型号LOG2112
品牌
分类对数放大器
描述片上电压基准为 2.5V 的双通道精密对数和对数比放大器
相关操作
产品概述

参数

Scale factor (V/decade) 0.5
Input current range (min) (nA) 0.1
Input current range (max) (mA) 3.5
Offset voltage (input amplifiers) (max) (mV) 1.5
Vs (±) (min) (V) 4.5
Vs (±) (max) (V) 18
Iq (max) (mA) 3.5
Dynamic range (typ) (dB) 150
Reference type Internal
Auxiliary op amps 1
Full-scale output voltage (min) (±V) -3.8
Full-scale output voltage (max) (±V) 3.5
Conformity error (initial 5 decades) (max) (%) 0.2
Conformity error (initial 5 decades) (typ. over temp) (%/°C) 0.0001
Operating temperature range (°C) -40 to 85
Specified voltage (±V) 5
Rating Catalog

封装 | 引脚 | 尺寸

SOIC (DW) 16 106.09 mm² 10.3 x 10.3

特性

  • EASY-TO-USE COMPLETE FUNCTION
  • OUTPUT SCALING AMPLIFIER
  • ON-CHIP 2.5V VOLTAGE REFERENCE
  • HIGH ACCURACY: 0.2% FSO Over 5 Decades
  • WIDE INPUT DYNAMIC RANGE:
    7.5 Decades, 100pA to 3.5mA
  • LOW QUIESCENT CURRENT: 1.75mA
  • WIDE SUPPLY RANGE: ±4.5V to ±18V
  • PACKAGES: SO-14 (narrow) and SO-16
  • APPLICATIONS
    • LOG, LOG RATIO:
      Communication, Analytical, Medical, Industrial, Test, General Instrumentation
    • PHOTODIODE SIGNAL COMPRESSION AMP
    • ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D) CONVERTER
    • ABSORBANCE MEASUREMENT
    • OPTICAL DENSITY MEASUREMENT

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说明

The LOG112 and LOG2112 are versatile integrated circuits that compute the logarithm or log ratio of an input current relative to a reference current. VLOGOUT of the LOG112 and LOG2112 are trimmed to 0.5V per decade of input current, ensuring high precision over a wide dynamic range of input signals.

The LOG112 and LOG2112 features a 2.5V voltage reference that may be used to generate a precision current reference using an external resistor.

Low DC offset voltage and temperature drift allow accurate measurement of low-level signals over the specified temperature range of –5°C to +75°C.