AD7492BR 查看數據表（PDF） - Analog Devices

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AD7492BR

1.25 MSPS, 16 mW Internal REF and CLK, 12-Bit Parallel ADC

Analog Devices 

Mode 2 (Full Sleep Mode)

Figure 23 shows the AD7492 conversion sequence in Mode 2,

full sleep mode, using a throughput rate of approximately

100 kSPS. At 5 V supply the current consumption for the part

when converting is 3 mA, while the full sleep current is 1 μA

maximum. The power dissipated during this power-down is

negligible and thus not worth considering in the total power

figure. During the wake-up phase, the AD7492 draws typically

1.8 mA. Overall power dissipated is

(880 ns/10 ms) × (5 × 3 mA) + (500 μs/10 ms) × (5 × 1.8 mA)

= 451.32 μW

CONVST

tWAKEUP

500µs

tCONVERT

BUSY

tQUIESCENT

880ns

9.5ms

10ms

Figure 23. Full Sleep Power Dissipation

Mode 2 (Partial Sleep Mode)

Figure 24 shows the AD7492 conversion sequence in Mode 2,

partial sleep mode, using a throughput rate of 1 kSPS. At 5 V

supply, the current consumption for the part when converting is

3 mA, while the partial sleep current is 250 μA maximum.

During the wake-up phase, the AD7492 typically draws 1.8 mA.

Power dissipated during wake-up and conversion is

(880 ns/1 ms) × (5 × 3 mA) + (20 μs/1 ms) × (5 × 1.8 mA) =

193.2 mW

Power dissipated during power-down is

(979 μs/1 ms) × (5 × 250 μA) = 1.22 mW

Overall power dissipated is

193.2 μW + 1.22 mW = 1.41 mW

CONVST

tWAKEUP

20µs

tCONVERT

BUSY

tQUIESCENT

880ns

979µs

1ms

Figure 24. Partial Sleep Power Dissipation

AD7492

Figure 25, Figure 26, and Figure 27 show a typical graphical

representation of power vs. throughput for the AD7492 when in

Mode 1 @ 5 V and 3 V, Mode 2 in full sleep mode @ 5 V and 3

V, and Mode 2 in partial sleep mode @ 5 V and 3 V.

12

10

5V

8

6

4

3V

2

0

0 100 200 300 400 500 600 700 800 900 1000

THROUGHPUT (kHz)

Figure 25. Power vs. Throughput

(Mode 1 @ 5 V and 3 V)

3.5

3.0

2.5

2.0

5V

1.5

3V

1.0

0.5

0

0 10 20 30 40 50 60 70 80 90 100

THROUGHPUT (kHz)

Figure 26. Power vs. Throughput

(Mode 2 in Full Sleep Mode @ 5 V and 3 V)

2.5

2.0

5V

1.5

3V

1.0

0.5

0

0 10 20 30 40 50 60 70 80 90 100

THROUGHPUT (kHz)

Figure 27. Power vs. Throughput

(Mode 2 in Partial Sleep Mode @ 5 V and 3 V)

Rev. A | Page 17 of 24

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