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Series Information for AD7745ARUZ - Analog Devices


  • feature
    Capacitance-to-digital converter New standard in single chip solutions Interfaces to single or differential floating sensors Resolution down to 4 aF (that is, up to 21 ENOB) Accuracy: 4 fF Linearity: 0.01% Common-mode (not changing) capacitance up to 17 pF Full-scale (changing) capacitance range: u00b14 pF Tolerant of parasitic capacitance to ground up to 60 pF Update rate: 10 Hz to 90 Hz Simultaneous 50 Hz and 60 Hz rejection at 16 Hz Temperature sensor on-chip Resolution: 0.1u00b0C, accuracy: u00b12u00b0C Voltage input channel Internal clock oscillator 2-wire serial interface (I2Cu00ae-compatible) Power 2.7 V to 5.25 V single-supply operation 0.7 mA current consumption Operating temperature: u201340u00b0C to +125u00b0C 16-lead TSSOP package



The AD7745/AD7746 are a high resolution, Σ-Δ capacitance-to- digital converter (CDC). The capacitance to be measured is connected directly to the device inputs. The architecture fea- tures inherent high resolution (24-bit no missing codes, up to 21-bit effective resolution), high linearity (±0.01%), and high accuracy (±4 fF factory calibrated). The AD7745/AD7746 capacitance input range is ±4 pF (changing), while it can accept up to 17 pF common-mode capacitance (not changing), which can be balanced by a programmable on-chip, digital-to- capacitance converter (CAPDAC). The AD7745 has one capacitance input channel, while the AD7746 has two channels. Each channel can be configured as single-ended or differential. The AD7745/AD7746 are designed for floating capacitive sensors. For capacitive sensors with one plate connected to ground, the AD7747 is recommended. The parts have an on-chip temperature sensor with a resolution of 0.1°C and accuracy of ±2°C. The on-chip voltage reference and the on-chip clock generator eliminate the need for any external components in capacitive sensor applications. The parts have a standard voltage input, which together with the differential reference input allows easy interface to an external temperature sensor, such as an RTD, thermistor, or diode. The AD7745/AD7746 have a 2-wire, I2C-compatible serial interface. Both parts can operate with a single power supply from 2.7 V to 5.25 V. They are specified over the automotive temperature range of –40°C to +125°C and are housed in a 16-lead TSSOP package.


Resolution (Bits):
Sampling Rate:
Input Channel Type:
Differential Single Ended
Data Interface:
2 Wire I2C Serial
Supply Voltage Type:
Supply Voltage Min:
Supply Voltage Max:
ADC / DAC Case Style:
No. of Pins:
Operating Temperature Min:
Operating Temperature Max:
Product Range:
Automotive Qualification Standard:
RoHS Phthalates Compliant:
MSL 1 - Unlimited
No SVHC (07-Jul-2017)
Base Number:
IC Case Style:
IC Generic Number:
Logic Function Number:
No. of Channels:
Operating Temperature Range:
-40°C to +125°C
Supply Current:
Supply Voltage Range:
2.7V to 3.6V 4.75V to 5.25V
Supply Voltage Range - Analogue:
2.7V to 3.6V 4.75V to 5.25V
Termination Type:
Surface Mount Device

Alternate Descriptions

RS Components
Capacitance to Digital Converter 16TSSOP
Richardson RFPD
RS Components UK
Capacitance to Digital Converter 16TSSOP
RS Components DE
Kapazitäts-Digital-Wandler, AD7745ARUZ, 24 Bit- TSSOP 16-Pin Datenrate : 0.09ksps Montage-Typ : SMD Abmessungen : 5 x 4.4 x 1.05mm Breite : 4.4mm Betriebstemperatur max. : +125 °C Betriebstemperatur min. : -40 °C, Analog Devices
RS Components HK
Capacitance to Digital Converter 16TSSOP
RS Components JP
RS Components FR
Capacitance to Digital Converter 16TSSOP
RS Components CN
Capacitance to Digital Converter 16TSSOP
RS Components ES
Capacitance to Digital Converter 16TSSOP
RS Components NL
Capacitance to Digital Converter 16TSSOP
RS Components NO
Capacitance to Digital Converter 16TSSOP
RS Components US
Capacitance to Digital Converter 16TSSOP
RS Components SG
Capacitance to Digital Converter 16TSSOP
RS Components TW
Capacitance to Digital Converter 16TSSOP