The JHM1203 is a high accuracy signal conditioning IC designed for differential resistive bridge sensor signals for high resolution altimeter module applications. A low-noise instrumentation amplifier with gain and offset tuning capability amplifies the input bridge signal to a level which fits the input range of a 24-bit delta-sigma A/D converter. The digitized input is compensated up to 2^nd order for thermal drifts of offset and gain as well as non-linearity in digital domain. A temperature signal from an on-chip sensor is digitized and fed to the compensation circuit, too. The compensation coefficients can be written to the on-chip programmable non-volatile memory (OTP). The measured and corrected bridge values and temperature values can be read through the I²C interface.

Features

• High linearity of internal temperature sensor, provide temperature measurement for compensations

• Programmable interrupt control

• High accuracy 24-bit Σ-ΔADC

• Programmable gain of the pre-amplifier 13.2x~72x

• High accuracy （±0.1%FSO@-25~+125°C）

• Digitally correct offset, gain, linearity over temperature. Second-order compensation can be enabled for temperature coefficients of gain, offset and linearity

• Current consumption depends on programmed sample rate. Average current 0.5mA when working at maximum sampling rate. Standby current is 0.1μA

JHM120X Block Diagram