The LM2904VQDRQ1: With a gain-bandwidth product of 700 kHz and a slew rate of 0.3 V/µs, this op amp handles sensor signal conditioning and actuator drive loops in automotive body electronics, powertrain control, and chassis systems where the signal bandwidth stays below 100 kHz.
Each amplifier draws 500 µA of supply current (1 mA total for both channels). At 12 V supply, the quiescent power dissipation is 12 mW — low enough that the 8-SOIC package dissipates the heat without thermal derating in still air up to 125°C ambient. The 30 mA per-channel output current drives typical automotive loads: a 5 V reference into a 10 kΩ ADC input (0.5 mA), a relay coil with a 200 Ω DC resistance (60 mA peak), or a piezo buzzer rated at 20 mA continuous.
Input offset and bias: 3 mV offset, 20 nA bias — what they mean for precision sensing
The 3 mV maximum input offset voltage (Vos) is the error floor for DC-accurate measurements. In a non-inverting gain-of-10 stage, this translates to 30 mV of output offset — acceptable for a 0-5 V throttle position sensor (1.2% of full scale) but marginal for a 0-100 mV shunt current monitor (30% error). The 20 nA input bias current (Iib) flows into the summing node and creates a voltage error across the feedback resistors. With 10 kΩ source impedance, the error is 200 µV — negligible compared to the 3 mV offset. But with 1 MΩ source impedance (piezo or high-impedance thermistor), the 20 nA bias generates 20 mV of additional offset, dominating the error budget.
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