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ADS8661 Datasheet(PDF) 1 Page - Texas Instruments |
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ADS8661 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 71 page Oscillator CONVST/CS PGA 1 M: OVP 1 M: OVP 2 nd-Order LPF ADC Driver VBIAS AIN_P AIN_GND 4.096-V Reference REFGND DGND AGND DVDD AVDD Digital Logic and Interface REFIO REFCAP SCLK SDI SDO 12-Bit SAR ADC ADS866x Copyright © 2016, Texas Instruments Incorporated Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design 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. PRODUCTION DATA. ADS8661, ADS8665 SBAS780 – DECEMBER 2016 ADS866x 12-Bit, High-Speed, Single-Supply, SAR ADC Data Acquisition System with Programmable, Bipolar Input Ranges 1 1 Features 1 • 12-Bit ADC with Integrated Analog Front-End • High Speed: – ADS8661: 1.25 MSPS – ADS8665: 500 kSPS • 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: – DNL: ±0.1 LSB; INL: ±0.15 LSB – SNR: 74 dB; THD: –102 dB • ALARM → High, Low Thresholds per Channel • multiSPI™ Interface with Daisy-Chain • Extended Industrial Temperature Range: –40°C to +125°C 2 Applications • Channel-Isolated PLC Analog Input Modules • Test and Measurement • Battery Pack Monitoring 3 Description The ADS8661 and ADS8665 devices belong to a family of integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC). The devices feature a high-speed, high-precision SAR ADC, integrated analog front-end (AFE) input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift. The devices operate on a single 5-V analog supply, but 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 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 devices offer a high resistive input impedance ( ≥ 1 MΩ) irrespective of the selected input range. The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) ADS866x TSSOP (16) 5.00 mm × 4.40 mm WQFN (16) 4.00 mm × 4.00 mm (1) For all available packages, see the orderable addendum at the end of the data sheet. Block Diagram |
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