AD7328 datasheet(30/36 Pages) AD

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AD7328

Rev. A | Page 30 of 36

POWER VS. THROUGHPUT RATE

1000

THROUGHPUT RATE (kHz)

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.

1100

THROUGHPUT RATE (kSPS)

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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