• - 交流-直流(AC-DC)控制器和稳压器
• - 直流-直流(DC-DC)控制器、转换器和稳压器
• - 电压和电流管理
• - 通讯IC
• - 驱动器
• - 热管理

• - 时钟及数据分配
• - 标准逻辑

• - 放大器和比较器
• - 模拟开关
• - 数字电位计
• - 接口
• - EMI和RFI滤波器

• - EEPROM存储器
• - 非易失性只读存储器(NVRAM)
• - SRAM存储器

说明

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 V_{LOG OUT} is trimmed to 1V per decade of input current. It can be scaled with an output amplifier, either A3 or A4.

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

NOTE: U.S. Patent Pending.
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