit, TTL Driver, DC-2.0 GHz
AT20-0107
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.
V5
4
RoHS
Compliant
RF2 VSWR vs. Frequency
Typical Performance Curves
1
1.2
1.4
1.6
1.8
2
0 0.5 1 1.5 2
Frequency (GHz)
Dev ia tio n (dB )
Lo ss & 0 .5 dB1 & 2 dB 16 d B4 dB 8 dB
Lead-Free, CR-13 Ceramic Package
†
†
Reference Application Note M538 for lead-free solder reflow
recommendations.
