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AD1580ART-REEL Arkusz danych(PDF) 10 Page - Analog Devices |
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AD1580ART-REEL Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 12 page AD1580 Rev. F | Page 10 of 12 The AD1580 is ideal for creating the reference level to use with 12-bit multiplying DACs, such as the AD7943, AD7945, and AD7948. In the single-supply bias mode (see Figure 26), the impedance seen looking into the IOUT2 terminal changes with DAC code. If the AD1580 drives IOUT2 and AGND directly, less than 0.2 LSBs of additional linearity error results. The buffer amp eliminates any linearity degradation that could result from variations in the reference level. DAC RBF AGND DGND A1 C1 3.3V 41.2k Ω 3.3V AD1580 SIGNAL GROUND A1: OP295 AD822 OP2283 A1 VREF VIN VDD IOUT1 IOUT2 VOUT AD7943/ AD7945/ AD7948 Figure 26. Single-Supply System |
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