1 to 340 MHz I2C/SPI Programmable Oscillator
The SiT3521 is an ultra-low jitter, user programmable oscillator. This device is based on SiTime's Elite Platform™ that utilizes unique DualMEMS™ temperature sensing and TurboCompensation™ technology to deliver exceptional dynamic performance, making it:
- Resistant to airflow and thermal shock
- Resistant to shock and vibration
- Superior power supply noise rejection
The device supports two in-system programming options:
1) Any-frequency mode to reprogram the clock output to any frequency between 1 MHz to 340 MHz
2) Digitally controlled oscillator (DCO) mode to steer or pull the clock up to ±3200 ppm
Combined with wide frequency range and user programmability, this device is ideal for telecom, networking and industrial applications that require a variety of frequencies and operate in noisy environments.
| Oscillator Type | I2C/SPI ISP XO-DE |
| Frequency | 1 to 340 MHz |
| Frequency Stability (ppm) | ±20, ±25, ±50 |
| Operating Temperature Range (°C) | -20 to +70, -40 to +85 |
| Output type | LVPECL, LVDS, HCSL |
| Package Type (mm²) | 5.0 x 3.2 10-pin |
| Phase Jitter (RMS) | ≤ 0.23 ps |
| Features | In-System Programmable via I2C/SPI |
| Voltage Supply (V) | 2.5 to 3.3 |
| Pull Range (ppm) | ±25, ±50, ±80, ±100, ±125, ±150, ±200, ±400, ±600, ±800, ±1200, ±1600, ±3200 |
| Availability | Production |
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I2C/SPI programmable oscillators in small 5.0 x 3.2 mm packages
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SiT3521 pin assignments
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SiT3521 block diagram
In-system programmable from 1 MHz and 340 MHz via I2C/SPI
Digital frequency pulling (DCO) via I2C/SPI
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Output frequency pulling with perfect pull linearity
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13 programmable pull range options to ±3200 ppm
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Frequency pull resolution as low as 5 ppt (0.005 ppb)
Dynamic performance
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0.1 ppb/g, superior shock and vibration resistance
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No activity dips or micro jumps
Integrated LDO for on-chip power supply noise filtering
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0.05 ps/mV power supply noise rejection (PSNR)
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Reduces BOM by eliminating a LDO
Programmable LVPECL, LVDS, or HCSL output
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Programmable LVPECL, LVDS Swing
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LVDS Common Mode Voltage Control
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Optimizes signal integrity
Superior reliability
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1 billion hours MTBF
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Lifetime Warranty: Reduces repair costs and field failures due to clock components
- 10G to 100G Ethernet
- SONET
- Data centers
- Test and measurement
| Document Name | Type |
|---|---|
| Electronics Industry Citizen Coalition Template | Other Quality Documents |
| Manufacturing Notes for SiTime Oscillators | Other Quality Documents |
| SiTime Conflict Metal Declaration | Other Quality Documents |
| SiTime Environmental Policy | Other Quality Documents |
| SiTime Warranty on Date Code (16.72 kB) | Other Quality Documents |
| ISO9001:2015 Certificate of Registration | Other Quality Documents |
| Conflict Minerals Reporting Template | Other Quality Documents |
| 4L/6L-QFN Package Homogeneous Materials and SGS Report | RoHS/Reach/Green Certificates |