SiT3800
Preliminary
SiT3800, High performance Voltage Controlled
Oscillator:
• 1 MHz to 200 MHz
• Linear pull range +/-240ppm or +/-60ppm
• Small form factor
• Excellent frequency accuracy/jitter
These highly reliable oscillators are
completely Quartz free.
Features
•
•
•
•
•
•
•
Frequency range
o
1 MHz to 200 MHz
RMS phase jitter (random)
o
0.7ps (typical)
Linear pull range
o
+/-240ppm or +/-60ppm
VCMO tuning voltage
o
0V to 1.6V for all Vdds
Operating voltage
o
1.8 V / 2.5 V to 3.3 V
Total frequency stability
o
+/- 50 ppm or +/-100 ppm
World’s Smallest Footprints:
o
2.5 x 2.0 x 0.85 mm
o
3.2 x 2.5 x 0.85 mm
o
5.0 x 3.2 x 0.85 mm
Operating Temperature Range
o
-40C to +85C
o
-10C to +70C
Ultra-Reliable start up and greater
immunity from interference
Benefits
•
No crystal or capacitors
required
o
Eliminates crystal
qualification time
o
50%+ board space
saving
Applications
•
•
•
Data communication
ADSL
DSL
•
•
Description
The SiT3800 is a high performance Voltage Controlled
MEMS Oscillator, VCMO (VCXO equivalent), suitable
for most communication applications. The pull range
can be set to +/-240ppm (480ppm total) or +/-60ppm
(120ppm total). The SiT3800 offers unparalleled
flexibility in terms of frequency range, frequency
accuracy tolerance, supply voltage, and operating
temperature range while simultaneously offering
outstanding performance in terms of linearity of the
VCMO pull range.
The SiT3800 is a factory programmable device that
enables user to pull the frequency by applying 0V to
SiT3800 REV A November 30, 2007
SiTime Corporation - 990 Almanor Avenue - Suite 200 - Sunnyvale, CA 94085 - (408) 328-4400 - www.sitime.com
1.6V to the VCMO control pin (pin1).
The SiT3800, by eliminating the external quartz
crystal, has improved immunity to the
environmental effects of vibration, shock, strain,
and humidity.
To order samples, go to www.sitime.com and click
on “Request sample” link.
SiT3800 VCMO
(VCXO)
Preliminary
Block Diagram
Package Thermal Characteristics
Theta JA = 30ºC/W with copper plane on VDD and
GND
Theta JA = 120ºC/W with PCB traces of 0.010” to all
pins
VIN
1 to 200 MHz
Pin Description
Pin Number
1
Pin Name
VIN
Pin Type
Input
Pin Description
0 to 1.6V for pulling the output
frequency
Connect to Ground
1 to 125ogrammed MHz Clock output
Connect to 1.8V or 2.5V to 3.3V
2
3
4
GND
CLK
VDD
Power
Output
Power
Pull Range
The SiT3800 can be factory programmed to provide a completely linear profile. As it’s shown in figure1 and 2,
regardless of the Vdd voltage (1.8V/2.5V/3.3V) the output frequency can be pulled by applying 0V to 1.6V to the
VIN pin. This feature enables a tight control over the pull range by guarantying zero ppm frequency shift at VIN=
0.8V for all the Vdds.
Figure1- +/-60 ppm pull range, VIN=0V to 1.6V, Vdd=1.8V/2.5V/3.3V
VIN (V)
Figure1- +/-240 ppm pull range, VIN=0V to 1.6V, Vdd=1.8V/2.5V/3.3V
VIN (V)
SiT3800 REVA November 30, 2007
SiTime Corporation - 990 Almanor Avenue - Suite 200 - Sunnyvale, CA 94085 - (408) 328-4400 - www.sitime.com
SiT3800 VCMO
(VCXO)
Preliminary
Absolute Maximum Ratings
Attempted operation outside the absolute maximum ratings of the part may cause permanent damage to the
part. Actual performance of the IC is only guaranteed within the operational specifications not absolute
maximum ratings.
Parameter
Storage Temperature
Commercial Operation Temperature
Industrial Operation Temperature
VDD
Electrostatic Discharge
Soldering Temperature (follow standard Pb free soldering guidelines)
# of Program Writes
Program Retention over -40 to 125C, Process, VDD (0 to 3.6V)
Min
-65
-10
-40
-0.5
Max
150
70
85
+3.6
2000
260
1
1,000+
Unit
°C
°C
°C
V
V
°C
NA
years
DC Electrical Specifications
The following specification apply at 1.8V +/- 5%, -10 to 70 °C
Parameter
Operating VDD
VIN Voltage Range
Pull Range
Option 1
Option 2
Voltage Output High
Voltage Output Low
Operating Current
Operating Current
Power Up Time
20 mA load current
10 mA source current
Output frequency = 30 MHz, 15
pF load
Output frequency = 125 MHz, 15
pF load
Condition
1.8V operation
Min
1.71
0
-60
-240
80% of Vdd
-
-
-
-
Typical
1.8
-
-
-
-
-
21
25
10
Max
1.89
1.6
+60
+240
-
20% of Vdd
-
-
-
Unit
V
V
ppm
ppm
V
V
mA
mA
ms
The following specification apply at 3.3V +/-5% or 2.5V +/-5%, -10 to 70 °C
Parameter
Operating VDD
VIN Voltage Range
Pull Range
Option 1
Option 2
Operating VDD
Voltage Output High
Voltage Output Low
Operating Current
2.5V operation
20 mA load current
10 mA source current
Output frequency = 30 MHz, 15
Condition
Min
3.15
0
-60
-240
2.37
80% of Vdd
-
-
Typical
3.3
-
-
-
2.5
-
-
22
Max
3.45
1.6
+60
+240
2.63
-
20% of Vdd
-
Unit
V
V
ppm
ppm
V
V
V
mA
SiT3800 REVA November 30, 2007
SiTime Corporation - 990 Almanor Avenue - Suite 200 - Sunnyvale, CA 94085 - (408) 328-4400 - www.sitime.com
SiT3800 VCMO
(VCXO)
Preliminary
pF load
Operating Current
Power Up Time
Output frequency = 125 MHz, 15
pF load
-
-
29
10
-
-
mA
ms
AC Electrical Specifications
The following specification apply at 1.8V +/- 5%, -10 to 70º C
Parameter
Clock Output Frequency
Clock Output Duty Cycle
Output frequency= 1MHz to 66MHz
Output frequency= 66MHz to 125MHz
Condition
Min
1
45
40
-
-
Typical
-
50
-
1.0
1.0
+/-20
Max
200
55
60
1.5
1.5
Unit
MHz
%
%
ns
ns
ps
Clock Output Rise Time
Clock Output Fall Time
Pk-pk Period Jitter
rms period jitter
rms Phase Jitter (Random)
15 pF Load
15 pF Load
Output frequency = 125 MHz
Output frequency = 125 MHz
Output frequency = 75MHz 900KHz to
7.5MHz
-
-
5
0.73
-
-
ps
ps
The following specification apply at 3.3V +/- 5% or 2.5V +/-5%, -10 to 70°C
Parameter
Clock Output Frequency
Clock Output Duty Cycle
Clock Output Rise Time
Clock Output Fall Time
Pk-pk Period Jitter
15 pF Load
15 pF Load
Output frequency = 125 MHz, VDD=3.3V
Output frequency = 125 MHz, VDD=2.5V
Condition
Min
1
45
-
-
-
-
-
-
Typical
-
50
1.0
1.0
+/-12
+/-15
4
0.73
Max
200
55
1.5
1.5
-
-
-
-
Unit
MHz
%
ns
ns
ps
ps
ps
ps
rms period jitter
rms Phase Jitter (Random)
Output frequency = 125 MHz
Output frequency = 75MHz 900KHz to
7.5MHz
Ordering Information
Part Family:
SiT3800
Revision
Letter:
Temperature
Range:
“C” -10 to 70°C
“I” -40 to 85°C
Package Size:
“1” 2.5 x 2.0 mm
“2” 3.2 x 2.5 mm
“3” 5.0 x 3.2 mm
Frequency
Tolerance:
“3” +/- 50 ppm
“4” +/- 100 ppm
Supply
Voltage:
“18” 1.8V
“25” 2.5V
“33” 3.3V
Pull Range
Option:
“1” +/-60ppm
“2” +/-240ppm
Frequency:
1.000000 MHz
to
200.00000 MHz
Package:
“T” is
Tape
& Reel
“A” is the revision
SiT3800 REVA November 30, 2007
SiTime Corporation - 990 Almanor Avenue - Suite 200 - Sunnyvale, CA 94085 - (408) 328-4400 - www.sitime.com
SiT3800 VCMO
(VCXO)
Preliminary
Package Information
2.0 mm x 2.5 mm x 0.85 mm QFN type package
2.5 mm x 3.2 mm x 0.85 mm QFN type package
3.2 mm x 5.0 mm x 0.85 mm QFN type package
SiT3800 REVA November 30, 2007
SiTime Corporation - 990 Almanor Avenue - Suite 200 - Sunnyvale, CA 94085 - (408) 328-4400 - www.sitime.com
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