AD8063 Просмотр технического описания (PDF) - Analog Devices

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AD8063

Low Cost, 300 MHz Rail-to-Rail Amplifiers

Analog Devices 

AD8061/AD8062/AD8063

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.

Figure 56 shows a schematic of two AD8063 devices 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.

+4V

0.1µF 10µF

1V p-p

3MHz

TIME

BASE

OUT

1

49.9Ω AD8063

0.1µF 10µF

–4V

1kΩ

1kΩ

+4V

49.9Ω

VOUT

49.9Ω

0.1µF 10µF

2V p-p

1MHz

TIME

BASE

IN

1

49.9Ω AD8063

0.1µF 10µF

–4V

1kΩ

1kΩ

HCO4

SELECT

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

The select signal and the output waveforms for this circuit are

shown in Figure 57. For synchronization clarity, two different

frequency synthesizers, whose time bases are locked to each

other, generate the signals.

2µs

OUTPUT

SELECT

1V

2V

Figure 57. AD8063 Mux Output

Rev. E | Page 18 of 20

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