1 to 340 MHz I2C/SPI Programmable Oscillator
LoginThe 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.
View related products: 340 to 725 MHz | Ruggedized | 12C/SPI lineup
| Oscillator Type | I2C/SPI ISP XO-DE |
| Frequency | 1 to 340 MHz |
| Frequency Stability (ppm) | ±20, ±25, ±50 |
| Phase Jitter (rms) | ≤ 0.23 ps |
| Output Type | LVPECL, LVDS, HCSL |
| Operating Temperature Range (°C) | -20 to +70, -40 to +85, -40 to +105 |
| Pull Range (ppm) | ±25, ±50, ±80, ±100, ±125, ±150, ±200, ±400, ±600, ±800, ±1200, ±1600, ±3200 |
| Voltage Supply (V) | 2.5 to 3.3 |
| Package Type (mm²) | 5.0 x 3.2 10-pin |
| Features | In-System Programmable via I2C/SPI |
| Availability | Production |
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Image: SiT3521 I2C/SPI Programmable Oscillator 10-pin package, top & bottom
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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
SiT6712 (5032) Evaluation Board User Manual – Evaluate oscillator performance
TimeMaster Configuration Software – Configure and evaluate oscillators via I2C/SP
Frequency Slope (dF/dT) Calculator – Calculate frequency slope over temperature
QFN 5032 10-Pins 3D Step Model – Preview oscillator packages in 3D
