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DAC1220 Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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DAC1220 Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 14 page 9 ® Data Input Register (DIR) The DIR is a 24-bit register which contains the digital input value (see Table VIII). The register is latched on the falling edge of the last bit of the last byte sent. The contents of the DIR are then loaded into the modulator. This means that the DIR register can be updated after sending 1, 2, or 3 bytes, which is determined by the MB1 and MB0 bits in the Instruction Register. The contents of the DIR can be Offset Two’s Complement or Straight Binary. Offset Calibration Register (OCR) The OCR is a 24-bit register containing the offset correction factor that is used to apply a correction to the digital input before it is transferred to the modulator. The results of the self-calibration process will be written to this register. The OCR is both readable and writable via the serial inter- face. For applications requiring a more accurate calibration, a calibration can be performed, the results averaged, and a more precise offset calibration value written back to the OCR. The actual OCR value after calibration will change from part to part and with configuration, temperature, and power supply. In addition, be aware that the contents of the OCR are not used to directly correct the digital input. Rather, the correc- tion is a function of the OCR value. This function is linear and two known points can be used as a basis for interpolat- ing intermediate values for the OCR. The results of calibration are averaged, Offset Two's Comple- ment adjusted, and placed in the OCR. MSB (Bit Order) Bit—The MSB bit controls the order in which bits within a byte of data are read or written (either most significant bit first or least significant bit first) as follows: MD1 - MD0 (Operating Mode) Bits—The Operating Mode bits control the calibration functions of the DAC1220. The Normal mode is used to perform conversions. The Self- Calibration mode is a one-step calibration sequence that calibrates both the offset and full scale. MSB Byte 2 OCR23 OCR22 OCR21 OCR20 OCR19 OCR18 OCR17 OCR16 Byte 1 OCR15 OCR14 OCR13 OCR12 OCR11 OCR10 OCR9 OCR8 Byte 0 LSB OCR7 OCR6 OCR5 OCR4 OCR3 OCR2 OCR1 OCR0 TABLE VI. Offset Calibration Register. MSB Byte 2 FCR23 FCR22 FCR21 FCR20 FCR19 FCR18 FCR17 FCR16 Byte 1 FCR15 FCR14 FCR13 FCR12 FCR11 FCR10 FCR9 FCR8 Byte 0 LSB FCR7 FCR6 FCR5 FCR4 FCR3 FCR2 FCR1 FCR0 TABLE VII. Full-Scale Calibration Register. MSB Byte 2 DIR23 DIR22 DIR21 DIR20 DIR19 DIR18 DIR17 DIR16 Byte 1 DIR15 DIR14 DIR13 DIR12 DIR11 DIR10 DIR9 DIR8 Byte 0 LSB DIR7 DIR6 DIR5 DIR4 DIR3 DIR2 DIR1 DIR0 TABLE VIII. Data Input Register. Full-Scale Calibration Register (FCR) The FCR is a 24-bit register which contains the full-scale correction factor that is applied to the digital input before it is transferred to the modulator. The contents of this register will be the result of a self-calibration, or written to by the user. The FCR is both readable and writable via the serial inter- face. For applications requiring an accurate system calibra- tion, a system calibration can be performed, the results averaged, and a more precise value written back to the FCR. The actual FCR value after calibration will change from part to part and with configuration, temperature, and power supply. In addition, be aware that the contents of the FCR are not used to directly correct the digital input. Rather, the correc- tion is a function of the FCR value. This function is linear and two known points can be used as a basis for interpolat- ing intermediate values for the FCR. The contents of the FCR are in unsigned binary format. This is not affected by the DF bit in the Command register. MSB 0 MSB-First Default 1 LSB-First MD1 MD0 0 0 Normal Mode 0 1 Self-Cal 1 0 Sleep 11 X |
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