AD7329 datasheet(34/40 Pages) AD

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AD7329

Rev. 0 | Page 34 of 40

POWER VS. THROUGHPUT RATE

The power consumption of the AD7329 varies with throughput

rate. The static power consumed by the AD7329 is very low, and

significant power savings can be achieved as the throughput

rate is reduced. Figure 55 and Figure 56 shows the power vs.

throughput rate for the AD7329 at a VCC of 3 V and 5 V,

respectively. Both plots clearly show that the average power

consumed by the AD7329 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 55 and

Figure 56 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.

1100

THROUGHPUT RATE (kSPS)

100 200 300 400 500 600 700 800 900 1000

VARIABLE SCLK

20MHz SCLK

VCC = 3V

VDD = 12V, VSS = –12V

TA = 25°C

INTERNAL REFERENCE

Figure 55. Power vs. Throughput Rate with 3 V VCC

1000

THROUGHPUT RATE (kHz)

100

200

300

400

500

600

700

800

900

20MHz SCLK

VARIABLE SCLK

VCC = 5V

VDD = 12V, VSS = –12V

TA = 25°C

INTERNAL REFERENCE

Figure 56. Power vs. Throughput Rate with 5 V VCC

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