GS3281 datasheet(13/97 Pages) SEMTECH

13 / 97 page

GS3281

Final Data Sheet

Rev.7

PDS-061453

January 2019

13 of 97

Semtech

Proprietary & Confidential

www.semtech.com

PLL Loop Bandwidth

BWLOOP(125Mb/s)

Setting 0.0625x

—

kHz

Setting 0.125x

—

kHz

Setting 0.25x

—

kHz

Setting 0.5x (Default)

—

kHz

Setting 1.0x

—

150

—

kHz

BWLOOP(270Mb/s)

Setting 0.0625x

—

kHz

Setting 0.125x

—

kHz

Setting 0.25x

—

kHz

Setting 0.5x

—

160

—

kHz

Setting 1.0x (Default)

—

316

—

kHz

BWLOOP(1.485Gb/s)

Setting 0.0625x

—

110

—

kHz

Setting 0.125x

—

220

—

kHz

Setting 0.25x

—

440

—

kHz

Setting 0.5x (Default)

—

876

—

kHz

Setting 1.0x

—

1750

—

kHz

BWLOOP(2.97Gb/s)

Setting 0.0625x

—

220

—

kHz

Setting 0.125x

—

440

—

kHz

Setting 0.25x

—

880

—

kHz

Setting 0.5x (Default)

—

1.76

—

MHz

Setting 1.0x

—

3.5

—

MHz

Notes:

1. Values achieved with Semtech evaluation board and connector.

2. Measured using a clean input source.

3. Default driver swing Setting.

4. Please see PLL_LOOP_ BANDWIDTH_ 1 for the full range of loop bandwidth settings.

5. Please see Section 4.3.3.1for the further definition on Synchronous and Asynchronous Lock Time.

6. This specification applies to SDO0/SDO0 and SDO1/SDO1.

7. Trace insertion loss was measured with FR4 material using 7 mil stripline traces using a PRBS23 signal.

8. Measured under minimal trace loss conditions.

9. Stated minimum and maximum voltages represent voltage levels at input pins.

Table 2-3: AC Electrical Characteristics (Continued)

VCC_DDI, VCC_CORE, VDD = 1.8V ±5% and VCCO_0, VCCO_1 = +2.5/3.3V ±5%, TA = -40°C to +85°C, unless otherwise shown.

Parameter

Symbol

Conditions

Min

Typ

Max

Units

Notes

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