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%,
In the field of electrical control, it is not difficult to get started, but it is more difficult to master it. If the method is not appropriate, it will be very difficult to learn. The big guys on the...
[i=s]This post was last edited by annysky2012 on 2021-2-5 14:19[/i]A netizen posted a message on the forum asking for advice. The timing value set during the timer initialization was 1us, but after se...
Lithium-ion batteries can be used in small electronic devices as well as larger applications such as electric vehicles and power grids, and they can easily meet the requirements of various sizes, volt...
#NB-IoT# Using China Telecom NB-IoT network, the development board is completed with Quectel BC26 module (MediaTek MTK2625), and the power consumption test data reference after the network is OK in DR...
“Ride my beloved little motorcycle, it will never get stuck in traffic”!
Have you ever thought that one day the electric bike you ride on the road will also have a navigation system?
According to Leif...
The 12th Five-Year Plan for the Development of Internet of Things has been officially issued recently. The plan clearly states that it will increase fiscal and tax support, increase the scale of spec...[Details]
The structure of the electrodynamic measuring mechanism is shown in Figure 1. It has two coils, namely, a fixed coil 1 (referred to as fixed coil) and a movable coil 6 (referred to as moving coil). ...[Details]
On August 18, Xingji Micro-Equipment released its semi-annual report stating that in the first half of 2021, the company achieved operating income of 186 million yuan, a year-on-year increase of 145....[Details]
Since Armv8.5, Memory Tag Extensions (MTE) have been supported to track common illegal memory operations by tagging memory. Lu Minsheng, director of software strategy of Arm's terminal division, sa...[Details]
On June 13, a survey released by the Korean Intellectual Property Office (KIPO) showed that South Korea ranked first in the world in patent applications for OLED panel compensation and correction tec...[Details]
LCD1602 is the most basic character LCD display, which can display 16x02=32 characters. So the operation of timing - reading and writing is the most important content. Today, I will take you to read ...[Details]
Infineon Technologies AG (FSE: IFX / OTCQX: IFNNY) and GT Advanced Technologies (GTAT) have signed a five-year supply agreement for silicon carbide (SiC) ingots. With this supply contract, Infineon w...[Details]
Recently, foreign media exposed the new trademark "XCover FieldPro" applied by Samsung, which may be an advanced version of Samsung Galaxy XCover 4s. As early as June, Samsung officially announced ...[Details]
Permanent magnet motors use permanent magnets as rotors and are synchronous motors. They are relatively more efficient than asynchronous motors. From the perspective of torque control, the control ...[Details]
In winter, the attenuation of lithium iron phosphate batteries is greater than that of ternary lithium batteries. The difference exists, but it is not large. For example, under the same conditions, t...[Details]
According to realmicentral, Samsung has begun producing HW4.0 computer chips for Tesla and has begun developing new in-vehicle computer products for the autonomous car and self-driving car markets. T...[Details]
In view of the wide application of GPS technology in power systems, this paper systematically introduces the existing direct and indirect measurement methods of generator power angle, and analyzes ...[Details]
It took me almost three days to send a CAN message. I had never used CAN or DMA before, so I encountered a lot of resistance. Fortunately, I finally figured it out.
There are too many CAN frame forma...[Details]
0 Introduction Generally, the AM modulator is realized by analog multiplier, and mixer is rarely used as AM modulator. ILS (Instrument Landing System) is an auxiliary navigation equipment widely use...[Details]
The alarm problem after replacing the servo motor encoder may be caused by many reasons.
1. Basic knowledge of servo motor encoder
The role of servo motor encoder
A servo...[Details]
Analogue and Mixed Signal
京公网安备 11010802033920号
EEWORLD
