LM9832 datasheet(4/42 Pages) NSC

4 / 42 page

www.national.com

Miscellaneous

RESET

Digital input. Take high to force device into

Power On Reset state, low to exit reset state.

TEST

Analog Output.

CMODE

Digital Input. Test mode, always tie high.

Analog Power Supplies (4 pins)

VA (2)

This is the positive supply pin for the analog

supply. It should be connected to a voltage

source of +5V and bypassed to AGND with a

0.1µF monolithic capacitor in parallel with a

10µF tantalum capacitor.

AGND (2)

This is the ground return for the analog sup-

ply.

Digital Power Supplies (17 pins)

VD (5)

This is the positive supply pin for the digital

supply. It should be connected to a voltage

source of +5V and bypassed to DGND with a

0.1µF monolithic capacitor.

VDRAM(3)

This is the positive supply pin for the digital

supply for the LM9832’s external DRAM I/O. It

also powers the A, B, A, and B stepper motor

outputs. It should be connected to a 3 or 5V

supply and bypassed to the closest DGND pin

with a 0.1µF monolithic capacitor.

DGND (9)

This is the ground return for VD and VDRAM.

Pin Descriptions (Continued)

LM9832 Datasheet(PDF) 4 Page - National Semiconductor (TI)