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www.ti.com ELECTRICAL CHARACTERISTICS SBOS381A – FEBRUARY 2007 – REVISED APRIL 2007 Boldface limits apply over the specified temperature range: T A = –40°C to +125°C. At T A = +25°C, VS = +5V, VCM = +12V, VSENSE = 100mV, and PRE OUT connected to BUF IN, unless otherwise noted. INA270, INA271 PARAMETER CONDITIONS MIN TYP MAX UNIT INPUT Full-Scale Input Voltage VSENSE VSENSE = (VIN+) + (VIN–) 0.15 (VS – 0.2)/Gain V Common-Mode Input Range VCM –16 +80 V Common-Mode Rejection Ratio CMRR VIN+ = –16V to +80V 80 120 dB Over Temperature VIN+ = +12V to +80V 100 120 dB Offset Voltage, RTI(1) VOS ±0.5 2.5 mV Over Temperature ±3 mV vs Temperature dVOS/dT 2.5 20 µV/°C vs Power-Supply PSR VS = +2.7V to +18V, VCM = +18V 5 100 µV/V Input Bias Current, VIN– Pin IB ±8 ±16 µA PRE OUT Output Impedance(2) 96 k Ω Buffer Input Bias Current –50 nA Buffer Input Bias Current Temperature ±0.03 nA/ °C Coefficient OUTPUT (VSENSE ≥ 20mV)(3) Gain: INA270 Total Gain G 14 V/V Gain: INA271 Total Gain G 20 V/V Output Buffer Gain GBUF 2 V/V Total Gain Error VSENSE = 20mV to 100mV ±0.2 ±1 % Over Temperature ±2 % vs Temperature 50 ppm/ °C Total Output Error(4) VSENSE = 20mV to 100mV ±0.75 ±2.2 % Total Output Error ±1.0 ±3.0 % Nonlinearity Error VSENSE = 20mV to 100mV ±0.002 % Output Impedance, Pin 5 RO 1.5 Ω Maximum Capacitive Load No Sustained Oscillation 10 nF VOLTAGE OUTPUT(5) RL = 10kΩ to GND Swing to V+ Power-Supply Rail (V+) – 0.05 (V+) – 0.2 V Swing to GND(6) VGND + 0.003 VGND + 0.05 V FREQUENCY RESPONSE Bandwidth BW CLOAD = 5pF 130 kHz Phase Margin CLOAD < 10nF 40 degrees Slew Rate SR 1 V/ µs Settling Time (1%) tS VSENSE = 10mV to 100mVPP, 2 µs CLOAD = 5pF (1) RTI means Referred-to-Input. (2) Initial resistor variation is ±30% with an additional –2200ppm/°C temperature coefficient. (3) For output behavior when VSENSE < 20mV, see the Application Information section Accuracy Variations as A Result of VSENSE and Common-Mode Voltage. (4) Total output error includes effects of gain error and VOS. (5) See typical characteristic curve Output Swing vs Output Current and Application Information section Accuracy Variations as A Result of VSENSE and Common-Mode Voltage. (6) Ensured by design; not production tested. 3 |
