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ADS8678 Dataheets PDF



Part Number ADS8678
Manufacturers Texas Instruments
Logo Texas Instruments
Description SAR ADC
Datasheet ADS8678 DatasheetADS8678 Datasheet (PDF)

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design ADS8674, ADS8678 SBAS627 – JULY 2015 ADS867x 14-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges Additional Channels in ADS8678 Multiplexer Gain (% FS) 1 Features •1 14-Bit ADCs with Integrated Analog Front-End • 4-, 8-Channel MUX with Auto and Manual Scan • Channel-Independent Programmable Inputs: – ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V – 10.24 V.

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Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design ADS8674, ADS8678 SBAS627 – JULY 2015 ADS867x 14-Bit, 500-kSPS, 4- and 8-Channel, Single-Supply, SAR ADCs with Bipolar Input Ranges Additional Channels in ADS8678 Multiplexer Gain (% FS) 1 Features •1 14-Bit ADCs with Integrated Analog Front-End • 4-, 8-Channel MUX with Auto and Manual Scan • Channel-Independent Programmable Inputs: – ±10.24 V, ±5.12 V, ±2.56 V, ±1.28 V, ±0.64 V – 10.24 V, 5.12 V, 2.56 V, 1.28 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: – 500-kSPS Aggregate Throughput – DNL: ±0.2 LSB; INL: ±0.25 LSB – Low Drift for Gain Error and Offset – SNR: 85 dB; THD: –100 dB – Low Power: 65 mW • AUX Input → Direct Connection to ADC Inputs • ALARM → High and Low Thresholds per Channel • SPI™-Compatible Interface with Daisy-Chain • Industrial Temperature Range: –40°C to 125°C • TSSOP-38 Package (9.7 mm × 4.4 mm) 1 M: AIN_0P OVP AIN_0GND OVP 1 M: 1 M: AIN_1P OVP AIN_1GND OVP 1 M: 1 M: AIN_2P OVP AIN_2GND OVP 1 M: 1 M: AIN_3P OVP AIN_3GND OVP 1 M: 1 M: AIN_4P OVP AIN_4GND OVP 1 M: 1 M: AIN_5P OVP AIN_5GND OVP 1 M: 1 M: AIN_6P OVP AIN_6GND OVP 1 M: 1 M: AIN_7P OVP AIN_7GND OVP 1 M: AUX_IN AUX_GND Block Diagram AVDD DVDD PGA 2nd-Order LPF ADC Driver VB0 ADS8678 ADS8674 PGA 2nd-Order LPF ADC Driver VB1 PGA 2nd-Order LPF ADC Driver VB2 PGA 2nd-Order LPF ADC Driver VB3 PGA 2nd-Order LPF ADC Driver VB4 PGA 2nd-Order LPF ADC Driver VB5 PGA 2nd-Order LPF ADC Driver VB6 PGA 2nd-Order LPF ADC Driver VB7 Digital Logic and Interface CS SCLK SDI 14-Bit SAR ADC SDO DAISY Oscillator REFSEL RST/PD ALARM REFCAP REFIO 4.096-V Reference AGND DGND REFGND 1 2 Applications • Power Automation • Protection Relays • PLC Analog Input Modules 3 Description The ADS8674 and ADS8678 are 4- and 8-channel, integrated data acquisition systems based on a 14-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 500 kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20 V, a 4- or 8-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096-V reference with low temperature drift. Operating on a single 5-V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24 V, ±5.12 V, ±2.56 V, ±1.28V and ±0.64V, as well as unipolar input ranges of 0 V to 10.24 V, 0 V to 5.12 V, 0 V to 2.56 V and 0 V to 1.28 V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure a high dc precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1-MΩ constant resistive input impedance irrespective of the selected input range. The ADS8674 and ADS8678 offer a simple SPIcompatible 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) ADS867x 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 0.05 0.03 0.01 -0.01 -0.03 -0.05 ±40 ---- ± 2.5*VREF, ---- “ 1.25*VREF ---- “ 0.625*VREF, ------“0.3125*VREF -------“0.156 VREF, ---- + 2.5*VREF ---- + 1.25*VREF, ---- + 0.625*VREF ---- + 0.3125*VREF ±7 26 59 92 Free-Air Temperature (oC) 125 C039 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. ADS8674, ADS8678 SBAS627 – JULY 2015 www.ti.com Table of Contents 1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Device Comparison Table..................................... 3 6 Pin Configuration and Functions ......................... 3 7 Specifications......................................................... 5 7.1 Absolute Maximum Ratings ...................................... 5 7.2 ESD Ratings.............................................................. 5 7.3 Recommended Operating Conditions....................... 5 7.4 Thermal Information .................................................. 5 7.5 Electrical Characteristics.......................


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