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LOG114

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具有 2.5V 基准电压和非限定输出运算放大器的精密高速对数放大器

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LOG114

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产品详情

Scale factor (V/decade) 0.375 Input current range (min) (nA) 0.1 Input current range (max) (mA) 10 Offset voltage (input amplifiers) (max) (mV) 4 Vs (±) (min) (V) 4.8 Vs (±) (max) (V) 11 Iq (max) (mA) 15 Dynamic range (typ) (dB) 160 Reference type Internal Auxiliary op amps 2 Full-scale output voltage (min) (±V) -4.4 Full-scale output voltage (max) (±V) 4.4 Conformity error (initial 5 decades) (max) (%) 0.2 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 0.1 Operating temperature range (°C) 0 to 70 Specified voltage (±V) 5 Rating Catalog
Scale factor (V/decade) 0.375 Input current range (min) (nA) 0.1 Input current range (max) (mA) 10 Offset voltage (input amplifiers) (max) (mV) 4 Vs (±) (min) (V) 4.8 Vs (±) (max) (V) 11 Iq (max) (mA) 15 Dynamic range (typ) (dB) 160 Reference type Internal Auxiliary op amps 2 Full-scale output voltage (min) (±V) -4.4 Full-scale output voltage (max) (±V) 4.4 Conformity error (initial 5 decades) (max) (%) 0.2 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 0.1 Operating temperature range (°C) 0 to 70 Specified voltage (±V) 5 Rating Catalog
VQFN (RGV) 16 16 mm² 4 x 4
  • ADVANTAGES:
    • - Tiny for High Density Systems
    • - Precision on One Supply
    • - Fast Over Eight Decades
    • - Fully-Tested Function
  • TWO SCALING AMPLIFIERS
  • WIDE INPUT DYNAMIC RANGE: Eight Decades, 100pA to 10mA
  • 2.5V REFERENCE
  • STABILE OVER TEMPERATURE
  • LOW QUIESCENT CURRENT: 10mA
  • DUAL OR SINGLE SUPPLY: ±5V, +5V
  • PACKAGE: Small QFN-16 (4mm x 4mm)
  • SPECIFIED TEMPERATURE RANGE: –5°C to +75°C
  • APPLICATIONS
    • ONET ERBIUM-DOPED FIBER OPTIC AMPLIFIER (EDFA)
    • LASER OPTICAL DENSITY MEASUREMENT
    • PHOTODIODE SIGNAL COMPRESSION AMP
    • LOG, LOG-RATIO FUNCTION
    • ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (ADC) CONVERTER
    • ABSORBANCE MEASUREMENT
  • ADVANTAGES:
    • - Tiny for High Density Systems
    • - Precision on One Supply
    • - Fast Over Eight Decades
    • - Fully-Tested Function
  • TWO SCALING AMPLIFIERS
  • WIDE INPUT DYNAMIC RANGE: Eight Decades, 100pA to 10mA
  • 2.5V REFERENCE
  • STABILE OVER TEMPERATURE
  • LOW QUIESCENT CURRENT: 10mA
  • DUAL OR SINGLE SUPPLY: ±5V, +5V
  • PACKAGE: Small QFN-16 (4mm x 4mm)
  • SPECIFIED TEMPERATURE RANGE: –5°C to +75°C
  • APPLICATIONS
    • ONET ERBIUM-DOPED FIBER OPTIC AMPLIFIER (EDFA)
    • LASER OPTICAL DENSITY MEASUREMENT
    • PHOTODIODE SIGNAL COMPRESSION AMP
    • LOG, LOG-RATIO FUNCTION
    • ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (ADC) CONVERTER
    • ABSORBANCE MEASUREMENT

The LOG114 is specifically designed for measuring low-level and wide dynamic range currents in communications, lasers, medical, and industrial systems. The device computes the logarithm or log-ratio of an input current or voltage relative to a reference current or voltage (logarithmic transimpedance amplifier).

High precision is ensured over a wide dynamic range of input signals on either bipolar (±5V) or single (+5V) supply. Special temperature drift compensation circuitry is included on-chip. In log-ratio applications, the signal current may be from a high impedance source such as a photodiode or resistor in series with a low impedance voltage source. The reference current is provided by a resistor in series with a precision internal voltage reference, photo diode, or active current source.

The output signal at VLOGOUT has a scale factor of 0.375V out per decade of input current, which limits the output so that it fits within a 5V or 10V range. The output can be scaled and offset with one of the available additional amplifiers, so it matches a wide variety of ADC input ranges. Stable dc performance allows accurate measurement of low-level signals over a wide temperature range. The LOG114 is specified over a -5°C to +75°C temperature range and can operate from -40°C to +85°C.

The LOG114 is specifically designed for measuring low-level and wide dynamic range currents in communications, lasers, medical, and industrial systems. The device computes the logarithm or log-ratio of an input current or voltage relative to a reference current or voltage (logarithmic transimpedance amplifier).

High precision is ensured over a wide dynamic range of input signals on either bipolar (±5V) or single (+5V) supply. Special temperature drift compensation circuitry is included on-chip. In log-ratio applications, the signal current may be from a high impedance source such as a photodiode or resistor in series with a low impedance voltage source. The reference current is provided by a resistor in series with a precision internal voltage reference, photo diode, or active current source.

The output signal at VLOGOUT has a scale factor of 0.375V out per decade of input current, which limits the output so that it fits within a 5V or 10V range. The output can be scaled and offset with one of the available additional amplifiers, so it matches a wide variety of ADC input ranges. Stable dc performance allows accurate measurement of low-level signals over a wide temperature range. The LOG114 is specified over a -5°C to +75°C temperature range and can operate from -40°C to +85°C.
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类型 标题 下载最新的英语版本 日期
* 数据表 Single-Supply, High-Speed, Precision Logarithmic Amplifier 数据表 (Rev. A) 2007年 3月 19日
EVM 用户指南 LOG114EVM User Guide 2011年 9月 29日

设计和开发

如需其他信息或资源，请点击以下任一标题进入详情页面查看（如有）。

评估板

LOG114EVM — LOG114 评估模块

LOG114EVM 是一个随时可用的平台，用于评估 LOG114 在各种配置下的性能。LOG114EVM 配置为使用 5V 单电源运行。LOG114EVM 中使用的电路旨在于宽输入电流（10nA 至 10mA）范围内运行，并可将输出电压从 1.15V 调节至 2.75V。其他电路包括精密电平转换器和高电流线性校正部分。

用户指南: PDF
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仿真模型

LOG114 PSpice Model (Rev. C)

SBOM383C.ZIP (53 KB) - PSpice Model
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仿真模型

LOG114 TINA-TI Reference Design (Rev. C)

SBOM384C.TSC (101 KB) - TINA-TI Reference Design
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仿真模型

LOG114 TINA-TI Spice Model (Rev. C)

SBOM385C.ZIP (5 KB) - TINA-TI Spice Model
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模拟工具

PSPICE-FOR-TI — 适用于 TI 设计和模拟工具的 PSpice®

PSpice® for TI 可提供帮助评估模拟电路功能的设计和仿真环境。此功能齐全的设计和仿真套件使用 Cadence® 的模拟分析引擎。PSpice for TI 可免费使用，包括业内超大的模型库之一，涵盖我们的模拟和电源产品系列以及精选的模拟行为模型。

借助 PSpice for TI 的设计和仿真环境及其内置的模型库，您可对复杂的混合信号设计进行仿真。创建完整的终端设备设计和原型解决方案，然后再进行布局和制造，可缩短产品上市时间并降低开发成本。

在 PSpice for TI 设计和仿真工具中，您可以搜索 TI (...)
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模拟工具

TINA-TI — 基于 SPICE 的模拟仿真程序

TINA-TI 提供了 SPICE 所有的传统直流、瞬态和频域分析以及更多。TINA 具有广泛的后处理功能，允许您按照希望的方式设置结果的格式。虚拟仪器允许您选择输入波形、探针电路节点电压和波形。TINA 的原理图捕获非常直观 - 真正的“快速入门”。

TINA-TI 安装需要大约 500MB。直接安装，如果想卸载也很容易。我们相信您肯定会爱不释手。

TINA 是德州仪器 (TI) 专有的 DesignSoft 产品。该免费版本具有完整的功能，但不支持完整版 TINA 所提供的某些其他功能。

如需获取可用 TINA-TI 模型的完整列表，请参阅：SpiceRack - 完整列表 

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用户指南: PDF
英语版 (Rev.A): PDF
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VQFN (RGV) 16 查看选项
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订购和质量

包含信息：
  • RoHS
  • REACH
  • 器件标识
  • 引脚镀层/焊球材料
  • MSL 等级/回流焊峰值温度
  • MTBF/时基故障估算
  • 材料成分
  • 鉴定摘要
  • 持续可靠性监测
包含信息：
  • 制造厂地点
  • 封装厂地点

支持和培训

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