片上電壓參考為 2.5V 的精確對數(shù)和對數(shù)比放大器
| Scale factor (V/decade) | 0.5 |
| Input current range (Min) (nA) | 1 |
| 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) | 1.75 |
| 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 |
| Operating temperature range (C) | -40 to 85 |
| Specified voltage (+/- V) | 5 |
- EASY-TO-USE COMPLETE FUNCTION
- OUTPUT SCALING AMPLIFIER
- ON-CHIP 2.5V VOLTAGE REFERENCE
- HIGH ACCURACY: 0.2% FSO Over 5 Decades
- WIDE INPUT DYNAMIC RANGE:
???7.5 Decades, 100pA to 3.5mA - LOW QUIESCENT CURRENT: 1.75mA
- WIDE SUPPLY RANGE: ±4.5V to ±18V
- PACKAGES: SO-14 (narrow) and SO-16
- APPLICATIONS
- LOG, LOG RATIO:
???Communication, Analytical, Medical, Industrial, Test, General Instrumentation - PHOTODIODE SIGNAL COMPRESSION AMP
- ANALOG SIGNAL COMPRESSION IN FRONT OF ANALOG-TO-DIGITAL (A/D) CONVERTER
- ABSORBANCE MEASUREMENT
- OPTICAL DENSITY MEASUREMENT
- LOG, LOG RATIO:
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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.
