Datasheet

AD7324 Data Sheet
Rev. B | Page 30 of 36
POWER VS. THROUGHPUT RATE
The power consumption of the AD7324 varies with throughput
rate. The static power consumed by the AD7324 is very low, and
a significant power savings can be achieved as the throughput
rate is reduced. Figure 49 and Figure 50 shows the power vs.
throughput rate for the AD7324 at a V
CC
of 3 V and 5 V,
respectively. Both plots clearly show that the average power
consumed by the AD7324 is greatly reduced as the sample
frequency is reduced. This is true whether a fixed SCLK value is
used or if it is scaled with the sampling frequency. Figure 49 and
Figure 50 show the power consumption when operating in
normal mode for a fixed 20 MHz SCLK and a variable SCLK
that scales with the sampling frequency.
12
0
0
1
10 0
THROUGHPUT RATE (kSPS)
AVERAGE POWER (mW)
10
8
6
4
2
100 200 300 400 500 600 70
0
800 900 1000
VARIABLE SCLK
20M
Hz S
CLK
V
CC
= 3
V
V
DD
/
V
SS
= ±12V
T
A
=
25°C
I
N
TE
RNAL REFERENCE
04864-052
Figure 49. Power vs. Throughput Rate with 3 V V
CC
20
0
0
1000
THROUGHPUT RATE (kHz)
AVERAGE POWER (mW)
18
16
14
12
10
8
6
4
2
100 20
0 300 400 500 600 700 800 900
20MHz SCLK
VARIABLE SCLK
V
CC
= 5V
V
DD
/V
SS
= ±12V
T
A
= 25°C
INTERNAL REFERENCE
04864-053
Figure 50. Power vs. Throughput Rate with 5 V V
CC