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AD558,pdf datasheet (P-Compati

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The AD558 consists of four major funcTIonal blocks, fabricatedon a single monolithic chip (see Figure 2). The main D-to-Aconverter secTIon uses eight equally-weighted laser-trimmedcurrent sources switched into a silicon-chromium thin-filmR/2R resistor ladder network to give a direct but unbuffered 0mV to 400 mV output range. The transistors that form theDAC switches are PNPs; this allows direct posiTIve-voltage logicinterface and a zero-based output range.
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