LT1991 精准、100μA 增益可选放大器
LT®1991 将一个精准的运算放大器和 8 个精准电阻器集成为一个单芯片解决方案，旨在实现电压的精确放大。可在未采用任何外部组件的情况下获得数值为 -13 至 14 的增益 (增益准确度为 0.04%)。该器件尤其适合用作一个差分放大器，此时，其卓越的电阻器匹配性能将实现一个大于 75dB 的共模抑制比。
该放大器具有一个 50µV 的最大输入失调电压和一个 560kHz 的增益带宽乘积。该器件的工作电源电压范围为 2.7V 至 36V，当采用一个 5V 电源时，其吸收的电源电流仅为 100µA。输出摆幅在每个电源轨的 40mV 范围之内。
这些电阻器具有超群的匹配特性，对于阻值为 450k 的电阻器，其匹配精度在整个工作温度范围内为 0.04%。匹配温度系数保证小于 3ppm/°C。这些电阻器与电压之间具有极佳的线性关系，从而实现了一个小于 10ppm 的增益非线性度。
LT1991 的所有技术规格都是针对 5V 和 ±15V 电源以及 -40°C 至 125°C 的温度范围而拟订的。该器件采用节省空间的 10 引脚 MSOP 和扁平 (高度仅 0.8mm) 的 3mm x 3mm DFN 封装。
产品特点 Features
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LT1991 订购信息和价格参考Package Variations and Pricing
| 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) * |
| LT1991ACDD | DFN | 10 | C | $2.52 | $2.09 |
| LT1991ACDD#PBF | DFN | 10 | C | $2.52 | $2.09 |
| LT1991ACDD#TR | DFN | 10 | C | $2.15 | |
| LT1991ACDD#TRPBF | DFN | 10 | C | $2.15 | |
| LT1991ACMS | MSOP | 10 | C | $2.28 | $1.89 |
| LT1991ACMS#PBF | MSOP | 10 | C | $2.28 | $1.89 |
| LT1991ACMS#TR | MSOP | 10 | C | $1.95 | |
| LT1991ACMS#TRPBF | MSOP | 10 | C | $1.95 | |
| LT1991AIDD | DFN | 10 | I | $3.01 | $2.49 |
| LT1991AIDD#PBF | DFN | 10 | I | $3.01 | $2.49 |
| LT1991AIDD#TR | DFN | 10 | I | $2.55 | |
| LT1991AIDD#TRPBF | DFN | 10 | I | $2.55 | |
| LT1991AIMS | MSOP | 10 | I | $2.77 | $2.29 |
| LT1991AIMS#PBF | MSOP | 10 | I | $2.77 | $2.29 |
| LT1991AIMS#TR | MSOP | 10 | I | $2.35 | |
| LT1991AIMS#TRPBF | MSOP | 10 | I | $2.35 | |
| LT1991CDD | DFN | 10 | C | $2.10 | $1.59 |
| LT1991CDD#PBF | DFN | 10 | C | $2.10 | $1.59 |
| LT1991CDD#TR | DFN | 10 | C | $1.65 | |
| LT1991CDD#TRPBF | DFN | 10 | C | $1.65 | |
| LT1991CMS | MSOP | 10 | C | $1.80 | $1.39 |
| LT1991CMS#PBF | MSOP | 10 | C | $1.80 | $1.39 |
| LT1991CMS#TR | MSOP | 10 | C | $1.45 | |
| LT1991CMS#TRPBF | MSOP | 10 | C | $1.45 | |
| LT1991HDD | DFN | 10 | H | $2.30 | $1.90 |
| LT1991HDD#PBF | DFN | 10 | H | $2.30 | $1.90 |
| LT1991HDD#TR | DFN | 10 | H | $1.96 | |
| LT1991HDD#TRPBF | DFN | 10 | H | $1.96 | |
| LT1991HMS | MSOP | 10 | H | $2.05 | $1.69 |
| LT1991HMS#PBF | MSOP | 10 | H | $2.05 | $1.69 |
| LT1991HMS#TR | MSOP | 10 | H | $1.75 | |
| LT1991HMS#TRPBF | MSOP | 10 | H | $1.75 | |
| LT1991IDD | DFN | 10 | I | $2.30 | $1.90 |
| LT1991IDD#PBF | DFN | 10 | I | $2.30 | $1.90 |
| LT1991IDD#TR | DFN | 10 | I | $1.96 | |
| LT1991IDD#TRPBF | DFN | 10 | I | $1.96 | |
| LT1991IMS | MSOP | 10 | I | $2.05 | $1.69 |
| LT1991IMS#PBF | MSOP | 10 | I | $2.05 | $1.69 |
| LT1991IMS#TR | MSOP | 10 | I | $1.75 | |
| LT1991IMS#TRPBF | MSOP | 10 | I | $1.75 |
LT1991 数据手册及相关资料下载
- 数据手册(英文) : LT1991 - Precision, 100µA Gain Selectable Amplifier.PDF
- 设计要点 (英文) : DN448 - 12-bit DAC in TSOT-23 Includes Bidirectional REF Pin for Connection to Op Amp or External High Precision Reference.PDF
- 设计要点 (英文) : DN348 - Precise Gain Without External Resistors.PDF
- 设计要点 (中文) : DN348 - 在未采用外部电阻器的情况下获取精准增益.PDF
- 可靠性数据 : R423 Reliability Data .PDF
- 产品新闻发布 (英文) : LT1991 - Product Press Release.PDF
