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AD7492 Datasheet(PDF) 17 Page - Analog Devices

Part # AD7492
Description  1.25 MSPS, 16 mW Internal REF and CLK, 12-Bit Parallel ADC
PDF  24 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7492 Datasheet(HTML) 17 Page - Analog Devices

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AD7492
Rev. A | Page 17 of 24
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
BUSY
880ns
9.5ms
10ms
tQUIESCENT
tCONVERT
500µs
tWAKEUP
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
BUSY
880ns
1ms
tQUIESCENT
tCONVERT
20µs
tWAKEUP
979µs
Figure 24. Partial Sleep Power Dissipation
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.
0
700
2
4
6
8
10
12
800
400
300
200
100
0
3V
5V
THROUGHPUT (kHz)
500
600
900 1000
Figure 25. Power vs. Throughput
(Mode 1 @ 5 V and 3 V)
3V
5V
0.5
70
1.0
1.5
2.0
2.5
3.0
3.5
80
40
30
20
10
0
THROUGHPUT (kHz)
50
60
90
100
0
Figure 26. Power vs. Throughput
(Mode 2 in Full Sleep Mode @ 5 V and 3 V)
3V
5V
0.5
70
1.0
1.5
2.0
2.5
80
40
30
20
10
0
THROUGHPUT (kHz)
50
60
90
100
0
Figure 27. Power vs. Throughput
(Mode 2 in Partial Sleep Mode @ 5 V and 3 V)



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