549AAAA000112ABGR datasheet, PDF

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549AAAA000112ABGR: DescriptionProgrammable Oscillators I2C Programmable XO; CategoryPassive components; File Size954KB，33 Pages; ManufacturerSilicon Laboratories

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549AAAA000112ABGR Overview

Programmable Oscillators I2C Programmable XO

549AAAA000112ABGR Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	Silicon Laboratories
Product Category	Programmable Oscillators
Frequency	0.2 MHz to 1500 MHz
Frequency Stability	50 PPM
Load Capacitance	5 pF
Operating Supply Voltage	2.5 V, 3.3 V
Supply Voltage - Min	2.375 V
Supply Voltage - Max	3.465 V
Output Format	LVPECL
Product	XO
Termination Style	SMD/SMT
Package / Case	5 mm x 7 mm
Minimum Operating Temperature	- 40 C
Maximum Operating Temperature	+ 85 C
Length	7 mm
Width	5 mm
Height	1.18 mm
Current Rating	107 mA
Type	I2C Programmable
Duty Cycle - Max	55 %
Mounting Style	SMD/SMT

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Ultra Series

™

Crystal Oscillator

Si549 Data Sheet

Ultra Low Jitter I2C Programmable XO (95 fs), 0.2 to 1500 MHz

The Si549 Ultra Series

™

oscillator utilizes Silicon Laboratories’ advanced 4

generation DSPLL

technology to provide an ultra-low jitter, low phase noise

clock at any output frequency. The device is user-programmed via simple

I2C commands to provide any frequency from 0.2 to 1500 MHz with <1 ppb

resolution and maintains exceptionally low jitter for both integer and fraction-

al frequencies across its operating range. The Si549 offers excellent reliabili-

ty and frequency stability as well as guaranteed aging performance. On-chip

power supply filtering provides industry-leading power supply noise rejection,

simplifying the task of generating low jitter clocks in noisy systems that use

switched-mode power supplies. The Si549 has a dramatically simplified sup-

ply chain that enables Silicon Labs to ship custom frequency samples 1-2

weeks after receipt of order. Unlike a traditional XO, where a different crystal

is required for each output frequency, the Si549 uses one simple crystal and

a DSPLL IC-based approach to provide the desired output frequency. The

Si549 is factory-configurable for a wide variety of user specifications, includ-

ing startup frequency, I2C address, output format, and OE pin location/

polarity. Specific configurations are factory-programmed at time of shipment,

eliminating the long lead times associated with custom oscillators.

Pin Assignments

SDA

OE/FS/NC

VDD

KEY FEATURES

• I2C programmable to any frequency from 0.2 to

1500 MHz with < 1 ppb resolution

• Ultra low jitter: 95 fs Typ RMS (12 kHz – 20 MHz)

• Configure up to 4 pin-selectable startup frequencies

• I2C interface supports 100 kbps, 400 kbps, and 1

Mbps (Fast Mode Plus)

• Excellent PSRR and supply noise immunity: –80

dBc Typ

• 3.3 V, 2.5 V and 1.8 V V

supply operation from

the same part number

• LVPECL, LVDS, CML, HCSL, CMOS, and Dual

CMOS output options

• 3.2x5, 5x7 mm package footprints

• Samples available with 1-2 week lead times

APPLICATIONS

• 100G/200G/400G OTN, coherent optics, PAM4

• 10G/40G/100G optical ethernet

• 3G-SDI/12G-SDI/24G-SDI broadcast video

• Servers, switches, storage, search acceleration

• Test and measurement

• FPGA/ASIC clocking

NC/OE/FS

GND

SCL

(Top View)

CLK–

CLK+

Pin #

1, 2

Descriptions

Selectable via ordering option

OE = Output enable; FS = Frequency Select; NC = No connect

GND = Ground

CLK+ = Clock output

CLK- = Complementary clock output. Not used for CMOS.

VDD = Power supply

SDA = I2C Serial Data

SCL = I2C Serial Clock

NVM

Control

OSC

Fixed

Frequency

Crystal

Frequency

Flexible

DSPLL

DCO

Low

Noise

Driver

Digital

Phase

Detector

Phase Error

Cancellation

Phase Error

Fractional

Divider

Digital

Loop

Filter

Flexible

Formats,

1.8V – 3.3V

Operation

Power Supply Regulation

OE, Frequency Select

(I2C and Pin Control)

Built-in Power Supply

Noise Rejection

silabs.com

| Building a more connected world.

Rev. 0.75

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