Datasheet

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FULL POWER-DOWN MODE
PD
SDO
BUSY
Valid Data
td16
REFOUT
t
w4
t
d10
t
d18
Invalid Data
1 2 3
t
d11
t
d17
Full I
CC
Full I
CC
I
CC
PD
I
CC
PD
SDO
BUSY
1
2 3
Full I
CC
Full I
CC
t
w4
t
d10
Valid DataInvalid Data
t
d11
t
acq1
I
CC
I
CC
PD
t
d16
t
d18
ADS8382
SLAS416B – JUNE 2004 – REVISED NOVEMBER 2004
Table 2. Power Save
POWER
TYPE OF POWER DOWN SDO ACTIVATED BY ACTIVATION TIME (t
d16
) RESUME POWER BY
CONSUMPTION
Normal operation Not 3 stated 22 mA NA NA NA
Full power down 3 Stated (t
d10
2 µA PD = 1 10 µs PD = 0
(Int Ref, 1-µF capacitor on REFOUT pin) timing)
Full power down 3 Stated (t
d10
2 µA PD = 1 10 µs PD = 0
(Ext Ref, 1-µF capacitor on REFOUT pin) timing)
At EOC and
Nap power down Not 3 stated 3 mA 200 ns Sample Start command
CONVST_QUAL = 0
Full power-down mode is activated by turning off the supply or by asserting PD to 1. See Figure 55 and
Figure 56 . The device can be resumed from full power down by either turning on the power supply or by
de-asserting the PD pin. The first two conversions produce inaccurate results because during this period the
device loads its trim values to ensure the specified accuracy.
If an internal reference is used (with a 1-µF capacitor installed between the REFOUT and REFM pins), the total
resume time (t
d18
) is 25 ms. After the first two conversions, t
d17
(4 ms) is required for the trimmed internal
reference voltage to settle to the specified accuracy. Only then the converted results match the specified
accuracy.
Figure 55. Device Full Power Down/Resume (Internal Reference Used)
Figure 56. Device Full Power Down/Resume (External Reference Used)
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