13 fCLKs
WARMUP
44 fCLKs
CONVERSION
CYCLES 2–12
REFERENCE
SAMPLING
3 fCLKs
SUBTRACTION
AND WRITE TO
OUTPUT REGISTER
48 fCLKs
CONVERSION CYCLES 1–12
13 fCLKs
WARMUP
INPUT
ACQUISITION
INPUT
ACQUISITION
SSTRB
FCLK
4 fCLKs
CONVERSION CYCLE 1
FIRST CONVERSION
SECOND CONVERSION
MAX1098/MAX1099
10-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
_______________________________________________________________________________________
13
input sampling capacitance of the ADC (4pF). Source
impedances below 100k
have no significant effect on
MAX1098/MAX1099 AC performance.
Analog Input Protection
Internal protection diodes clamp the analog inputs to
VDD and GND so channels can swing within GND -
0.3V and VDD + 0.3V without damage. However, for
accurate conversions, the inputs should not extend
beyond the supply rails.
If an off-channel analog input extends beyond the
supply rails, limit the input current to 2mA.
Serial Digital Interface
The MAX1098/MAX1099 feature a serial interface that is
fully compatible with SPI, QSPI, and MICROWIRE
devices. For SPI/QSPI, ensure that the CPU serial inter-
face runs in master mode so it generates the serial
clock signal. Select a 2.5MHz clock frequency or less,
and set zero values for clock polarity (CPOL) and
phase (CPHA) in the P control registers. Figure 4
shows detailed serial interface timing information. See
Tables 1–4 for programming information.
13 fCLKs
WARMUP
3 fCLKs
WRITE TO OUTPUT
REGISTER
INPUT
ACQUISITION
FCLKS
SSTRB
FCLK
REF
ACQUISITION 1
REF
ACQUISITION 2
CONVERSION CYCLE 1
CONVERSION CYCLES 2–12
REFERENCE SAMPLING
Figure 3b. Temperature Conversion Timing Diagram
Figure 3a. Voltage Conversion Timing Diagram
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