–10–

SMP04

REV. D

APPLICATIONS

MULTIPLEXED QUAD DAC (Figure 20)

The SMP04 can be used to demultiplex a single DAC converter’s

output into four separate analog outputs. The circuit is greatly

simplified by using a voltage output DAC such as the DAC8228.

To minimize output voltage perturbation, 5

µs should be allowed

to settle to its final voltage before a sample signal is asserted.

Each sample-and-hold amplifier must be refreshed every second

or less in order to assure the droop does not exceed 10 mV or

1/2 LSB.

CHANNEL

DECODE

DGND

SMP04

1 F

+12V

REF02

+12V

0.1 F

1/2 DAC8228

+5V

GND

DIGITAL

INPUTS

ADDRESS

INPUTS

+12V

5V TO 10V

WR

CS

+

Figure 20. Multiplexed Quad DAC