ADATE320 datasheet(53/78 Pages) AD

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Data Sheet

ADATE320

THEORY OF OPERATION

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pens when a DAC update command is written before the previous

update command finishes its deglitch and settling sequence.

Figure 129. SPI DAC Write Timing Diagram and Settling of DC Levels

DAC Levels and VTHERM Pin Transfer Function

Table 24. Detailed DAC Code to/from Voltage Level Transfer Functions

Level

Programmable Range

(0x0000 to 0xFFFF)

DAC-to-Level and Level-to-DAC Transfer Functions

VILx, VIHx, VITx/VCOMx, VOLx, VOHx, POLx,

POHx, VCHx, VCLx, PCHx, PCLx, OVDHx, OVDLx,

PPMUx (FV), PCHx (FI), PCLx (FI)

−2.5 V to +7.5 V

VDUTx = (4 × (DAC/216) − 1) × (VREF − VREFGND) + VDUTGND

DAC = ((VDUTx − VDUTGND) + (VREF − VREFGND))/(4 × (VREF −VREFGND)) × 216

IOHx, IOLx

−12.5 mA to +37.5 mA

IDUTx = (4 × (DAC/216) − 1) × (VREF − VREFGND) × (25 mA/5)

DAC = ((IDUTx × (5/25 mA)) + (VREF − VREFGND))/(4 × (VREF − VREFGND)) × 216

PPMUx (FI, Range A), PCHx and PCLx (FV, Range

−80 mA to +80 mA

IDUTx = (4 × (DAC/216) − 2) × (VREF − VREFGND) × (80 mA/5)

DAC = ((IDUTx/80 mA × 5) + 2 × (VREF − VREFGND))/(4 × (VREF − VREFGND)) × 216

PPMUx (FI, Range B), PCHx and PCLx (FV, Range

−2 mA to +2 mA

IDUTx = (4 × (DAC/216) − 2) × (VREF − VREFGND) × (2 mA/5)

DAC = ((IDUTx/2 mA × 5) + 2 × (VREF − VREFGND))/(4 × (VREF − VREFGND)) × 216

PPMUx (FI, Range C), PCHx and PCLx (FV, Range

−200 µA to +200 µA

IDUTx = (4 × (DAC/216) − 2) × (VREF − VREFGND) × (200 µA/5)

DAC = ((IDUTx/200 µA × 5) + 2 × (VREF − VREFGND))/(4 × (VREF − VREFGND)) × 216

PPMUx (FI, Range D) PCHx and PCLx (FV, Range

−20 µA to +20 µA

IDUTx = (4 × (DAC/216) − 2) × (VREF − VREFGND) × (20 µA/5)

DAC = ((IDUTx/20 µA × 5) + 2 × (VREF − VREFGND))/(4 × (VREF − VREFGND)) × 216

PPMUx (FI, Range E) PCHx and PCLx (FV, Range

−4 µA to +4 µA

IDUTx = (4 × (DAC/216) − 2) × (VREF − VREFGND) × (4 µA/5)

DAC = ((IDUTx/4 µA × 5) + 2 × (VREF − VREFGND))/(4 × (VREF − VREFGND)) × 216

Table 25. Load Transfer Functions

Load Level

Transfer Functions

Notes

IOLx

VIOLx/(2 × (VREF − VREFGND)) × 25 mA

VIOLx DAC levels are not referenced to VDUTGND

IOHx

VIOHx/(2 × (VREF − VREFGND)) × 25 mA

VIOHx DAC levels are not referenced to VDUTGND

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