Digital Attenuator, 31.5 dB, 6-Bit , TTL Driver
DC - 2.0 GHz
AT20-0107
North America: Tel. (800) 366-2266, Fax (800) 618-8883
A sia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Specifications subject to change without notice.
Visit www.macom.com for additional data sheets and product information.
V 3.00
Features
•Attenuation: 0.5 dB Steps to 31.5 dB1
•Temperature Stability: ±0.18 dB from –40ºC to +85ºC Typ.
•Low DC Power Consumption
•Surface Mount Packag e
•Integral TTL Driver
•High Intercept Point
•Low Cost/High Performance
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 at-
tenuat or and integral TTL driver is i n a ceramic 24-lead surface
mount package. The AT20-0107 is ideally suited for use where
accuracy, fast sp eed, very low power consumption and low inter-
modulation products are required. Typical applications include dy-
namic range setting in precision receiver circuits and other gain/
leveling control circuits. Available with enhanced performance as
fully hermetic version. Environmentally screenable as P/N AT-107.
Electrical Spec if ications3 TA = +25°C
Parameter Test Conditions Frequency Units Min Typical Max
Insertion Loss —
—
—
DC - 0.5 GHz
DC - 1.0 GHz
DC - 2.0 GHz
dB
dB
dB
—
—
—
2.5
2.9
3.2
3.0
3.4
3.8
Attenuation Accuracy4,5 Any Bit or Combination of Bits DC - 2.0 GHz dB — — +(.3 +7% of atten.)
-(.2 +1% of atten.)
VSWR Full Range DC - 2.0 GHz Ratio — — 1.8:1
Trise, Tfall
Ton, Toff
10% to 90%
50% Control to 90%/10% RF
nS
nS
—
—
50
150
—
—
3. All specifications apply when operated with bias voltages of +5V
for VCC and –5.0 V to –8.0 V for VEE and 50Ω impedance at all
ports unless otherwise stated.
4. This attenuator is guaranteed monotonic.
5. For the attenuator to meet the guaranteed specifications, it is nec-
essary to have a DC return on either RF1 or RF2. The DC return
can be either a 10KΩ resistor, or an RF choke.
6. VEE = -5 V for the typical numbers given.
Ordering Information
Part Number Package
AT20-0107
AT20-0107-TR
AT20-0107-TB
Bulk Packaging
Tape and Reel2
Unit mounted on a test board
2. Check with the factory for available quantities and reel size.
CR-13
1. Above reference insertion loss.
Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver DC - 2.0 GHz AT20-0107
Electrical Specifications TA = +25°C
Parameter Test Conditions Frequency Units Min Typical Max
Input IP36 Two-tone inputs up to +5 dBm 50 MHz
0.5-2.0 GHz
dB
dB
—
—
+35
+48
—
—
Input IP26 Two-tone inputs up to +5 dBm 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 Vcc = 4.5 to 5.5 V mA — — 6.0
-Iee -Vee = -5.0 to –8.0 V mA — — 1.0
1 dB Compression6 Input Power
Input Power
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
—
—
+75
+79
—
—
Absolute Maximum Ratings 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 -0.5V to VCC +0.5V
Operating Temperature -40°C to +125°C
Storage Temperature -65°C to +150°C
7. Operation of this device above any one of these parameters may
cause permanent damange.
Truth Table
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
Functional Schematic (Top View)
North Am erica: Tel. (800) 366-2266, Fax (800) 618-8883
A sia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Specifications subject to change without notice.
Visit www.macom.com for additional data sheets and product information.
V 3.00
Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver DC - 2.0 GHz AT20-0107
Typical Performance
PCB Layout
North Am erica: Tel. (800) 366-2266, Fax (800) 618-8883
A sia/Pacific: Tel.+81-44-844-8296, Fax +81-44-844-8298
Europe: Tel. +44 (1344) 869 595, Fax+44 (1344) 300 020
Specifications subject to change without notice.
Visit www.macom.com for additional data sheets and product information.
V 3.00
Insertion Loss vs Frequency
0
1
2
3
4
00.511.52
Frequency (GHz)
+85 °C
-40 °C+25 °C
Attenuation Accuracy vs. Frequency
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
00.511.52
Frequency (GHz)
1 dB
2 dB
4 dB
.5 dB
Attenuati o n A ccu r acy vs. F r eq u en cy
-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)
31.5 dB
8 dB
16 dB
RF1 VSWR vs. Frequency
1
1.2
1.4
1.6
1.8
2
00.511.52
Frequency (GHz)
Loss & .5 dB
2 dB
1dB
4 dB 8 & 16 dB
RF2 VSWR vs. Frequency
1
1.2
1.4
1.6
1.8
2
00.511.52
Frequency (GHz)
Loss & .5 dB
1&2dB
16 dB4 dB
8
