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LTC2460-Slide2

This schematic represents a typical signal chain for an analog sensor. The signal begins with the sensor, followed by an amplifier to provide a small amount of gain, and a low resolution ADC. This circuit can often be designed with low cost ICs, but there will be errors in the signal chain that reduce the effective number of bits. This includes the offset error from the amplifier and the error from the resistors needed to set the gain. Another factor to consider is the amplifier’s headroom, which limits the output swing to the amplifier’s rail voltages.

PTM Published on: 2011-05-13