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AD5551BRZ-REEL7 Fiches technique(PDF) 13 Page - Analog Devices |
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AD5551BRZ-REEL7 Fiches technique(HTML) 13 Page - Analog Devices |
13 / 16 page AD5551/AD5552 Rev. A | Page 13 of 16 REFERENCE AND GROUND As the input impedance is code-dependent, the reference pin should be driven from a low-impedance source. The AD5551/ AD5552 operate with a voltage reference ranging from 2 V to VDD. Although DAC’s full-scale output voltage is determined by the reference, references below 2 V results in reduced accuracy. Table 6 and Table 7 outline the analog output voltage for particular digital codes. For optimum performance, Kelvin sense connections are provided on the AD5552. If the application does not require separate force and sense lines, they should be tied together close to the package to minimize voltage drops between the package leads and the internal die. ADR291 and ADR293 are suitable references for this product. POWER-ON RESET These parts have a power-on reset function to ensure the output is at a known state upon power-up. After power-up, the DAC register contains all zeros, until data is loaded from the serial register. However, the serial register is not cleared on power-up, so its contents are undefined. When loading data initially to the DAC, 14 bits or more should be loaded to prevent erroneous data appearing on the output. If more than 14 bits are loaded, only the last 14 are kept, and if fewer than 14 are loaded, bits remain from the previous word. If the AD5551/AD5552 needs to be interfaced with data shorter than 14 bits, the data should be padded with zeros at the LSBs. POWER SUPPLY AND REFERENCE BYPASSING For accurate high-resolution performance, it is recommended that the reference and supply pins be bypassed with a 10 μF tantalum capacitor in parallel with a 0.1 μF ceramic capacitor. |
Numéro de pièce similaire - AD5551BRZ-REEL7 |
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Description similaire - AD5551BRZ-REEL7 |
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