AD7091 데이터 시트보기 (PDF) - Analog Devices

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AD7091

1 MSPS, Ultralow Power, 12-Bit ADC in 8-Lead LFCSP

Analog Devices 

AD7091

Figure 23 and Figure 24 show the typical power dissipation

vs. throughput rate for the AD7091 at 3 V for the VDD supply.

Figure 24 shows the reduction in power consumption that can

be achieved when power-down mode is used compared with

using only normal mode at lower throughput rates.

1100

VDD = 3V

1000

900

800

700

600

500

400

300

200

100

0

0

200

400

600

800

1000

THROUGHPUT RATE (kSPS)

Figure 23. Power Dissipation vs. Throughput Rate (Full Range)

100

VDD (NO PD)

VDD

10

Data Sheet

MULTIPLEXER APPLICATIONS

A multiplexer can be used in the signal chain to switch multiple

analog input signals to the AD7091. In such applications,

control the multiplexer switch time to ensure accurate analog-

to digital-conversion of the input signals. To allow the AD7091

to fully acquire the input signal, the multiplexer should

switch in the channel to be converted a minimum of 350 ns

before initiating a conversion. The multiplexer should also

hold this channel at the AD7091 for a minimum of 200 ns after

the CONVST falling edge.

1

0.01

0.1

1

10

THROUGHPUT RATE (kSPS)

VDD = 3V

VIN = 0V

100

Figure 24. Power Dissipation vs. Throughput Rate (Lower Range)

Rev. B | Page 14 of 20

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