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AD6676EBZ 数据表(PDF) 73 Page - Analog Devices |
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AD6676EBZ 数据表(HTML) 73 Page - Analog Devices |
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73 / 90 page  Data Sheet AD6676 Rev. A | Page 73 of 90 Fine NCO Tuning Register Address: 0x142, Reset: 0x15, Name: MIX2_TUNING Table 58. Bit Descriptions for MIX2_TUNING Bits Bit Name Description Reset Access [7:0] MIX2_TUNING Mix2 Tuning. Fine down/upconversion frequency. For decimation Mode 1 and Mode 3, this twos complement number represents steps of F ADC/4096. For decimation Mode 2 and Mode 4, it represents steps of F ADC/3072. A positive number is a downconverion; a negative number is an upconversion. 0x15 RW This register has four copies, one for each of the ADC profiles. The default for Profile 0 is 0x21; the default for the other profiles is 0x00. At the default ADC clock rate of 3.2 GHz, the default Profile 0 downconversion frequency is (33/4096) × 3.2 GHz = 25.78125 MHz Coarse NCO Initial Phase Register Address: 0x143, Reset: 0x00, Name: MIX1_INIT Table 59. Bit Descriptions for MIX1_INIT Bits Bit Name Description Reset Access [7:6] RESERVED 0x0 RW [5:0] MIX1_INIT NCO1 Initial Phase. Initial phase of the coarse resolution NCO after synchronization with SYSREF, in units of 1/64 of a cycle. 0x00 RW This register has four copies, one for each of the ADC profiles. The default for Profile 0 is 0x00. Fine NCO Initial Phase LSB Register Address: 0x144, Reset: 0x00, Name: MIX2_INIT_LSB Table 60. Bit Descriptions for MIX2_INIT_LSB Bits Bit Name Description Reset Access [7:0] MIX2_INIT_LSB NCO2 Initial Phase. Initial phase of the fine resolution NCO after synchronization with SYSREF, in units of 1/1024 of a cycle. The two MSBs of the 10-bit value are in Register 0x145. 0x00 RW This register has four copies, one for each of the ADC profiles. The default for Profile 0 is 0x00. Fine NCO Initial Phase MSB Register Address: 0x145, Reset: 0x00, Name: MIX2_INIT_MSB Table 61. Bit Descriptions for MIX2_INIT_MSB Bits Bit Name Description Reset Access [7:2] RESERVED 0x00 RW [1:0] MIX2_INIT_MSB NCO2 Initial Phase. Initial phase of the fine resolution NCO after synchronization with SYSREF, in units of 1/1024 of a cycle. The LSBs of the 10-bit value are in Register 0x144. 0x0 RW This register has four copies, one for each of the ADC profiles. The default for Profile 0 is 0x00. Datapath Controls Register Address: 0x146, Reset: 0x00, Name: DP_CTRL Table 62. Bit Descriptions for DP_CTRL Bits Bit Name Description Reset Access [7:1] RESERVED 0x00 RW 0 NOT_2S_COMPL Output Data Format: twos complement = 0; straight binary = 1 |
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