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ISO722MDRG4 Datasheet(PDF) 1 Page - Texas Instruments |
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ISO722MDRG4 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 22 page www.ti.com FEATURES APPLICATIONS DESCRIPTION _ + + _ Vref OSC + PWM BIAS POR ISO722 Only Filter Pulse Width Demodulation Carrier Detect _ + _ + Input + Filter Data MUX AC Detect 3-State Output Buffer IN EN Isolation Barrier DC Channel AC Channel FUNCTION DIAGRAM OUT Vref POR ISO721, ISO721M ISO722, ISO722M SLLS629B – JANUARY 2006 – REVISED MAY 2006 3.3-V / 5-V HIGH-SPEED DIGITAL ISOLATORS • Drop-In Replacement for Most Opto and Magnetic Isolators • 4000-V(peak) Isolation – UL 1577, IEC 60747-5-2 (VDE 0884, Rev. 2) IEC 61010-1 and CSA Approved • Industrial Fieldbus – 50 kV/µs Transient Immunity Typical – Modbus • Signaling Rate 0 Mbps to 150 Mbps – Profibus – Low-Propagation Delay – DeviceNet™ Data Buses – Low-Pulse Skew (Pulse-Width Distortion) – Smart Distributed Systems (SDS™) • Low-Power Sleep Mode • Computer Peripheral Interface • High-Electromagnetic Immunity • Servo Control Interface • Low-Input Current Requirement • Data Acquisition • Failsafe Output The ISO721, ISO721M, ISO722, and ISO722M are digital isolators with a logic input and output buffer separated by a silicon oxide (SiO2) insulation barrier. This barrier provides galvanic isolation of up to 4000 V. Used in conjunction with isolated power supplies, these devices prevent noise currents on a data bus or other circuits from entering the local ground, and interfering with or damaging sensitive circuitry. A binary input signal is conditioned, translated to a balanced signal, then differentiated by the capacitive isolation barrier. Across the isolation barrier, a differential comparator receives the logic transition information, then sets or resets a flip-flop and the output circuit accordingly. A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh pulse is not received for more than 4 µs, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit drives the output to a logic high state. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. SDS is a trademark of Honeywell. DeviceNet is a trademark of Open Devicenet Vendors Association, Inc. PRODUCTION DATA information is current as of publication date. Copyright © 2006, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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