LTZ1000pc-v2b.pdf

LTZ1000 - 超精准型基准 电压基准 Home产品分类信号调理电压基准并联基准LTZ1000 并联基准 串联基准 具比较器或放大器的基准 - LTZ1000 - 超精准型基准 特点 1.2μVP-P 噪声 2μV/√kHr 的长期稳定性 非常低的迟滞 0.05ppm/℃ 的漂移 实现了温度的稳定 LTZ1000A 的 400℃/W 热阻降低了热绝缘要求 具 -55℃ 至 125℃ 的规定温度范围 采用 TO-99 封装 描述 LTZ1000 和 LTZ1000A 是超稳定温度可控型基准它们专为提供具 0.05ppm/℃ 温度漂移的 7V 输出、约 1.2 μVP-P 的噪声和 2μV/√kHr 的长期稳定性而设计 在芯片上集成了一个近表面齐纳基准、一个用于实现温度稳定性的加热电阻器和一个温度检测晶体管外部电 路用于设定工作电流，并对基准进行温度稳定处理这提供了最大的灵活性以及最佳的长期稳定性和噪声性能 与老款器件 (比如：LM199)相比，LTZ1000 和 LTZ1000A 基准能够提供更加出色的性能 (前提是用户实施了加 热器控制，并对热布局进行了正确的管理)为了简化热绝缘，LTZ1000A 采用了一种专有的芯片连接方法，旨 在提供明显高于 LTZ1000 的热阻。

订购信息 以 PBF 结尾的器件型号表示这些是无铅型器件如需了解有关含铅涂层器件的信息，请与凌力尔特公司联系 型号当中包含 TR 或 TRM 的器件分别采用卷带装或 500 片微型卷带装的形式进行装运 如需了解更多的细节，请查阅我们一般订购信息或产品数据手册 各种封装型式和定价 器件型号 封装 引脚 温度 价格 (以 1 ~ 99 片为批量) 价格 (以 1000 片为批量)* RoHS 数据 LTZ1000ACH METAL CAN 8 C $54.50 $44.80 视图 LTZ1000ACH#PBF METAL CAN 8 C $54.50 $44.80 视图 LTZ1000CH METAL CAN 8 C $42.85 $35.20 视图 LTZ1000CH#PBF METAL CAN 8 C $42.85 $35.20 视图 应用 伏特计 校准器 标准电池 衡器 低噪声 RF 振荡器 ==PIN FUNCTIONS 引脚功能== Pin 1: Heater Positive. Must have a higher positive value than Pin 2 and Pin 4. 引脚 1 ：加热器正极的。

必须高于引脚 2 和引脚 4 的电压 Pin 2: Heater Negative. Must have a higher positive value than Pin 4. Must have equal or lower potential than Pin 1. 引脚 2 ：加热器的负极 必须比引脚 4 的电压高，必须比引脚 1 的有相等或更低电压 Pin 3: Zener Positive. Must have a higher positive value than Pin 4. 引脚 3 ：齐纳管正极必须高于引脚 4 的电压 Pin 4: Substrate and Zener Negative. Must have a higher positive value than Pin 7. If Q1 is zenered (about 7V) a permanent degradation in beta will result. 引脚 4 ：衬底和齐纳管的负极 必须高于引脚 7 的电压 如果 Q1 是齐纳击穿后（约 7 V ）的会永久丧失共 发射极短路电流放大能力（β） Pin 5: Temperature Compensating Transistor Collector. 引脚 5 ：温补晶体管的集电极。

Pin 6: Temperature Sensing Transistor Base. If the base emitter junction is zenered (about 7V) the transistor will suffer permanent beta degradation. 引脚 6 ：测温晶体管基极如果该 EB 结的齐纳击穿后 （约 7 V ）晶体管将永久丧失共发射极短路电流放大能 力（β） Pin 7: Emitter of Sensing and Compensating Transistors. 引脚 7 ：测温和温补晶体管的发射极 Pin 8: Collector of Sensing Transistor. 引脚 8 ：测温晶体管集电极 ==APPLICATIONS INFORMATION 应用信息== LTZ1000 and LTZ1000A are capable of providing ultimate voltage reference performance. LTZ1000 和 LTZ1000A 能提供终极高精密电压基准 Temperature drifts of better than 0.03ppm/°C and long-term stability on the order of 1μV per month can be achieved. Noise of about 0.15ppm can also be obtained. This performance is at the expense of circuit complexity, 温漂优于 0.03ppm/°C 和长期稳定性 1μV/月，噪声约 0.15ppm。

这些指标是通过复杂的电路取得的 since external influences can easily cause output voltage shifts of more than 1ppm. 由于外部的影响可以很容易造成输出电压的变化超过 1ppm Thermocouple effects are one of the worst problems and can give apparent drifts of many ppm/°C as well as cause low frequency noise. 热电动势效应是最严重的问题之一，它会明显劣化漂移及低频噪声 The kovar input leads of the TO-5 package form thermocouples when connected to copper PC boards. These thermocouples generate outputs of 35 μ V/ ° C. It is mandatory to keep the zener and transistor leads at the same temperature, otherwise1ppmto5ppmshiftsintheoutputvoltagecaneasilybeexpectedfromthese thermocouples. 器件 TO-5 封装的镍钴合金引脚与电路板铜箔产生的热电动势约为 35μV/°C。

应把齐纳管和晶体管引脚保持相 同温度，否则会造成输出电压 1-5ppm 的漂移 Air currents blowing across the leads can also cause small temperature variations,especially since the package is heated. 气流吹流过引脚亦会导致温度发生小变化，尤其是管子是被加热的 This will look like 1ppm to 5ppm of low frequency noise occurring over a several minute period. 这看起来就像 1-5ppm 的低频噪声，周期为几分钟 For best results, the device should be located in an enclosed area and well shielded from air currents. 为获得最佳效果，装置应放在封闭容器内，并进行热屏蔽 Certainly, any temperature gradient externally generated, say from a power supply, should not appear across the critical circuitry. 当然，任何外部温度变化比如供电，不应跨越的关键电路。

The leads to the transistor and zener should be connected to equal size PC traces to equalize the heat loss and maintain them at similar temperatures. 晶体管和齐纳管的走线应使用相同的线宽来平衡热损失和保持相近的温度 The bottom portion of the PC board should be shielded against air currents as well. 电路板的底部应热绝缘，防止气流 Resistors, as well as having resistance temperature coefficients, can generate thermocouple effects. Some types of resistors can generate hundreds of microvolts of thermocouple voltage. 电阻也有温度系数，可以产生热电动势某些类型的电阻会产生几百微伏的热电动势。

These thermocouple effects in the resistor can also interfere with the output voltage. 电阻热电动势也会影响输出电压 Wirewoundresistorsusuallyhavethelowestthermocouplevoltage,whiletinoxidetype resistors have very high thermocouple voltage. Film resistors, especially Vishay precision film resistors, can have low thermocouple voltage. 线绕电阻通常有最低的热电动势，而锡氧化物型电阻器有很高的热电动势薄膜电阻，尤其是Vishay(威世)的 精密薄膜电阻器拥有低的热电动势 Ordinary breadboarding techniques are not good enough to give stable output voltage with the LTZ1000 family devices. 普通试验板的技术不能能让 LTZ1000 家族很好地提供稳定的输出电压。

For breadboarding, it is suggested that a small printed circuit board be made up using the reference, the amplifier and wire wound resistors. 对于试验板方法，建议在一个小印刷电路板安放基准、放大器和线绕电阻 Care must be taken to ensure that heater current does not flow through the same ground lead 。