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ADS8681 Datasheet(PDF) 1 Page - Texas Instruments |
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ADS8681 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 8 page Oscillator CS SCLK SDI SDO PGA 1 M: OVP 1 M: OVP 2nd-Order LPF ADC Driver VBIAS AIN_P AIN_GND 16-Bit SAR ADC 4.096-V Reference REFGND DGND AGND DVDD AVDD ADS8681 Digital Logic and Interface REFIO REFCAP Product Folder Sample & Buy Technical Documents Tools & Software Support & Community An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCT PREVIEW Information. Product in design phase of development. Subject to change or discontinuance without notice. ADS8681 SBAS633 – FEBRUARY 2016 ADS8681 16-Bit, 1-MSPS, Single-Supply, SAR ADC Data Acquisition System with Programmable, Bipolar Input Ranges 1 1 Features 1 • 16-Bit ADC with Integrated Analog Front-End • Software Programmable Input Ranges: – Bipolar Ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V and ±2.56 V – Unipolar Ranges: 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V and 0 V–5.12 V • 5-V Analog Supply: 1.65-V to 5-V I/O Supply • Constant Resistive Input Impedance ≥ 1 MΩ • Input Overvoltage Protection: Up to ±20 V • On-Chip 4.096-V Reference with Low Drift • Excellent Performance: – 1-MSPS Aggregate Throughput – DNL: ±0.5 LSB; INL: ±0.75 LSB – SNR: 90 dB; THD: –102 dB • multiSPI™ Interface with Daisy-Chain • Industrial Temperature Range: –40°C to +125°C • Packages: – 16-Pin TSSOP (5.0 mm × 4.4 mm) – 16-Pin WQFN-16 package (4.0 mm × 4.0 mm) 2 Applications • Channel-Isolated PLC Analog Input Modules • Test and Measurement • Battery Pack Monitoring 3 Description The ADS8681 is an integrated data acquisition system based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 1 -MSPS. The device features a high- precision SAR ADC, integrated analog front-end input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift. Operating on a single 5-V analog supply, the ADS8681 can support true bipolar input ranges of ±12.288 V, ±6.144 V, ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 12.288 V, 0 V to 10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V. The gain and offset errors for the analog front end circuit are accurately trimmed within the specified values for each input range to ensure high dc precision. The input range selection is done by software programming of the device internal registers. The device offers a high resistive input impedance ( ≥ 1 MΩ) irrespective of the selected input range. The ADS8681 offers an enhanced SPI-compatible serial interface (multiSPI) to the digital host and also supports daisy-chaining of multiple devices. The digital supply can operate from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers. Device Information PART NUMBER PACKAGE BODY SIZE (NOM) ADS8681 TSSOP (16) 5.0 mm × 4.4 mm WQFN (16) 4.0 mm × 4.0 mm Block Diagram |
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