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ADC0809CCVX 데이터시트(PDF) 11 Page - Texas Instruments |
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ADC0809CCVX 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 20 page ADC0808-N, ADC0809-N www.ti.com SNAS535H – OCTOBER 1999 – REVISED MARCH 2013 The ADC0808 needs less than a milliamp of supply current so developing the supply from the reference is readily accomplished. In Figure 13 a ground referenced system is shown which generates the supply from the reference. The buffer shown can be an op amp of sufficient drive to supply the milliamp of supply current and the desired bus drive, or if a capacitive bus is driven by the outputs a large capacitor will supply the transient supply current as seen in Figure 14. The LM301 is overcompensated to insure stability when loaded by the 10 μF output capacitor. The top and bottom ladder voltages cannot exceed VCC and ground, respectively, but they can be symmetrically less than VCC and greater than ground. The center of the ladder voltage should always be near the center of the supply. The sensitivity of the converter can be increased, (i.e., size of the LSB steps decreased) by using a symmetrical reference system. In Figure 15, a 2.5V reference is symmetrically centered about VCC/2 since the same current flows in identical resistors. This system with a 2.5V reference allows the LSB bit to be half the size of a 5V reference system. Figure 12. Ground Referenced Conversion System Using Trimmed Supply Figure 13. Ground Referenced Conversion System with Reference Generating VCC Supply Copyright © 1999–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: ADC0808-N ADC0809-N |
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