Specifications

Sensors
Pressure sensors and weigh scales (force sensing)
www.digikey.com/maxim-industrial 63
Benefits
• Distinguish signals better by matching
sensor’s output range to the ADC’s
input range
– On-chip PGA allows as low as 20mV
full-scale range (FSR) to match sensor
output
• High integration reduces design
complexity
– Built-in self- and system-calibration
modes improve accuracy and shorten
design time
– Built-in digital filter for 50Hz/60Hz
rejection removes unwanted power-line
interference
• Simplify design with features
optimized for multichannel ratiometric/
bridge-type designs
– Differential reference input for
ratiometric measurement common to
bridge-type circuits
– Two differential channels measure
pressure and temperature (common
dependency)
MAX1415/MAX1416, MX7705
Pressure sensors commonly have high temperature dependence.
Therefore, the design should monitor temperature while measuring
pressure. The MAX1415 features differential reference inputs which
allow ratiometric measurement of the 3V excitation voltage. The two
differential inputs allow pressure and temperature (using a resistance
temperature detector, RTD) to be monitored with a single ADC.
Flexible ADCs interface with a wide range of sensors
AIN1+
AIN1−
AIN2+
V3
SPI™
INTERFACE
AIN2−
REF+ REF−
HEL 777
RTD
R1
NPI-19 SERIES
NovaSensor
®
PRESSURE SENSOR
V
S1
V
S2
MAX1415
Flexible MAX1415 ADC interfaces with pressure and temperature sensors.