LOG114AIRGVT ,Precision High-Speed Logarithmic Amplifier with 2.5V Reference and Uncommitted Output Op AmpsFEATURES DESCRIPTIONThe LOG114 is specifically designed for measuring ADVANTAGES:low-level and wid ..
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LOG114AIRGVR-LOG114AIRGVRG4-LOG114AIRGVT
Precision High-Speed Logarithmic Amplifier with 2.5V Reference and Uncommitted Output Op Amps
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
DESCRIPTIONThe 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
LOG114SBOS301A − MAY 2004 − REVISED MARCH 2007
Single-Supply , High-Speed, Precision
LOGARITHMIC AMPLIFIER
