PSØ21 - Digital Amplifier for Strain Gages

Up to 2 full- or 4 halfbridges
Up to 2 Wheatstone bridges
Capable of driving only a halfbridge without any loss in precision
For compensated or non-compensated bridges
Adaptation of compensation resistor's Tk by software
Offset and span compensation internally separated (mathematically), therefore no need to trim the bridge offset
Resistance strain gauge: 350 Ohm to 10 kOhm
Programmable resolution: Up to 19 Bit (20nV rms or 500,000 scale div) @ 2 mV/V strain and 5 Hz update rate
High Measurement rate: Up to 50 kHz with high resolution (12.4 ENOB @ 4 kHz and 2 mV/V max. strain)
Extremely low current consumption possible: Down to
15 µA (incl. SG) at 1 Hz and 10 ENOB with 1 kOhm SG and 1000 µ strain
High stability with temperature, low gain error (< 1 ppm/K)
No need for a pre-amplifier
No separate supply of SG
No separate reference voltage
Optional Single-conversion mode
Separate temperature measurement
Optional capacity measurement
Serial interface (SPI compatible)
Supply voltage I/O and SG: 1.8 ... 5.5 V
Separate Supply for interface I/Os
Supply voltage PSØ21: 1.8 ... 3.6 V
Op. temperature range -40°C ... +120°C
QFN48 / QFP48 package (body size 7 x 7 mm²)