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AD6679 Datasheet(PDF) 76 Page - Analog Devices |
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AD6679 Datasheet(HTML) 76 Page - Analog Devices |
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76 / 81 page  AD6679 Data Sheet Rev. B | Page 76 of 81 Reg. Addr. (Hex) Register Name Bit 7 (MSB) Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 (LSB) Default Notes 0x350 DDC 2 control Mixer select 0 = real mixer 1 = complex mixer Gain select 0 = 0 dB gain 1 = 6 dB gain IF mode 00 = variable IF mode (mixers and NCO enabled) 01 = 0 Hz IF mode (mixer bypassed, NCO disabled) 10 = fADC/4 Hz IF mode (fADC/4 downmixing mode) 11 = test mode (mixer inputs forced to +FS, NCO enabled) Complex to real enable 0 = disabled 1 = enabled 0 Decimation rate select (complex to real disabled) 11 = decimate by 2 00 = decimate by 4 01 = decimate by 8 10 = decimate by 16 (complex to real enabled) 11 = decimate by 1 00 = decimate by 2 01 = decimate by 4 10 = decimate by 8 0x00 0x351 DDC 2 input selection 0 0 0 0 0 Q input select 0 = Ch. A 1 = Ch. B 0 I input select 0 = Ch. A 1 = Ch. B 0x00 0x354 DDC 2 frequency LSB DDC 2 NCO FTW[7:0], twos complement 0x00 0x355 DDC 2 frequency MSB X X X X DDC 2 NCO FTW[11:8], twos complement 0x00 0x360 DDC 2 phase LSB DDC 2 NCO POW[7:0], twos complement 0x00 0x361 DDC 2 phase MSB X X X X DDC 2 NCO POW[11:8], twos complement 0x00 0x367 DDC 2 output test mode selection 0 0 0 0 0 Q output test mode enable 0 = disabled 1 = enabled from Ch. B 0 I output test mode enable 0 = disabled 1 = enabled from Ch. A 0x00 0x370 DDC 3 control Mixer select 0 = real mixer 1 = complex mixer Gain select 0 = 0 dB gain 1 = 6 dB gain IF mode 00 = variable IF mode (mixers and NCO enabled) 01 = 0 Hz IF mode (mixer bypassed, NCO disabled) 10 = fADC/4 Hz IF mode (fADC/4 downmixing mode) 11 = test mode (mixer inputs forced to +FS, NCO enabled) Complex to real enable 0 = disabled 1 = enabled 0 Decimation rate select (complex to real disabled) 11 = decimate by 2 00 = decimate by 4 01 = decimate by 8 10 = decimate by 16 (complex to real enabled) 11 = decimate by 1 00 = decimate by 2 01 = decimate by 4 10 = decimate by 8 0x00 0x371 DDC 3 input selection 0 0 0 0 0 Q input select 0 = Ch. A 1 = Ch. B 0 I input select 0 = Ch. A 1 = Ch. B 0x05 0x374 DDC 3 frequency LSB DDC 3 NCO FTW[7:0], twos complement 0x00 0x375 DDC 3 frequency MSB X X X X DDC 3 NCO FTW[11:8], twos complement 0x00 0x380 DDC 3 phase LSB DDC 3 NCO POW[7:0], twos complement 0x00 0x381 DDC 3 phase MSB X X X X DDC 3 NCO POW[11:8], twos complement 0x00 0x387 DDC 3 output test mode selection 0 0 0 0 0 Q output test mode enable 0 = disabled 1 = enabled from Ch. B 0 I output test mode enable 0 = disabled 1 = enabled from Ch. A 0x00 NSR Decimate by 2 and Noise Shaping Requantizer (NSR) |
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