Datasheet

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 V
DD
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.
0
100
200
300
400
500
600
700
800
900
1000
1100
0 200 400 600 800 1000
POWER (μW)
THROUGHPUT RATE (kSPS)
V
DD
= 3V
10494-124
Figure 23. Power Dissipation vs. Throughput Rate (Full Range)
1
10
100
0.01 0.1 1 10 100
POWER (μW)
THROUGHPUT RATE (kSPS)
V
DD
(NO PD)
V
DD
= 3V
V
IN
= 0V
V
DD
10494-123
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.