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AD7327 Datasheet(PDF) 31 Page - Analog Devices

Part # AD7327
Description  500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7327 Datasheet(HTML) 31 Page - Analog Devices

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AD7327
Rev. 0 | Page 31 of 36
POWER VS. THROUGHPUT RATE
The power consumption of the AD7327 varies with throughput
rate. The static power consumed by the AD7327 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 AD7327 at a VCC of 3 V and 5 V,
respectively. Both plots clearly show that the average power
consumed by the AD7327 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 variable SCLK that scales with the sampling
frequency.
12
0
0
THROUGHPUT RATE (kSPS)
10
8
6
4
2
100
200
300
400
500
VARIABLE SCLK
VCC =3V
VDD/VSS = ±12V
TA =25°C
INTERNAL REFERENCE
Figure 51. Power vs. Throughput Rate with 3 V VCC
20
0
0
THROUGHPUT RATE (kSPS)
18
16
14
12
10
8
6
4
2
100
200
300
400
500
VARIABLE SCLK
VCC =5V
VDD/VSS = ±12V
TA =25°C
INTERNAL REFERENCE
Figure 52. Power vs. Throughput Rate with 5 V VCC


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