Automotive Cameras

the left-hand car rear view camera

Automotive camera modules present several design challenges. Board space is constrained. Environmental conditions include extreme temperatures, fast temperature changes, shock, vibration, and electromagnetic interference. Increasing sensor resolution means higher data rates, which requires low jitter clocking.

SiTime MEMS-based oscillators meet these challenges. They offer small size, accuracy over temperature from -55 to 125°C (even with fast temp ramp), low jitter, resilience to shock and vibration, and EMI reduction features. Our devices have higher quality and reliability, with a FIT rate that is up to 50x better than quartz crystal devices to help systems meet functional safety metrics targets.

Download Application Brief

SiTime MEMS Timing Benefits

Complete MEMS clock tree

Spread spectrum oscillators

Low jitter differential oscillators

32.768-kHz XOs and TCXOs

Precision TCXOs

Most robust in real world conditions

150 fs rms jitter, excellent PSNR

Resistant to shock and vibration

Stable over wide temperature

2.2 billion hours MTBF

Integrated MEMS, easy to use

No quartz reliability issues

Reliable startup in cold temp

No cover or shielding needed

Short lead time for any frequency

Automative Camera Block Diagram

Cameras are built around an imager, of varying resolution depending on the camera’s purpose. After some processing, the data stream is sent to the vehicle’s ADAS computer by means of a serial interface. The most common kinds of PHY are MIPI A-PHY (Valens), FPDLink (TI), and GMSL (Analog Devices). Both imager and PHY require a high quality, low jitter clock to operate.

Cameras are usually complemented with radar, lidar and infrared sensors.

See also the Application Brief on ADAS Computer.

MEMS Timing Solutions for Automotive Camera

Devices Key Features Key Values
Single-ended Oscillator
SiT8924  1 to 110 MHz
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  • Up to -55°C to +125°C
  • ±20 ppm stability
  • 2016, 2520, 3225 packages
  • High reliability
  • Extended temperature range
  • Small footprint
Single-ended Oscillator
SiT9025  1 to 110 MHz
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  • Up to -55°C to +125°C
  • Spread spectrum
  • Configurable rise / fall times
  • 2016, 2520, 3225 packages
  • High reliability
  • Extended temperature range
  • EMI Reduction
Differential Oscillators
SiT9396  1 to 220 MHz
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SiT9397  220 to 920 MHz
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  • Low jitter: < 150 fs RMS [1]
  • ±30, ±50 ppm stability over -40 to +125°C
  • LVPECL, LVDS, HCSL, Low-power HCSL, FlexSwing™
  • 2016, 2520, 3225 packages
  • High reliability
  • Low jitter
  • Enables interfaces with demanding jitter requirements, such as PCI-Express and 10 GB Ethernet
SiT5386  1 to 60 MHz
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SiT5387  60 to 220 MHz
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  • ±0.1, ±0.2, ±0.25 ppm stability over -40 to +125°C
  • ±1 ppb/°C frequency slope
  • Low jitter: 0.31 ps RMS [1]
  • Optional voltage or digital frequency control
  • High accuracy
  • Excellent frequency stability with fast temp gradients
  • No GNSS signal loss or V2X disconnect due to micro-jumps

1 12 kHz to 20 MHz integration range

Key concerns of designers

  • Reliability
  • Functional safety
  • High temperature requirements
  • Fast system startup time required (usually < 100 ms)
  • EMI


SiTime advantages

All SiTime devices offer the following advantages over quartz crystals, which are particularly important for Automotive applications:

  • Up to 50x better reliability: Apart from reducing the amount of field failures, the better reliability translates into a lower FIT rate. This provides better Hardware Safety metrics in an FMEDA, the quantitative analysis required as part of a Functional Safety assessment.
  • Up to 100x better resilience to shock, vibration and electromagnetic interference, due to the smaller size (0.4 x 0.4 mm) and lower mass of MEMS resonators compared to crystals.
  • Better frequency stability (down to ±100 ppb) and frequency response to temperature changes dF/dT (down to < 3.5 ppb/°C). These characteristics provide better locking to GNSS and V2X, and reduced connection drops.
  • SiT9025 features EMI reduction features: spread spectrum and configurable rise/fall times

MEMS Timing Outperforms Quartz

Higher Quality

Higher Reliability

 SiTime – Higher Quality
SiTime timing devices are up to 50x more reliable than legacy quartz


Tighter Stability

Better EMI Reduction

SiTime – Tighter Stability
SiTime – Better EMI Reduction


Immune to Vibration

Better Noise Rejection

SiTime – Immune to Vibration
SiTime – Better Noise Rejection
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