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AD5934 Datasheet(PDF) 20 Page - Analog Devices |
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AD5934 Datasheet(HTML) 20 Page - Analog Devices |
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20 / 31 page  AD5934 Data Sheet Rev. E | Page 20 of 31 REGISTER MAP Table 7. Register Name Register Address Bits Function Control 0x80 D15 to D8 Read/write 0x81 D7 to D0 Read/write Start Frequency 0x82 D23 to D16 Read/write 0x83 D15 to D8 Read/write 0x84 D7 to D0 Read/write Frequency Increment 0x85 D23 to D16 Read/write 0x86 D15 to D8 Read/write 0x87 D7 to D0 Read/write Number of Increments 0x88 D15 to D8 Read/write 0x89 D7 to D0 Read/write Number of Settling Time Cycles 0x8A D15 to D8 Read/write 0x8B D7 to D0 Read/write Status 0x8F D7 to D0 Read only Real Data 0x94 D15 to D8 Read only 0x95 D7 to D0 Read only Imaginary Data 0x96 D15 to D8 Read only 0x97 D7 to D0 Read only CONTROL REGISTER (REGISTER ADDRESS 0x80, REGISTER ADDRESS 0x81) The AD5934 contains a 16-bit control register (Register Address 0x80 and Register Address 0x81) that sets the control modes. The default value of the control register upon reset is as follows: D15 to D0 is reset to 0xA008 upon power-up. The four MSBs of the control register are decoded to provide control functions, such as performing a frequency sweep, powering down the part, and controlling various other functions defined in the control register map. The user can choose to write only to Register Address 0x80 and to not alter the contents of Register Address 0x81. Note that the control register should not be written to as part of a block write command. The control register also allows the user to program the excitation voltage and set the system clock. A reset command to the control register does not reset any programmed values associated with the sweep (that is, start frequency, number of increments, frequency increment). After a reset command, an initialize with start frequency command must be issued to the control register to restart the frequency sweep sequence (see Figure 24). Table 8. D10 to D9 Control Register Map D10 D9 Range No. Output Voltage Range 0 0 1 2.0 V p-p typical 0 1 3 200 mV p-p typical 1 0 4 400 mV p-p typical 1 1 2 1.0 V p-p typical Table 9. D11 and D8 to D0 Control Register Map Bits Description D11 No operation D8 PGA gain; 0 = ×5, 1 = ×1 D7 Reserved; set to 0 D6 Reserved; set to 0 D5 Reserved; set to 0 D4 Reset D3 Reserved; set to 1 D2 Reserved; set to 0 D1 Reserved; set to 0 D0 Reserved; set to 0 Table 10. D15 to D12 Control Register Map D15 D14 D13 D12 Description 0 0 0 0 No operation 0 0 0 1 Initialize with start frequency 0 0 1 0 Start frequency sweep 0 0 1 1 Increment frequency 0 1 0 0 Repeat frequency 1 0 0 0 No operation 1 0 0 1 No operation 1 0 1 0 Power-down mode 1 0 1 1 Standby mode 1 1 0 0 No operation 1 1 0 1 No operation |
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