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SiT3372

1 MHz to 220 MHz Ultra-low Jitter Differential VCXO

Description

The

SiT3372

is a 1 MHz to 220 MHz differential MEMS

VCXO engineered for low-jitter applications. Utilizing

SiTime’s unique DualMEMS

temperature sensing and

TurboCompensation

technology, the SiT3372 delivers

exceptional dynamic performance by providing

resistance to airflow, thermal gradients, shock and

vibration. This device also integrates multiple on-chip

regulators to filter power supply noise, eliminating the

need for a dedicated external LDO.

The SiT3372 can be factory programmed for any

combination of frequency, stability, voltage, output

signaling, and pull range. Programmability enables

designers to optimize clock configurations while

eliminating long lead times and customization costs

associated with quartz devices where each frequency is

custom built.

The wide frequency range and programmability makes

this device ideal for telecom, networking, and industrial

applications that require a variety of pullable frequencies

and operate in noisy environments.

Refer to

Manufacturing Notes

for proper reflow profile,

tape and reel dimension, and other manufacturing

related information.

Features

◼

Any frequency between 1 MHz and 220 MHz accurate

to 6 decimal places

(For frequencies 220.000001 MHz to 725 MHz, refer

SiT3373)

Widest pull range options: ±25, ±50, ±80, ±100, ±150,

±200, ±400, ±800, ±1600, ±3200 ppm

0.225 ps RMS phase jitter (typ) over 12 kHz to 20 MHz

bandwidth

Frequency stability as low as

±15

ppm

Wide temperature range support from -40°C to 105°C

Industry-standard packages: 7.0 x 5.0 mm,

5.0 x 3.2 mm, 3.2 x 2.5 mm packages

Applications

◼

Cable Modem Termination System (CMTS), Video,

Broadcasting System, Audio, Industrial Sensors,

Remote Radio Head (RRH)

SATA, SAS, 10/40/100/400 Gbps Ethernet, Fibre Channel,

PCI-Express

Block Diagram

3.2 x 2.5 mm Package Pinout

VIN

GND

VDD

OUT-

OUT+

Figure 1. SiT3372 Block Diagram

Figure 2. Pin Assignments (Top view)

(Refer to

Table 6

for Pin Descriptions)

Rev 1.07

20 July 2021

www.sitime.com

SiT3372

1 MHz to 220 MHz Ultra-low Jitter Differential VCXO

Ordering Information

SiT3372AC -1B2-33NH122.123456T

Part Family

“SiT3372”

Packaging

“T”, “Y”, “D” or “E”

Refer to table below for packing method

[1]

Leave Blank for Bulk

Revision Letter

“A” is the revision of Silicon

Frequency

1.000000 MHz to 220.000000 MHz

Temperature Range

“C”: Extended Commercial, -20 to 70°C

“ I ” : Industrial, -40 to 85°C

“B”: -40 to 95°C

“E”: Extended Industrial, -40 to 105°C

Pull Range Options

“M”: ±25 ppm

“B”: ±50 ppm

“C”: ±80 ppm

“E”: ±100 ppm

“G”: ±150 ppm

“H”: ±200 ppm

“X”: ±400 ppm

“Y”: ±800 ppm

“Z”: ±1600 ppm

“U”: ±3200 ppm

[2]

Signalling Type

“1”: LVPECL

“2”: LVDS

“4”: HCSL

Package Size

“B”: 3.2 x 2.5 mm

“C”: 5.0 x 3.2 mm with center pad

“E”: 7.0 x 5.0 mm with center pad

Feature Pin

[3]

“N”: No Connect

“E”: Output Enable

Frequency Stability

“H”:

“2”:

“9”:

“3”:

±15 ppm

±25 ppm

±35 ppm

±50 ppm

Voltage Supply

“25”: 2.5 V ±10%

“28”: 2.8 V ±10%

“30”: 3.0 V ±10%

“33”: 3.3 V ±10%

Notes:

1. Bulk is available for sampling only.

Contact SiTime

for custom pull range options.

3. “E”: Output Enable function is only available in 7.0 x 5.0 mm and 5.0 x 3.2 mm packages.

Table 1. Ordering Codes for Supported Tape & Reel Packing Method

Device Size

(mm x mm)

7.0 x 5.0

5.0 x 3.2

3.2 x 2.5

8 mm T&R

(3ku)

–

8 mm T&R

(1ku)

–

12 mm T&R

(3ku)

–

12 mm T&R

(1ku)

–

16 mm T&R

(3ku)

–

16 mm T&R

(1ku)

–

Rev 1.07

Page 2 of 17

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SiT3372

1 MHz to 220 MHz Ultra-low Jitter Differential VCXO

TABLE OF CONTENTS

Description ................................................................................................................................................................................... 1

Features....................................................................................................................................................................................... 1

Applications ................................................................................................................................................................................. 1

Block Diagram ............................................................................................................................................................................. 1

Ordering Information .................................................................................................................................................................... 2

Electrical Characteristics.............................................................................................................................................................. 4

Waveform Diagrams .................................................................................................................................................................. 10

Timing Diagrams ........................................................................................................................................................................ 11

Termination Diagrams................................................................................................................................................................ 12

LVPECL .............................................................................................................................................................................. 12

LVDS .................................................................................................................................................................................. 13

HCSL .................................................................................................................................................................................. 13

Dimensions and Patterns ― 3.2 x 2.5 mm................................................................................................................................. 14

Dimensions and Patterns ― 5.0 x 3.2 mm................................................................................................................................. 14

Dimensions and Patterns ― 7.0 x 5.0 mm................................................................................................................................. 15

Additional Information ................................................................................................................................................................ 16

Revision History ......................................................................................................................................................................... 17

Rev 1.07

Page 3 of 17

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SiT3372

1 MHz to 220 MHz Ultra-low Jitter Differential VCXO

Electrical Characteristics

Table 2. Electrical Characteristics – Common to LVPECL, LVDS and HCSL

All Min and Max limits in the Electrical Characteristics tables are specified over temperature and rated operating voltage with standard

output termination shown in the termination diagrams. Typical values are at 25°C and nominal supply voltage.

Parameter

Output Frequency Range

Frequency Stability

Symbol

F_stab

Min.

-15

-25

-35

-50

Operating Temperature Range

T_use

-20

-40

Supply Voltage

Vdd

2.97

2.7

2.52

2.25

Pull Range

Typ.

–

3.3

3.0

2.8

2.5

Max.

220

+15

+25

+35

+50

+70

+85

+95

+105

3.63

3.3

3.08

2.75

Unit

MHz

ppm

°C

ppm

See the APR (Absolute Pull Range)

Table 11.

Contact SiTime

for custom pull range options

Voltage at which maximum frequency deviation is guaranteed

Voltage at which minimum frequency deviation is guaranteed

Contact SiTime

for other input bandwidth options

Extended Industrial

Extended Commercial

Industrial

Condition

Accurate to 6 decimal places

Inclusive of initial tolerance, operating temperature, rated power

supply voltage, load variations, and first year aging at 25

°C,

with VIN voltage at Vdd/2.

±15

ppm is only guaranteed for pull range up to

±100

ppm.

Frequency Range

Frequency Stability

Temperature Range

Supply Voltage

Voltage Control Characteristics

±25, ±50, ±80, ±100, ±150,

±200, ±400, ±800, ±1600,

±3200

90%

–

10%

–

1.0

–

Input Characteristics

Input Voltage High

Input Voltage Low

Input Pull-up Impedance

Duty Cycle

Startup Time

OE Enable/Disable Time

VIH

VIL

Z_in

T_start

T_oe

70%

–

100

–

30%

3.0

3.8

Vdd

kΩ

µs

Measured from the time Vdd reaches its rated minimum value

f = 156.25 MHz. Measured from the time OE pin reaches

rated VIH and VIL to the time clock pins reach 90% of swing

and high-Z. See

Figure 9

and

Figure 10

Pin 2, OE

Pin 2, OE logic high or logic low

Upper Control Voltage

Lower Control Voltage

Control Voltage Input Impedance

Control Voltage Input Bandwidth

Pull Range Linearity

Frequency Change Polarity

VC_U

VC_L

VC_z

V_c

Lin

–

Vdd

MΩ

kHz

Positive Slope

Output Characteristics

Startup and OE Timing

Rev 1.07

Page 4 of 17

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SiT3372

1 MHz to 220 MHz Ultra-low Jitter Differential VCXO

Table 3. Electrical Characteristics – LVPECL Specific

Parameter

Current Consumption

OE Disable Supply Current

Output Disable Leakage Current

Maximum Output Current

Output High Voltage

Output Low Voltage

Output Differential Voltage Swing

Rise/Fall Time

RMS Period Jitter

[4]

RMS Phase Jitter (random)

Symbol

Idd

I_OE

I_leak

I_driver

VOH

VOL

V_Swing

Tr, Tf

T_jitt

T_phj

Min.

–

Vdd-1.15

Vdd-2.0

1.2

–

Typ.

0.15

–

1.6

225

1.0

0.225

Max.

–

Vdd-0.7

Vdd-1.5

2.0

290

1.6

0.270

Unit

A

Condition

Excluding Load Termination Current, Vdd = 3.3 V or 2.5 V

OE = Low

Maximum average current drawn from OUT+ or OUT-

See

Figure 5

See

Figure 5

See

Figure 6

20% to 80%, see

Figure 6

f = 100, 156.25 or 212.5 MHz, Vdd = 3.3 V or 2.5 V

f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz, all

Vdd levels, includes spurs, pull range =

±100

ppm. Temperature

ranges -20 to 70°C and -40 to 85°C

f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz, all

Vdd levels, includes spurs, pull range =

±100

ppm. Temperature

ranges -40 to 95°C and -40 to 105°C

f = 156.25 MHz, IEEE802.3-2005 10 GbE jitter mask integration

bandwidth = 1.875 MHz to 20 MHz, includes spurs, all Vdd

levels

f = 100, 156.25 or 212.5 MHz, Vdd = 3.3 V or 2.5 V

f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz, all

Vdd levels, includes spurs, pull range =

±100

ppm. Temperature

ranges -20 to 70°C and -40 to 85°C

f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz, all

Vdd levels, includes spurs, pull range =

±100

ppm. Temperature

ranges -40 to 95°C and -40 to 105°C

f = 156.25 MHz, IEEE802.3-2005 10 GbE jitter mask integration

bandwidth = 1.875 MHz to 20 MHz, includes spurs, all

Vdd levels

Current Consumption

Output Characteristics

Jitter – 7.0 x 5.0 mm package

–

0.225

0.300

–

0.1

–

Jitter – 5.0 x 3.2 mm and 3.2 x 2.5 mm package

RMS Period

Jitter

[4]

T_jitt

T_phj

–

1.0

0.225

1.6

0.275

RMS Phase Jitter (random)

–

0.225

0.340

–

0.1

–

Notes:

4. Measured according to JESD65B.

Rev 1.07

Page 5 of 17

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