AD7152:  12-Bit Capacitance-to-Digital Converter (2 Capacitance Input Channels)

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 ...More

AD7152:  12-Bit Capacitance-to-Digital Converter (2 Capacitance Input Channels)

Product Description

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 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 parts 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 package.

Applications

  • Automotive, industrial, and medical systems for
    • Pressure measurement
    Position sensing
    Level sensing
    Flowmeters
    Humidity sensing

    Data Sheet, Rev. 0, 5/08

    Features

    Capacitance-to-digital converters

    • Interfaces to floating sensors
    • Resolution down to 0.25 fF (that is, up to 12 ENOB)
    • Linearity: 0.05%
    • Common-mode (not changing) capacitance up to 5 pF
    • Internal clock oscillator
    • 2-wire serial interface (I2C-compatible)
    • Power 2.7 V to 3.6 V single-supply operation 100 μA current consumption
    • See Data Sheet for Additional Information

    Diagrams

    AD7152 Diagram
    Functional Block Diagram for AD7152

    Explore Other Products

    AD7156 - Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter

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    Part# Resolution (Bits) T-Put Rate # Chan Supply V Pwr Diss (max) Input Base C (pF Max) Cin Range (pF) Pkg Type Price* (1000-4999) Product Description Interface
    AD7142 16 27.8SPS 14 Single(+2.6 to +3.6), Single(+2.7), Single(+3), Single(+3.3) 3.6mW 20 ±2 CSP $1.37 CAPTouch (TM) Programmable Controller for 2-Electrode Capacitance Sensor with SPI or I2C Interface I²C/Ser 2-Wire, Ser, SPI
    AD7143 16 43.5SPS 8 Single(+2.6 to +3.6) 3.6mW 20 ±2 CSP $1.25 CAPTouch (TM) Programmable Controller for 2-Electrode Capacitance Sensor with I2C Interface I²C/Ser 2-Wire, Ser
    AD7147 16 111SPS 13 Single(+3), Single(+3.3) 3.6mW 20 ±8 CSP $1.30 CAPTouch (TM) Programmable Controller w/ SPI or I2C Interface for Single-Electrode Cap Sensors I²C/Ser 2-Wire, Ser, SPI
    AD7148 16 4SPS 8 Multi(+3.3Anlg, +3.3Dig) 3.3mW 20 ±8 CSP $1.21 Programmable Touch Controller for Single Electrode Capacitance Sensors I²C/Ser 2-Wire, Ser
    AD7150 12 100SPS 2 Single(+2.7 to +3.6) 0.43mW 10 ±4 SOP $1.37 Ultra-Lo Pwr, 2-Ch Capacitance Converter for Proximity Sensing Applications I²C/Ser 2-Wire, Ser
    AD7151 12 100SPS 1 Single(+2.7 to +3.6) 0.3mW 10 ±4 SOP $1.37 Ultra-Low Power, 1-Ch, Capacitance Converter for Proximity Sensing Applications I²C/Ser 2-Wire, Ser
    AD7156 12 100SPS 2 Single(+1.8), Single(+2.5), Single(+2.7), Single(+3), Single(+3.3), Single(+3.6) 306µW - - CSP $1.25 Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter I²C/Ser 2-Wire, Ser
    AD7745 24 90SPS 1 Single(+2.7 to +5.25) 4.25mW 17 ±4 SOP $4.66 24-Bit, Cap-to-Dig Conv. w/ 1 SE/Diff Capacitive Input Ch for Interface to Dual Electrode Cap Sensor I²C/Ser 2-Wire, Ser
    AD7746 24 90SPS 2 Single(+2.7 to +5.25) 4.25mW 17 ±4 SOP $5.01 24-bit, Cap-to-Dig Conv. w/ 2 SE/Diff Capacitive Input Ch for interface to Dual Electrode Cap Sensor I²C/Ser 2-Wire, Ser
    AD7747 24 45.5SPS 1 Single(+2.7 to +5.25) 4.25mW 17 ±8 SOP $4.66 24-bit, Cap-to-Dig Conv w/1 SE/Diff Capacitive Input Ch for interface to Single Electrode Cap Sensor I²C/Ser 2-Wire, Ser

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    *The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    **Sample availability may be better than production availability. Please enter samples iinto your cart to check sample availability.

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