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A5191HRTLG-XTD Datasheet(PDF) 5 Page - ON Semiconductor

Part # A5191HRTLG-XTD
Description  HART Modem
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

A5191HRTLG-XTD Datasheet(HTML) 5 Page - ON Semiconductor

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A5191HRT
The internal HART modem modulates the transmit-signal and demodulates the receive signal. The transmit-signal shaper enables the
A5191HRT to transmit a HART compliant signal. The carrier is detected by comparing the receiver filter output with the difference
between two external voltage references. The analog receive circuitry band-pass filters the received signal for input to the modem and
the carrier detect circuitry. The oscillator provides the modem with a stable time base using either a simple external resonator or an
external clock source.
Figure 4: A5191HRT Block Diagram
4.1 A5191HRT Logic
The modem consists of a modulator and demodulator. The modem uses shift frequencies of nominally 1200Hz (for a 1) and 220Hz (for
a 0). The bit rate is 1200 bits/second.
4.1.1. Modulator
The modulator accepts digital data in NRZ form at the ITXD input and generates the FSK modulated signal at the OTXA output. INRTS
must be a logic low for the modulator to be active.
4.1.2. Demodulator
The demodulator accepts an FSK signal at the IRXA input and reproduces the original modulating signal at the ORXD output. The
nominal bit rate is 1200 bits per second. Figure 5 illustrates the demodulation process.
Figure 5: Demodulator Signal Timing
The output of the demodulator is qualified with the carrier detect signal (OCD), therefore, only IRXA signals large enough to be detected
(100mVp-p typically) by the carrier detect circuit produce received serial data at ORXD.
Maximum demodulator jitter is 12 percent of one bit given input frequencies within HART specifications, a clock frequency of 460.8kHz
(±1.0 percent) and zero input (IRXA) asymmetry.
Rev. 3 | Page 5 of 13 | www.onsemi.com


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