AD7152/AD7153 is a 12-bit capacitance-to-digital converter that interfaces to floating sensors. It has a resolution down to 0.25 fF (that is, up to 12 ENOB) and a linearity of 0.05%. It supports four capacitance ranges that can be selected for different operation modes, including ±0.25 pF to ±2 pF in differential mode and 0.5 pF to 4 pF in single-ended mode.
The AD7152 (dual‑channel) and AD7153 (single‑channel) are 12‑bit sigma‑delta capacitance‑to‑digital converters designed for floating capacitive sensors. They operate from a single 2.7 V to 3.6 V supply, consume about 100 µA, and work over –40 °C to +85 °C. Four selectable input ranges per mode provide resolution down to 0.25 fF.
The devices feature a 2‑wire I²C‑compatible serial interface, internal CAPDAC for offset calibration, and extensive protection against parasitic capacitance and resistance. Typical applications include pressure, position, level, flow, and humidity sensing in automotive, industrial, and medical systems.
| Supply Voltage (VDD) | 2.7 V to 3.6 V |
|---|---|
| Operating Temperature | –40 °C to +85 °C |
| Capacitance Input Ranges (Differential) | ±0.25 pF to ±2 pF |
| Conversion Time per Channel | 5 ms, 20 ms, 50 ms, 60 ms |
| Current Consumption | 100 µA |
| Number of Channels | AD7152: 2 channels, AD7153: 1 channel |
The devices operate from 2.7 V to 3.6 V supply voltage.
They are specified for –40 °C to +85 °C operation.
Conversion time per channel can be 5 ms, 20 ms, 50 ms, or 60 ms depending on the selected mode.
The AD7153 has one input channel, while the AD7152 provides two channels.