AD715x Series Capacitance-to-Digital Converters

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            AD715x Series Capacitance-to-Digital Converters
                    Analog Devices' 12-bit sigma-delta (Σ-Δ) capacitance-to-digital converters (CSCs)
    

Image of Analog Devices' AD7150BRMZ: Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing ADI's AD7150 delivers a complete signal processing solution for capacitive proximity sensors, featuring an ultra-low power converter with fast response time. The AD7151 is a single-channel, lower power alternative to the AD7150. The AD7150 is a 2-channel alternative to the AD7151.

The AD7152/AD7153 are 12-bit sigma-delta (Σ-Δ) capacitance-to-digital 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 ppF 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.

AD7150 Key Features

Ultra-low power 2.7 V to 3.6 V, 100 µA
Response time: 10 ms
Adaptive environmental compensation and EMC tested
2 independent capacitance input channels Sensor capacitance (C_SENS) 0 pF up to 13 pF Sensitivity to 1 fF
2 modes of operation Standalone with fixed settings Interfaced to a microcontroller for user-defined settings
2 proximity detection output flags
2-wire serial interface (I²C compatible)
Operating temperature -40°C to +85°C
10-lead MSOP package

AD7151 Key Features

Ultra-low power 2.7 V to 3.6 V, 70 µA
Response time: 10 ms
Adaptive environmental compensation
1 capacitance input channel sensor capacitance (C_SENS) 0 up to 13 pF sensitivity to 1 fF
EMC tested
Two modes of operation standalone with fixed settings Interfaced to a microcontroller for user-defined settings
Proximity detection output flag
2-wire serial interface (I²C-compatible)
Operating temperature -40°C to +85°C
10-lead MSOP package