Digital Attenuator, 31 dB, 5-Bit,
TTL Driver, DC - 2 GHz
AT20
-0263

CR-12
V 3.00
Features
n Attenuation: 1 dB steps to 31 dB
n Temperature Stability: ± 0.18 dB from –40°C to +85°C
Typical
n Low DC Power Consumption
n Surface Mount Package
n Integral TTL Driver
n Low Cost/High Performance
n 50 Ohm Nominal Impedance

Description
M/A-COM’s AT20-0263 is a GaAs FET 5-bit digital
attenuator with a 1 dB minimum step size and 31 dB total
attenuation. This attenuator and integral TTL driver is in a
ceramic 16-lead surface mount package. The AT20-0263 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-263.
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
—
—
—
2.0
2.2
2.5
2.4
2.8
3.0
Attenuation Accuracy 2 Any Single Bit
Any Combination of Bits

DC - 1.0 GHz
DC - 2.0 GHz
± (0.25 +3% of atten setting in dB) dB
± (0.25 +3% of atten setting in dB) dB
or ± 0.4 dB, whichever is greater
VSWR — DC - 2.0 GHz Ratio — — 1.6:1
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
—
—
+40
+48
—
—
Input IP2 For two-tone Input Power
Up to +5 dBm
0.05 GHz
0.5 - 2.0 GHz
dBm
dBm
—
—
+45
+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.