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 SiT8945 60 to 220 MHz	±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 SiT9347 220 to 725 MHz	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 SiT3542 220 to 725 MHz	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 SiT5147 1 to 60 MHz	±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 SiT5347 60 to 220 MHz	±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 SiT5349 60 to 220 MHz	±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

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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Immune to Vibration	Better Noise Rejection
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Downhole Instrumentation