Rainbow Electronics MAX1249 - Manual (Page 15)

POWERED UP
HARDWARE
POWER-
DOWN
POWERED UP
POWERED UP
10+2 DATA BITS 10+2 DATA BITS INVALID
DATA
VALID
DATA
EXTERNAL EXTERNAL
S X X X X X 1 1 S 0 0 X X X X X X X X X X S 1 1
SOFTWARE
POWER-DOWN
MODE
DOUT
DIN
CLOCK
MODE
SHDN
SETS EXTERNAL
CLOCK MODE SETS EXTERNAL
CLOCK MODE
SETS SOFTWARE
POWER-DOWN
POWER-DOWN
POWERED UP
POWERED UP
DATA VALID DATA VALID
INTERNAL
S X X X X X 1 0 S 0 0 X X X X X S
MODE
DOUT
DIN
CLOCK
MODE
SETS INTERNAL
CLOCK MODE SETS
POWER-DOWN
CONVERSION CONVERSION SSTRB
Figure 11a. Timing Diagram Power-Down Modes, External Clock
Figure 11b. Timing Diagram Power-Down Modes, Internal Clock
MAX1248/MAX1249
+2.7V to +5.25V, Low-Power, 4-Channel,
Serial 10-Bit ADCs in QSOP-16
______________________________________________________________________________________ 15
REFERENCE
BUFFER
REFERENCE-BUFFER
COMPENSATION
MODE
VREF
CAPACITOR
(µF)
POWER-DOWN
MODE
POWER-UP
DELAY
(µs)
MAXIMUM
SAMPLING RATE
(ksps)
Disabled — — Full 2 133
Enabled Internal — Fast 5 26
Enabled Internal — Full 300 26
Enabled External 4.7 Fast See Figure 13c 133
Enabled External 4.7 Full See Figure 13c 133
Disabled — — Fast 2 133
Table 4. Typical Power-Up Delay Times