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AD7705BRU 데이터시트(PDF) 11 Page - Analog Devices |
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AD7705BRU 데이터시트(HTML) 11 Page - Analog Devices |
11 / 32 page AD7705/AD7706 –11– REV. A Table VI. Register Selection RS2 RS1 RS0 Register Register Size 0 0 0 Communications Register 8 Bits 0 0 1 Setup Register 8 Bits 0 1 0 Clock Register 8 Bits 0 1 1 Data Register 16 Bits 1 0 0 Test Register 8 Bits 1 0 1 No Operation 1 1 0 Offset Register 24 Bits 1 1 1 Gain Register 24 Bits R/ W Read/ Write Select. This bit selects whether the next operation is a read or write operation to the selected register. A “0” indicates a write cycle for the next operation to the appropriate register, while a “1” indicates a read opera- tion from the appropriate register. STBY Standby. Writing a “1” to this bit puts the part into its standby or power-down mode. In this mode, the part con- sumes only 10 µA of power supply current. The part retains its calibration coefficients and control word informa- tion when in STANDBY. Writing a “0” to this bit places the part in its normal operating mode. CH1–CH0 Channel Select. These two bits select a channel for conversion or for access to the calibration coefficients as out- lined in Table VII. Three pairs of calibration registers on the part are used to store the calibration coefficients following a calibration on a channel. They are shown in Tables VII for the AD7705 and Table VIII for the AD7706 to indicate which channel combinations have independent calibration coefficients. With CH1 at Logic 1 and CH0 at a Logic 0, the part looks at the AIN1(–) input internally shorted to itself on the AD7705 or at COMMON internally shorted to itself on the AD7706. This can be used as a test method to evaluate the noise performance of the part with no external noise sources. In this mode, the AIN1(–)/COMMON input should be connected to an external voltage within the allowable common-mode range for the part. Table VII. Channel Selection for AD7705 CH1 CH0 AIN(+) AIN(–) Calibration Register Pair 0 0 AIN1(+) AIN1(–) Register Pair 0 0 1 AIN2(+) AIN2(–) Register Pair 1 1 0 AIN1(–) AIN1(–) Register Pair 0 1 1 AIN1(–) AIN2(–) Register Pair 2 Table VIII. Channel Selection for AD7706 CH1 CH0 AIN Reference Calibration Register Pair 0 0 AIN1 COMMON Register Pair 0 0 1 AIN2 COMMON Register Pair 1 1 0 COMMON COMMON Register Pair 0 1 1 AIN3 COMMON Register Pair 2 |
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