Hi All,
Thanks for your times, I have a question when i learnt this documents, i noted 4.3 Selection of Op-Amps, how to understand each of items? especially for item 1. Thank you.
REQUIREMENT, BENEFIT
1. High input impedance, Minimizing this reduces input loading on sensor and minimizes input current offsets on High input impedance input resistors.
2. Input current noise, Minimizing this reduces the amount of current noise that becomes converted to voltage Input current noise noise on input resistors. Voltage noise
3. Voltage noise, Minimizing this improves the overall signal-to-noise ratio. Maximizing this reduces the amount of input offset changes due to high dv/dt at the CMRR versus frequency inverter output.
4. CMRR versus frequency, Minimizing this reduces the amount that the total unadjusted error changes at the output Voltage offset drift of the op-amp.
5. Voltage offset drift, Designing a single-supply amplifier simplifies the system supply requirements; this Single supply or dual supply operation usually correlates with lower power architecture. However, if the signal coming from sensor itself is bipolar, it is good to use op-amp with dual supply options.
6. Input type, Rail-to-rail input can help to interface sensors having large input swings.
7. Output type, With rail-to-rail output configuration, the amplified input signal can reach the supply Output type voltage and can use the FS range of ADC in a better way