Precision Sensor Signal Conditioner with Overvoltage Protection

The MAX1454 is a highly integrated analog sensor signal conditioner targeted for automotive applications. The device provides amplification, calibration, and temperature compensation to enable an overall performance approaching the inherent repeatability of the sensor. The fully analog signal path introduces no quantization noise in the output signal while enabling digitally controlled trimming of the output. Offset and span are calibrated with integrated 16-bit DACs, allowing sensors to be truly interchangeable.

The device architecture includes a programmable sensor excitation, a 32-step programmable-gain amplifier (PGA), a 2K x 8 bits internal flash memory, four 16-bit DACs, and an on-chip temperature sensor. In addition to offset and span compensation, the device provides a unique temperature-compensation method for offset TC and FSO TC to provide a remarkable degree of flexibility while minimizing manufacturing costs.

The device is packaged in a 16-pin TSSOP and covers the automotive AEC-Q100 Grade 1 temperature range of -40°C to +125°C.

Applications

* Humidity Sensors * Pressure Calibrators and Controllers * Pressure Sensors * Resistive Element Sensors * Strain Gauges

* Complete Signal Conditioning in a Single IC Package

* Provides Amplification, Calibration, and Temperature Compensation

* Accommodates Sensor Output Sensitivities from 1mV/V to 200mV/V

* Overvoltage Protection to 45V

* Reverse-Voltage Protection to 45V

* High-Precision Compensation Reduces Downstream Circuit Complexity

* Fully Analog Signal Path

* 16-Bit Offset and Span-Calibration Resolution

* On-Chip Lookup Table Supports Multipoint Calibration Temperature Correction

* Supports Both Current and Voltage-Bridge Excitation

* Fast 85µs Step Response

* Sensor Fault Detection

* Simple PCB Layout

* Single-Pin Digital Programming

* No External Trim Components Required