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AD7328 Datasheet(PDF) 30 Page - Analog Devices

Part No. AD7328
Description  8-Channel, Software-Selectable True Bipolar Input, 12-Bit Plus Sign ADC
Download  36 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7328 Datasheet(HTML) 30 Page - Analog Devices

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AD7328
Rev. A | Page 30 of 36
POWER VS. THROUGHPUT RATE
20
0
0
1000
THROUGHPUT RATE (kHz)
18
16
14
12
10
8
6
4
2
100
200
300
400
500
600
700
800
900
20MHz SCLK
VARIABLE SCLK
VCC =5V
VDD/VSS = ±12V
TA =25°C
INTERNAL REFERENCE
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 VCC 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.
12
0
0
1100
THROUGHPUT RATE (kSPS)
10
8
6
4
2
100 200 300 400 500 600 700 800 900 1000
VARIABLE SCLK
20MHz SCLK
VCC =3V
VDD/VSS = ±12V
TA = 25°C
INTERNAL REFERENCE
Figure 52. Power vs. Throughput Rate with 5 V VCC
Figure 51. Power vs. Throughput Rate with 3 V VCC


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