Digital Attenuator, 32 dB, 2-Bit,
TTL Driver, DC - 2 GHz
AT20-0273
CR-11
V 3.00
Features
nAttenuation: 16 dB steps to 32 dB
nTemperature Stability: ± 0.18 dB from –40°C to +85°C
Typical
nLow DC Power Consumption
nSurface Mount Package
nIntegral TTL Driver
nLow Cost/High Performance
n50 Ohm Nominal Impedance
Description
M/A-COM’s AT20-0273 is a GaAs FET digital
attenuator with a 16 dB minimum step size and 32 dB total
attenuation. This attenuator and integral TTL driver is in a
sealed ceramic 16-lead surface mount package. The
AT20-0273 is ideally suited for use where accuracy, fast
switching, 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.
Environmentally screenable as P/N AT-273.
Electrical Specifications: TA = 25°C1
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
—
—
—
1.2
1.3
1.5
1.6
1.7
1.9
Attenuation Accuracy 2 C1 Bit
Full Attenuation (32 dB)
DC - 2.0 GHz
DC - 0.5 GHz
DC - 1.0 GHz
DC - 2.0 GHz
± 3% of attenuation setting in dB
± 3% of attenuation setting in dB
± 3% of attenuation setting in dB, -1 dB
± 3% of attenuation setting in dB, -3 dB
VSWR — DC - 2.0 GHz Ratio — — 1.4:1
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 —
— +38
+48 —
—
Input IP2 For two-tone Input Power
Up to +5 dBm 0.05 GHz
0.5 - 2.0 GHz dBm
dBm —
— +44
+68 —
—
Vcc — — V 4.5 5.0 5.5
Vee — — V -8.0 — -5.0
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, 32 dB, 2-Bit, TTL Driver, DC - 2 GHz AT20-0273
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 3.00
2
Parameter Test Conditions Frequency Units Min Typ Max
Icc Vcc = 4.5 to 5.5V
Vctl = 0 to 0.8V, or Vcc –2.1V to Vcc — mA — — 2.0
Iee Vee = -5.0 to -8.0V — mA — — 1.0
Electrical Specifications: TA = 25°C
Absolute Maximum Ratings 3
3. Operation of this device above any one of these parameters
may cause permanent damage.
4. Standard CMOS TTL interface, latch-up will occur if logic
signal is applied prior to power supply.
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 4 -0.5V to Vcc +0.5V
Operating Temperature -40°C to +125°C
Storage Temperature -65°C to +150°C
Truth Table
0 = TTL Low 1 = TTL High
C2 C1 Attenuation
0 0 Reference
0 1 16 dB
1 0 32 dB
Control Input
Functional Schematic (Top View) 5
RF1
GND
GND
GND
Vee
Vcc
RF2
GND
GND
GND
GND
16 dB
16 dB
C1
GND Orientation Mark
C2 PIN 1
NC
PIN 16 NC
5. Use the C1 control for a single 16-dB bit.
Digital Attenuator, 32 dB, 2-Bit, TTL Driver, DC - 2 GHz AT20-0273
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 3.00
Typical Performance Curves
Attenuation Accuracy vs. Frequency Ref. Insertion Loss vs. Frequency
VSWR vs. Frequency
3
Ordering Information
Part Number Package
AT20-0273 CR-11
0
1
2
3
4
5
0.0 0.5 1.0 1.5 2.0 2.5 3
Frequency (GHz)
Loss (dB)
+85°C +25°C -55°C
-5.0
-4.0
-3.0
-2.0
-1.0
0.0
1.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
Deviation from Nominal Atten (dB)
Full Attenuation 16 dB bit
1.00
1.20
1.40
1.60
1.80
2.00
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Frequency (GHz)
VSWR
16 dB State 32 dB StateFull Attenuation
