Downhole Instrumentation

Oil drilling exploration, the oil workers are working

The downhole/drilling environment is one of the harshest on Earth, with high temperatures, high pressure, and high mechanical shock and vibration. SiTime Endura™ ruggedized oscillators offer high reliability. They are built for rugged industrial automation applications that demand ultra-high resiliency to a wide range of harsh conditions.

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SiTime MEMS Timing Benefits

Complete MEMS clock tree

High Temperature XO

Low jitter differential XO

Super-TCXO

Accurate and robust

Excellent stability over temperature

Better shock/vibration resistance

Higher quality and reliability

Easy to use, built to last

Programmable features

No quartz reliability issues

>2 billion hour MTBF

The silicon MEMS-based Endura oscillators deliver the lowest acceleration sensitivity, best shock and vibration resistance, high-reliability, and superior dynamic performance under airflow, thermal gradients, pressure, and power supply noise.

Endura products can be factory-programmed to any combination of frequency, stability, and voltage within a wide range of parameters, eliminating the long lead times and customization costs associated with quartz products. Endura oscillators are tested in accordance with MIL-PRF-55310 and MIL-STD-883 specifications. Standard or custom up-screening flows are available.

Downhole Instrumentation Block Diagrams

Downhole instrumentation collects critical, real-time data. Key applications include monitoring while drilling (MWD) and logging while drilling (LWD). These are similar devices but employ different types of sensors.

MWD records instantaneous on-drill parameters which can be used to supply contextual information for in-site, down hole conditions, such as changes in geology, the presence of pre-existing fractures or voids and dynamic alterations.

 

 

LWD is a more modern version of the much older wireline tools. LWD tools collect down-hole data while drilling without needing to remove drill pipe from the well. LWD offers similar functionality as wireline logging with differences in data quality, resolution, and/or coverage.

 

Endura™ Timing Solutions

Devices Key Features Key Values
Single-ended Oscillator
SiT8944  1 to 60 MHz
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SiT8945  60 to 220 MHz
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  • ±10 ppm to ±50 ppm frequency stability over -55°C to 125°C
  • 0.1 ppb/g acceleration sensitivity
  • Low jitter: < 0.5 ps RMS [1]
  • 1.8 V, 2.5 V, 3.3 V
  • Better frequency and jitter margin enhance system stability and robustness
  • Easy availability of any device configuration
  • Minimizes EMI from the oscillator
Differential Oscillator
SiT9346  1 to 220 MHz
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SiT9347  220 to 725 MHz
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  • Low jitter 0.23 ps RMS[1]
  • LVPECL, LVDS, HCSL
  • 2.5 to 3.3 V
  • -40°C to 105°C
  • 3.2 x 2.5 mm package
  • Meets demanding jitter requirements
  • Small PCB footprint, easier layout
  • Easy design due to flexibility
  • MEMS reliability
DCXO
SiT3541  1 to 220 MHz
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SiT3542  220 to 725 MHz
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  • Digital frequency control I2C/SPI
  • ±3200 ppm pull range
  • 5 ppt resolution
  • ±10 ppm to ±50 ppm frequency stability over temp range
  • Eliminates need for external DAC to control a VCXO
  • Better accuracy, lower noise due to digital control
Super-TCXO
SiT5146  1 to 60 MHz
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SiT5147  1 to 60 MHz
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  • ±0.5 to ±2.5 ppm stability over 55°C to 105°C
  • ±15 ppb/°C
  • 0.009 ppb/g acceleration sensitivity
  • Extremely stable under shock and vibration
  • No change in phase noise under vibrations
  • Minimizes link drops due to shock, vibration, or temperature change
  • I2C/SPI digital control available to speed design
Super-TCXO
SiT5346  1 to 60 MHz
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SiT5347  60 to 220 MHz
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  • ±0.1 to ±0.25 ppm stability over -40°C to 105°C
  • ±1 ppb/°C
  • 0.009 ppb/g acceleration sensitivity
  • Extremely stable under shock and vibration
  • No change in phase noise under vibrations
  • Minimizes link drops due to shock, vibration, or temperature change
  • I2C/SPI digital control available to speed design
Super-TCXO
SiT5348  1 to 60 MHz
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SiT5349  60 to 220 MHz
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  • ±50 ppb stability over -40°C to 105°C
  • ±1 ppb/°C
  • 0.009 ppb/g acceleration sensitivity
  • Extremely stable under shock and vibration
  • No change in phase noise under vibrations
  • Minimizes link drops due to shock, vibration, or temperature change
  • I2C/SPI digital control available to speed design
32.768 kHz Oscillator
  • ±20, ±50, ±100 ppm stability over -40 to +125°C
  • < 490 nA consumption
  • 1.2 x 1.1 mm
  • Excellent stability
  • Low power
  • Small footprint

1 12 kHz to 20 MHz integration range

SiTime Timing Solutions Advantages

Compared to quartz crystal oscillators, MEMS-based oscillators are more resistant to shock and vibration, highly immune to electromagnetic energy and power supply noise, and are programmable.

More robust in harsh environments

  • 4x better vibration resistance — 0.1 ppb/g typical
  • 20x better shock survivability

Better stability over a wide temperature range

  • Up to -55 to +125°C operation
  • Airflow and thermal shock resistant — 1 ppb/°C

Programmability for flexible design

  • Any frequency, any stability, any voltage within a wide range
  • Qualify once for multiple parts

Higher quality and reliability

  • Up to 50x better reliability — 2.2 billion-hour MTBF
  • Lifetime warranty

Unique features

  • EMI reduction — up to 30 dB lower
  • Low power for longer battery life
  • Smaller size — down to 1.2 mm x 1.1 mm packages

MEMS Timing Outperforms Quartz

Better Quality, More Robust

Millions of Configurations

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SiTime – Better Quality, More Robust
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SiTime – Millions of Configurations

 

Immune to Vibration

Better Noise Rejection

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SiTime – Immune to Vibration
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SiTime – Better Noise Rejection
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