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ADS8668IDBTR Datasheet(PDF) 1 Page - Texas Instruments |
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ADS8668IDBTR Datasheet(HTML) 1 Page - Texas Instruments |
1 / 79 page -0.05 -0.03 -0.01 0.01 0.03 0.05 ±40 ±7 26 59 92 125 Free-Air Temperature (oC) C039 ---- ± 2.5*V REF, ---- 1.25*VREF ---- 0.625*VREF, ------0.3125*VREF -------0.156 VREF, ---- + 2.5*VREF ---- + 1.25*V REF, ---- + 0.625*VREF ---- + 0.3125*V REF Oscillator CS SCLK SDI SDO DAISY REFSEL RST/PD REFCAP REFIO PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB0 AIN_0P AIN_0GND OVP PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB1 AIN_1P AIN_1GND OVP PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB2 AIN_2P AIN_2GND OVP PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB3 AIN_3P AIN_3GND OVP PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB4 AIN_4P AIN_4GND OVP PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB5 AIN_5P AIN_5GND OVP PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB6 AIN_6P AIN_6GND OVP PGA 1 M: OVP 1 M: 2nd-Order LPF ADC Driver VB7 AIN_7P AIN_7GND OVP AUX_IN AUX_GND 12-Bit SAR ADC Digital Logic and Interface 4.096-V Reference REFGND DGND AGND DVDD AVDD ADS8668 ADS8664 ALARM Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design ADS8664, ADS8668 SBAS492 – JULY 2015 ADS866x 12-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges 1 Features 2 Applications 1 • 12-Bit ADCs with Integrated Analog Front-End • Power Automation • 4-, 8-Channel MUX with Auto and Manual Scan • Protection Relays • Channel-Independent Programmable Inputs: • PLC Analog Input Modules – ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V 3 Description – 10.24 V, 5.12 V, 2.56 V, 1.28 V The ADS8664 and ADS8668 are 4- and 8-channel, • 5-V Analog Supply: 1.65-V to 5-V I/O Supply integrated data acquisition systems based on a 12-bit • Constant Resistive Input Impedance: 1 M Ω successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of • Input Overvoltage Protection: Up to ±20 V 500 kSPS. The devices feature integrated analog • On-Chip, 4.096-V Reference with Low Drift front-end circuitry for each input channel with • Excellent Performance: overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning – 500-kSPS Aggregate Throughput modes, and an on-chip, 4.096-V reference with low – DNL: ±0.2 LSB; INL: ±0.2 LSB temperature drift. Operating on a single 5-V analog – Low Drift for Gain Error and Offset supply, each input channel on the devices can – SNR: 73.8 dB; THD: –95 dB support true bipolar input ranges of ±10.24 V, ±5.12 V, ±2.56 V, ±1.28V and ±0.64V, as well as – Low Power: 65 mW unipolar input ranges of 0 V to 10.24 V, 0 V to 5.12 V, • AUX Input → Direct Connection to ADC Inputs 0 V to 2.56 V and 0 V to 1.28 V. The gain of the • ALARM → High and Low Thresholds per Channel analog front-end for all input ranges is accurately trimmed to ensure a high dc precision. The input • SPI™-Compatible Interface with Daisy-Chain range selection is software-programmable and • Industrial Temperature Range: –40°C to 125°C independent for each channel. The devices offer a • TSSOP-38 Package (9.7 mm × 4.4 mm) 1-M Ω constant resistive input impedance irrespective of the selected input range. Block Diagram The ADS8664 and ADS8668 offer a simple SPI- compatible serial interface to the digital host and also support daisy-chaining of multiple devices. The digital supply operates from 1.65 V to 5.25 V, enabling direct interface to a wide range of host controllers. Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) ADS866x TSSOP (38) 9.70 mm × 4.40 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. Gain Error versus Temperature 1 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. |
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