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Amplificadores logarítmicos

LOG114

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

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LOG114

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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 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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Documentación técnica

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* Data sheet Single-Supply, High-Speed, Precision Logarithmic Amplifier datasheet (Rev. A) 19 mar 2007
EVM User's guide LOG114EVM User Guide 29 sep 2011

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) - PSpice Model
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Modelo de simulación

LOG114 TINA-TI Reference Design (Rev. C)

SBOM384C.TSC (101 KB) - TINA-TI Reference Design
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Modelo de simulación

LOG114 TINA-TI Spice Model (Rev. C)

SBOM385C.ZIP (5 KB) - TINA-TI Spice Model
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Herramienta de simulación

PSPICE-FOR-TI — PSpice® para herramienta de diseño y simulación de TI

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Herramienta de simulación

TINA-TI — Programa de simulación analógica basado en SPICE

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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Encapsulado Pines Símbolos CAD, huellas y modelos 3D
VQFN (RGV) 16 Ultra Librarian
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Pedidos y calidad

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  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
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  • Resumen de calificaciones
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