AD8061/AD8062/AD8063
The SELECT signal and the output waveforms for this circuit
are shown in Figure 57. For synchronization clarity, two differ-
ent frequency synthesizers, whose time bases are locked to each
other, generate the signals.
MULTIPLEXER
The AD8063 has a disable pin used to power down the ampli-
fier to save power or to create a mux circuit. If two (or more)
AD8063 outputs are connected together, and only one is enabled,
then only the signal of the enabled amplifier will appear at the
output. This configuration is used to select from various input
signal sources. Additionally, the same input signal is applied to
different gain stages, or differently tuned filters, to make a gain-
step amplifier or a selectable frequency amplifier.
2μs
OUTPUT
Figure 56 shows a schematic of two AD8063s used to create a
mux that selects between two inputs. One of these is a 1 V p-p,
3 MHz sine wave; the other is a 2 V p-p, 1 MHz sine wave.
SELECT
+4V
1V
2V
0.1μF
10μF
10μF
Figure 57. AD8063 Mux Output
1
TIME
BASE
OUT
49.9Ω
AD8063
1V p-p
3MHz
0.1μF
1kΩ
–4V
+4V
V
49.9Ω
OUT
1kΩ
49.9Ω
0.1μF
10μF
10μF
1
49.9Ω
AD8063
–4V
2V p-p
1MHz
TIME
BASE
IN
0.1μF
1kΩ
1kΩ
HCO4
SELECT
Figure 56. Two-to-One Multiplexer Using Two AD8063s
Rev. D | Page 18 of 20
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