Datasheet

AD7329 Data Sheet
Rev. B | Page 34 of 40
POWER VS. THROUGHPUT RATE
The power consumption of the AD7329 varies with throughput
rate. The static power consumed by the AD7329 is very low, and
significant power savings can be achieved as the throughput rate is
reduced. Figure 55 and Figure 56 show the power vs. throughput
rate for the AD7329 at a V
CC
of 3 V and 5 V, respectively. Both
plots clearly show that the average power consumed by the AD7329
is greatly reduced as the sample frequency is reduced. This is true
whether a fixed SCLK value is used or if the SCLK value is scaled
with the sampling frequency. Figure 55 and Figure 56 show the
power consumption when operating the device in normal mode
for a fixed 20 MHz SCLK and a variable SCLK that scales with
the sampling frequency.
12
0
0
1100
05402-050
THROUGHPUT RATE (kSPS)
AVERAGE POWER (mW)
10
8
6
4
2
100 200 300 400 500
600
700 800
900 1000
VARIABLE SCLK
20MHz SCLK
V
CC
= 3V
V
DD
= 12V, V
SS
= –12V
T
A
= 25°C
INTERNAL REFERENCE
Figure 55. Power vs. Throughput Rate with 3 V V
CC
20
0
0
1000
05402-051
THROUGHPUT RATE (kHz)
AVERAGE POWER (mW)
18
16
14
12
10
8
6
4
2
100 200 300 400
500 600
700 800 900
20MHz SCLK
VARIABLE SCLK
V
CC
= 5V
V
DD
= 12V, V
SS
= –12V
T
A
= 25°C
INTERNAL REFERENCE
Figure 56. Power vs. Throughput Rate with 5 V V
CC