Home Amplifiers Special function amplifiers Logarithmic amplifiers
Home
Amplifiers
Special function amplifiers
Logarithmic amplifiers

LOG200

ACTIVE

High-speed precision logarithmic amplifier with photodiode bias and dark-current correction

Order now
Data sheet

LOG200

ACTIVE
Data sheet Order now

Product details

Input current range (min) (nA) 0.1 Input current range (max) (mA) 10 Offset voltage (input amplifiers) (max) (mV) 2 Vs (±) (min) (V) 4.5 Vs (±) (max) (V) 12.6 Iq (max) (mA) 9 Dynamic range (typ) (dB) 160 Reference type Int Auxiliary op amps 1 Full-scale output voltage (min) (±V) 4.8 Full-scale output voltage (max) (±V) 12.3 Conformity error (initial 5 decades) (max) (%) 1.5 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 0.2 Operating temperature range (°C) -40 to 125 Rating Catalog
Input current range (min) (nA) 0.1 Input current range (max) (mA) 10 Offset voltage (input amplifiers) (max) (mV) 2 Vs (±) (min) (V) 4.5 Vs (±) (max) (V) 12.6 Iq (max) (mA) 9 Dynamic range (typ) (dB) 160 Reference type Int Auxiliary op amps 1 Full-scale output voltage (min) (±V) 4.8 Full-scale output voltage (max) (±V) 12.3 Conformity error (initial 5 decades) (max) (%) 1.5 Conformity error (initial 5 decades) (typ. over temp) (%/°C) 0.2 Operating temperature range (°C) -40 to 125 Rating Catalog
VQFN (RGT) 16 9 mm² (3 mm × 3 mm)
  • Ultra-fast transient response to low current levels:
    • Settling time for 10nA to 100nA step: 240ns rising, 620ns falling (typ)
    • Settling time for 100nA to 1µA step: 60ns rising, 150ns falling (typ)
  • Wide dynamic range: 10pA to 10mA (180dB)
    • Specified from 100pA to 10mA (160dB)
  • High signal bandwidth:
    • 20MHz at 10µA to 10mA
    • 6.3MHz at 1µA
    • 90kHz at 1nA
  • High-accuracy transfer function:
    • 0.2% max log conformity error (10nA to 100µA)
  • Integrated reference current (1µA) and reference voltages (2.5V and 1.65V)
  • Additional auxiliary high-speed op amp for differential ADC drive, single-ended gain or filter blocks, and other peripheral functions
  • Single supply (4.5V to 12.6V) or dual supply (±2.25V to ±6.3V) operation
  • Specified temperature range: –40°C to +125°C
  • Small package options:
    • 3mm × 3mm VQFN
    • 1.6mm × 1.6mm DSBGA
  • Ultra-fast transient response to low current levels:
    • Settling time for 10nA to 100nA step: 240ns rising, 620ns falling (typ)
    • Settling time for 100nA to 1µA step: 60ns rising, 150ns falling (typ)
  • Wide dynamic range: 10pA to 10mA (180dB)
    • Specified from 100pA to 10mA (160dB)
  • High signal bandwidth:
    • 20MHz at 10µA to 10mA
    • 6.3MHz at 1µA
    • 90kHz at 1nA
  • High-accuracy transfer function:
    • 0.2% max log conformity error (10nA to 100µA)
  • Integrated reference current (1µA) and reference voltages (2.5V and 1.65V)
  • Additional auxiliary high-speed op amp for differential ADC drive, single-ended gain or filter blocks, and other peripheral functions
  • Single supply (4.5V to 12.6V) or dual supply (±2.25V to ±6.3V) operation
  • Specified temperature range: –40°C to +125°C
  • Small package options:
    • 3mm × 3mm VQFN
    • 1.6mm × 1.6mm DSBGA

The LOG200 is a wide-dynamic-range current-to-voltage amplifier specifically designed to optimize current measurements across 160dB of dynamic range with unparalleled accuracy and speed for optical communications, medical diagnostics, and industrial process-control measurements. The LOG200 features two logarithmic amplifiers followed by a high-accuracy differential amplifier that convert current signals into a voltage representing the log-compressed ratio of the two currents. The current inputs are designed to feature a high-speed response from one input, and a highly accurate reference signal on the other input, allowing for a unique combination of fast transient response and high logarithmic conformity.

The LOG200 ratio is internally set to 250mV/decade of current-to-voltage conversion. The device integrates an uncommitted high-speed amplifier to allow the output to be configured for differential or filtered responses, with a fast settling time to drive successive approximation analog-to-digital converters (SAR ADCs). The LOG200 also features a separate reference current and reference voltage designed to configure the device for optimized input current and common-mode voltages.

The LOG200 can be powered in a single-supply (4.5V to 12.6V) or dual-supply (±2.25V to ±6.3V) configuration and is specified from –40°C to +125°C.

The LOG200 is a wide-dynamic-range current-to-voltage amplifier specifically designed to optimize current measurements across 160dB of dynamic range with unparalleled accuracy and speed for optical communications, medical diagnostics, and industrial process-control measurements. The LOG200 features two logarithmic amplifiers followed by a high-accuracy differential amplifier that convert current signals into a voltage representing the log-compressed ratio of the two currents. The current inputs are designed to feature a high-speed response from one input, and a highly accurate reference signal on the other input, allowing for a unique combination of fast transient response and high logarithmic conformity.

The LOG200 ratio is internally set to 250mV/decade of current-to-voltage conversion. The device integrates an uncommitted high-speed amplifier to allow the output to be configured for differential or filtered responses, with a fast settling time to drive successive approximation analog-to-digital converters (SAR ADCs). The LOG200 also features a separate reference current and reference voltage designed to configure the device for optimized input current and common-mode voltages.

The LOG200 can be powered in a single-supply (4.5V to 12.6V) or dual-supply (±2.25V to ±6.3V) configuration and is specified from –40°C to +125°C.
filter Find other Logarithmic amplifiers
Download View video with transcript Video

Technical documentation

No results found. Please clear your search and try again.
View all 3
Top documentation Type Title Format options Date
* Data sheet LOG200 Precision, High-Speed Logarithmic Amplifier With Integrated Photodiode Bias datasheet (Rev. B) PDF | HTML Aug 6, 2026
Application note Perform Accurate Optical Current Sense Measurements Using the LOG200 Logarithmic Amplifier PDF | HTML Jan 21, 2025
Certificate LOG200EVM EU Declaration of Conformity (DoC) Jun 30, 2023

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LOG200EVM — LOG200 evaluation module

The LOG200 evaluation module (EVM) is a development platform for evaluating the LOG200, which is a precision, high-speed logarithmic amplifier with integrated photodiode bias and dark-current correction. LOG200 is optimized for current measurements across 160 dB of dynamic range with unparalleled (...)

User guide: PDF | HTML
Supported products & hardware
In stock
Limit:
??asset.out-of-stock-ti_en_US??
Not available
Simulation model

LOG200 PSpice Model

SBOMCF1.ZIP (97 KB) - PSpice model
Supported products & hardware
Simulation model

LOG200 TINA-TI Reference Design

SBOMCF2 (93 KB) - TINA-TI reference design
Supported products & hardware
Simulation model

LOG200 TINA-TI SPICE Model

SBOMCF0.ZIP (38 KB) - TINA-TI Spice model
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
VQFN (RGT) 16 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos