A5191HRTLG-XTD

Overview

The A5191HRTLG-XTD is a single-chip CMOS modem designed for Highway Addressable Remote Transducer (HART) field instruments and masters. It operates within a supply voltage range of 3.0 V to 5.5 V and supports an industrial temperature range from −40 °C to +85 °C. The device implements phase continuous frequency shift keying (FSK) at a baud rate of 1200 bits per second, utilizing Bell 202 shift frequencies of 1200 Hz and 2200 Hz. It is housed in a 32-pin LQFP package.

Feature Summary

• Integrates half-duplex FSK modulation and demodulation with transmit-signal wave shaping and receive band-pass filtering.
• Features low power consumption suitable for intrinsically safe applications by disabling receive circuits during transmission.
• Includes internal oscillator requiring a 460.8 kHz crystal or ceramic resonator, compatible with 3.3 V or 5 V microcontrollers.

Applications

• HART multiplexers
• HART modem interfaces
• 4–20 mA loop powered transmitters

Procurement Notes

Verify the specific suffix 'L' confirms the 32-pin LQFP package variant. Confirm RoHS compliance status as indicated by the 'G' suffix or marking. Check current availability status against discontinuation notices for older revisions. Ensure ordering quantities match the tray configuration specified in the official documentation.

Selection Notes

Select this component when designing HART physical layer interfaces requiring a single-chip solution. Ensure the design accommodates the required 460.8 kHz external clock source. Verify that the system power supply remains within the 3.0 V to 5.5 V operating range. Consider the 32-pin LQFP footprint constraints during PCB layout.

Part Context

This part belongs to the A5191HRT family of HART modems manufactured by onsemi. The 'L' suffix specifically denotes the 32-pin Low-Profile Quad Flat Pack (LQFP) package option. Other variants in the family include PLCC and QFN packages. The device satisfies HART physical layer requirements for process automation communication.

Replacement Considerations

Direct substitutes within the same package include other A5191HRT variants such as A5191HRTNG-XTD (QFN) or A5191HRTPG-XTD (PLCC), provided pin compatibility is verified. Cross-package replacements require schematic and layout modifications.