AD1941 datasheet(12/32 Pages) AD

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AD1941

Preliminary Technical Data

Rev. PrE | Page 12 of 32

VREF

Voltage Reference for Regulator. This pin is driven by an

internal 1.15 V reference voltage.

VDRIVE

Drive for External Transistor. The base of the voltage regulator’s

external PNP transistor is driven from this pin.

VSENSE

Digital power level. The voltage level on the VDD pins is sensed

on VSENSE. VSENSE should be tied to VDD.

VSUPPLY

Main Supply Voltage Level. This pin is tied to the board’s main

voltage supply. This is usually 3.3 V or 5 V.

VDD (4)

Digital VDD for Core. 2.5 V nominal.

GND (4)

Digital Ground.

PLL_VDD

Supply for AD1941 PLL. 2.5 V nominal.

PLL_GND

PLL Ground.

ODVDD (3)

VDD for All Digital Outputs. The high levels of the digital

output signals are set on this pin. The voltage can range from

2.5 V to 5.0 V.

INVDD

Peak Input Voltage Level. The highest voltage level that the

input pins will see should be connected to INVDD. This is to

protect the chip inputs from voltage overstress. The voltage on

this pin must always be at or above the level of ODVDD.

AD1941 Datasheet(PDF) 12 Page - Analog Devices