标准摘要
[中文适用范围]： 本标准（IEC 60122-2:2025）的制定，旨在回应用户与制造商的普遍诉求，为石英晶体谐振器在滤波器及振荡器中的应用提供指导性准则，以充分发挥其性能优势。 本文档提请用户关注在为新应用订购谐振器前需考虑的一些基本问题，以期有助于避免性能不佳、成本过高以及产品缺货等问题。需明确的是，本文档并非用于阐述理论基础，亦不试图涵盖实际应用中可能出现的各种情况。此外，本文档亦不能替代制造商与用户之间的密切沟通。 标准规范（如 IEC 发布的标准规范，本文档即为其中之一）、国家规范或制造商发布的详细规格书，将定义谐振特性与温度特性之间的可用组合。这些规范的编制旨在涵盖一系列具有标准化性能的石英晶体谐振器。必须强调的是，只要条件允许，用户应优先从上述规范中选择石英晶体谐振器，即使为此需要对电路进行微小调整以适应标准谐振器的使用。这一点在选择标称频率时尤为重要。 与前一版相比，本版主要进行了以下技术修订： a) 新增 SC 切型及其相关要求； b) 新增老化计算及根据通用规范规定的低驱动电平要求； c) 根据通用切型要求更新了频率 - 温度曲线； d) 删除了使用频率较低的产品类型。 [外文原描述]： IEC 60122-2:2025 has been compiled in response to a generally expressed desire on the part of both users and manufacturers for guidelines to the use of quartz crystal units for filters and oscillators so that the crystal units may be used to their best advantage. It draws attention to some of the more fundamental questions which will be considered by the user before it places its order for a unit for a new application, and in so doing will, it is hoped, help ensure against unsatisfactory performance, unfavourable cost and non-availability. It is not the function of this document to explain theory, nor to attempt to cover all the eventualities that can arise in practical circumstances. Lastly, it it is not considered as a substitute for close liaison between manufacturer and user. Standard specifications, such as those of the IEC of which these guidelines form a part, and national specifications or detail specifications issued by manufacturers, will define the available combinations of the resonant characteristics and the temperature characteristic. These specifications are compiled to include a wide range of quartz crystal units with standardized performances. It cannot be over-emphasized that it is the responsibility of the user , wherever possible, to select the quartz crystal units from these specifications, when available, even if it can lead to making small modifications to the circuit to enable the use of standard resonators. This applies particularly to the selection of the nominal frequency. This edition includes the following significant technical changes with respect to the previous edition: a) addition of SC cut type and related requirements; b) addition of ageing calculation and low level of drive requirements according to the general specification, c) update of the frequency temperature curve according to the common cut requirements; d) removal of infrequently used product types.
英文名称Quartz crystal units of assessed quality - Part 2: Guidelines for the use