The Smart Timing Choice
The Smart Timing Choice
SiTime Corporation 990 Almanor Avenue Sunnyvale, CA 94085 (408) 328-4400 www.sitime.com
Rev. 1.2 Revised October 6, 2014
SiT3821
1-220 MHz High Performance Differential VCXO
Features Applications
Any frequency between 1 MHz and 220 MHz accurate to 6 decimal
places
Ideal for SONET, Video, Instrumentation, Satellite applications
Widest pull range options: ±25, ±50, ±100, ±150, ±200, ±400, ±800,
±1600 ppm
Telecom, networking, broadband
Superior pull range linearity of ≤ 1%, 10 times better than quartz
0.6ps RMS phase jitter (random) over 12 kHz to 20 MHz bandwidth
Industrial and extended commercial temperature ranges
Industry-standard packages: 3.2 mm x 2.5 mm, 5.0 mm x 3.2 mm and
7.0 mm x 5.0 mm
For frequencies higher than 220 MHz, refer to SiT3822 datasheet
Electrical Characteristics
Parameter and Conditions Symbol Min. Typ. Max. Unit Condition
LVPECL and LVDS, Common AC Characteristics
Output Frequency Range f 1 – 220 MHz
Frequency Stability F_stab -10 – +10 ppm Inclusive of initial tolerance, operating temperature, rated
power, supply voltage and load change
-25 – +25 ppm
-50 – +50 ppm
Operating Temperature Range T_use -40 – +85 °C Industrial
-20 – +70 °C Extended Commercial
Start-up Time T_start – – 10 ms
Duty Cycle DC 45 – 55 % Contact SiTime for tighter duty cycle
Pull Range PR ±25, ±50, ±100, ±150,
±200, ±400, ±800, ±1600
ppm See the last page for Absolute Pull Range, APR table
Upper Control Voltage VC_U 3.2 – – V Vdd = 3.3V, Voltage at which maximum deviation is guaranteed
2.4 – – V Vdd = 2.5V, Voltage at which maximum deviation is guaranteed
Lower Control Voltage VC_L – – 0.1 V Voltage at which maximum deviation is guaranteed
Linearity Lin––1%
Frequency Change Polarity – Positive Slope –
Control Voltage Bandwidth (-3dB) V_BW – 8 – kHz Contact SiTime for 16 kHz or other high bandwidth options
Vin Pin Input Impedance Z_vin 100 – – kΩ Pin 1
First Year Aging -2 – +2 ppm 25°C
10-year Aging -5 – +5 ppm 25°C
LVPECL, DC and AC Characteristics
Supply Voltage Vdd 2.97 3.3 3.63 V
2.25 2.5 2.75 V
Current Consumption Idd – 61 69 mA Excluding Load Termination Current, Vdd = 3.3V or 2.5V
OE Disable Supply Current I_OE – – 35 mA OE = Low
Output Disable Leakage Current I_leak––1AOE = Low
Maximum Output Current I-driver – – 30 mA Maximum average current drawn from OUT+ or OUT-
Output High Voltage VOH Vdd-1.1 – Vdd-0.7 V See Figure 1
Output Low Voltage VOL Vdd-1.9 – Vdd-1.5 V See Figure 1
Output Differential Voltage Swing V_Swing 1.2 1.6 2.0 V See Figure 1
Rise/Fall Time Tr, Tf – 300 500 ps 20% to 80%
OE Enable/Disable Time T_oe – – 115 ns f = 220 MHz - For other frequencies, T_oe = 100ns + 3 period
RMS Period Jitter T_jitt – 1.2 1.7 ps f = 100 MHz, Vdd = 3.3V or 2.5V
– 1.2 1.7 ps f = 156.25 MHz, Vdd = 3.3V or 2.5V
– 1.2 1.7 ps f = 212.5 MHz, Vdd = 3.3V or 2.5V
RMS Phase Jitter (random) T_phj – 0.5 0.75 ps f = 156.25 MHz, Integration bandwidth = 12 kHz to 20 MHz, all
Vdds
