Ordering Information .................................................................................................................................................................... 2
7.1. User Programming Interface ..................................................................................................................................... 19
7.2. Start-up output frequency and signaling types .......................................................................................................... 19
8.1. Any-frequency function ............................................................................................................................................. 20
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. Flac-N PLL Integer Value and Flac-N PLL Fraction MSW ................................................. 33
9.6. Register Address: 0x05. PostDiv, Driver Control ...................................................................................................... 34
9.7. Register Address: 0x06. mDriver, Driver Control ...................................................................................................... 35
2
10 I C Operation ........................................................................................................................................................................ 36
2
10.1. I C protocol ............................................................................................................................................................... 36
2
10.2. I C Timing Specification ............................................................................................................................................ 38
2
10.3. I C Device Address Modes ....................................................................................................................................... 39
Dimensions and Patterns ........................................................................................................................................................... 46
Additional Information ................................................................................................................................................................ 47
Revision History ......................................................................................................................................................................... 48
Rev 0.91
Page 3 of 48
www.sitime.com
SiT3522
340 to 725 MHz Elite™ I
2
C/SPI Programmable Oscillator
1 Electrical Characteristics
PRELIMINARY
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.
340.000001
340.000001
Typ.
–
–
Max.
725.000000
500.000000
Unit
MHz
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
Frequency Stability
F_stab
-20
-20
-25
-50
First Year Aging
Operating Temperature Range
F_1y
T_use
–
-20
-40
-40
Supply Voltage
Vdd
2.97
2.7
2.52
2.25
Input Voltage High
Input Voltage Low
Input Pull-up Impedance
Duty Cycle
Start-up Time
Output Enable/Disable Time –
Hardware control via OE pin
Output Enable/Disable Time –
Software control via I
2
C/SPI
VIH
VIL
Z_in
DC
T_start
T_oe_hw
70%
–
–
45
–
–
–
–
–
–
±1
–
–
–
3.3
3.0
2.8
2.5
–
–
100
–
–
–
+20
+20
+25
+50
–
+70
+85
+105
Supply Voltage
3.63
3.3
3.08
2.75
–
30%
–
55
3.0
9.1
V
V
V
V
Vdd
Vdd
kΩ
%
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
OE pin
OE pin
OE pin, logic high or logic low
ppm
ppm
ppm
ppm
ppm
°C
°C
°C
1 -year aging at 25°C
Extended Commercial
Industrial
Extended Industrial. Available only for I C operation, not SPI.
2
st
Temperature Range
Input Characteristics – OE Pin
Output Characteristics
Startup and Output Enable/Disable Timing
T_oe_sw
–
–
11.8
µs
Rev 0.91
Page 4 of 48
www.sitime.com
SiT3522
340 to 725 MHz Elite™ I
2
C/SPI Programmable Oscillator
Table 2. Electrical Characteristics – LVPECL Specific
Parameter
Symbol
Min.
Typ.
Max.
Unit
PRELIMINARY
Condition
Current Consumption
Current Consumption
OE Disable Supply Current
Output Disable Leakage Current
Maximum Output Current
Idd
I_OE
I_leak
I_driver
–
–
–
–
–
–
0.10
–
94
63
–
30
mA
mA
A
mA
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
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
–
0.22
0.075
0.23
0.09
1
0.260
0.085
0.325
0.095
1.6
ps
ps
ps
ps
ps
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
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
89
67
–
mA
mA
A
Excluding Load Termination Current, Vdd = 3.3V or 2.5V
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
–
–
–
–
–
–
340
530
50
1.375
50
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
1
0.255
0.070
0.320
0.80
1.6
ps
ps
ps
ps
ps
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
mV
mV
V
mV
ps
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%,
LED 是light emitting diode (发光二极管)的缩写,是一种由半导体技术制成的电光源。LED的核心部分是由P型半导体和N型半导体组成的晶片,在P型半导体和N型半导体之间有一个过渡层,称为P2N结。在正向导通时,半导体中的多数载流子和少数载流子复合,释放出的能量以光子或部分以光子的形式发射出来,大量的光子形成光子流,即发光。P2N结加反向电压时,少数载流子难以注入,故不发...[详细]
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