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Ｄ／Ａ，Ａ／Ｄ变换器是 ＡＤＳＬ系统中的重要组成部分。 Ｄ／Ａ，Ａ／Ｄ变换器的分辨率越高，系统性能越好，但系统成本也越高。系统设计时需要兼顾两方面的要求．通过理论分析，给出了在确保系统性能的情况下，Ｄ／Ａ，Ａ／Ｄ变换器的最小分辨率的确定方法。
D / A, A / D converter is an important part of ADSL system. D / A, A / D converter resolution higher, the better the system performance, but the higher the system cost. System design needs to take into account both requirements. Through the theoretical analysis, the method of determining the minimum resolution of D / A converter is given in order to ensure the system performance.