Digital Attenuator, 31.5 dB, 6-Bit,
TTL Driver, DC - 2.0 GHz
AT20-0107
CR-13
V 4.00
Electrical Specifications2: TA = +25°C
Features
nAttenuation: 0.5 dB Steps to 31.5 dB1
nTemperature Stability: ±0.18 dB from –40ºC to +85ºC
Typ.
nLow DC Power Consumption
nSurface Mount Package
nIntegral TTL Driver
nHigh Intercept Point
nLow 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 attenuator and integral 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 perform-
ance as fully hermetic version. Environmentally screenable
as P/N AT-107.
Parameter Test Conditions Frequency Units Min Typ. Max
Insertion Loss — DC - 2.0 GHz dB — 3.2 3.8
Attenuation Accuracy3,4 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
Transients
10% to 90%
50% Control to 90%/10% RF
In-band (peak to peak)
—
—
—
nS
nS
mV
—
—
—
50
150
50
—
—
—
1 dB Compression 5 Input Power
Input Power 50 MHz
0.5 - 2.0 GHz dBm
dBm —
— +21
+29 —
—
Input IP3 5 Two Tone Inputs up to +5 dBm 50 MHz
0.5 - 2.0 GHz dB
dB —
— +35
+48 —
—
Input IP2 5 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 5.5V — mA — — 6.0
-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 VCC and –5.0 V to –8.0 V for VEE and 50O 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 10KO resistor, or an RF choke.
5. VEE = -5 V for the typical numbers given.
Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver, DC - 2.0 GHz AT20-0107
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.
V 4.00
2
Absolute Maximum Ratings 6
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
6. 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) PCB Layout
Digital Attenuator, 31.5 dB, 6-Bit, TTL Driver, DC - 2.0 GHz AT20-0107
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.
V 4.00
Typical Performance Curves
Attenuation Accuracy vs. Frequency Insertion Loss vs. Frequency
Attenuation Accuracy vs. Frequency
3
RF1 VSWR vs. Frequency
RF2 VSWR vs. Frequency Ordering Information
Part Number Package
AT20-0107 Bulk Packaging
AT20-0107TR Tape and Reel (1K Reel)
AT20-0107-TB Unit mounted on a test board
0
1
2
3
4
00.5 11.5 2
Frequency (GHz)
Loss (dB)
+85 °C -40 °C+25 °C
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
00.5 11.5 2
Frequency (GHz)
Deviation (dB)
1 dB 2 dB 4 dB0.5 dB
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
00.5 11.5 2
Frequency (GHz)
Deviation (dB)
31.5 dB8 dB16 dB
1
1.2
1.4
1.6
1.8
2
00.5 11.5 2
Frequency (GHz)
Deviation (dB)
Loss & 0.5 dB 2 dB 1 dB 4 dB 8 & 16 dB
1
1.2
1.4
1.6
1.8
2
00.5 11.5 2
Frequency (GHz)
Deviation (dB)
Loss & 0.5 dB1 & 2 dB 16 dB4 dB 8 dB
