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AFE782H1

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Low-power AFE with HART ©, 14-bit DAC, 12-bit ADC for PLC and sensor transmitter applications

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Data sheet

AFE782H1

ACTIVE
Data sheet Order now

Product details

Resolution (bps) 14 Number of DAC channels 1 Interface type SPI Output type Voltage Output voltage range (V) 0 to 2.5 INL (max) (±LSB) 4 Reference type INT/EXT Architecture STRING Rating Catalog Features 4-20mA loop transmitter, HART, HART Modem, Integrated Temp Sensor Power consumption (typ) (mW) 0.561 Operating temperature range (°C) -55 to 125 Product type Special-function DAC
Resolution (bps) 14 Number of DAC channels 1 Interface type SPI Output type Voltage Output voltage range (V) 0 to 2.5 INL (max) (±LSB) 4 Reference type INT/EXT Architecture STRING Rating Catalog Features 4-20mA loop transmitter, HART, HART Modem, Integrated Temp Sensor Power consumption (typ) (mW) 0.561 Operating temperature range (°C) -55 to 125 Product type Special-function DAC
UQFN (RRU) 24 16 mm² 4 x 4
  • Functional Safety-Capable
  • Low quiescent current: 180 µA (typical)
  • HART-compliant physical layer modem
    • Programmable amplitude of TX signals
    • RX demodulator and band-pass filter
  • 16-bit or 14-bit monotonic high-performance DAC
    • DAC output range: 0 V to 2.5 V
    • Digital DAC slew-rate control
    • 4-LSB INL at 16 bits
    • 0.07% FSR (max) TUE from –40°C to +125°C
  • 12-bit 3.84-kSPS ADC for advanced diagnostics
  • Integrated 1.25-V reference at 10 ppm/°C (max)
  • Internal 1.2288-MHz 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
  • Wide operating temperature: –55°C to +125°C
  • Functional Safety-Capable
  • Low quiescent current: 180 µA (typical)
  • HART-compliant physical layer modem
    • Programmable amplitude of TX signals
    • RX demodulator and band-pass filter
  • 16-bit or 14-bit monotonic high-performance DAC
    • DAC output range: 0 V to 2.5 V
    • Digital DAC slew-rate control
    • 4-LSB INL at 16 bits
    • 0.07% FSR (max) TUE from –40°C to +125°C
  • 12-bit 3.84-kSPS ADC for advanced diagnostics
  • Integrated 1.25-V reference at 10 ppm/°C (max)
  • Internal 1.2288-MHz 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
  • Wide operating temperature: –55°C to +125°C

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.
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* Data sheet AFEx82H1 16-Bit and 14-Bit, Low-Power Digital-to-Analog Converters (DACs) With Internal HART® Modem, Voltage Reference, and Diagnostic ADC for Process Control datasheet PDF | HTML 13 Dec 2023
Application note Design and Test of a HART-Enabled Field Transmitter for 4-20mA Loops PDF | HTML 17 Oct 2024
Application note A Basic Guide to the HART Protocol PDF | HTML 09 Nov 2023

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AFE882H1EVM — AFE882H1 evaluation module for a 16-bit, voltage-output, precision DAC and 16-bit ADC

The AFE882H1EVM evaluation module (EVM) is a platform for evaluating the AFE882H1 product, which is a highly-integrated, high-accuracy, and low-power 16-bit digital-to-analog converters (DACs) with voltage-outputs designed for HART-enabled sensor transmitter applications and analog output modules. (...)

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