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AD7013ARS Datenblatt(PDF) 9 Page - Analog Devices |
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AD7013ARS Datenblatt(HTML) 9 Page - Analog Devices |
9 / 20 page REV. A AD7013 –9– Register Address Register Reset Name A3 A2 A1 A0 Size State Description COMMAND 0 0 1 0 9 Bits All Zeros The COMMAND register is used to select various operating modes of the AD7013. A detailed description of the COMMAND register is given in Table II. VERNIER 0 1 0 0 4 Bits All Zeros The VERNIER register allows additional group delay to be introduced into the I and Q ADCs. This provides a means to vary the ADC sampling instant. IRx OFFSET 0 1 0 1 10 Bits All Zeros The contents of the IRx OFFSET register are substracted from the I channel ADC word. When autocalibration is selected, this register is automatically loaded by the AD7013 at the beginning of a normal operation. When user calibration is selected, this register can be externally loaded with a twos complement offset 10-bit word to be subtracted from subsequent ADC samples. QRx OFFSET 0 1 1 0 10 Bits All Zeros The contents of the QRx OFFSET register are substracted from the Q channel ADC word. When auto calibration is selected, this register is automatically loaded by the AD7013 at the beginning of a normal operation. When user calibration is selected this register can be externally loaded with a twos complement offset 10-bit word to be subtracted from subsequent ADC samples. AUX DAC1 0 1 1 1 10 Bits All Zeros The 10-bit auxiliary DAC current output is determined by this register. The output current is equal to {AUX DAC1 FULL SCALE * N/2 10} where N is the 10-bit word contained in the AUX DAC1 register and AUX DAC1 FULL SCALE is determined by the value of RSET connected between FSADJUST and AGND. AUX DAC2 1 0 0 0 8 Bits All Zeros The 8-bit auxiliary DAC current output is determined by this register. The output current is equal to {AUX DAC1 FULL SCALE * N/2 8} where N is the 8-bit word contained in the AUX DAC2 register and AUX DAC2 FULL SCALE is determined by the value of RSET connected between FS ADJUST and AGND. AUX DAC3 1 0 0 1 8 Bits All Zeros The 8-bit auxiliary DAC current output is determined by this register. The output current is equal to {AUX DAC3 FULL SCALE * N/2 8} where N is the 8-bit word contained in the AUX DAC3 register and AUX DAC3 FULL SCALE is determined by the value of RSET connected between FS ADJUST and AGND. RESET 0 0 0 1 N/A N/A When this address in selected, all of the internal registers are initialized to their reset state. 6-Bit LOAD 0 0 1 1 N/A N/A When this address is used, a special loading sequence, as shown in Table IV, is used to write to any of the internal registers. N/A 0 0 0 0 N/A N/A No Action. N/A 1 1 1 1 N/A N/A No Action. Table I. Description and Address Map for AD7013 Internal Registers IRx OFFSET ADJUST Rx SAMPLING VERNIER AUX DAC1 AUX DAC2 QRx OFFSET ADJUST AUX DAC3 DATA IN A3 – A0 S1, S0 COMMAND REGISTER 6-BIT LOAD DATA BUFFER DB9 – DB0 MSB LSB 16-BIT SERIAL WORD Figure 6. AD7013 Registers |
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