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AD9689-2000EBZ Datasheet(PDF) 40 Page - Analog Devices |
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AD9689-2000EBZ Datasheet(HTML) 40 Page - Analog Devices |
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40 / 134 page  AD9689 Data Sheet Rev. A | Page 40 of 134 PROGRAMMABLE FIR FILTERS SUPPORTED MODES The AD9689 supports the following modes of operation (the asterisk symbol (*) denotes convolution): • Real 48-tap filter for each I/Q channel (see Figure 104) • DOUT_I[n] = DIN_I[n] * XY_I[n] • DOUT_Q[n] = DIN_Q[n] * XY_Q[n] • Real 96-tap filter for on either I or Q channel (see Figure 105) • DOUT_I[n] = DIN_I[n] * XY_I_XY_Q[n] • DOUT_Q[n] = DIN_Q[n] • Real set of two cascaded 24-tap filters for each I/Q channel (see Figure 106) • DOUT_I[n] = DIN_I[n] * X_I[n] * Y_I[n] • DOUT_Q[n] = DIN_Q[n] * X_Q[n] * Y_Q[n] • Half complex filter using two real 48-tap filters for the I/Q channels (see Figure 107) • DOUT_I[n] = DIN_I[n] • DOUT_Q[n] = DIN_Q[n] * XY_Q[n] + DIN_I[n] * XY_I[n] • Full complex filter using four real 24-tap filters for the I/Q channels (see Figure 108) • DOUT_I[n] = DIN_I[n] * X_I[n] + DIN_Q[n] * Y_Q[n] • DOUT_Q[n] = DIN_Q[n] * X_Q[n] + DIN_I[n] * Y_I[n] ADC B CORE Q (IMAG) 48-TAP FIR FILTER xyQ [n] DINQ [n] DOUTQ [n] ADC A CORE I (REAL) 48-TAP FIR FILTER xyI [n] DINI [n] DOUTI [n] I′ (REAL) PROGRAMMABLE FILTER (PFILT) Q′ (IMAG) SIGNAL PROCESSING BLOCKS JESD204B INTERFACE Figure 104. Real 48-Tap Filter Configuration ADC B CORE Q (IMAG) DINQ [n] DOUTQ [n] ADC A CORE I (REAL) 96-TAP FIR FILTER xIyIxQyQ [n] DINI [n] DOUTI [n] I′ (REAL) PROGRAMMABLE FILTER (PFILT) Q′ (IMAG) SIGNAL PROCESSING BLOCKS JESD204B INTERFACE Figure 105. Real 96-Tap Filter Configuration |
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