SI5356A datasheet(10/29 Pages) SILABS

No de pièce	SI5356A

Description	IC PROGRAMMABLE, ANY-FREQUENCY 1??00 MHZ, QUAD FREQUENCY 8-OUTPUT CLOCK GENERATOR

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Fabricant	SILABS [Silicon Laboratories]

Site Internet	http://www.silabs.com

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Si5356A

10

Rev. 1.3

3.2. Input Configuration

The Si5356 input can be driven from either an external

crystal or a reference clock. If the crystal input option is

used, the Si5356 operates as a free-running clock

generator. In this mode of operation the device requires

a low cost 25 or 27 MHz fundamental mode crystal

connected across XA and XB as shown in Figure 1.

Given the Si5356’s frequency flexibility, the same crystal

can be reused to generate any combination of output

frequencies. Custom frequency crystals are not

required. The Si5356 integrates the crystal load

capacitors on-chip to reduce external component count.

The crystal should be placed very close to the device to

minimize stray capacitance. To ensure a stable and

accurate output frequency, the recommended crystal

specifications provided in Table 4 on page 6 must be

followed. See AN360 for additional details regarding

crystal recommendations.

Figure 1. Connecting an XTAL to the Si5356

For synchronous timing applications, the Si5356 can

lock to a 5 to 200 MHz CMOS reference clock. A typical

interface circuit is shown in Figure 2. A series

termination resistor matching the driver’s output

impedance to the impedance of the transmission line is

recommended to reduce reflections.

Figure 2. Interfacing CMOS Reference Clocks

to the Si5356

Control input signals to SSC_DIS and OEB cannot

exceed 1.3 V yet also need to meet the VOH and VOL

specifications outlined in Table 2 on page 4. When

these inputs are driven from CMOS sources, a resistive

attenuator as shown in the Typical Application Circuits

must be used. Suggested standard 1% resistor values

for RSE and RSH, when using a CMOS source, are

given below.

3.3. Breakthrough MultiSynth Technology

Modern timing architectures require a wide range of

frequencies which are often non-integer related.

Traditional clock architectures address this by using a

combination of single PLL ICs, 4-PLL ICs and discrete

XOs, often at the expense of BOM complexity and

power. The Si5356 use patented MultiSynth technology

to

dramatically

simplify

timing

architectures

by

integrating the frequency synthesis capability of 4

phase-locked loops (PLLs) in a single device, greatly

minimizing size and power requirements versus

traditional solutions. Based on a fractional-N PLL, the

heart of the architecture is a low phase noise, high-

frequency VCO. The VCO supplies a high frequency

output clock to the MultiSynth block on each of the four

independent output paths. Each MultiSynth operates as

a high-speed fractional divider with Silicon Laboratories'

proprietary phase error correction to divide down the

VCO clock to the required output frequency with very

low jitter.

The first stage of the MultiSynth architecture is a

fractional-N divider which switches seamlessly between

the two closest integer divider values to produce the

exact output clock frequency with 0 ppm error. To

eliminate phase error generated by this process,

MultiSynth calculates the relative phase difference

between the clock produced by the fractional-N divider

and the desired output clock and dynamically adjusts

the phase to match the ideal clock waveform. This novel

approach makes it possible to generate any output

clock frequency without sacrificing jitter performance.

Based on this architecture, each clock output can

produce any frequency from 1 to 200 MHz.

XB

XA

XTAL

Si5356

CLKIN

50

Rs

Si5356

CMOS Level

RSE ohms

RSH ohms

1.8 V

1000

1580

2.5 V

1960

1580

3.3 V

3090

1580

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Fabricant	No de pièce	Fiches technique	Description
Silicon Laboratories	SI5355	270Kb / 22P	ANY-FREQUENCY 1??00 MHZ QUAD FREQUENCY 8-OUTPUT CLOCK GENERATOR
Silicon Laboratories	SI5356B	779Kb / 29P	I2C PROGRAMMABLE, ANY-FREQUENCY 1??00 MHZ, QUAD FREQUENCY 8-OUTPUT CLOCK GENERATOR
Skyworks Solutions Inc.	SI5356A	1Mb / 28P	I2C PROGRAMMABLE, ANY-FREQUENCY 1–200 MHZ, QUAD FREQUENCY 8-OUTPUT CLOCK GENERATOR Rev. 1.4
Skyworks Solutions Inc.	SI5355	1Mb / 22P	ANY-FREQUENCY 1–200 MHZ QUAD FREQUENCY 8-OUTPUT CLOCK GENERATOR Rev. 1.2
Silicon Laboratories	SI5338	1Mb / 46P	I2C-PROGRAMMABLE ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR
Silicon Laboratories	SI5338	715Kb / 170P	I2C-PROGRAMMABLE ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR
Skyworks Solutions Inc.	SI5338	1Mb / 46P	I2C-PROGRAMMABLE ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR Rev. 1.6
Skyworks Solutions Inc.	SI5334	1Mb / 37P	PIN-CONTROLLED ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR Rev. 1.3
Silicon Laboratories	SI5334	1Mb / 37P	PIN-CONTROLLED ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR
Silicon Laboratories	SI5335	1Mb / 47P	WEB-CUSTOMIZABLE, ANY-FREQUENCY, ANY-OUTPUT QUAD CLOCK GENERATOR/BUFFER

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