Specifications

55Sensors: Featured Products
Low-Power, Low-Noise, Multichannel Digital
Sensor Signal Conditioner Saves Cost and
Board Space
MAX1464
The MAX1464 is a highly integrated, digital, multichannel sensor signal conditioner
optimized for industrial process-control and automotive applications. Typical
implementations include pressure sensing, RTD and thermocouple linearization,
weight sensing/classication, and remote process monitoring with limit indication.
The MAX1464 simplies designs and improves manufacturing eciency by
accepting sensors with either single-ended or dierential outputs. It provides
comprehensive temperature compensation without requiring any external
trim components. A calibrated output signal can be driven independently
through an SPI-compatible interface, voltage-output DACs, or PWM outputs.
The MAX1464 integrates a 16-bit CPU, 128 bytes for user-programmable ash
memory, and two general-purpose inputs/outputs (GPIOs). It has a exible
dual op-amp output block and supports 4–20mA current loop applications.
Benefits
• Multichannel functionality reduces
BOM cost, improves performance, and
saves space
◦ Use one multichannel device for
lower cost and better measurement
matching compared with multiple
devices
◦ Highly integrated conditioner
minimizes component
requirements, saving board space
◦ No external trim components
required for a calibrated and
accurate output
• Adaptable compensation algorithm
optimizes sensor performance
◦ Algorithm can be customized for
the application
◦ Compensation algorithm is stored in
on-chip nonvolatile flash memory
• Reduces product development time
◦ Flexible for use in products
requiring digital output, voltage
output, PWM output, or a 4–20mA
current loop
◦ Integrated microprocessor with only
16 instructions makes programming
easy
◦ Suitable for use with many types of
transducers
INP1
V
DDF
V
DD
INM1
INP2
INM2
22Ω
GPIO
N
RTD
R
REF
RT*
SENSOR
0.1μf
SYSTEM
CONTROL
UNIT
OUT
N
LG
OUT, RTD
OUT
N
SM
OUT, BRIDGE
0.1μf
5V
GND
100pf 100pf
V
SS
DIGITAL INTERFACE
MAX1464
* RT is a resistor with a negligible tempco (TC) or a well-known TC .
The MAX1464 multichannel digital signal conditioner measures one differential and two single-ended inputs.