AD7321 datasheet(31/37 Pages) AD

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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 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.

THROUGHPUT RATE (kSPS)

100

200

300

400

500

VARIABLE SCLK

VCC = 3V

VDD/VSS = ±12V

TA = 25°C

INTERNAL REFERENCE

Figure 48. Power vs. Throughput Rate with 3 V VCC

THROUGHPUT RATE (kSPS)

100

200

300

400

500

VARIABLE SCLK

VCC = 5V

VDD/VSS = ±12V

TA = 25°C

INTERNAL REFERENCE

Figure 49. Power vs. Throughput Rate with 5 V VCC

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