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AD5934 Datasheet(PDF) 19 Page - Analog Devices |
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AD5934 Datasheet(HTML) 19 Page - Analog Devices |
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19 / 32 page  AD5934 Rev. 0 | Page 19 of 32 REGISTER MAP Table 7. Register Name Register Address Register Data Read/Write Register CONTROL 80 h D15 to D8 Read/Write 81 h D7 to D0 Read/Write START FREQUENCY 82 h D23 to D16 Read/Write 83 h D15 to D8 Read/Write 84 h D7 to D0 Read/Write FREQUENCY INCREMENT 85 h D23 to D16 Read/Write 86 h D15 to D8 Read/Write 87 h D7 to D0 Read/Write NUMBER OF INCREMENTS 88 h D15 to D8 Read/Write 89 h D7 to D0 Read/Write NUMBER OF SETTLING TIME CYCLES 8A h D15 to D8 Read/Write 8B h D7 to D0 Read/Write STATUS 8F h D7 to D0 Read Only REAL DATA 94 h D15 to D8 Read Only 95 h D7 to D0 Read Only IMAGINARY DATA 96 h D15 to D8 Read Only 97 h D7 to D0 Read Only CONTROL REGISTER Table 8. 16-Bit Register 80 h D15 to D8 Read or Write 81 h D7 to D0 Read or Write The CONTROL register is a 16-bit register that sets the AD5934 control modes. The 4 MSBs of the CONTROL register are decoded to provide control functions, such as performing a frequency sweep, powering down the part, and various other control functions defined in the CONTROL register map. The user may choose to write only to Register Location 80 h and not to alter the contents of 81 h. 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 28). Default value upon reset: D15 to D0 reset to A0 00H upon power-up. The AD5934 contains a 16-bit control register (Address 80h and 81h) that sets the AD5934 control modes. Table 9. Control Register Map Bit D15 D14 D13 D12 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 D11 No operation D10 D9 Output voltage range 0 0 Range 1 ( 2.0 V p-p typ) 0 1 Range 3 (200 mV p-p typ) 1 0 Range 4 (400 mV p-p typ) 1 1 Range 2 (1.0 V p-p typ) 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 1 External System clock. Must be set to 1. D2 0 Must be Set to 0. D1 Reserved. Set to 0. D0 Reserved. Set to 0. |
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