AFE78201 Series
Low-power AFE with 14-bit DAC, 12-bit ADC for PLC and sensor transmitter applications
Manufacturer: Texas Instruments
Catalog
Low-power AFE with 14-bit DAC, 12-bit ADC for PLC and sensor transmitter applications
Key Features
• Functional Safety-CapableDocumentation available to aid functional safety system designLow quiescent current: 170µA (typical), 210µA (maximum)16-bit or 14-bit monotonic high-performance DACDAC output range: 0V to 2.5VDigital DAC slew-rate control4LSB INL at 16 bits0.07% FSR (max) TUE from –40°C to +125°C12-bit 3.84kSPS ADC for advanced diagnosticsIntegrated 1.25V reference at 10ppm/°C (max)Internal 1.2288MHz oscillator with clock outputDigital interfaces:Serial peripheral interface (SPI)Universal asynchronous receiver-transmitter (UART)Fault detection: CRC bit error checking, windowed watchdog timer, diagnostic ADCWide operating temperature: –55°C to +125°CFunctional Safety-CapableDocumentation available to aid functional safety system designLow quiescent current: 170µA (typical), 210µA (maximum)16-bit or 14-bit monotonic high-performance DACDAC output range: 0V to 2.5VDigital DAC slew-rate control4LSB INL at 16 bits0.07% FSR (max) TUE from –40°C to +125°C12-bit 3.84kSPS ADC for advanced diagnosticsIntegrated 1.25V reference at 10ppm/°C (max)Internal 1.2288MHz oscillator with clock outputDigital interfaces:Serial peripheral interface (SPI)Universal asynchronous receiver-transmitter (UART)Fault detection: CRC bit error checking, windowed watchdog timer, diagnostic ADCWide operating temperature: –55°C to +125°C
Description
AI
The 16-bit AFE88201 and 14-bit AFE78201 (AFEx8201) 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 AFEx8201 devices include most of the 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 incorporate a 10ppm/°C voltage reference and diagnostic analog-to-digital converter (ADC). To accommodate intrinsic and functional-safety concerns, external voltage-to-current conversion and power-regulation are required.
The internal diagnostic ADC is multiplexed to several internal nodes that enable an automatic self-health check. This check is capable of detecting errors or malfunctions of the internal bias sources, power regulator, voltage reference, DAC output, die temperature, and optional external voltage source. If any fault is detected from the diagnostic ADC, CRC frame-error checking, or windowed watchdog timer, the devices can optionally issue an interrupt, enter a user-specified fail-safe state, or both.
The 16-bit AFE88201 and 14-bit AFE78201 (AFEx8201) 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 AFEx8201 devices include most of the 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 incorporate a 10ppm/°C voltage reference and diagnostic analog-to-digital converter (ADC). To accommodate intrinsic and functional-safety concerns, external voltage-to-current conversion and power-regulation are required.
The internal diagnostic ADC is multiplexed to several internal nodes that enable an automatic self-health check. This check is capable of detecting errors or malfunctions of the internal bias sources, power regulator, voltage reference, DAC output, die temperature, and optional external voltage source. If any fault is detected from the diagnostic ADC, CRC frame-error checking, or windowed watchdog timer, the devices can optionally issue an interrupt, enter a user-specified fail-safe state, or both.
