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AD7321 Datasheet(PDF) 30 Page - Analog Devices

Part No. AD7321
Description  500 kSPS, 2-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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AD7321 Datasheet(HTML) 30 Page - Analog Devices

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AD7321
Rev. 0 | Page 30 of 36
POWER VS. THROUGHPUT RATE
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
The power consumption of the AD7321 varies with throughput
rate. The static power consumed by the AD7321 is very low, and
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 AD7321 at a VCC 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
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 49. Power vs. Throughput Rate with 5 V VCC
Figure 48. Power vs. Throughput Rate with 3 V VCC


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