Rainbow Electronics MAX188 - Manual (Page 16)

MAX186/MAX188
Low-Power, 8-Channel,
Serial 12-Bit ADCs
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Reference Reference- VREF Power- Power-Up Maximum
Buffer Buffer Capacitor Down Delay Sampling
Compensation (µF) Mode (sec) Rate (ksps)
Mode
Enabled Internal Fast 5µ 26
Enabled Internal Full 300µ 26
Enabled External 4.7 Fast See Figure 14c 133
Enabled External 4.7 Full See Figure 14c 133
Disabled Fast 2µ 133
Disabled Full 2µ 133
Table 5. Typical Power-Up Delay Times
PD1 PD0 Device Mode
1 1 External Clock Mode
1 0 Internal Clock Mode
0 1 Fast Power-Down Mode
0 0 Full Power-Down Mode
SHDN
Device Reference-Buffer
State Mode Compensation
1 Enabled Internal Compensation
Floating Enabled External Compensation
0 Full Power-Down N/A
Table 6. Software Shutdown and Clock Mode Table 7. Hard-Wired Shutdown and
Compensation Mode
POWERED UP
FULL
POWER
DOWN
POWERED
UP
POWERED UP
DATA VALID
(12 DATA BITS)
DATA VALID
(12 DATA BITS)
DATA INVALID VALID
EXTERNAL EXTERNAL INTERNAL
S X X X X X 1 1 S 0 1 X X X X X X X X X X S 1 1
FAST
POWER-DOWN
MODE
DOUT
DIN
CLOCK
MODE
SHDN
SETS EXTERNAL
CLOCK MODE SETS EXTERNAL
CLOCK MODE
SETS FAST
POWER-DOWN
MODE
Figure 12a. Timing Diagram Power-Down Modes, External Clock