AFE78201RRUR

Analog Front End (AFE) Overview

The Texas Instruments AFE78201RRUR is a 14-bit digital-to-analog converter (DAC) in a 24-pin UQFN package. It features a voltage output range of 0V to 2.5V with a maximum total unadjusted error (TUE) of 0.07% FSR from –40°C to +125°C. The device integrates a 1.25V voltage reference, a 12-bit diagnostic ADC operating at 3.84kSPS, and an internal 1.2288MHz oscillator. Quiescent current is 170µA typical. Digital interfaces include SPI and UART. Operating temperature ranges from –55°C to +125°C.

Analog Front End (AFE) Feature Summary

• 14-bit monotonic DAC with 0.07% max TUE over extended temperature
• Integrated 1.25V reference (10ppm/°C) and 12-bit diagnostic ADC
• Low quiescent current: 170µA typical, 210µA maximum
• Supports SPI and UART digital interfaces with fault detection

Analog Front End (AFE) Applications

• Process control and industrial automation systems
• PLC or DCS I/O modules
• 3-wire and 4-wire transmitters
• 4mA-to-20mA loop-powered applications

Analog Front End (AFE) Procurement Notes

Verify the RRU suffix corresponds to the 24-pin UQFN (4.00mm × 4.00mm) package configuration. Confirm that external voltage-to-current conversion and power regulation are included in the design, as these components are not integrated within the AFE78201 device itself.

Analog Front End (AFE) Selection Notes

Select the AFE78201 for 14-bit resolution requirements; use the AFE88201 if 16-bit resolution is necessary. Ensure the application supports the 0V to 2.5V output swing and accommodates the required external load capacitance (70nF to 130nF) for the internal reference stability.

Analog Front End (AFE) Part Context

The AFE78201 belongs to the AFEx8201 family, which also includes the 16-bit AFE88201. Both devices share identical pinouts, interfaces, and low-power characteristics, differing primarily in DAC resolution and associated linearity specifications.

Analog Front End (AFE) Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

Analog Front End (AFE) FAQ

What is the function of the REF_EN pin?

The REF_EN pin enables the internal 1.25V voltage reference when set to logic high. If set to logic low, the internal reference is disabled, requiring an external 1.25V reference source at the VREFIO pin.

How does the device handle fault detection?

The AFE78201 uses CRC bit error checking, a windowed watchdog timer, and a diagnostic ADC to monitor internal nodes such as bias sources, power regulator, and die temperature. Faults can trigger an interrupt or force the device into a user-specified fail-safe state.

What are the supported digital communication interfaces?

The device supports Serial Peripheral Interface (SPI) with clock rates up to 12.5 MHz and Universal Asynchronous Receiver-Transmitter (UART) communication.