To design with ISOTMP35, use the parameters listed in Table 8-4. Most CMOS-based ADCs have a sampled data comparator input structure. When the ADC charges the sampling capacitor, the capacitor requires instantaneous charge from the output of the analog temperature sensor, such as the ISOTMP35. Therefore, the output impedance of the temperature sensor can affect ADC performance. In most cases, adding an external capacitor mitigates design challenges. The ISOTMP35 is specified and characterized with a 1000-pF maximum capacitive load (C_LOAD). The C_LOAD is a sum of the C_FILTER, C_MUX and C_SAMPLE. TI recommends maximizing the C_FILTER value while allowing for the maximum specified ADC input capacitance (C_MUX + C_SAMPLE) to limit the total C_LOAD at 1000 pF. In most cases, a 680-pF C_FILTER provides a reasonable allowance for ADC input capacitance to minimize ADC sampling error and reduce noise coupling. An optional series resistor (R_FILTER) and C_FILTER provides additional low-pass filtering to reject system level noise. TI recommends placing R_FILTER and C_FILTER as close to the ADC input as possible for optimal performance.