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ISO7320CQDRQ1 Datasheet(PDF) 11 Page - Texas Instruments |
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ISO7320CQDRQ1 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page OSC PWM VREF LPF VREF DCL OUT IN 0 1 S Isolation Barrier Low t Frequency Channel (DC...100 kbps) High t Frequency Channel (100 kbps...25 Mbps) Polarity and Threshold Selection Polarity and Threshold Selection ISO7320-Q1 ISO7321-Q1 www.ti.com SLLSER4 – NOVEMBER 2015 8 Detailed Description 8.1 Overview The isolator in Figure 14 is based on a capacitive isolation barrier technique. The I/O channel of the device consists of two internal data channels, a high-frequency (HF) channel with a bandwidth from 100 kbps up to 25 Mbps, and a low-frequency (LF) channel 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 via the inverter gate at the input. The following capacitor-resistor networks differentiate the signal into transient pulses, which then are converted into CMOS levels by a comparator. The transient pulses at the input of the comparator can be either above or below the common mode voltage VREF depending on whether the input bit transitions from 0 to 1 or 1 to 0. The comparator threshold is adjusted based on the expected bit transition. A decision logic (DCL) at the output of the HF channel comparator 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-frequency to the low-frequency channel. 8.2 Functional Block Diagram Figure 14. Conceptual Block Diagram of a Digital Capacitive Isolator 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, capable of passing the capacitive barrier. As the input is modulated, a low-pass filter (LPF) is required to remove the high-frequency carrier from the actual data before passing it on to the output multiplexer. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: ISO7320-Q1 ISO7321-Q1 |
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