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Standard 3-Wire Mode (Figure 3) Refer to the Serial Inte rface Ope rating Sequence in Figure 1. When operating in 3-wire mode, the LTC1329-10/ LTC1 329-50/LTC1 329A-50 willinte rface directly with most standard 3- or 4-wire serial interface systems. The clock (CLK) input synchronizes the data transfer with each input bit captured at the rising edge of CLK and each output data bit shifted out through DOUT at the falling edge. A falling edge at CS initiates the data transfer and brings the DOUT pin out ofthree-state.The seria1 8-bit data representing the new DAC setting is shifted into the DIN pin. Simulta- neously, the previous DAC setting is shifted out of the DOUT pin. After the new data is shifted in, a rising edge at CS transfers the data from the input shift register into the DAC register. The DAC output assumes the new value and the DOUT pin returns to a high-impedance state.
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