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AD6684 Datasheet(PDF) 94 Page - Analog Devices |
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AD6684 Datasheet(HTML) 94 Page - Analog Devices |
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94 / 107 page  AD6684 Data Sheet Rev. 0 | Page 94 of 107 Address Name Bits Bit Name Settings Description Reset Access [1:0] DDC 1 decimation rate select Decimation filter selection. Complex outputs (complex to real disabled): 0x0 R/W 11 HB1 filter selection (decimate by 2). 00 HB2 + HB1 filter selection (decimate by 4). 01 HB3 + HB2 + HB1 filter selection (decimate by 8). 10 HB4 + HB3 + HB2 + HB1 filter selection (decimate by 16). Real outputs (complex to real enabled): 11 HB1 filter selection (decimate by 1). 00 HB2 + HB1 filter selection (decimate by 2). 01 HB3 + HB2 + HB1 filter selection (decimate by 4). 10 HB4 + HB3 + HB2 + HB1 filter selection (decimate by 8). 11 HB1 filter selection: decimate by 1 or 2. 00 HB2 + HB1 filter selection (decimate by 2 or 4). 01 HB3 + HB2 + HB1 filter selection (decimate by 4 or 8) 10 HB4 + HB3 + HB2 + HB1 filter selection (decimate by 8 or 16) 0x0331 Pair map DDC 1 input select [7:3] Reserved Reserved. 0x0 R 2 DDC 1 Q input select 0x1 R/W 0 Channel A. 1 Channel B. 1 Reserved Reserved. 0x0 R 0 DDC 1 I input select 0x1 R/W 0 Channel A. 1 Channel B. 0x0334 Pair map DDC 1 Phase Increment 0 [7:0] DDC 1 NCO frequency value, twos complement[7:0] NCO phase increment value. Twos complement phase increment value for the NCO. Complex mixing frequency = (DDC phase increment × fS)/248. 0x0 R/W 0x0335 Pair map DDC 1 Phase Increment 1 [7:0] DDC 1 NCO frequency value, twos complement[15:8] NCO phase increment value. Twos complement phase increment value for the NCO. Complex mixing frequency = (DDC phase increment × fS)/248. 0x0 R/W 0x0336 Pair map DDC 1 Phase Increment 2 [7:0] DDC 1 NCO frequency value, twos complement[23:16] NCO phase increment value. Twos complement phase increment value for the NCO. Complex mixing frequency = (DDC phase increment × fS)/248. 0x0 R/W 0x0337 Pair map DDC 1 Phase Increment 3 [7:0] DDC 1 NCO frequency value, twos complement[31:24] NCO phase increment value. Twos complement phase increment value for the NCO. Complex mixing frequency = (DDC phase increment × fS)/248. 0x0 R/W 0x0338 Pair map DDC 1 Phase Increment 4 [7:0] DDC 1 NCO frequency value, twos complement[39:32] NCO phase increment value. Twos complement phase increment value for the NCO. Complex mixing frequency = (DDC phase increment × fS)/248. 0x0 R/W 0x033A Pair map DDC 1 Phase Increment 5 [7:0] DDC 1 NCO frequency value, twos complement[47:40] NCO phase increment value. Twos complement phase increment value for the NCO. Complex mixing frequency = (DDC phase increment × fS)/248. 0x0 R/W 0x033D Pair map DDC 1 Phase Offset 0 [7:0] DDC 1 NCO phase value, twos complement[7:0] Twos complement phase offset value for the NCO. 0x0 R/W |
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