Datasheet

Data Sheet AD7322
Rev. B | Page 29 of 36
POWER vs. THROUGHPUT RATE
The power consumption of the AD7322 varies with throughput
rate. The static power consumed by the AD7322 is very low, and
a significant power savings can be achieved as the throughput
rate is reduced. Figure 48 and Figure 49 shows the power vs.
throughput rate for the AD7322 at a V
CC
of 3 V and 5 V,
respectively. Both plots clearly show that the average power
consumed by the AD7322 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 48 and
Figure 49 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.
1
2
0
0
110
0
T
HR
O
UG
H
P
U
T
R
A
T
E
(
k
SPS)
AVERAGE POWER (mW)
1
0
8
6
4
2
10
0 20
0
30
0
40
0
50
0
600
70
0
800
900 100
0
V
AR
I
AB
L
E
S
C
L
K
20
M
H
z
S
C
L
K
V
C
C
= 3
V
V
D
D
/
V
S
S
=
±
12V
T
A
=
25
°
C
I
N
T
E
RNA
L R
EFER
ENCE
04863-052
Figure 48. Power vs. Throughput Rate with 3 V V
CC
20
0
0
100
0
T
HR
O
U
G
H
P
U
T
R
A
T
E
(
k
H
z)
AVERAGE POWER (mW)
1
8
1
6
1
4
1
2
1
0
8
6
4
2
10
0
20
0
30
0
40
0
50
0
60
0
70
0
80
0
90
0
20
M
H
z
S
C
L
K
V
AR
I
AB
L
E
S
C
L
K
V
C
C
=
5
V
V
D
D
/
V
S
S
=
±
12
V
T
A
= 25
°C
I
NT
ERN
A
L R
EF
E
RE
NCE
04863-053
Figure 49. Power vs. Throughput Rate with 5 V V
CC