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AFE781H1RRUR - Low-Power DACs With Internal HART® Modem, Voltage Reference, and Diagnostic ADC for 4mA to 20mA Loop-Powered Applications

Part Number: AFE781H1RRUR

Package: UQFN-24

Type: Digital To Analog Converters

Description: Low-Power DAC and Diagnostic ADC 2 Channel AFE UQFN-24 (4x4)

Product Overviews

AFE781H1RRUR is highly-integrated, high-accuracy, extremely low-power digital-to-analog converters (DACs) with voltage outputs designed for HARTenabled sensor-transmitter applications. The AFEx81H1 devices include most of the components required to design a 4mA to 20mA, 2‑wire (loop-powered) sensor transmitter. In addition to the highly accurate DAC, these parts include a HART-certified FSK modem, 10‑ppm/°C voltage reference, and diagnostic analog-to-digital converter (ADC).

Product Features

• Low quiescent current: 180µA (typical)

• 12-bit 3.84kSPS ADC for advanced diagnostics

• Integrated 1.25V reference at 10 ppm/°C (max)

• Internal 1.2288MHz oscillator with clock output

• Digital interface

– Serial peripheral interface (SPI): Shared bus for both DAC and HART

– Universal asynchronous receiver-transmitter (UART): Shared bus for both DAC and HART

– Both: SPI for DAC and UART for HART

• Fault detection: CRC bit error checking, windowed watchdog timer, diagnostic ADC

• Digital DAC slew-rate control

• Wide operating temperature: –55°C to +125°C

Applications

• 2-wire, 4-mA to 20-mA loop-powered transmitters

• Process control and industrial automation

• Smart transmitters

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