Six sensor inputs in one IC deliver ultimate flexibility and miniaturisation

Signal-amplification circuitry built into the Semtech SX8724 sensor-interface device allows direct connection to six different types of sensors, delivering a versatile sensor platform that designers can use across a range of products.

Measuring 4mm x 4mm, the SX8724 is small enough to be embedded within a sensor enclosure, and allows electronics to be co-located with the sensor to generate direct digital outputs. A wide variety of magnetic, pressure or chemical sensors are supported, including direct reading of most Wheatstone Bridge sensors.

By incorporating Semtech’s ZoomingADC™ technology, the SX8724 integrates a 10-bit preamplifier with a programmable gain of between 0.1 and 1,000, as well as a 16-bit ADC. The preamplifier delivers the highest gain on the market giving designers the freedom to achieve a given level of sensitivity using lower cost sensors.

A low operating voltage, combined with the ability to optimise resolution, speed and current independently, allow use with a single Li-lon battery without losing 16-bit precision even when the battery is depleted. The device operates from 2.4V to 5.5V, and typically draws 200µA for 16-bits at 1kHz.

 

FEATURES Four digital outputs to bias sensors On-chip RC oscillator Internal time base Internal or external voltage reference Wide range of sensor types supported

APPLICATIONS Portable, battery-operated instruments Wireless sensor networks 4-20mA loop-powered sensors Industrial sensing Meteorological instruments

 

 

 

• Ramtron’s FM6124, page 080905

 

Semtech / SX8724