Patient Monitors

Functional vital functions (vital signs) monitor in an operating room with machines in the background, during surgery on a patient.

Today’s patient monitoring systems monitor an array of biological indicators. Multiple oscillators are required in multiparameter patient monitors, and these timing devices must be reliable and resilient. SiTime MEMS timing solutions provide reliable performance across environmental conditions. They offer EMI resilience, shock and vibration resistance, and power-efficiency for portable systems.

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SiTime MEMS Timing Benefits

Environmentally robust

Excellent stability over temperature

Shock and vibration resistance

EMI resistance

Size and power efficient

Small footprints

Ultra-low power consumption

Drives multiple loads

Easy to use, built to last

Flexible frequency options

No quartz reliability issues

>1 billion hour MTBF

Advancement in technology and the resulting cost reductions have enabled a new breed of patient monitoring systems capable of monitoring multiple parameters such as ECG, oxygen saturation (SpO2), body temperature, respiration rate, blood pressure (BP) and other body functions all through a single system. These systems are ideal for both critical and non-critical care patients, allowing for real time monitoring and documentation of changes in patient conditions.

Multiparameter patient monitors can either be fixed or portable depending on where they are deployed. Fixed or non-portable monitors tend to be larger, come with more advanced features, and are primarily targeted for use in hospitals in ICUs and clinics. Portable units are ideal for use in ambulances, ambulatory surgical centers, and home use.

Multiple oscillators are required in multiparameter patient monitors. At a minimum, one for the ADC and two for the MCU/DSP control board and depending on the communication protocol being used additional oscillators are needed. Portable systems are wireless, and while most currently rely on Wi-Fi, it is expected that once 5G becomes pervasive they will convert to this faster and more reliable protocol.

Patient Monitors Block Diagram

MEMS Timing for Patient Monitors

Devices Key Features Key Values
MHz oscillator
SiT8008  1 to 110 MHz
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SiT1602  52 std freqs from 3.57 to 77.76 MHz
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  • -40°C to +85°C
  • ±20 ppm stability
  • 5 std package sizes
  • High reliability
  • Flexible frequency options
  • Excellent stability over temperature
MHz oscillator
SiT8021  1 to 26 MHz
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  • -40°C to +85°C
  • ±20 ppm stability
  • 1.5 x 0.8 CSP package
  • High reliability
  • Extended temperature range
  • Small footprint
  • Wide programmable frequency range
MHz oscillator
SiT1603 [1] 8 to 76.8 MHz (various specific frequencies)
  • -40°C to +85°C
  • ±25 ppm stability
  • 2 mA current consumption
  • 0.75 fs rms phase jitter
  • High reliability
  • Low power
  • Various standard package options
32.768 kHz oscillator
SiT1811 [1]
  • ±20, ±50 ppm stability
  • 1.14 to 3.3 V supply
  • 490 nA current consumption
  • Up to -40°C to +105°C
  • 1.2 x 1.1 mm QFN
  • Low power
  • Small footprint
  • Excellent stability
32.768 kHz TCXO
  • ±5, ±10. ±20 ppm stability
  • 1 uA current consumption
  • Up to -40°C to +85°C
  • 1.5 x 0.8 CSP package
  • Small footprint
  • Excellent stability

[1] Please contact SiTime for availability

SiTime Advantages

SiTime devices offer the following advantages over quartz, which are particularly important for medical:

  • Factory programmable to any frequency (unless otherwise noted)
  • Higher reliability than quartz
  • Industry-leading small package sizes down to 1508 CSP

MEMS Timing Outperforms Quartz

Higher Reliability

Smallest Size, Lower BOM

SiTime timing devices are up to 50x more reliable than legacy quartz
SiTime MEMS Oscillators – Smallest size, Lower BOM
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