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LOG200
  • LOG200
  • LOG200
  • LOG200

LOG200

ACTIVE

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

Texas Instruments LOG200 Product Info

1 April 2026 3

Parameters

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

Package

VQFN (RGT)-16-9 mm² 3 x 3

Features

  • 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 x 1.6mm DSBGA (Preview)
  • 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 x 1.6mm DSBGA (Preview)

Description

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.

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