The LOG112 and LOG2112 are versatile integrated circuits that compute the logarithm or log ratio of an input current relative to a reference current. VLOGOUT of the LOG112 and LOG2112 are trimmed to 0.5V per decade of input current, ensuring high precision over a wide dynamic range of input signals.
The LOG112 and LOG2112 features a 2.5V voltage reference that may be used to generate a precision current reference using an external resistor.
Low DC offset voltage and temperature drift allow accurate measurement of low-level signals over the specified temperature range of –5°C to +75°C.
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| Scale factor (V/decade) | 0.5 |
| Input current range (min) (nA) | 1 |
| 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) | 1.75 |
| Dynamic range (typ) (dB) | 150 |
| Reference type | Internal |
| Auxiliary op amps | 1 |
| Full-scale output voltage (min) (±V) | -3.8 |
| Full-scale output voltage (max) (±V) | 3.5 |
| 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 |
| SOIC (D) | 14 | 51.9 mm² 8.65 x 6 |
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