GS3281 datasheet(8/97 Pages) SEMTECH

8 / 97 page

GS3281

Final Data Sheet

Rev.7

PDS-061453

January 2019

8 of 97

Semtech

Proprietary & Confidential

www.semtech.com

GPIO2

Digital

Input/Output

Multi-function Control/Status Input/Output 2.

Default function:

Direction = Input



Signal = Set HIGH to put device in sleep

Pin is 1.8V CMOS I/O, please refer to GPIO2_CFG for more information

on how to configure GPIO2.

VCO_FILT

Passive

VCO filter capacitor connection. Decouple to ground. See Section 6.1

Typical Application Circuit for values.

VCC_CORE

Power

Most positive power supply connection for the analog core.

Connect to 1.8V and decouple to ground. See Section 6.1 Typical

Application Circuit for values.

GPIO3

Digital

Input/Output

Multi-function Control/Status Input/Output 3.

Default function:

Direction = Input



Signal = Set HIGH to disable SDO1/SDO1

Pin is 1.8V CMOS I/O, please refer to GPIO3_CFG for more information

on how to configure GPIO3.

LF+

Passive

Loop filter capacitor connection. Connect to pin 40 through capacitor.

See Section 6.1 Typical Application Circuit for values.

LF-

Passive

Loop filter capacitor connection. Connect to pin 39 through capacitor.

See Section 6.1 Typical Application Circuit for values.

Tab

—

Central paddle can be connected to ground or left unconnected. Its

purpose is to provide increased mechanical stability. It is not required

for thermal dissipation. It is not commended to connect device

ground pins to the central paddle.

Table 1-1: GS3281 Pin Descriptions (Continued)

Pin Number

Name

Type

Description

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