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AD5522JSVUZ データシート(PDF) 42 Page - Analog Devices |
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AD5522JSVUZ データシート(HTML) 42 Page - Analog Devices |
42 / 48 page AD5522 Preliminary Technical Data Rev. PrM | Page 42 of 48 SETTING UP THE DEVICE ON POWER ON On power on, default conditions are recalled from the power on reset register ensuring each PMU and DAC channel is powered up to a known condition. To operate the device, the user must: 1) Configure the device by writing to the System Control register to set up different functions as required. 2) Calibrate out errors and load required calibration values to (Gain) m and (Offset) c registers, and load codes to each DAC input register (x1). Once x1 values are loaded to the individual DACs, the calibration engine calculates the appropriate x2 value and stores it ready for the PMU address to call it. 3) Load the required PMU channel with the required force mode, current range etc. Loading the PMU channel configures the switches around the Force Amplifier, Measure function, clamps and comparators and also acts as a load signal for the DACs, loading the DAC register with the appropriate stored x2 value. 4) As the voltage and current ranges have individual DAC registers associated with them, each PMU register mode of operation calls a particular x2 register. Hence, only updates (changes to x1 register) to DACs associated with the selected mode of operation are reflected to the output of the PMU. If there is a change to the x1 value associated with a different PMU mode of operation, then this x1 value and it’s m and c coefficients are used to calculate a corresponding x2 value which is stored in the correct x2 register, but it does not get loaded to the DAC. CHANGING MODES There are different ways of handling a mode change: 1) Load any DAC x1 values that are required to change. Remember that x1 registers are available per voltage and current range (for Force Amplifier and Comparator DACs), so you can preload these and may not need to make changes. The calibration engine will calculate the x2 values and store them. 2) Now change into the new PMU mode. This will load the new switch conditions in the PMU circuitry and load the DAC register with the stored x2 data. or 1) Use the Hi-Z V or Hi-Z I mode in the PMU register, this makes the amplifier high impedance. 2) Now load any DAC x1 values that need to be loaded. Remember that x1 registers are available per voltage and current range, so you can preload these and may not need to make changes. 3) When the Hi-Z (V or I) modes are used, the relevant DAC outputs are automatically updated (FIN, CLL, CLH DACs). For example, when selecting Hi-Z V (Voltage), the FIN Voltage x2 result is loaded, offset and gain corrected, cached and loaded to the FIN DAC. When forcing a voltage, current clamps are engaged, so the CLL I (Current) register can be loaded, gain and offset corrected and loaded to the DAC register. Similarly, for the CLH I register. 4) Now change into the new PMU mode (FI/FV). This will load the new switch conditions in the PMU circuitry. As the DAC outputs are already loaded, transients when changing current or voltage mode will be minimized. |
同様の部品番号 - AD5522JSVUZ |
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同様の説明 - AD5522JSVUZ |
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