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SiT3542

340 to 725 MHz Endura™ Series I

C/SPI Programmable Oscillator

Features

◼

Description

The

SiT3542

is a ruggedized, ultra-low jitter, user

programmable oscillator with a maximum acceleration

sensitivity of 0.1 ppb/g. SiT3542, designed for high reliability

applications, offers the system designer great flexibility and

functionality in the most demanding environments.

The device supports two in-system programming options

after powering up at a default, factory programmed startup

frequency:

◼

0.1 ppb/g acceleration sensitivity for harsh environments

Programmable frequencies (factory or via I

C/SPI)

from 340.000001 MHz to 725 MHz

Digital frequency pulling (DCO) via I

C/SPI

▪

Output frequency pulling with perfect pull linearity

▪

13 programmable pull range options to

±3200

ppm

▪

Frequency pull resolution as low as 5 ppt (0.005 ppb)

0.21 ps typical integrated phase jitter (12 kHz to 20 MHz)

Integrated LDO for on-chip power supply noise filtering

0.02 ps/mV PSNR

-40°C to 105°C operating temperature

LVPECL, LVDS, or HCSL outputs

▪

Programmable LVPECL, LVDS Swing

▪

LVDS Common Mode Voltage Control

RoHS and REACH compliant, Pb-free, Halogen-free

and Antimony-free

◼

Any-frequency mode where the clock output can be re-

programmed to any frequency between 340 MHz and

725 MHz in 1 Hz steps

Digitally controlled oscillator (DCO) mode where the

clock output can be steered or pulled by up to

±3200

ppm with 5 to 94 ppt (parts per trillion) resolution.

◼

A user specifies the device’s default start-up frequency in

the ordering code. User programming of the device is

achieved via I

C or SPI. Up to 16 I

C addresses can be

specified by the user either as a factory programmable

option or via hardware pins, enabling the device to share

the I

C with other I

C devices.

The SiT3542 utilizes SiTime’s unique DualMEMS™

temperature sensing and TurboCompensation™ technology

to deliver exceptional dynamic performance

◼

Applications

◼

Land Mobile Communications

Avionics

Airframe / Engine Management Control

Satellite Base Stations

Resistant to airflow and thermal shock

Resistant to shock and vibration

Superior power supply noise rejection

Block Diagram

Package Pinout

(10-Lead QFN, 5.0 x 3.2 mm)

A/ K

SD C L

OE / NC

GND

VDD

OUT-

OUT+

A1 A0

/N /N

C/ C/

M SS

Figure 1. SiT3542 Block Diagram

Figure 2. Pin Assignments (Top view)

(Refer to

Table 14

for Pin Descriptions)

Rev 1.00

July 24, 2020

www.sitime.com

SiT3542

340 to 725 MHz Endura™ Series I

C/SPI Programmable Oscillator

Ordering Information

SiT3542 AC A1C133 1 GG622.080000T

Part Family

“SiT3542”

[2]

Revision Letter

“A” is the revision of Silicon

Frequency

Temperature Range

[1]

“I” : Industrial, -40 to 85°C

“C”: Extended Commercial, -20 to 70°C

Special Features

“A” for Low g-Sensitivity, 0.1ppb/g

340. 000001 to 725. 000000 MHz

DCXO Pull Range

“M”

“B”

“C”

“E”

“F”

“G”

“H”

“X”

“L”

“Y”

“S”

“Z”

“U”

± 25 ppm

± 50 ppm

± 80 ppm

±100 ppm

±125 ppm

±150 ppm

±200 ppm

±400 ppm

± 600 ppm

±800 ppm

±1200 ppm

±1600 ppm

±3200 ppm

Signaling Type

“1”: LVPECL

“2”: LVDS

“4”: HCSL

Package Size

“C”: 5. 0 x 3. 2 mm

Frequency Stability/Grade

“F”: ±10 ppm

“1”: ±20 ppm

“2”: ±25 ppm

“3”: ±50 ppm

Serial IF mode

“S”

: SPI mode

“0-G”

: I

C mode (See below)

I C Factory Programmable Addresses

“0-F” : I C Address factory programmed

Sets Bits 3: 0 of Device I

C address to

the Hex value of the ordering code .

When the I C address is factory

programmed using these codes ,

pin A0, A1 are NC

“G”: I

C address controlled by A0, A1 pins

C Address

1100000

1100010

1101000

1101010 (default)

Voltage Supply

“25” : 2. 5 V ±10%

“28” : 2.8 V ±10%

“30” : 3.0 V ±10%

“33” : 3. 3 V ±10%

OE Pin Control

“-”: OE under software Control.

Pin 1 and 2 are both NC.

“1”: Pin 1 OE, Pin 2 NC

“2”: Pin 1 NC, Pin 2 OE

Notes:

1. -40 to 105°C option available only for I

C operation.

2. Bulk is available for sampling only.

A1:A0

Rev 1.00

Page 2 of 49

www.sitime.com

SiT3542

340 to 725 MHz Endura™ Series I

C/SPI Programmable Oscillator

Table of Contents

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

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

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

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

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

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

2 Device Configurations and Pin-outs ........................................................................................................................................ 9

3 Waveform Diagrams ............................................................................................................................................................. 11

4 Termination Diagrams ........................................................................................................................................................... 13

4.1. LVPECL .................................................................................................................................................................... 13

4.2. LVDS ........................................................................................................................................................................ 15

4.3. HCSL ........................................................................................................................................................................ 16

5 Test Circuit Diagrams ........................................................................................................................................................... 17

6 Architecture Overview ........................................................................................................................................................... 19

7 Functional Overview ............................................................................................................................................................. 19

7.1. User Programming Interface ..................................................................................................................................... 19

7.2. Start-up output frequency and signaling types .......................................................................................................... 19

7.3. In-system programmable options.............................................................................................................................. 19

8 In-system Programmable Functional Description.................................................................................................................. 20

8.1. Any-frequency function ............................................................................................................................................. 20

8.2. DCO Functional Description ..................................................................................................................................... 25

8.3. Pull Range, Absolute Pull Range .............................................................................................................................. 27

8.4. Software OE Functional Description ......................................................................................................................... 29

9 I

C/SPI Control Registers...................................................................................................................................................... 30

9.1. Register Address: 0x00. DCO Frequency Control Least Significant Word (LSW) .................................................... 30

9.2. Register Address: 0x01. OE Control, DCO Frequency Control Most Significant Word (MSW) ................................. 31

9.3. Register Address: 0x02. DCO PULL RANGE CONTROL ........................................................................................ 32

9.4. Register Address: 0x03. Frac-N PLL Integer Value and Frac-N PLL Fraction MSW ................................................ 33

9.5. Register Address: 0x04. Frac-N PLL Fraction LSW.................................................................................................. 33

9.6. Register Address: 0x05. PostDiv, Driver Control ...................................................................................................... 34

9.7. Register Address: 0x06. mDriver, Driver Control ...................................................................................................... 35

10 I

C Operation ........................................................................................................................................................................ 36

10.1. I

C protocol ............................................................................................................................................................... 36

10.2. I

C Timing Specification ............................................................................................................................................ 39

10.3. I

C Device Address Modes ....................................................................................................................................... 40

11 SPI Operation ....................................................................................................................................................................... 41

Schematic Examples ................................................................................................................................................................. 44

Dimensions and Patterns ........................................................................................................................................................... 47

Additional Information ................................................................................................................................................................ 48

Revision History ......................................................................................................................................................................... 49

Rev 1.00

Page 3 of 49

www.sitime.com

SiT3542

340 to 725 MHz Endura™ Series I

C/SPI Programmable Oscillator

1 Electrical Characteristics

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

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

Table 1. Electrical Characteristics – Common to LVPECL, LVDS and HCSL

Parameter

Output Frequency Range

Symbol

Min.

340.000001

Typ.

–

Max.

725.000000

500.000000

Unit

MHz

Condition

LVDS and LVPECL output driver, factory or user

programmable, accurate to 6 decimal places

HCSL output driver, factory or user programmable, accurate to

6 decimal places

Inclusive of initial tolerance, operating temperature, rated

power supply voltage and load variations

Frequency Range

Frequency Stability

F_stab

-20

-25

-50

First Year Aging

F_1y

–

±1

–

+20

+25

+50

–

ppm

-year aging at 25°C

Temperature Range

Operating Temperature Range

T_use

-20

-40

+70

+85

+105

°C

Extended Commercial

Industrial

Extended Industrial. Available only for I

C operation, not SPI.

Rugged Characteristics

Acceleration (g) sensitivity,

Gamma Vector

Supply Voltage

F_g

–

0.1

Supply Voltage

Vdd

2.97

2.7

2.52

2.25

3.3

3.0

2.8

2.5

–

100

–

3.63

3.3

3.08

2.75

–

30%

–

ppb/g

Low sensitivity grade; total gamma over 3 axes; 15 Hz to

2 kHz; MIL-PRF-55310, computed per section 4.8.18.3.1

Input Characteristics – OE Pin

Input Voltage High

Input Voltage Low

Input Pull-up Impedance

VIH

VIL

Z_in

70%

–

Vdd

kΩ

OE pin

OE pin, logic high or logic low

Output Characteristics

Duty Cycle

–

Startup and Output Enable/Disable Timing

Start-up Time

Output Enable/Disable Time –

Hardware control via OE pin

Output Enable/Disable Time –

Software control via I

C/SPI

T_start

T_oe_hw

3.0

9.1

µs

Measured from the time Vdd reaches its rated minimum value

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

Measured from the time the last byte of command is

transmitted via I

C/SPI (reg1) to the time clock pins reach 90%

of swing and high-Z. See

Figure 30

and

Figure 31

T_oe_sw

–

11.8

µs

Rev 1.00

Page 4 of 49

www.sitime.com

SiT3542

340 to 725 MHz Endura™ Series I

C/SPI Programmable Oscillator

Table 2. Electrical Characteristics – LVPECL Specific

Parameter

Symbol

Min.

Typ.

Max.

Unit

Condition

Current Consumption

OE Disable Supply Current

Output Disable Leakage Current

Maximum Output Current

Idd

I_OE

I_leak

I_driver

–

0.10

–

A

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

OE = Low

Maximum average current drawn from OUT+ or OUT-

Output Characteristics

Output High Voltage

Output Low Voltage

Output Differential Voltage Swing

Rise/Fall Time

VOH

VOL

V_Swing

Tr, Tf

Vdd - 1.1V

Vdd - 1.9V

1.2

–

1.6

225

Vdd - 0.7V

Vdd - 1.5V

2.0

290

Jitter

RMS Phase Jitter (random) –

DCO Mode Only

T_phj

–

RMS Phase Jitter (random) –

Any-frequency Mode Only

T_phj

–

RMS Period Jitter

[3]

Note:

3. Measured according to JESD65B

T_jitt

–

0.22

0.075

0.23

0.09

0.260

0.085

0.325

0.095

1.6

f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,

all Vdd levels

f = 622.08, IEEE802.3-2005 10 GbE jitter mask integration

bandwidth = 1.875 MHz to 20 MHz, all Vdd levels

f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,

all Vdd levels

f = 622.08, IEEE802.3-2005 10 GbE jitter mask integration

bandwidth = 1.875 MHz to 20 MHz, all Vdd levels

f = 622.08 MHz, Vdd = 3.3V or 2.5V

See

Figure 5

See

Figure 5

See

Figure 6

20% to 80%, see

Figure 6

Table 3. Electrical Characteristics – LVDS Specific

Parameter

Symbol

Min.

Typ.

Max.

Unit

Condition

Current Consumption

OE Disable Supply Current

Output Disable Leakage Current

Idd

I_OE

I_leak

–

0.15

–

A

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

OE = Low

Output Characteristics

Differential Output Voltage

Delta VOD

Offset Voltage

Delta VOS

Rise/Fall Time

VOD

ΔVOD

VOS

ΔVOS

Tr, Tf

250

–

1.125

–

340

530

1.375

460

Jitter

RMS Phase Jitter (random) –

DCO Mode Only

T_phj

–

RMS Phase Jitter (random) –

Any-frequency Mode Only

T_phj

–

RMS Period Jitter

[4]

Note:

4. Measured according to JESD65B.

T_jitt

–

0.21

0.060

0.21

0.070

0.255

0.070

0.320

0.80

1.6

f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,

all Vdd levels

f = 622.08 MHz, IEEE802.3-2005 10 GbE jitter mask

integration bandwidth = 1.875 MHz to 20 MHz, all Vdd levels

f = 622.08 MHz, Integration bandwidth = 12 kHz to 20 MHz,

all Vdd levels

f = 622.08 MHz, IEEE802.3-2005 10 GbE jitter mask

integration bandwidth = 1.875 MHz to 20 MHz, all Vdd levels

f = 622.08 MHz, Vdd = 3.3V or 2.5V

f = 622.08 MHz. See

Figure 7

See

Figure 7

See

Figure 7

See

Figure 7

Measured with 2 pF capacitive loading to GND, 20% to 80%,

see

Figure 8

Rev 1.00

Page 5 of 49

www.sitime.com

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