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ISO7521CDWR Datasheet(PDF) 11 Page - Texas Instruments |
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ISO7521CDWR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 25 page OSC PWM VREF VREF Isolation barrier LPF Out DCL 0 1 S IN Low-frequency channel (DC...100 kbps) High-frequency channel (100 kbps... 1 Mbps) ISO7520C, ISO7521C www.ti.com SLLSE39E – JUNE 2010 – REVISED MAY 2015 8 Detailed Description 8.1 Overview The isolator in Figure 7 is based on a capacitive isolation barrier technique. The I/O channel of the device consists of two internal data channels, a high-frequency channel (HF) with a bandwidth from 100 kbps up to 1 Mbps, and a low-frequency channel (LF) covering the range from 100 kbps down to DC. In principle, a single- ended input signal entering the HF-channel is split into a differential signal through the inverter gate at the input. The following capacitor-resistor networks differentiate the signal into transients, which then are converted into differential pulses by two comparators. The comparator outputs drive a NOR-gate flip-flop whose output feeds an output multiplexer. A decision logic (DCL) at the driving output of the flip-flop measures the durations between signal transients. If the duration between two consecutive transients exceeds a certain time limit, (as in the case of a low-frequency signal), the DCL forces the output-multiplexer to switch from the high- to the low frequency channel. Because low-frequency input signals require the internal capacitors to assume prohibitively large values, these signals are pulse-width modulated (PWM) with the carrier frequency of an internal oscillator, thus creating a sufficiently high frequency signal, capable of passing the capacitive barrier. As the input is modulated, a low-pass filter (LPF) is needed to remove the high-frequency carrier from the actual data before passing it on to the output multiplexer. 8.2 Functional Block Diagram Figure 7. Conceptual Block Diagram of a Digital Capacitive Isolator Copyright © 2010–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: ISO7520C ISO7521C |
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