Texas InstrumentsUnited States
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 V OUT 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.
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View full reportTechnical parameters
| Power | |
|---|---|
| Full-scale output voltage (max) (±V) | 1.5 |
| Full-scale output voltage (min) (±V) | 1.2 |
| Input current range (max) (mA) | 3.5 |
| Input current range (min) (nA) | 100 |
| Specified voltage (±V) | 5 |
| AC and DC characteristics | |
| Offset voltage (input amplifiers) (max) (mV) | 1.5 |
| Environment and package | |
| Conformity error (initial 5 decades) (typ. over temp) (%/°C) | 0.0001 |
| Operating temperature range (°C) | -40 to 85 |
| Other | |
| Auxiliary op amps | 0 |
| Conformity error (initial 5 decades) (max) (%) | 0.2 |
| Dynamic range (typ) (dB) | 150 |
| Iq (max) (mA) | 1.5 |
| Rating | Catalog |
| Reference type | External |
| Scale factor (V/decade) | 1 |
| Vs (±) (max) (V) | 18 |
| Vs (±) (min) (V) | 4.5 |