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AD7008PCB Datasheet(PDF) 6 Page - Analog Devices |
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AD7008PCB Datasheet(HTML) 6 Page - Analog Devices |
6 / 16 page REV. B –6– AD7008 AD7008 REGISTER AND CONTROL LOGIC 32 12 20 32 12 PHASE ACCUMULATOR ACCUM RESET SLEEP AM ENABLE PHASE SUMMATION 12 SIN COS ROM 10 10 10 10 DAC 10 SIN/ COS SUMMATION 11 PIPELINE DELAYS 13 PIPELINE DELAYS 9:0 19:10 IOUT/ IOUT 14 PIPELINE DELAYS Figure 7. AD7008 CMOS DDS Modulator (See Table I) CS (27) D0-D15 (19-26, 8-15) TC0-TC3 ACCUMULATOR RESET CLK D Q x 6 DQ x 6 D Q x 6 DQ x 6 DQ x 6 PASS 1 0 x 6 CLK LOAD (36) FSEL (31) (32-35) DQ DQ DQ CLK RESET (38) RESET SYNCHRONIZATION TRANSFER CONTROL (TC) REGISTER CLK D Q x 5 TC0 TC1 LOAD TC3 TC2 D Q TC3 TC2 0 1 2 3 4 S E 0 1 2 3 2 3 4 D Q x 20 E FREQ 0 FREQ 1 FREQUENCY REGISTERS PHASE REGISTER D Q x 12 E CLK D Q x 32 E IQ MOD REGISTER 1 0 x32 TO PHASE SUMMATION TO SIN/COS SUMMATION TO PHASE ACCUMULATOR CLK CLK CLK 32 32 12 10 TRANSFER DECODE FSELECT CLOCK (30) x 5 D FLIP-FLOPS ARE MASTER SLAVE, LATCHING DATA ON CLK RISING EDGE. CLK 1 0 x 24 WR (16) SCLK (41) SDATA (42) SLEEP (37) 15:0 23:8 15:8 7:0 23:0 7:0 D Q x 32 32-BIT SERIAL ASSEMBLY REGISTER 32-BIT PARALLEL ASSEMBLY REGISTER DQ x 32 REGISTER MUX 31:0 31:0 DQ x 4 DQ CLK 3:0 1 0 x 32 DQ D1 D2 BUS MODE SYNCHRO LOGIC D0 D3 DQ DQ CLK AM ENABLE SLEEP COMMAND REGISTER CLK CLK PASS FLIP-FLOPS ARE TRANSPARENT WHEN THE CLOCK IS LOW. CLK 0 1 31:8 D Q x 32 E 5 6 Figure 8. AD7008 Register and Control Logic |
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