AD8061/AD8062/AD8063

Rev. D | Page 18 of 20

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.

1V

2V

2

μs

SELECT

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.

49.9

Ω

1k

Ω

+4V

1

–4V

49.9

Ω

TIME

BASE

OUT

TIME

BASE

IN

1V p-p

3MHz

2V p-p

1MHz

49.9

Ω

SELECT

HCO4

1k

Ω

10

μF

0.1

μF

10

μF

0.1

μF

AD8063

49.9

Ω

1k

Ω

+4V

1

1k

Ω

10

μF

0.1

μF

10

μF

0.1

μF

AD8063

Figure 57. AD8063 Mux Output

Figure 56. Two-to-One Multiplexer Using Two AD8063s