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LOG114

ACTIVO

Amplificador logarítmico de precisión de alta velocidad con referencia de 2,5 V y amplificadores ope

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Detalles del producto

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 mm × 4 mm)
  • 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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Documentación técnica

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Documentación principal Tipo Título Opciones de formato Descargar la versión más reciente en inglés Fecha
* Hoja de datos LOG114 Single-Supply, High-Speed, Precision Logarithmic Amplifier datasheet (Rev. C) PDF | HTML 10/12/2025

Diseño y desarrollo

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Placa de evaluación

LOG114EVM — Módulo de evaluación LOG114

El LOG114EVM es una plataforma lista para usar para evaluar el rendimiento del LOG114 en varias configuraciones. El LOG114EVM viene configurado para funcionar con una única fuente de alimentación de 5 V. El circuito utilizado en el LOG114EVM está diseñado para (...)

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Modelo de simulación

LOG114 PSpice Model (Rev. C)

SBOM383C.ZIP (53 KB) - Modelo PSpice
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Modelo de simulación

LOG114 TINA-TI Reference Design (Rev. C)

SBOM384C.TSC (101 KB) - Diseño de referencia TINA-TI
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Modelo de simulación

LOG114 TINA-TI Spice Model (Rev. C)

SBOM385C.ZIP (5 KB) - Modelo TINA-TI Spice
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