LOG101 Texas instruments

LOG101

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LOG101

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Описание

The LOG101 is a versatile integrated circuit that computes the logarithm or log ratio of an input current relative to a reference current. The LOG101 is tested over a wide dynamic range of input signals. In log ratio applications, a signal current can come from a photodiode, and a reference current from a resistor in series with a precision external reference. The output signal at VOUT is trimmed to 1V per decade of input current allowing seven decades of input current dynamic range. Low DC offset voltage and temperature drift allow accurate measurement of low-level signals over a wide environmental temperature range. The LOG101 is specified over the temperature range 5°C to +75°C, with operation over 40°C to +85°C.

EASY-TO-USE COMPLETE CORE FUNCTION
HIGH ACCURACY: 0.01% FSO Over 5 Decades
WIDE INPUT DYNAMIC RANGE:
7.5 Decades, 100pA to 3.5mA
LOW QUIESCENT CURRENT: 1mA
WIDE SUPPLY RANGE: ±4.5V to ±18V
APPLICATIONS
- LOG, LOG RATIO, ANTI-LOG COMPUTATION:
  Communication, Analytical, Medical, Industrial, Test, and General Instrumentation
- PHOTODIODE SIGNAL COMPRESSION AMPS
- ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D)CONVERTERS

Note: Protected under US Patent #6,667,650; other patents pending.

Scale factor (V/decade)	1
Input current range (min) (nA)	100
Input current range (max) (mA)	3.5
Offset voltage (input amplifiers) (max) (mV)	1.5
Vs (±) (min) (V)	4.5
Vs (±) (max) (V)	18
Iq (max) (mA)	1.5
Dynamic range (typ) (dB)	150
Reference type	External
Auxiliary op amps	0
Full-scale output voltage (min) (±V)	1.2
Full-scale output voltage (max) (±V)	1.5
Conformity error (initial 5 decades) (max) (%)	0.2
Conformity error (initial 5 decades) (typ. over temp) (%/°C)	0.0001
Operating temperature range (°C)	-40 to 85
Specified voltage (±V)	5
Rating	Catalog