ADS8675IPWR

The ADS8671 and ADS8675 belong to the integrated data acquisition system series based on successive approximation register (SAR) analog-to-digital converters (ADCs). These devices feature a high-speed, high-precision SAR ADC, an integrated analog front-end (AFE) input driver circuit, an overvoltage protection circuit up to ±20V, and an on-chip 4.096V reference voltage with extremely low temperature drift. These devices are powered by a 5V analog supply and support actual bipolar input ranges of ±12.288V, ±6.144V, ±10.24V, ±5.12V, and ±2.56V, as well as unipolar input ranges of 0V to 12.288V, 0V to 10.24V, 0V to 6.144V, and 0V to 5.12V. The gain and offset errors for each input range can be adjusted within specific value ranges to ensure high DC accuracy. The input range can be selected by programming the device's internal registers. These devices offer a high-resistive input impedance (≥1MΩ), which is independent of the selected input range. The multiSPI digital interface is backward compatible with the traditional SPI protocol. Additionally, the configurable features simplify the interface with various host controllers.

Applications

• Analog input modules
• Mixed modules (AI, AO, DI, DO)
• Data acquisition (DAQ)
• Trackside signaling and control

Key features

• 14-bit ADC with integrated analog front end
• High speed:
• ADS8671: 1MSPS
• ADS8675: 500kSPS
• Software-programmable input ranges:
• Bipolar ranges: ±12.288V, ±10.24V, ±6.144V, ±5.12V, and ±2.56V
• Unipolar ranges: 0V–12.288V, 0V–10.24V, 0V–6.144V, and 0V–5.12V
• 5V analog supply, 1.65V to 5V I/O supply
• Constant resistive input impedance ≥ 1MΩ
• Input overvoltage protection: up to ±20V
• 4.096V on-chip low-drift reference voltage
• Excellent performance