Ordering Information .................................................................................................................................................................... 2
User Programming Interface ..................................................................................................................................... 18
Start-up output frequency and signaling types ........................................................................................................... 18
Any-frequency function ............................................................................................................................................. 19
C/SPI Control Registers...................................................................................................................................................... 28
9 I
Register Address: 0x00. DCO Frequency Control Least Significant Word (LSW) .................................................... 28
Register Address: 0x01. OE Control, DCO Frequency Control Most Significant Word (MSW) ................................. 29
Register Address: 0x02. DCO PULL RANGE CONTROL ........................................................................................ 29
Register Address: 0x03. Frac-N PLL Feedback Divider Integer Value and Frac-N PLL Feedback Divider Fraction
Value MSW ............................................................................................................................................................... 30
Register Address: 0x05. Forward Divider, Driver Control ......................................................................................... 30
Register Address: 0x06. Driver Divider, Driver Control ............................................................................................. 31
2
C Operation ........................................................................................................................................................................ 32
10 I
I
2
C protocol ............................................................................................................................................................... 32
I
2
C Timing Specification ............................................................................................................................................ 35
I
2
C Device Address Modes ....................................................................................................................................... 36
Dimensions and Patterns ........................................................................................................................................................... 43
Additional Information ................................................................................................................................................................ 44
Revision History ......................................................................................................................................................................... 45
Rev 1.01
Page 3 of 45
www.sitime.com
SiT3521
1 to 340 MHz Elite Platform I2C/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
f
Min.
1
Typ.
–
–
–
–
–
±1
–
–
–
Max.
340
Unit
MHz
Condition
Factory or user programmable, accurate to 6 decimal places
Frequency Range
Frequency Stability
Frequency Stability
F_stab
-10
-20
-25
-50
First Year Aging
F_1y
–
+10
+20
+25
+50
–
ppm
ppm
ppm
ppm
ppm
°C
°C
°C
1
st
-year aging at 25°C
Inclusive of initial tolerance, operating temperature, rated
power supply voltage and load variations.
Temperature Range
Operating Temperature Range
T_use
-20
-40
-40
+70
+85
+105
Supply Voltage
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%
–
V
V
V
V
Extended Commercial
Industrial
Extended Industrial. Available only for I
2
C operation, not SPI.
Input Characteristics – OE Pin
Input Voltage High
Input Voltage Low
Input Pull-up Impedance
VIH
VIL
Z_in
70%
–
–
Vdd
Vdd
kΩ
OE pin
OE pin
OE pin, logic high or logic low
Output Characteristics
Duty Cycle
DC
45
–
–
55
%
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
2
C/SPI
T_start
T_oe_hw
3.0
3.8
ms
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
2
C/SPI (reg1) to the time clock pins reach 90%
of swing and high-Z. See
Figure 30
and
Figure 31
T_oe_sw
–
–
6.5
µs
Rev 1.01
Page 4 of 45
www.sitime.com
SiT3521
1 to 340 MHz Elite Platform I2C/SPI Programmable Oscillator
Table 2. Electrical Characteristics – LVPECL Specific
Parameter
Symbol
Min.
Typ.
Max.
Unit
Condition
Current Consumption
Current Consumption
OE Disable Supply Current
Output Disable Leakage Current
Maximum Output Current
Idd
I_OE
I_leak
I_driver
–
–
–
–
–
–
0.15
–
89
58
–
32
mA
mA
A
mA
Excluding Load Termination Current, Vdd = 3.3 V or 2.5 V
OE = Low
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
–
0.225
0.1
0.225
0.11
1
0.340
0.14
0.340
0.15
1.6
ps
ps
ps
ps
ps
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 100, 156.25 or 212.5 MHz, Vdd = 3.3 V or 2.5 V
V
V
V
ps
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
Current Consumption
OE Disable Supply Current
Output Disable Leakage Current
Idd
I_OE
I_leak
–
–
–
–
–
0.15
80
61
–
mA
mA
A
Excluding Load Termination Current, Vdd = 3.3 V or 2.5 V
OE = Low
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
–
–
–
–
–
–
400
455
50
1.375
50
470
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
0.1
0.21
0.1
1
0.275
0.12
0.367
0.12
1.6
ps
ps
ps
ps
ps
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz,
all Vdd levels
f = 156.25, IEEE802.3-2005 10 GbE jitter mask integration
bandwidth = 1.875 MHz to 20 MHz, all Vdd levels
f = 100, 156.25 or 212.5 MHz, Vdd = 3.3 V or 2.5 V
mV
mV
V
mV
ps
f = 156.25MHz See
Figure 7
See
Figure 7
See
Figure 7
See
Figure 7
Measured with 2 pF capacitive loading to GND, 20% to 80%,
Working hours of heart rate braceletThe battery capacity of this kind of smart bracelet that can monitor heart rate and even blood pressure in real time is generally less than 100mAh. Some products ca...
[i=s]This post was last edited by chrisrh on 2022-1-4 17:59[/i]1. Unboxing
I communicated and placed an order on TMALL on the afternoon of December 31, 2021 and applied for the board. It was delivered...
Author: Huang Gang, member of Yibo Technology Expressway MediaAccording to normal thinking logic, the routing layer of high-speed signals is generally 0.5oz or 1oz. If you see a high-speed signal on t...
ADCADC is the English abbreviation of analog-to-digital converter, which is an electronic component that can convert analog signals into digital signals. Usually, the signal is sampled and held, and t...
This year is the first year of 5G, so this year we have officially entered the 5G era. Compared with 4G, 5G has a higher frequency, so in order to achieve the same network coverage, the number of 5G b...
The LIS2DW12 is a low-power three-axis acceleration (motion) sensor that supports multiple operating modes and can be used for:Motion Detection for Wearable Devices
Gesture recognition and games
Motio...
Against the backdrop of the continued rise of the global new energy industry, the emerging energy storage technology company, Yihang New Energy, recently held a grand new product launch conference,...[Details]
According to foreign media reports, forensic software developer Elcomsoft has just updated its toolkit to allow partial data extraction from unlocked iPhone devices running iOS 12 to iOS 13.3....[Details]
Due to the limitation of wireless transmission bandwidth, the high-resolution video images obtained by UAVs for ground target reconnaissance must be effectively compressed before they can be t...[Details]
Kuala Lumpur, Malaysia, August 3, 2022 - (ACN Newswire) - Celebrating its 11th anniversary! Here are OctaFX’s achievements over the years and the core elements of its brand philosophy along the way. ...[Details]
Tesla has great prospects in electric vehicles and has been recognized by investors. Experienced manufacturers may encounter it. Some investors even believe that Tesla's revenue will reach 1 trillion...[Details]
Preface
:
It wasn’t until the end of 2022 when ChatGPT became popular that the humanoid track began to show signs of hope.
After a wave of enthusiasm last year, the concept of human...[Details]
Li Ye pointed out that it is necessary to strengthen the guidance of emerging technologies such as energy internet, smart grid, power storage, hydrogen energy, etc. Establish and improve the techni...[Details]
In circuit design, we are generally concerned about the quality of signals, but sometimes we tend to limit our research to signal lines and treat power and ground as ideal situations. Although this...[Details]
Cambridge-based chip design company ARM was forced to suspend business with Huawei after US President Trump added the Chinese company to the US "banned entity" list. The move follows similar moves by...[Details]
1 Introduction
The inertial navigation system has the characteristics of complete autonomy, all-weather and anti-interference, and can provide complete navigation and positioning parameters. It h...[Details]
LED control port initialization //Initialize PA8 and PD2 as output ports. And enable the clocks of these two ports //LED IO initialization void LED_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructur...[Details]
When I first started learning microcontrollers, the scrolling of LCD1602 could only achieve 2 lines moving at the same time, so I changed it and wrote a scrolling program. When testing, I found a pro...[Details]
Introduction: Researchers from LG Energy Solution (LGES) and the University of California, San Diego (UCSD) have developed a new battery that combines two technical approaches . The battery has both ...[Details]
RTC-Real Time Clock is a real-time clock module for 430 microcontrollers. It can be configured as a real-time clock mode (perpetual calendar) or a general-purpose 32-bit counter mode. The real-time...[Details]
The carrier of textile testing technology is textile testing instruments . In recent decades, textile testing instruments have made great progress in testing mechanism, mechatronics level, microcom...[Details]
Test/Measurement
京公网安备 11010802033920号
EEWORLD
