16 bit 250kHz analog-to-digital converter GX8509 replaces ADS8509 for application in medical equipment

Home medical monitoring and surveillance systems can help people control their health status, but these medical devices must be fast, efficient, and able to ensure work at the most important times. Medical devices generally require the integration of multiple signal conditioning circuits, including amplifiers, filters, reference sources, and analog-to-digital converters, in order to distinguish and recognize sensor signals. ADS8509 is a classic 16 bit, 250kSPS successive approximation analog-to-digital converter that has been widely used in various medical devices for a long time. Guoxin Sichen‘s GX8509, as an alternative to GXSC, provides a new replacement solution for medical device design.

The core of an analog circuit is an analog-to-digital converter that converts analog readings from sensors into digital results. The digital results can be stored in memory or displayed on a screen. For most medical sensor applications, the best choice for a data converter would be a successive approximation register ADC.

GX8509 is a 16 bit analog-to-digital converter that adopts an advanced CMOS structure. It has an internal 16 bit SAR A/D converter with functions such as sample and hold, reference, clock, and serial data interface. Data can not only be output using internal clocks, but also synchronized with external data clocks. The chip has a rated sampling rate of up to 250kHz across the entire temperature range; Precision resistors provide various input ranges such as ± 10V and 0-5V, and can also achieve power consumption below 100mW under single+5V power supply operating conditions. In addition, digital power supplies are compatible with 3.3V~5.5V power supply.

• Input range: 4V, 5V, 10V, ± 3.3V, ± 10V, ± 5V

• ±8LSB INLMAX , ±0.5LSB DNLMAX

16 bit no loss code

SPI serial output with daisy chain (TAG) function

5V analog power supply

• Supports 3.3V~5.5V digital power supply

• Use internal or external references

The typical power consumption at 250KSPS is 70mW

• Simple DSP interface