CAT5271, CAT5273

http://onsemi.com

8

D (Dec.)

Output State

255

441

Full Scale

128

50,050

Midscale

1

99,659

1 LSB

0

100,050

Zero Scale

Typical device to device resistance matching is lot

dependent and may vary by up to 20%.

ESD Protection

GND

LOGIC

Digital

Input

GND

Potentiometer

Figure 15. ESD Protection Networks

W, A, B

Terminal Voltage Operating Range

define the limits for proper 3-terminal digital potentiometer

operation. Signals or potentials applied to terminals A, B or

Signals which attempt to go outside these boundaries will be

clamped by the internal forward biased diodes.

W, A, B

CAT5271

LOGIC

GND

Figure 16.

Power-up Sequence

Because ESD protection diodes limit the voltage

compliance at terminals A, B, and W (see Figure 15), it is

any voltage to terminals A, B, and W. The ideal power-up

Power Supply Bypassing

Good design practice employs compact, minimum lead

length layout design. Leads should be as direct as possible.

It is also recommended to bypass the power supplies with

quality low ESR Ceramic chip capacitors of 0.01

mF to

0.1

mF. Low ESR 1 mF to 10 mF tantalum or electrolytic

capacitors can also be applied at the supplies to suppress

transient disturbances and low frequency ripple. As a further

precaution digital ground should be joined remotely to the

analog ground at one point to minimize the ground bounce.

CAT5271

GND

+

10 mF

0.1 mF

Figure 17. Power Supply Bypassing