LOG114AIRGVR Datasheet PDF - Burr Brown

●DESCRIPTION

●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.

●FEATURES

● 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 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