AN1827 ST7FLITE05/09实现Ȉ-ΔADC

AN1827 ST7FLITE05/09实现Ȉ-ΔADC

AN1827
APPLICATION NOTE
IMPLEMENTATION OF SIGMA-DELTA ADC
WITH ST7FLITE05/09

INTRODUCTION
The purpose of this document is to describe how to implement a 10-bit Sigma-Delta A/D con-
verter using a simple external circuit and a Sigma-Delta conversion program.
The ST7FLITE05(09) has an on-chip ADC with 8-bit resolution and an input range of 0-VCC.
The external Sigma-Delta ADC described in this application is designed for relatively slow al-
ternating signals (0,2 - 5Hz) in the range 0 - 10mV(p-p). The focus of the project is to provide
good relative accuracy, repeatable parameters and simplicity, resu