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AD7328
POWER VS. THROUGHPUT RATE
The power consumption of the AD7328 varies with 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 shows the power vs.
throughput rate for the AD7328 at a V
CC
of 3 V and 5 V, respect-
tively. 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 if it
is scaled with the sampling frequency. Figure 51 and Figure 52
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.
Rev. A | Page 30 of 36
20
0
0
1000
0
THROUGHPUT RATE (kHz)
A
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
= ±12V
T
= 25°C
INTERNAL REFERENCE
12
0
0
1100
0
THROUGHPUT RATE (kSPS)
A
10
8
6
4
2
100
200
300
400
500
600
700
800
900 1000
VARIABLE SCLK
20MHz SCLK
V
CC
= 3V
V
DD
/V
= ±12V
T
= 25°C
INTERNAL REFERENCE
Figure 52. Power vs. Throughput Rate with 5 V V
CC
Figure 51. Power vs. Throughput Rate with 3 V V
CC
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