AFE782H1 Series
Low-power AFE with HART ©, 14-bit DAC, 12-bit ADC for PLC and sensor transmitter applications
Manufacturer: Texas Instruments
Catalog
Low-power AFE with HART ©, 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: 180 µA (typical)HART-compliant physical layer modemProgrammable amplitude of TX signalsRX demodulator and band-pass filter16-bit or 14-bit monotonic high-performance DACDAC output range: 0 V to 2.5 VDigital DAC slew-rate control4-LSB INL at 16 bits0.07% FSR (max) TUE from –40°C to +125°C12-bit 3.84-kSPS ADC for advanced diagnosticsIntegrated 1.25-V reference at 10 ppm/°C (max)Internal 1.2288-MHz oscillator with clock outputDigital interfaceSerial peripheral interface (SPI): Shared bus for both DAC and HARTUniversal asynchronous receiver-transmitter (UART): Shared bus for both DAC and HARTBoth: SPI for DAC and UART for HARTFault 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: 180 µA (typical)HART-compliant physical layer modemProgrammable amplitude of TX signalsRX demodulator and band-pass filter16-bit or 14-bit monotonic high-performance DACDAC output range: 0 V to 2.5 VDigital DAC slew-rate control4-LSB INL at 16 bits0.07% FSR (max) TUE from –40°C to +125°C12-bit 3.84-kSPS ADC for advanced diagnosticsIntegrated 1.25-V reference at 10 ppm/°C (max)Internal 1.2288-MHz oscillator with clock outputDigital interfaceSerial peripheral interface (SPI): Shared bus for both DAC and HARTUniversal asynchronous receiver-transmitter (UART): Shared bus for both DAC and HARTBoth: SPI for DAC and UART for HARTFault detection: CRC bit error checking, windowed watchdog timer, diagnostic ADCWide operating temperature: –55°C to +125°C
Description
AI
The 16-bit AFE882H1 and 14-bit AFE782H1 (AFEx82H1) are highly-integrated, high-accuracy, extremely low-power DACs with voltage-outputs designed for HART-enabled process control and industrial automation applications.
The AFEx82H1 devices include most of the components required to design a 4‑mA to 20‑mA, 3‑wire or 4-wire sensor transmitter or analog output module. In addition to the highly accurate DAC, these devices include a HART®-compliant FSK modem, 10-ppm/°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 AFE882H1 and 14-bit AFE782H1 (AFEx82H1) are highly-integrated, high-accuracy, extremely low-power DACs with voltage-outputs designed for HART-enabled process control and industrial automation applications.
The AFEx82H1 devices include most of the components required to design a 4‑mA to 20‑mA, 3‑wire or 4-wire sensor transmitter or analog output module. In addition to the highly accurate DAC, these devices include a HART®-compliant FSK modem, 10-ppm/°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.
