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LOG112AID Datasheet(PDF) 3 Page - Texas Instruments |
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LOG112AID Datasheet(HTML) 3 Page - Texas Instruments |
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3 / 20 page  LOG112, 2112 3 SBOS246D www.ti.com ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TA = –5°C to +75°C. At TA = +25°C, VS = ±5V, and ROUT = 10kΩ, unless otherwise noted. LOG112, LOG2112 PARAMETER CONDITION MIN TYP MAX UNITS CORE LOG FUNCTION VIN /VOUT Equation VLOGOUT = (0.5V)LOG (I1/I2)V LOG CONFORMITY ERROR(1) Initial 1nA to 100 µA (5 decades) 0.01 0.2 % 100pA to 3.5mA (7.5 decades) 0.13 % over Temperature 1nA to 100 µA (5 decades) 0.0001 %/ °C 100pA to 3.5mA (7.5 decades) 0.005 %/ °C GAIN(2) Initial Value 1nA to 100 µA 0.5 V/decade Gain Error 1nA to 100 µA 0.10 ±1% vs Temperature TMIN to TMAX 0.003 0.01 %/ °C INPUT, A1A and A1B, A2A, A2B Offset Voltage ±0.3 ±1.5 mV vs Temperature TMIN to TMAX ±2 µV/ °C vs Power Supply (PSRR) VS = ±4.5V to ±18V 5 20 µV/V Input Bias Current ±5pA vs Temperature TMIN to TMAX Doubles Every 10 °C Voltage Noise f = 10Hz to 10kHz 3 µVrms f = 1kHz 30 nV/ √Hz Current Noise f = 1kHz 4 fA/ √Hz Common-Mode Voltage Range (Positive) (V+) – 2 (V+) – 1.5 V (Negative) (V–) + 2 (V–) + 1.2 V Common-Mode Rejection Ratio (CMRR) 10 µV/V OUTPUT, (VLOG OUT) A2A, A2B Output Offset, VOSO, Initial ±3 ±15 mV vs Temperature TMIN to TMAX ±10 µV/°C Full-Scale Output (FSO) VS = ±5V (V–) + 1.2 (V+) – 1.5 V Short-Circuit Current ±18 mA TOTAL ERROR(3)(4) I1 or I2 remains fixed while other varies. Initial Min to Max I1 or I2 = 5mA (VS ≥ ±6V) ±150 mV I1 or I2 = 3.5mA ±75 mV I1 or I2 = 1mA ±20 mV I1 or I2 = 100µA ±20 mV I1 or I2 = 10µA ±20 mV I1 or I2 = 1µA ±20 mV I1 or I2 = 100nA ±20 mV I1 or I2 = 10nA ±20 mV I1 or I2 = 1nA ±20 mV I1 or I2 = 350pA ±20 mV I1 or I2 = 100pA ±20 mV vs Temperature I1 or I2 = 3.5mA ±1.2 mV/ °C I1 or I2 = 1mA ±0.4 mV/ °C I1 or I2 = 100µA ±0.1 mV/ °C I1 or I2 = 10µA ±0.05 mV/ °C I1 or I2 = 1µA ±0.05 mV/ °C I1 or I2 = 100nA ±0.09 mV/ °C I1 or I2 = 10nA ±0.2 mV/ °C I1 or I2 = 1nA ±0.3 mV/ °C I1 or I2 = 350pA ±0.1 mV/ °C I1 or I2 = 100pA ±0.3 mV/ °C vs Supply I1 or I2 = 3.5mA ±3.0 mV/ V I1 or I2 = 1mA ±0.1 mV/ V I1 or I2 = 100µA ±0.1 mV/ V I1 or I2 = 10µA ±0.1 mV/ V I1 or I2 = 1µA ±0.1 mV/ V I1 or I2 = 100nA ±0.1 mV/ V I1 or I2 = 10nA ±0.1 mV/ V I1 or I2 = 1nA ±0.25 mV/V I1 or I2 = 350pA ±0.1 mV/ V I1 or I2 = 100pA ±0.1 mV/ V NOTES: (1) Log Conformity Error is the peak deviation from the best-fit-straight line of VO versus LOG (I1/I2) curve expressed as a percent of peak-to-peak full- scale output. K, scale factor, equals 0.5V output per decade of input current. (2) Scale factor of core log function is trimmed to 0.5V output per decade change of input current. (3) Worst-case Total Error for any ratio of I1/I2, as the largest of the two errors, when I1 and I2 are considered separately. (4) Total Error includes offset voltage, bias current, gain, and log conformity. (5) Bandwidth (3dB) and transient response are a function of both the compensation capacitor and the level of input current. |
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