Datasheet

AD7321 Data Sheet
Rev. B | Page 30 of 36
POWER VS. THROUGHPUT RATE
The power consumption of the AD7321 varies with throughput
rate. The static power consumed by the AD7321 is very low, and
significant power savings is achieved as the throughput rate is
reduced. Figure 48 and Figure 49 shows the power vs.
throughput rate for the AD7321 at a V
CC
of 3 V and 5 V,
respectively. Both plots clearly show that the average power
consumed by the AD7321 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 variable SCLK that scales with the sampling
frequency.
12
0
0
THR
OU
G
H
P
U
T R
A
T
E
(
k
SPS)
AVERAGE POWER (mW)
10
8
6
4
2
10
0 20
0
30
0
40
0 500
V
AR
I
AB
L
E
S
C
L
K
V
C
C
=
3
V
V
D
D
/V
S
S
=
±12
V
T
A
=
25
°
C
I
N
T
E
RN
A
L
R
E
F
E
R
E
NC
E
05399-052
Figure 48. Power vs. Throughput Rate with 3 V V
CC
2
0
0
0
T
HR
O
U
G
H
P
U
T
R
A
TE
(
kSPS)
AVERAGE POWER (mW)
18
1
6
1
4
12
1
0
8
6
4
2
10
0
20
0
30
0 40
0
500
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
N
T
E
RN
A
L R
EF
E
RE
NC
E
05399-053
Figure 49. Power vs. Throughput Rate with 5 V V
CC