Skyworks Si55 Series Manuel utilisateur

Si55xx, Si540x, and Si536x Recommended

XTAL, XO, VCXO, TCXO, and OCXO

Reference Manual

The purpose of this document is to provide a list of Crystals

(XTALs), Crystal Oscillators (XOs), Voltage Controlled Crystal Os-

cillators (VCXOs), Temperature Compensated Crystal Oscillators

(TCXOs), and Oven Controlled Crystal Oscillators (OCXOs), that

are recommended for use with Skyworks high-performance net-

work synchronizers, jitter attenuators and clock generators that

utilize fifth-generation DSPLL™ and MultiSynth™ technologies.

In this document, the Si5508/10/12/18 RF jitter attenuators and network synchronizers

will be referred to as the Si55xx product family, the Si5401/02/03 network synchronizers

will be referred to as the Si540x product family, and the Si5360/61/62/63 clock gener-

ators and jitter attenuators will be referred to as the Si536x product family. The recom-

mended references and reference frequencies for each product family are selected to

give best performance in their intended applications.

Customers should qualify any reference device using their own internal standards and

monitor specification compliance and quality of these devices over time. In circuit evalu-

ation, it is recommended to verify that the reference meets all application requirements.

See relevant device data sheets and reference manuals for external reference termina-

tion and layout recommendations. This document is purely intended to guide the selec-

tion of the reference oscillators that are paired with the Si55xx/Si540x/Si536x chipsets.

RELATED DOCUMENTS

• Si55xx Reference Manual

• Si540x Reference Manual

• Si536x Reference Manuals

• AN1293: Si55xx Schematic Design and

Layout Guidelines

• AN1347: Si540x Schematic Design and

Layout Guidelines

• AN1357: Si536x Schematic Design and

Layout Guidelines

RELATED SKYWORKS PARTS

• Si5512/18 RF Jitter Attenuator +

NetSyncTM wireline network synchronizer

clocks

• Si5510/08 RF Jitter Attenuators

•Si5401/02/03 NetSyncTM Wireline Network

Synchronizer Clocks

• Si5361/62/63 Jitter Attenuators

• Si5360 Clock Generator

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Table of Contents

1. Phase Noise References (XTALs, XOs, VCXOs) ..................3

1.1 Recommended Crystals (XTALs) ........................4

1.2 Recommended Crystal Oscillators (XOs) .....................6

1.3 Recommended Voltage-Controlled Oscillators (VCXOs) ................8

2. Stability and Holdover References (TCXOs/OCXOs) ................ 10

2.1 TCXOs ................................11

2.2 OCXOs ................................12

3. Appendix A - Selecting an XTAL for Your Application ............... 14

4. Appendix B - Selecting an XTAL Oscillator for Your Application ........... 17

5. Revision History ............................. 21

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1. Phase Noise References (XTALs, XOs, VCXOs)

Si55xx/Si540x/Si536x devices use an external quartz-based oscillator in conjunction with a high performance on-chip voltage controlled

oscillator (VCO) to generate ultra-low jitter and phase noise output clocks. This oscillator is referred to as the phase noise

reference and is required for all applications using the Si55xx/Si540x/Si536x devices. It is critical to select the proper phase noise

reference for the given device and application to optimize board design for both performance and cost. It is highly recommended to

use one of the qualified phase noise references from this document as they will result in phase noise performance in line with the data

sheet.

The Si540x wireline network synchronizers and the Si536x jitter attenuators/clock generators support either an XO or a XTAL

as the phase noise reference. The output clock jitter will be roughly equivalent between any device from the recommended list of XOs

or XTALs.

The Si55xx wireless jitter attenuators/network synchronizers support a crystal oscillator (XO), crystal (XTAL), or voltage-controlled

crystal oscillator (VCXO) as the phase noise reference. An XO is recommended for most Si55xx wireless applications. This is due

to the fact that an XO will provide the lowest close-in phase noise (10 Hz – 1 kHz). For wireless applications that are not as sensitive

to close-in phase noise either an XO or a XTAL can be used as the phase noise reference. The phase noise above a few kHz and

integrated 12 kHz-20 MHz jitter will be roughly equivalent when using any of the approved XOs/XTALs.

The Si55xx products are the only devices that support a VCXO phase noise reference. The VCXO phase noise reference is

recommended for the Si55xx devices when used in the highest performance 5G wireless applications such as mmWave

and massive MIMO. It is extremely important to select an ultra-low phase noise VCXO with a low tuning gain (Kv) like the ones

recommended in this document. A mid-tier VCXO will likely result in higher phase noise outputs clocks and a more expensive BOM cost

than using one of the recommended XOs. See the data sheet for phase noise comparisons between XO and VCXO modes.

The table below provides a summary of the supported phase noise references for each product family.

Table 1.1. Recommended Phase Noise References

Si5xxx Device Supported PN References Applications

Si5508/10/18 XO, XTAL, VCXO Wireless RU, Small Cell, Integrated Small Cell, DAS

Si5512 XO, XTAL Wireless RU, Small Cell, Integrated Small Cell, DAS, designs that

split digital and RF functions on separate board

Si5401/02/03 XO, XTAL Core/metro/access switch and routers, Wireless CU, DU and fron-

thaul switch, smart NIC

Si5361/62/63 XO, XTAL 56G/112G SerDes clocking, OTN muxponders/transponders,

switches and routers, medical imaging, test and measurement

Si5360 XO, XTAL FPGAs/processors/memory, switches and routers, OTN fram-

ers/mappers/processors, test equipment and instrumentation, broad-

cast video

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Phase Noise References (XTALs, XOs, VCXOs)

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1.1 Recommended Crystals (XTALs)

A crystal (XTAL) refers to a quartz crystal, which has the piezoelectric property that it vibrates at a fixed frequency when an electric field

is applied. The XTAL is driven by an on-chip circuit to form a crystal oscillator, which uses the mechanical resonance of the vibrating

crystal to yield a fixed frequency electrical oscillation. This provides an ultra-low jitter oscillator input to the Si55xx/Si540x/Si536x device

that is used as the phase noise reference for the phase locked loop (PLL). The allowed frequency range for the XTAL is 48-54 MHz.

The following figure shows the crystal reference connected to the XA/XB pins of the device.

Si55xx/

Si540x/

Si536x

XTAL

XA XB

Figure 1.1. Si55xx/Si540x/Si536x Clock with XTAL Phase Noise Reference on XA/XB

Table 1.2 Recommended Crystals, XTALs on page 5 lists the XTALs that are recommended for use as the phase noise reference

on the XA/XB pins of Si55xx/Si540x/Si536x devices. While it is encouraged to use one of the recommended XTALs which have been

tested and qualified, other XTALs may be used. See 3. Appendix A - Selecting an XTAL for Your Application, in particular the ESR vs

C0 requirement, will be guaranteed to oscillate.

XTALs that meet the specifications outlined in this document may be submitted to Skworks for future qualification consideration for

use with the clocks listed above. Some of the part numbers in this table are custom generated for Skworks. Part Family information is

included in the table to enable searching through vendor websites. Users can also contact the vendor directly and ask for the specific

part number listed. The oscillation frequency vs temperature curve of the XTALS specified will have a shape of an S-curve. However,

there can be small deviations from the S-curve primarily due to imperfect internal connections to the actual physical XTAL blank. These

deviations are called Frequency Perturbations. In some applications, it is important that the Frequency Perturbation be limited to a

maximum value. Some XTALS specify a maximum for Frequency Perturbations and others do not. It is recommended that an XTAL

have a max Frequency Perturbations spec of no more than 2 ppm/2 °C. This means that over a 2 °C temperature range that the XTAL

frequency will not change by more than 2 ppm from the normal S-curve shape.

The figures in this document are meant to be high level. For example, design details like the XTAL ground shield (XV) are not shown

in the figure above. See the appropriate product reference manual and Si55xx/Si540x/Si536x Schematic Design and Layout Guidelines

Application Note for more detailed XTAL connections and layout recommendations.

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Phase Noise References (XTALs, XOs, VCXOs)

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Table 1.2. Recommended Crystals, XTALs

Supplier Part Number

Freq

(MH

Initial

Toler-

ance

(±ppm)

Operating

Temp (C)

Freq

Error

over

Operat-

ing

Temp

Range

(±ppm)

Max

(pF)

ESR

Max

(ohms)

(pF)

Pullability

max1 (ppm/pf) Qmin

Activity

Dip

Guar-

anteed

2ppm/C

max?

Drive Lev-

el max

(µW)

Pack-

age

Size

(mm)

TXC 7M48072009 48 10 –40 to 105 20 2.0 22 8.0 35 30k Yes 200 3.2 x

2.5

TXC 7M54072006 54 10 –40 to 105 20 2.0 22 8.0 35 30k Yes 200 3.2 x

2.5

Kyocera CX3225SB48000

D0FRRC1

48 10 –40 to 105 40 2.0 25 8.0 35 — Yes 200 3.2 x

2.5

Kyocera CX3225SB54000

D0FRRC1

54 10 –40 to 105 40 2.0 25 8.0 35 — Yes 200 3.2 x

2.5

Taitien S0242-X-004-3 48 15 –40 to 105 35 2.0 25 8.0 35 30k Yes 200 3.2 x

2.5

Taitien S0242-X-005-3 54 10 –40 to 105 45 2.0 30 8.0 35 30k Yes 200 3.2 x

2.5

Note:

1. Pullability is the change is oscillation frequency when CL is not exactly 8 pf.

Xtal Vendor contact information

TXC

www.txccorp.com

USA office phone number 714-990-5510

Kyocera

https://global.kyocera.com/prdct/electro/

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Phase Noise References (XTALs, XOs, VCXOs)

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1.2 Recommended Crystal Oscillators (XOs)

Some applications, in particular RF/wireless clocking (Si55xx), are sensitive to close-in phase noise. For these applications, a crystal

oscillator (XO) is recommended as the phase noise reference. Some customers also tend to use an XO instead of a XTAL for

its superior reliability and performance over temperature. The recommended frequency range for the XO is 48-54 MHz for best

performance although a wider range of XO frequencies is supported as specified in the device data sheet.

Compared to a discrete XTAL, an XO will have less total frequency error when taking into account all factors. Using an XO instead of a

XTAL will:

• Produce output clocks with lower phase noise for offsets less than 1 kHz.

• Deliver greater immunity to vibration and airflow effects. This may result in lower phase noise below ~50 Hz.

• Deliver better temperature stability with the frequency changes of an XO being less than that of a XTAL. Because of this, a jitter

attenuator device can have a lower bandwidth and still filter out these oscillation frequency changes.

• Deliver better accuracy in free-run since the accuracy of an XO is far better than that of a XTAL.

The jitter of the XO applied to the Si55xx/Si540x/Si536x device has a large effect on the output jitter/phase noise for offset frequencies

up to ~1.5 MHz. The following figure shows the XO phase noise reference connected to the clock. Note the distinction that XOs should

be connected to the REF_IN pins for Si55xx devices and the XO_IN for Si540x/Si536x devices whereas XTALs are always connected

to the XA/XB pins. The REF_IN/XO_IN can support a DC coupled single-ended CMOS XO input or an AC coupled differential XO input

to REF_IN/XO_IN and REF_INB/XO_INB. In general, single ended CMOS XO inputs are far more common for the recommended XO

frequency range as they can achieve lower phase noise floor with respect to differential XOs.

Si55xx

REF_IN

Si540x/

Si536x

XO_IN

Figure 1.2. Si55xx/Si540x/Si536x Clocks with XO Phase Noise Reference on REF_IN Input

The figures in this document are meant to be high level. See the appropriate product reference manual and Si55xx/Si540x/Si536x

Schematic Design and Layout Guidelines Application Note for XO input connections and specification limits, rise/fall times, input

circuits, input level specifications, and performance tradeoffs. Also, see the design/layout guideline application notes for how to power

XOs.

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Phase Noise References (XTALs, XOs, VCXOs)

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The table below lists the XOs that are recommended for use as the phase noise reference of the Si55xx/Si530x/Si536x devices.

To deliver optimum performance, either these recommended XOs or one of equivalent phase noise and jitter performance must be

selected.

Note: Some of the part numbers in this table are custom generated for Skyworks. Part Family information is included in the

table to enable searching through vendor websites. Users can also contact the vendor directly and ask for the specific part

number listed.

Table 1.3. Recommended XO Phase Noise References

Supplier Part Number Part

Family

Freq

(MHz) Temp °C

Total

Frequency

Stability

(±ppm)1

Supply

Voltage2

Package

Size (mm) Notes

NDK NZ2520SDA-48M-

CUS5242A NZ2520SDA 48 –40 to 105 50 3.3 V 2.5 x 2.0 3

TXC 7X48070007 7X 48 –40 to 105 50 3.3 V 3.2 x 2.5 3

TXC 8W48070009 8W 48 –40 to 85 25 3.3 V, 1.8 V 2.5 x 2.0 3

NDK NZ2520SDA-54M-

CUS5094C NZ2520SDA 54 –40 to 105 50 3.3 V 2.5 x 2.0 3, 4

TXC 7X54070001 7X 54 –40 to 105 50 3.3 V 3.2 x 2.5 3, 4

TXC 7X54070002 7X 54 –40 to 105 50 1.8 V 3.2 x 2.5 3, 4

TXC 8W54070002 8W 54 –40 to 105 50 3.3 V 2.5 x 2.0 3, 4

TXC 8W54070004 8W 54 –40 to 85 25 3.3 V, 1.8 V 2.5 x 2.0 3, 4

Note:

1. Includes initial accuracy, temperature, aging, and soldering effects.

2. 1.8 V supply voltage should only be used for low-power mode applications in which VDDRED = VDDA = 1.8 V.

3. Recommended for use on Si540x (Si5401/02/03) and Si536x (Si5360/61/62/63) devices.

4. Recommended for use on Si55xx (Si5508/10/12/18) devices.

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Phase Noise References (XTALs, XOs, VCXOs)

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1.3 Recommended Voltage-Controlled Oscillators (VCXOs)

The Si5508/10/18 devices support a voltage-controlled crystal oscillator (VCXO) phase noise reference. Note the Si5512 is the only

device in the Si55xx product family which does not support a VCXO phase noise reference. Even though for most wireless 5G

applications the Si55xx + XO phase noise reference is sufficient in some high end RF applications like mmWave and massive MIMO,

a VCXO may be advantageous due to the slightly lower mid-band phase noise and RMS jitter. The recommended VCXOs in the table

below have ultra-low phase noise floor along with a low tuning gain (Kv) which is critical for achieving low close-in phase noise with a

VCXO often required for wireless applications. It is extremely critical to use a VCXO from Table 1.3 below or one of equal performance.

If a customer selects a VCXO that is not on the recommended listed in this document, the Si55xx output phase noise will

likely be WORSE than using a recommended XO. A mid-tier VCXO will likely result in higher phase noise outputs clocks and a more

expensive BOM cost than using one of the recommended XOs. See the Si55xx data sheets for phase noise comparisons between XO

and VCXO modes.

One key distinction between an XO/XTAL and a VCXO phase noise reference is that the VCXO frequency is steered by the voltage

control (VC) output from the on-chip high resolution DAC compared to a free-running XTAL/XO phase noise reference in which the

PLL output frequency is steered internally by an on-chip high resolution digital divider. Because the VCXO frequency matches the

desired output frequency, VCXO buffer mode outputs are supported. The buffered copy of the VCXO can provide the lowest midband

phase noise output clock (1k-1M) to meet the most stringent phase noise masks for output clocks providing synchronization to radio

equipment such as an RF LO, phased-array antenna or high performance ADC/DAC.

The Si5508/10/18 devices support both DC coupled single ended CMOS and AC coupled differential VCXOs. It is recommended to use

a VCXO with a frequency greater than or equal to 122.88 MHz. The desired high performance RF clock output frequency should be

integer related to the VCXO frequency. The figures in this document are meant to be high level. See the appropriate Product reference

manual for input connections and terminations.

Si5508/

10/18

REF_IN

VCXO

Figure 1.3. Si5508/10/18 Clock with VCXO Phase Noise Reference on REF_IN Input

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Phase Noise References (XTALs, XOs, VCXOs)

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Table 1.4. Recommended VCXO Phase Noise References for Si5508/10/18 Devices1

Supplier Part Number Part Family Freq (MHz) Temp °C Package Size

(mm)

Absolute Pull

Range, APR

(±ppm)

Rakon V41042RVX1490U 122.88 –40 to 85 9 x 14 5

Rakon V4185 RVX1490U 122.88 –40 to 95 9 x 14 10

Rakon V4173 RVX1490U 153.6 –40 to 85 9 x 14 5

Epson H20-065-0A VG3225EFN 204.8 –40 to 85 3.2 x 2.5 20

Epson CJGHSA VG332EFN 491.52 –40 to 85 3.2 x 2.5 10

TXC CJB0470001 204.8 –40 to 85 3.2 x 5 50

TXC DRA5370001 153.6 –40 to 85 3.2 x 5 5

Note:

1. Includes initial calibration, temperature range, aging, soldering effects, and supply-and-load variation.

2. V4104 is not recommended for new designs. For new designs, use V4185.

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Phase Noise References (XTALs, XOs, VCXOs)

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2. Stability and Holdover References (TCXOs/OCXOs)

Network synchronization applications, such as IEEE-1588 and Synchronous Ethernet ITU-T G.8262/G.8262.1 (SyncE), require low

wander in addition to the traditional low jitter/phase noise requirement. A compensated crystal oscillator such as a TCXO or OCXO is

required to provide stability to support the low bandwidths specified for SyncE PLLs (0.1-10 Hz BW) and/or IEEE-1588 servo loops

(1-100 mHz BW). For SyncE and/or full timing support (FTS) applications as described in ITU-T G.8275.1 a TCXO is recommended.

For applications that require PLL or servo loop bandwidths less than 100 mHz or for applications that require SyncE and/or time

holdover an OCXO is recommended. This includes 1PPS (Pulse Per Second)/PP2S (Pulse Per 2 Seconds) PLLs, which are commonly

required to lock to GNSS receivers for partial/assisted partial timing support (PTS/APTS) applications as described in ITU-T G.8275.2.

See Sections 2.1 and 2.2 for more details on selecting the right quality oscillator for a given application.

The Si540x and Si5512/18 network synchronizer devices support these applications using two reference oscillators in dual reference

mode. In this mode, the phase noise reference is applied to the device in the same manner as described in Section 1 (for example to

the XA/XB pins when using a XTAL) along with a second TCXO/OCXO reference for stability and optional holdover. The TCXO/OCXO

is applied to the input pins (INx) in the case of the Si5512/18 and the dedicated REF pin in the case of the Si540x. The Si540x require

dual reference mode while the Si5512/18 can support either dual or single reference modes configurable in ClockBuilder Pro. The

Si536x and Si5508/10 do not support dual reference mode.

Note: See the applicable Skyworks product Reference Manual for rise/fall time, input circuits, input level specifications and perform-

ance tradeoffs.

Si540x

XTAL

XA XB

OCXO/

TCXO

REF

Figure 2.1. Si540x Network Synchronizer with OCXO/TCXO and XTAL Reference

Si5512/18

OCXO/

TCXO

INx

REF_IN

Figure 2.2. Si5512/18 RF JA + Network Synchronizer with OCXO/TCXO and XO Reference

Si55xx, Si540x, and Si536x Recommended XTAL, XO, VCXO, TCXO, and OCXO Reference Manual • Stability and Holdover References (TCXOs/

OCXOs)

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