Datasheet

AD7328 Data Sheet
Rev. C | Page 30 of 36
POWER VS. THROUGHPUT RATE
The power consumption of the AD7328 varies with the throughput
rate. The static power consumed by the AD7328 is very low, and
significant power savings can be achieved as the throughput rate is
reduced. Figure 51 and Figure 52 show the power vs. throughput
rate for the AD7328 at a V
CC
of 3 V and 5 V, respectively. Both
plots clearly show that the average power consumed by the AD7328
is greatly reduced as the sample frequency is reduced. This is true
whether a fixed SCLK value is used or the SCLK value is scaled
with the sampling frequency. Figure 51 and Figure 52 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.
1
2
0
0
1
10
0
04852-052
THROU
GHP
UT R
ATE
(k SPS)
AVERAGE POWER (mW)
1
0
8
6
4
2
10
0 20
0 300 40
0 500
600 70
0 800
900 100
0
VAR
IABL
E SC
LK
20
MH
z S
C
LK
V
CC
= 3V
V
DD
/V
S
S
=
±
12V
T
A
= 25
°C
INTE
RNAL
REF
ERE
NCE
Figure 51. Power vs. Throughput Rate with 3 V V
CC
20
0
0
1000
04852-053
T
HR
OU
GH
P
UT
RA
T
E (
kH
z)
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
/V
SS
= ±12V
T
A
= 25°C
INTERNAL REFERENCE
Figure 52. Power vs. Throughput Rate with 5 V V
CC