AD5522JSVDZ datasheet(38/60 Pages) AD

tên linh kiện	AD5522JSVDZ

Giải thích chi tiết về linh kiện	Quad Parametric Measurement Unit with Integrated 16-Bit Level Setting DACs

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AD5522

Rev. A | Page 38 of 60

CIRCUIT OPERATION

FORCE VOLTAGE (FV) MODE

Most PMU measurements are performed in force voltage/measure

current (FVMI) mode, for example, when the device is used as a

device power supply, or in continuity or leakage testing. In force

voltage (FV) mode, the voltage forced is mapped directly to the

DUT. The measure voltage amplifier completes the loop, giving

negative feedback to the forcing amplifier (see Figure 51).

The forced voltage can be calculated as follows:

Forced Voltage at DUT = VOUT

VOUT = 4.5 × VREF × (DAC_CODE/216) − (3.5 × VREF ×

(OFFSET_DAC_CODE/216)) + DUTGND

where:

VOUT is the voltage of the FIN DAC (see the DAC Levels

section).

DUTGND

MEASVHx

DUT

RSENSE

(UP TO

±80mA)

RSENSE

EXTMEASIHx

FOHx

EXTFOHx

CFFx

FIN

FORCE

AMPLIFIER

EXTMEASILx

INTERNAL RANGE SELECT

(±5µA, ±20µA, ±200µA, ±2mA)

DAC

–

×5 or ×10

×1

AGND

MEASURE VOLTAGE AMPLIFIER

MEASOUTx

VMID TO

CENTER

I RANGE

×1 OR

×0.2

Ω

Figure 51. Forcing Voltage, Measuring Current

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