AD7472BRU(2000) 查看數據表（PDF） - Analog Devices

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AD7472BRU
(Rev.:2000)

1.75 MSPS, 4 mW 10-Bit/12-Bit Parallel ADCs

Analog Devices 

AD7470/AD7472

Mode 1

Figure 14 shows the AD7472 conversion sequence in Mode 1

using a throughput rate of 500 kSPS and a clock frequency of

26 MHz. At 5 V supply the current consumption for the part

when converting is 2 mA and the quiescent current is 650 µA.

The conversion time of 531.66 ns contributes 2.658 mW to the

overall power dissipation in the following way:

(531.66 ns/2 µs) × (5 × 2 mA) = 2.658 mW

The contribution to the total power dissipated by the remaining

1.468 µs of the cycle is 2.38 mW.

(1.468 µs/2 µs) × (5 × 650 µA) = 2.38 mW

Thus the power dissipated during each cycle is:

2.658 mW + 2.38 mW = 5.038 mW

CONVST

BUSY

tCONVERT

tQUIESCENT

Figure 16 and Figure 17 show a typical graphical representation

of Power vs. Throughput for the AD7472 when in (a) Mode 1

@ 5 V and 3 V and Mode 2 @ 5 V and 3 V.

8

7

6

+5V

5

4

3

+3V

2

1

0

50

300 600

800 1000 1100 1300 1500

THROUGHPUT – kHz

Figure 16. Power vs. Throughput (Mode 1 @ 5 V and 3 V)

531.66ns

1.468␮s

2␮s

Figure 14. Mode 1 Power Dissipation

Mode 2

Figure 15 shows the AD7472 conversion sequence in Mode 2

using a throughput rate of 500 kSPS and a clock frequency of

26 MHz. At 5 V supply the current consumption for the part

when converting is 2 mA, while the sleep current is 1 µA max.

The power dissipated during this power-down is negligible and

is thus not worth considering in the total power figure. During

the wake-up phase, the AD7472 will draw 650 µA. Overall

power dissipated is:

( ) ( ) ( ) ( ) 531.66 ns / 2 µs × 5 × 2 mA + 1µs / 2 µs × 5 × 650 µA = 4.283 mW

CONVST

BUSY

tWAKEUP

tCONVERT

1␮s

2␮s

tQUIESCENT

531.66ns

1.468␮s

Figure 15. Mode 2 Power Dissipation

7

6

5

+5V

4

3

2

+3V

1

0

50 100 150 200 250 300 350 400 450 500 550 600 650 700 750

THROUGHPUT – kHz

Figure 17. Power vs. Throughput (Mode 2 @ 5 V and 3 V)

1

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1

0

512 1024 1536 2048 2560 3072 3584 4096

CODE

Figure 18. Typical INL for 2.75 V @ +25°C

–12–

REV. A

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