Datasheet

MAX1117/MAX1118/MAX1119
Single-Supply, Low-Power,
2-Channel, Serial 8-Bit ADCs
10 ______________________________________________________________________________________
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
t
csh
t
conv
t
cp
t
ccs
t
chz
t
cl
t
cd
D7 (MSB) D6 D5 D4 D3 D2 D1 D0
t
csd
t
ch
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
t
csh
t
conv
t
cp
t
ccs
t
chz
t
cl
t
cd
D7 (MSB) D6 D5 D4 D3 D2 D1 D0
t
csd
t
ch
Figure 6b. Conversion and Interface Timing, Conversion on CH0 with SCLK Idle High
AutoShutdown is a trademark of Maxim Integrated Products.