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AFE781H1

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14-bit low-power analog front end (AFE) with DAC, ADC and HART® modem for sensor transmitters

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Data sheet

AFE781H1

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) 0.15 to 1.25, 0.2 to 1.0, 0.3 to 2.5, 0.4 to 2.0 Reference type INT/EXT Architecture STRING Rating Catalog Features 4-20mA loop transmitter, HART, HART Modem Power consumption (typ) (mW) 0.342 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) 0.15 to 1.25, 0.2 to 1.0, 0.3 to 2.5, 0.4 to 2.0 Reference type INT/EXT Architecture STRING Rating Catalog Features 4-20mA loop transmitter, HART, HART Modem Power consumption (typ) (mW) 0.342 Operating temperature range (°C) -55 to 125 Product type Special-function DAC
UQFN (RRU) 24 16 mm² 4 x 4
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design: AFE881H1, AFE781H1
  • Low quiescent current: 180 µA (typical)
  • HART-compliant physical layer modem
  • 16-bit or 14-bit monotonic high-performance DAC
    • 1.8-V supply: 0.15 V to 1.25 V, 0.2 V to 1.0 V
    • 5-V supply: 0.3 V to 2.5 V, 0.4 V to 2.0 V
    • 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
  • Digital DAC slew-rate control
  • Wide operating temperature: –55°C to +125°C
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design: AFE881H1, AFE781H1
  • Low quiescent current: 180 µA (typical)
  • HART-compliant physical layer modem
  • 16-bit or 14-bit monotonic high-performance DAC
    • 1.8-V supply: 0.15 V to 1.25 V, 0.2 V to 1.0 V
    • 5-V supply: 0.3 V to 2.5 V, 0.4 V to 2.0 V
    • 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
  • Digital DAC slew-rate control
  • Wide operating temperature: –55°C to +125°C

The 16-bit AFE881H1 and 14-bit AFE781H1 ( AFEx81H1) are highly-integrated, high-accuracy, extremely low-power digital-to-analog converters (DACs) with voltage outputs designed for HART-enabled sensor-transmitter applications.

The AFEx81H1 devices include most of the components required to design a 4‑mA to 20‑mA, 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). 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. 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 fail-safe state corresponding to a standard NAMUR output value or user-specified custom value, or both.

These devices operate from supplies as low as 1.71 V with 220 µA maximum quiescent current. The devices are specified over the temperature range of –40°C to +125°C, but are functional from –55°C to +125°C.

The 16-bit AFE881H1 and 14-bit AFE781H1 ( AFEx81H1) are highly-integrated, high-accuracy, extremely low-power digital-to-analog converters (DACs) with voltage outputs designed for HART-enabled sensor-transmitter applications.

The AFEx81H1 devices include most of the components required to design a 4‑mA to 20‑mA, 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). 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. 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 fail-safe state corresponding to a standard NAMUR output value or user-specified custom value, or both.

These devices operate from supplies as low as 1.71 V with 220 µA maximum quiescent current. The devices are specified over the temperature range of –40°C to +125°C, but are functional from –55°C to +125°C.
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Type Title Date
* Data sheet AFEx81H1 16-Bit and 14-Bit, Low-Power DACs With Internal HART® Modem, Voltage Reference, and Diagnostic ADC for 4-mA to 20-mA Loop-Powered Applications datasheet PDF | HTML 15 Mar 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
Application brief Ultra-Low-Power, Low-Voltage, 2-Wire, 4- to 20-mA Loop Transmitter Using AFE881H PDF | HTML 03 Mar 2023
Functional safety information AFE781H1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 27 Sep 2022

Design & development

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GUI for evaluation module (EVM)

AFE881H1EVM-GUI — AFE881H1EVM GUI installer

The AFE881H1EVM-GUI is a windows-based software GUI that controls the AFE881H1EVM through SPI communications using the USB2ANY interface adapter tool.
Supported products & hardware

Supported products & hardware

Products
Precision DACs (≤10 MSPS)
AFE78101 — Single-channel 14-bit voltage analog front end (AFE) for sensor transmitters AFE781H1 — 14-bit low-power analog front end (AFE) with DAC, ADC and HART® modem for sensor transmitters AFE88101 — Single-channel low-power 16-bit DAC for sensor and field transmitter applications AFE881H1 — 16-bit low-power analog front end (AFE) with DAC, ADC and HART® modem for sensor transmitters
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