The AD7152/AD7153 are 12-bit sigma-delta （Σ-Δ） capacitance-todigital converters （CDCs）。 The capacitance to be measured is connected directly to the device inputs. The architecture features inherent high resolution （12-bit no missing codes， up to 12-bit effective resolution） and high linearity （±0.05%）。 The AD7152/ AD7153 have four capacitance input ranges per operation mode， ±0.25 pF to ±2 pF in differential mode and 0.5 pF to 4 pF in single-ended mode. The AD7152/AD7153 can accept up to 5 pF common-mode capacitance （not changing）， which can be balanced by a programmable on-chip， digital-to-capacitance converter （CAPDAC）。 The AD7153 has one capacitance input channel， while the AD7152 has two channels. Each channel can be configured as single-ended or differential. The AD7152/AD7153 are designed for floating capacitive sensors. The AD7152/AD7153 have a 2-wire， I2 C-compatible serial interface. Both devices can operate with a single power supply from 2.7 V to 3.6 V. They are specified over the temperature range of ?40°C to +85°C and are available in a 10-lead MSOP.