Texas Instruments ADS868x 16-Bit SAR Analog-to-Digital Converter
Texas Instruments ADS868x 16-Bit 4 or 8-Channel SAR Analog-to-Digital Converters (ADC) that are an integrated data acquisition system based on a 16-bit successive approximation (SAR) analog-to-digital converter (ADC), operating at a throughput of 500kSPS. The devices feature integrated analog front-end circuitry for each input channel with overvoltage protection up to ±20V, a four or eight-channel multiplexer with automatic and manual scanning modes, and an on-chip, 4.096V reference with low temperature drift.
Operating on a single 5V analog supply, each input channel on the devices can support true bipolar input ranges of ±10.24V, ±5.12V, and ±2.56V, as well as unipolar input ranges of 0V to 10.24V and 0V to 5.12V. The gain of the analog front-end for all input ranges is accurately trimmed to ensure high dc precision. The input range selection is software-programmable and independent for each channel. The devices offer a 1MΩ constant resistive input impedance irrespective of the selected input range. Texas Instruments ADS868x also offers a simple SPI-compatible serial interface to the digital host and supports daisy-chaining of multiple devices. The digital supply operates from 1.65V to 5.25V, enabling a direct interface to a wide range of host controllers.
Features
- 16-Bit ADC with Integrated Analog Front-End
- Four or eight-channel MUX with Auto and Manual Scan
- Channel-Independent Programmable Input Ranges
- Bipolar: ±10.24V, ±5.12V, and ±2.56V
- Unipolar: 0V to 10.24V and 0V to 5.12V
- 5V Analog Supply: 1.65V to 5V I/O Supply
- Constant Resistive Input Impedance: 1MΩ
- Input Overvoltage Protection: Up to ±20V
- On-Chip, 4.096V Reference with Low Drift
- Excellent Performance
- 500kSPS Aggregate Throughput
- DNL: ±0.5LSB; INL: ±0.75LSB
- Low Drift for Gain Error and Offset
- SNR: 92dB; THD: -102dB
- Low Power: 65mW
Applications
- Power Automation
- Protection Relays
- PLC Analog Input Modules
Block Diagram
