Another concern is often the impedance network at the sampling circuit, since it is desirable to not have the ADC sampling network affect the sensor. Where the sensor has a high impedance output, it is desirable to have a buffer either integrated with the ADC or external to allow the sensor to see a high impedance connection and the ADC to see a low impedance. The MAX11200 family achieves this with internal buffers on the analog inputs and the reference inputs. A frequent concern is the impedance network at the sampling circuit, since it is desirable to not have the ADC sampling network affect the sensor.