本文介紹了 AD677 的基本性能、內部電路結構、自校原理、采樣時序及使用方法，
并給出了AD677 在電能計量應用中與單片機的接口電路，特別是數據串/并轉換電
路。實際應用結果表明，該芯片采樣精度高，工作穩定可靠，接口電路簡單。
關鍵詞 A/D 轉換;自校原理;采樣時序
Research on AD677 in the Precision of Measuring Instruments Zhang Hui Henan Economy and Trade Vocational College, Henan ZhengZhou, 450053 Zhengzhou University, Henan Zhengzhou, 450052 Abstract: This article introduces the basic properties of AD677, the internal structure of the circuit, since the school principle, timing and the use of sampling methods, and gives AD677 in the energy metering applications and MCU interface circuit, especially，data Series/ and conversion circuit. The results show that, the chip sampling of high precision, stable and reliable work, a simple interface circuit.
Key Words: A/D conversion; autocalibration; conversion timing