LOG102 对数和对数比放大器
The LOG102 is a versatile integrated circuit that computes the logarithm or log ratio of an input current relative to a reference current.
The LOG102 is tested over a wide dynamic range of input signals. In log ratio applications, a signal current can be generated by a photodiode, and a reference current from a resistor in series with a precision external voltage reference.
In the block diagram shown below, A3 and A4 are identical, uncommitted op amps that can be used for a variety of functions, such as filtering, offsetting, adding gain or as a comparator to detect loss of signal.
The output signal at VLOG OUT is trimmed to 1V per decade of input current. It can be scaled with an output amplifier, either A3 or A4
| LOG102 | |
| Scale Factor (V/decade) | 1 |
| Input Current Range (Min) (nA) | 1 |
| Input Current Range (Max) (mA) | 1 |
| Conformity Error (initial 5 decades) (Max) (%) | 0.3 |
| Conformity Error (initial 5 decades) (typ. over temp) (%/degree C) | 0.0002 |
| Offset Voltage (Input Amplifiers) (Max) (mV) | 1.5 |
| Vs (+/-) (Min) (V) | 4.5 |
| Vs (+/-) (Max) (V) | 18 |
| Iq (Max) (mA) | 2 |
| Reference Type | External |
| Auxiliary Op Amps | 2 |
| Full-Scale Output Voltage (Min) (+/- V) | -4.1 |
| Full-Scale Output Voltage (Max) (+/- V) | 3.5 |
| Operating Temperature Range (C) | 0 to 70 |
| Pin/Package | 14SOIC |
| Rating | Catalog |
LOG102 特性
- EASY-TO-USE COMPLETE LOG RATIO FUNCTION
- OUTPUT AMPLIFIERS FOR SCALING AND SIGNAL LOSS INDICATION
- HIGH ACCURACY: 0.15% FSO Total Error Over 6 Decades
- WIDE INPUT DYNAMIC RANGE:
6 Decades, 1nA to 1mA - LOW QUIESCENT CURRENT: 1.25mA
- SO-14 PACKAGE
- APPLICATIONS
- ONET, OPTICAL POWER METERS
- LOG, LOG RATIO COMPUTATION: Communication, Analytical, Medical, Industrial, Test, General Instrumentation
- PHOTODIODE SIGNAL COMPRESSION AMP
- ANALOG SIGNAL COMPRESSION IN FRONT OF A/D CONVERTER
- ABSORBANCE MEASUREMENT
- OPTICAL DENSITY MEASUREMENT
LOG102 芯片订购指南
| 器件 | 状态 | 温度 | 价格 | 封装 | 引脚 | 封装数量 | 封装载体 | 丝印标记 |
| LOG102AID | ACTIVE | 0 to 70 | 8.70 | 1ku | SOIC (D) | 14 | 50 | TUBE | |
| LOG102AIDG4 | ACTIVE | 0 to 70 | 8.70 | 1ku | SOIC (D) | 14 | 50 | TUBE | |
| LOG102AIDR | ACTIVE | 0 to 70 | 7.25 | 1ku | SOIC (D) | 14 | 2500 | LARGE T&R | |
| LOG102AIDRG4 | ACTIVE | 0 to 70 | 7.25 | 1ku | SOIC (D) | 14 | 2500 | LARGE T&R |
LOG102 质量与无铅数据
| 器件 | 环保计划* | 铅/焊球涂层 | MSL 等级/回流焊峰 | 环保信息与无铅 (Pb-free) | DPPM / MTBF / FIT 率 |
| LOG102AID | Green (RoHS & no Sb/Br) | CU NIPDAUAG | Level-3-260C-168 HR | LOG102AID | LOG102AID |
| LOG102AIDG4 | Green (RoHS & no Sb/Br) | CU NIPDAUAG | Level-3-260C-168 HR | LOG102AIDG4 | LOG102AIDG4 |
| LOG102AIDR | Green (RoHS & no Sb/Br) | CU NIPDAUAG | Level-3-260C-168 HR | LOG102AIDR | LOG102AIDR |
| LOG102AIDRG4 | Green (RoHS & no Sb/Br) | CU NIPDAUAG | Level-3-260C-168 HR | LOG102AIDRG4 | LOG102AIDRG4 |
LOG102 应用技术支持与电子电路设计开发资源下载
- LOG102 数据资料 dataSheet 下载.PDF
- TI 德州仪器特殊功能放大器产品选型与价格 . xls
- 所选封装材料的热学和电学性质 (PDF 645 KB)
- 高速数据转换 (PDF 1967 KB)
- 使您的仪器放大器设计达到最佳效果 (zhct011.PDF, 897 KB)
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- Demystifying the Operational Transconductance Amplifier (sboa117.HTM, 8 KB)
- Using the LOG102 with the LOG102 to Generate 4mA to 20mA Output (PDF 167 KB)
- 在 PSPICE 中使用德州仪器 (TI) SPICE 模型 (zhca088.HTM, 8 KB)
- PowerPADTM Thermally Enhanced Package (slma002g.HTM, 8 KB)
- 运算放大器的单电源操作 (PDF 2174 KB)
- Tuning in Amplifiers (PDF 44 KB)
- Op Amp Performance Analysis (PDF 76 KB)
- An Error Analysis of the ISO102 in a Small Signal Measuring Application (PDF 29 KB)
- Level Shifting Signals with Differential Amplifiers (PDF 23 KB)
- Operational Amplifier Macromodels: A Comparison (PDF 59 KB)
LOG102 工具与软件
| 培训内容 | 型号 | 软件/工具类型 |
| LOG102EVM 评估模块 | LOG102EVM | 开发电路板/EVM |