Single-Supply, Low-Power,

2-Channel, Serial 8-Bit ADCs

10

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During the conversion process, SCLK is ignored. Only

after a conversion is complete will SCLK cause serial

data to be output. Falling edges on CNVST, during an

active conversion process, interrupt the current conver-

sion and cause the input multiplexer to switch to CH1.

To reinitiate a conversion on CH0, it is necessary to

allow for a conversion to be complete and all of the

data to be read out. Once a conversion has been com-

pleted, the MAX1117/MAX1118/MAX1119 will go into

AutoShutdown™ mode (<1µA typ) until the next conver-

sion is initiated.

ACTIVE

POWER-DOWN MODE

CNVST

SCLK

DOUT

CH0

IDLE LOW

IDLE LOW

CH0

D7 (MSB)

D6

D5

D4

D3

D2

D1

D0

Figure 6a. Conversion and Interface Timing, Conversion on CH0 with SCLK Idle Low

ACTIVE

POWER-DOWN MODE

CNVST

SCLK

DOUT

CH0

IDLE HIGH

IDLE HIGH

CH0

D7 (MSB)

D6

D5

D4

D3

D2

D1

D0

Figure 6b. Conversion and Interface Timing, Conversion on CH0 with SCLK Idle High

AutoShutdown is a trademark of Maxim Integrated Products.