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AD5520 Datasheet(PDF) 13 Page - Analog Devices |
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AD5520 Datasheet(HTML) 13 Page - Analog Devices |
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13 / 20 page  REV. A AD5520 –13– CIRCUIT OPERATION Force Voltage Most PMU measurements are performed while in force voltage and measure current modes, for example, when the device is used as a device power supply, or in continuity or leakage testing. In the force voltage mode, the voltage at analog input FIN is mapped directly to the voltage forced at the DUT. When in force voltage and measure current modes, the maxi- mum voltage applied to the input corresponds to the maximum current outputs. Figure 4 shows the transfer function when forcing a voltage. VDUT VCLH RS 16 RDUT VCLL RS 16 RDUT VCLH RS 16 IDUT VCLH VCLH VFIN VFIN VCLL RS 16 Figure 4. Voltage Force Transfer Function Measure Current Figure 5 shows a simplified diagram of the PMU when in force voltage mode. The control loop consists of the force amplifier with the voltage sense amplifier making up the feedback path. Current flowing through the DUT is measured by sensing the current flowing through a selectable sense resistor, which is in series with the DUT. The current sense amplifier (Gain = 16) generates a voltage at its output, which is proportional to the current flowing through the DUT. This voltage is compared to the CLL and CLH levels to ensure the clamp voltages have not been exceeded. Strobing CPCK and STB will provide information about the voltage level with respect to the comparator levels, CPH and CPL. MEASIHx MEASIL G = 16 MEASVH MEASVL G = 1 FOHx RS RDUT FIN VMEASIOUT VMEASVOUT CLH CLL VCLL VCLH VFIN CONDITION OUTPUT VDUT = VFIN VDUT = VCLH VDUT = VCLL VCLH > IDUT RS 16 VCLL < IDUT RS 16 VCLH < IDUT RS 16 VCLL < IDUT RS 16 VCLH > IDUT RS 16 VCLL > IDUT RS 16 REFGNDI/V V V Figure 5. Voltage Force, Measure Current Mode Force Current In the force current mode, the voltage at FIN is now converted to a current through the following relationship: Force Current V R FIN SENSE = / Figure 6 shows a simplified diagram of the PMU when in force current mode. The control loop consists of the force amplifier with the current sense amplifier making up the feed- back path. In this case, voltage at the DUT is sensed across the voltage measure amplifier (Gain = 1) and presented at the MEASVOUT output. MEASIHx MEASIL G = 16 MEASVH MEASVL G = 1 FOHx RS RDUT FIN VMEASIOUT VMEASVOUT CLH CLL VCLL VCLH VFIN REFGNDI/V CONDITION OUTPUT IDUT = VCLH > VDUT VCLL < VDUT VFIN RS IDUT = VCLH RS IDUT = VCLL RS VCLH < VDUT VCLL < VDUT VCLH > VDUT VCLL > VDUT V V Figure 6. Current Force, Voltage Measure Mode |
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