Datasheet

MAX11634–MAX11637
12-Bit, 300ksps ADCs with Differential
Track/Hold, and Internal Reference
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Detailed Description
The MAX11634–MAX11637 are low-power, serial-out-
put, multichannel ADCs for temperature-control,
process-control, and monitoring applications. These
12-bit ADCs have internal track and hold (T/H) circuitry
that supports single-ended and fully differential inputs.
Data is converted from analog voltage sources in a
variety of channel and data-acquisition configurations.
Microprocessor (µP) control is made easy through a 3-
wire SPI/QSPI/MICROWIRE-compatible serial interface.
Figure 2 shows a simplified functional diagram of the
MAX11634–MAX11637 internal architecture. The
MAX11636/MAX11637 have eight single-ended analog
input channels or four differential channels. The
MAX11634/MAX11635 have four single-ended analog
input channels or two differential channels.
SCLK
DIN
DOUT
CS
t
DH
t
DOE
t
DS
t
CH
t
CL
t
CSS0
t
CP
t
CSH1
t
CSH0
t
CSS1
t
DOD
t
DOT
Figure 1. Detailed Serial-Interface Timing Diagram
12-BIT
SAR
ADC
CONTROL
SERIAL
INTERFACE
OSCILLATOR
FIFO AND
ACCUMULATOR
T/H
REF-
CNVST
SCLK
CS
DIN
EOC
DOUT
AIN7
AIN0
AIN1
INTERNAL
REFERENCE
REF+
MAX11634–MAX11637
Figure 2. Functional Diagram