Data Sheets   Rev 0, 05/2005 (pdf, 792K) Email PDF      Lead(Pb) - Free Data (Data Sheet Help)     Application Notes Evaluation Boards Price, Packaging, and Availability

	Product Description
	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...More

Specifications Resolution (Bits) 24bit T-Put Rate 90SPS # Chan 2 Pwr Diss (max) 4.25mW Sleep Pwr Diss 10µW Supply V Single(+2.7 to +5.25) Ain Range (2Vref) p-p, ± 4 pF (Delta C) Product Description 24-bit, Cap-to-Dig Conv. w/ 2 SE/Diff Capacitive Input Ch for interface to Dual Electrode Cap Sensor Ref Int/Ext Int/Ext Find Similar Products

Functional Block Diagram Enlarge Symbols and Footprints  Other Diagrams: Pin Out Diagram

Features 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: ±4 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: 0.1°C, accuracy: ±2°C Voltage input channel Internal clock oscillator 2-wire serial interface (I2C®-compatible) Power 2.7 V to 5.25 V single-supply operation 0.7 mA current consumption Operating temperature: –40°C to +125°C 16-lead TSSOP package

 

Design Tools ADIsimADC -- Web based version ADIsimADC simulates behavior using many critical specifications of data converters, including offset, gain, sample rate, bandwidth, jitter, latency, both AC and DC linearity. These models provide a way to validate performance of the converter at the system level to determine the applicability of a selected device.

 

Price, Packaging, and Availability Print Table AD7746 Model Options Model Status Package Pins Temp Range Price* (1000 pcs.) Available RoHS Compliant Samples Cart Purchase Cart AD7746ARUZ Prodn 16 ld TSSOP 16 Ind $4.95 - Y Material Declaration Add to Cart Add to Cart AD7746ARUZ-REEL Prodn 16 ld TSSOP 16 Ind $4.95 - Y Material Declaration Contact ADI Add to Cart AD7746ARUZ-REEL7 Prodn 16 ld TSSOP 16 Ind $4.95 - Y Material Declaration Contact ADI Add to Cart EVAL-AD7746EBZ Prodn EVALUATION BOARDS - TBD $150.00 5/23/2008 Y Contact ADI Add to Cart EVAL-AD7746LDZ Contact ADI EVALUATION BOARDS - TBD - 5/23/2008 Y Contact ADI Contact ADI 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. View Sales and Distribution Offices

 

 

Find Similar Products     Part# Resolution (Bits) T-Put Rate # Chan Supply V Pwr Diss (max) Input Base C (pF Max) Cin Range (pF) Pkg Type Price* (1000 pcs.) Sorry, there are no generics to display. * 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. Sorted by Resolution (Ascending), then # of Input Channels (Ascending)