AD7091 datasheet(14/20 Pages) AD

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AD7091

Data Sheet

Rev. A | Page 14 of 20

Figure 23 and Figure 24 show the typical power dissipation

vs. throughput rate for the AD7091 at 3 V for the VDD supply.

Figure 24 shows the reduction in power consumption that can

be achieved when power-down mode is used compared with

using only normal mode at lower throughput rates.

100

200

300

400

500

600

700

800

900

1000

1100

200

400

600

800

1000

THROUGHPUT RATE (kSPS)

VDD = 3V

Figure 23. Power Dissipation vs. Throughput Rate (Full Range)

100

0.01

0.1

100

THROUGHPUT RATE (kSPS)

VDD (NO PD)

VDD = 3V

VIN = 0V

VDD

Figure 24. Power Dissipation vs. Throughput Rate (Lower Range)

MULTIPLEXER APPLICATIONS

A multiplexer can be used in the signal chain to switch multiple

analog input signals to the AD7091. In such applications,

control the multiplexer switch time to ensure accurate analog-

to digital-conversion of the input signals.

To allow the AD7091

to fully acquire the input signal, the multiplexer should

switch in the channel to be converted a minimum of 350 ns

before initiating a conversion. The multiplexer should also

hold this channel at the AD7091 for a minimum of 200 ns after

the CONVST falling edge.

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