| Scale factor (V/decade) | 0.5 |
| Input current range (Min) (nA) | 100 |
| Input current range (Max) (mA) | 3.5 |
| Conformity error (initial 5 decades) (Max) (%) | 0.2 |
| Conformity error (initial 5 decades) (typ. over temp) (%/degree C) | 0.0001 |
| 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 |
| Operating temperature range (C) | -40 to 85 |
| Specified voltage (+/- V) | 5 |
- 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, General Instrumentation - PHOTODIODE SIGNAL COMPRESSION AMP
- ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL(A/D)CONVERTER
- LOG, LOG RATIO, ANTI-LOG COMPUTATION:
Note: Protected under US Patent #6,667,650; other patents pending.
All trademarks are the property of their respective owners.
The LOG104 is a versatile integrated circuit that computes the logarithm or log ratio of an input current relative to a reference current.
The LOG104 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 0.5V 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 LOG104 is specified over the temperature range ?5°C to +75°C, with operation over ?40°C to +85°C.
