Texas Instruments AFEx8201 16 or 14-Bit DACs
Texas Instrument AFEx8201 16 or 14-Bit Digital-to-Analog Converters (DACs) are highly integrated, high-accuracy, extremely low-power digital-to-analog converters (DACs) with voltage outputs designed for process-control and industrial-automation applications.
The Texas Instruments AFEx8201 includes most components required to design a 4mA to 20mA, 3-wire, or 4-wire sensor transmitter or analog output module. In addition to the highly accurate DAC, the AFEx8201 incorporates a 10ppm/°C voltage reference and diagnostic analog-to-digital converter (ADC). An external voltage-to-current conversion and power regulation are required to accommodate intrinsic and functional safety concerns.
The internal diagnostic ADC is multiplexed to several internal nodes by enabling an automatic self-health check. This check can detect errors or malfunctions of the internal power regulator, bias sources, voltage reference, die temperature, DAC output, and optional external voltage source. If any fault is detected from the diagnostic ADC, windowed watchdog timer, or CRC frame-error checking, the devices can optionally issue an interrupt, enter a user-specified fail-safe state, or both.
Features
- Functional Safety-Capable
- Documentation available to aid functional safety system design
- Low quiescent current of 170µA (typical), 210µA (maximum)
- 16-bit or 14-bit monotonic high-performance DAC
- 0V to 2.5V DAC output range
- Digital DAC slew-rate control
- 4LSB INL at 16 bits
- 0.07% FSR (max) TUE from –40°C to +125°C
- 12-bit 3.84kSPS ADC for advanced diagnostics
- Integrated 1.25V reference at 10ppm/°C (max)
- Internal 1.2288MHz oscillator with clock output
- Digital interfaces
- Serial peripheral interface (SPI)
- Universal asynchronous receiver-transmitter (UART)
- Fault detection: CRC bit error checking, windowed watchdog timer, diagnostic ADC
- –55°C to +125°C wide operating temperature
Applications
- Process control and industrial automation
- PLC or DCS I/O modules
- 3-wire and 4-wire transmitters
- 4mA to 20mA loop-powered applications
Simplified Block Diagram
Related Development Tool
Texas Instruments AFE882H1EVM Evaluation Module
Configured to evaluate the AFE882H1 highly integrated, high-accuracy, and low-power 16-bit DAC.