AD7152

12位电容至数字转换器 12-Bit Capacitance-to-Digital Converter

Product Details

The /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 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, I2C-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.

Applications

Automotive, industrial, and medical systems for

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Pressure measurement

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Position sensing

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Level sensing

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Flowmeters

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Humidity sensing

### Features and Benefits

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Capacitance-to-digital converters

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Interfaces to floating sensors

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Resolution down to 0.25 fF that is, up to 12 ENOB

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Linearity: 0.05%

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Common-mode not changing capacitance up to 5 pF

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Four capacitance ranges selectable per operation mode

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Tolerant of parasitic capacitance to ground up to 50 pF

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Conversion time per channel: 5 ms, 20 ms, 50 ms, and 60 ms

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Internal clock oscillator

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2-wire serial interface

I2C-compatible

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Power

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2.7 V to 3.6 V single-supply operation

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100 μA current consumption

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Operating temperature: −40°C to +85°C

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10-lead MSOP

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See data sheet for additional features