Specifications

56 Control and Automation Solutions Guide
High-Performance Sensor Signal Conditioner
with Fully Analog Signal Path
MAX1454
The MAX1454 is a high-performance, robust, reliable, and highly integrated
sensor signal conditioner. The fully analog signal path provides amplication,
calibration, and temperature compensation of the input signal while introducing
no quantization noise to the signal. Oset and span are calibrated with
integrated 16-bit DACs, allowing sensors to be truly interchangeable. Features
such as 45V over/reverse voltage protection, output current limiting, and input
sensor fault detection enable development of robust and reliable products.
The MAX1454 architecture includes programmable sensor excitation, a 32-
step PGA, 2K x 8 bits internal ash memory, four 16-bit DACs, and an on-
chip temperature sensor. In addition to oset and span compensation, the
device provides a unique temperature-compensation method for oset
TC and FSO TC to oer a remarkable degree of exibility while minimizing
manufacturing costs. The device is packaged in a 16-pin TSSOP package
and can operate over the -40°C to +125°C extended temperature range.
Benefits
• Integration provides high accuracy
with reduced BOM cost
◦ Four 16-bit DACs (76V resolution)
provide accurate compensation of
FSO and offset
◦ Multitemperature compensation
allows sensor calibration that
approaches repeatability of the
input signal
◦ Highly integratedrequires no
external trim components to
produce calibrated and accurate
output
◦ Simple 3-wire (V
DDX
, GND, OUT/DIO)
sensor connection
• Improves system robustness and
reliability
◦ 45V over/reverse voltage protection
protects against power surges and
operator error
◦ Output current limit protects
against unintentional shorting of
the output pin to supply or ground
◦ Input fault detection provides
warning of bad sensor and allows
for preventive/protective action
• Simplifies sensor selection by
accommodating wide range of sensors
◦ Operates with wide supply range
(3V to 5.5V)
◦ Accepts wide range of sensor
sensitivity (1mV/V to 200mV/V)
The MAX1454 signal conditioner uses a fully analog signal path to avoid quantization noise.
IN-
IN+
BDR
V
DDX
0.1µF
V
DDF
OUT/DIO
SENSOR
GND
V
DD
0.1µF 0.01µF
OUT/DIO
+5V
GND
MAX1454