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AMC1336 датащи(PDF) 11 Page - Texas Instruments |
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AMC1336 датащи(HTML) 11 Page - Texas Instruments |
11 / 31 page Band-Gap Reference DOUT CLKIN DVDD DGND AINP AINN AMC1336 AVDD Diagnostic û Modulator AGND AVDD Reinforced Isolation Barrier Charge Pump 11 AMC1336 www.ti.com SBAS951 – AUGUST 2019 Product Folder Links: AMC1336 Submit Documentation Feedback Copyright © 2019, Texas Instruments Incorporated 7 Detailed Description 7.1 Overview The differential analog input (comprised of input signals AINP and AINN) of the AMC1336 is a chopper-stabilized buffer, followed by the switched-capacitor input of a second-order, delta-sigma (ΔΣ) modulator stage that digitizes the input signal into a 1-bit output stream. The data output DOUT of the converter provides a stream of digital ones and zeros that is synchronous to the externally provided clock source at the CLKIN pin with a frequency in the range of 9 MHz to 21 MHz. The time average of this serial bitstream output is proportional to the analog input voltage. The Functional Block Diagram section shows a detailed block diagram of the AMC1336. The 1.6-GΩ differential input resistance of the analog input stage supports low gain-error signal sensing in high-voltage applications using resistive dividers. The external clock input simplifies the synchronization of multiple current- sensing channels on the system level. The silicon-dioxide (SiO2)-based capacitive isolation barrier supports a high level of magnetic field immunity, as described in the ISO72x Digital Isolator Magnetic-Field Immunity application report, available for download at www.ti.com. 7.2 Functional Block Diagram 7.3 Feature Description 7.3.1 Analog Input The AMC1336 incorporates front-end circuitry that contains a buffered sampling stage, followed by a ΔΣ modulator. To support a bipolar input range with a unipolar high-side supply AVDD, the device uses a charge pump to simplify the overall system design and minimize circuit cost. For reduced offset and offset drift, the input buffer is chopper-stabilized with the switching frequency set at fCLKIN / 32. Figure 6 illustrates the spur created by the switching frequency. |
Аналогичный номер детали - AMC1336 |
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Аналогичное описание - AMC1336 |
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