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LOG114

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具有 2.5V 參考和未認可的輸出運算放大器的精密高速對數放大器

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產品規格表

現在提供此產品的更新版本

open-in-new 比較替代產品
功能相同，但引腳輸出與所比較的裝置不同
LOG200 現行 具有光二極體偏壓和暗電流修正的高速精密對數放大器 Upgraded performance with smaller package option

LOG114

現行
產品規格表 立即訂購

產品詳細資料

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
  • Stable over temperature
  • Low quiescent current: 10mA
  • Dual or single supply: ±5V, 5V
  • Package: Small QFN-16 (4mm × 4mm)
  • Specified temperature range: −5°C to 75°C
  • 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
  • Stable over temperature
  • Low quiescent current: 10mA
  • Dual or single supply: ±5V, 5V
  • Package: Small QFN-16 (4mm × 4mm)
  • Specified temperature range: −5°C to 75°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 verified 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 can 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/decade of input current, which limits the output so that the output fits within a 5V or 10V range. The output can be scaled and offset with one of the available additional amplifiers, so the output 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 verified 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 can 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/decade of input current, which limits the output so that the output fits within a 5V or 10V range. The output can be scaled and offset with one of the available additional amplifiers, so the output 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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類型 標題 日期
* Data sheet LOG114 Single-Supply, High-Speed, Precision Logarithmic Amplifier datasheet (Rev. C) PDF | HTML 2025年 12月 10日
EVM User's guide LOG114EVM User Guide 2011年 9月 29日

設計與開發

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開發板

LOG114EVM — LOG114 評估模組

LOG114EVM 是一個現成的平台，可用於評估各種配置中 LOG114 的性能。LOG114EVM 配置爲在單 5-V 電源上運作。LOG114EVM 中使用的電路，設計為在廣泛輸入電流 (10 nA 至 10 mA) 中運作，並可將輸出電壓從 1.15 V 調整至 2.75 V。其他電路包含精密位準移位器與高電流線性修正區段。

使用指南: PDF
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模擬型號

LOG114 PSpice Model (Rev. C)

SBOM383C.ZIP (53 KB) - PSpice Model
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模擬型號

LOG114 TINA-TI Reference Design (Rev. C)

SBOM384C.TSC (101 KB) - TINA-TI Reference Design
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模擬型號

LOG114 TINA-TI Spice Model (Rev. C)

SBOM385C.ZIP (5 KB) - TINA-TI Spice Model
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模擬工具

PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具

PSpice® for TI 是有助於評估類比電路功能的設計和模擬環境。這款全功能設計和模擬套件使用 Cadence® 的類比分析引擎。PSpice for TI 包括業界最大的模型庫之一，涵蓋我們的類比和電源產品組合，以及特定類比行為模型，且使用無需支付費用。

PSpice for TI 設計和模擬環境可讓您使用其內建函式庫來模擬複雜的混合訊號設計。在進行佈局和製造之前，建立完整的終端設備設計和解決方案原型，進而縮短上市時間並降低開發成本。 

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TINA-TI — 基於 SPICE 的類比模擬程式

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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VQFN (RGV) 16 Ultra Librarian
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