The 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 uses Analog Devices, Inc., capacitance-to-digital converter (CDC) technology, which combines features important for interfacing to real sensors, such as high input sensitivity and high tolerance of both input parasitic ground capacitance and leakage current. The integrated adaptive threshold algorithm compensates for any variations in the sensor capacitance due to environmental factors like humidity and temperature or due to changes in the dielectric material over time.

By default, the AD7150 operates in standalone mode using the fixed power-up settings and indicates detection on two digital outputs. Alternatively, the AD7150 can be interfaced to a microcontroller via the serial interface, the internal registers can be programmed with user-defined settings, and the data and status can be read from the part.

The AD7150 operates with a 2.7 V to 3.6 V power supply. It is specified over the temperature range of −40°C to +85°C.

Applications

• Proximity sensing
• Contactless switching
• Position detection
• Level detection

Data Sheet, Rev. 0, 11/07

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	$1.35	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	$1.24	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
AD7150	12	100SPS	2	Single(+2.7 to +3.6)	0.43mW	10	±4	SOP	$1.35	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	$1.35	Ultra-Low Power, 1-Ch, Capacitance Converter for Proximity Sensing Applications	I²C/Ser 2-Wire, Ser
AD7745	24	90SPS	1	Single(+2.7 to +5.25)	4.25mW	17	±4	SOP	$4.60	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	$4.95	24-bit, Cap-to-Dig Conv. w/ 2 SE/Diff Capacitive Input Ch for interface to Dual Electrode Cap Sensor	I²C/Ser 2-Wire
AD7747	24	45.5SPS	1	Single(+2.7 to +5.25)	4.25mW	17	±8	SOP	$4.60	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

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
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• Automotive: -40 to +125 degrees Celsius

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