Datenblatt-Suchmaschine für elektronische Bauteile |
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AMC1100DUB Datenblatt(PDF) 11 Page - Texas Instruments |
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AMC1100DUB Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 22 page S1 S1 C = 3 pF INP C = 3 pF INN VINN VINP VDD1 GND1 GND1 GND1 3 pF R = 28 kW IN 3 pF VINN VINP Equivalent Circuit R = IN f C · CLK DIFF 1 ( = 10 MHz) f CLK C = 3.6 pF IND GND1 GND1 400 W 400 W S2 S2 AGND + 0.8 V AGND + 0.8 V AMC1100 www.ti.com SBAS562 – APRIL 2012 THEORY OF OPERATION INTRODUCTION The differential analog input of the AMC1100 is a switched-capacitor circuit based on a second-order modulator stage that digitizes the input signal into a 1-bit output stream. The device compares the differential input signal (VIN = VINP – VINN) against the internal reference of 2.5 V using internal capacitors that are continuously charged and discharged with a typical frequency of 10 MHz. With the S1 switches closed, CIND charges to the voltage difference across VINP and VINN. For the discharge phase, both S1 switches open first and then both S2 switches close. CIND discharges to approximately AGND + 0.8 V during this phase. Figure 31 shows the simplified equivalent input circuitry. Figure 31. Equivalent Input Circuit The analog input range is tailored to directly accommodate a voltage drop across a shunt resistor used for current sensing. However, there are two restrictions on the analog input signals, VINP and VINN. If the input voltage exceeds the range AGND – 0.5 V to AVDD + 0.5 V, the input current must be limited to 10 mA to prevent the implemented input protection diodes from damage. In addition, the device linearity and noise performance are ensured only when the differential analog input voltage remains within ±250 mV. The isolated digital bit stream is processed by a third-order analog filter on the low-side and presented as a differential output of the device. The SiO2-based capacitive isolation barrier supports a high level of magnetic field immunity, as described in application report SLLA181, ISO72x Digital Isolator Magnetic-Field Immunity (available for download at www.ti.com). Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): AMC1100 |
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