5G Technology World

  • 5G Technology and Engineering
  • Apps
  • Devices
  • IoT
  • RF
  • Radar
  • EE Learning Center
  • 5G Videos

Low-power TCXO improves IoT battery life

By Martin Rowe | March 17, 2021

The SiT5008 from SiTime goes to 60 MHz, draws 3.5 mA, and features a standby mode.

Battery-powered devices — including those that connect to wireless networks — always benefit from longer battery life. Every component that uses power drains batteries, and that include oscillators. The SiT5008 temperature-compensated silicon MEMS oscillator (TCXO)draws just 3.5 mA (typical) while providing clock frequencies from 1 MHz to 60 MHz, programmed at the factory based on ordered part number. Output frequencies are specified as accurate to within six decimal places. The has three operating voltages (1.8 V, 2.8 V, 3.3 V) that you specify at time of ordering. Frequency stability is ±2 ppm to ±10 ppm.

In addition to specifying operating voltage and frequency, you must specify output drive and a control pin’s function. An oscillator’s signal rise and fall times present a design tradeoff between jitter and EMI because of the harmonics in signal edges. Slower edges reduce emissions while faster edges reduce jitter. In addition to specifying output frequency and operating voltage, you must specify the device’s drive strength based on the desired rise time, power-supply voltage, and capacitive load. The plot below shows the harmonic amplitude as a function of harmonic number for several rise times.

Harmonic energy drops with higher harmonics.

The SiT5008 has an OE/ST/NC control pin where you specify that pin’s function when ordering. As an output enable, you control the SiT5008’s output (active or high-Z) but the device remains active. If configured as a standby pin, the control pin puts the device in a sleep mode. You can also specify the pin to have no function.

Comments

  1. Martin Rowe says

    March 23, 2021 at 4:54 pm

    SiTime has released the SiT8008, which operates at frequencies to 110 MHz. Operating voltages cover 1.8 V, 2.5 V to 3.3 V, and 1.8 V to 3.3 V.
    https://www.sitime.com/products/lvcmos-oscillators/sit8008

    SiTime also offers a programming unit for its field programmable oscillators SiT5008 and SiT8008.
    https://www.sitime.com/time-machine-oscillator-programmer

    Reply

Tell Us What You Think! Cancel reply

Related Articles Read More >

TMicroelectronics B-L462E=CELL1 Discovery Kit
Development kit connects to cellular networks
IoT connectivity: 4G or 5G?
IoT: How 5G differs from LTE
Innophase Wi-Fi Bluetooth modules
Wi-Fi/Bluetooth modules offer pad or chip antennas

Need 5G Technology World news in a minute?

We Deliver!
5G Technology World Enewsletters get you caught up on all the mission critical news you need. Sign up today.
Enews Signup

EE World Online Twitter

Tweets by @RandDWorld

EE TRAINING CENTER CLASSROOMS

“ee

“ee

“ee

“ee

“ee
5G Technology World
  • Enews Signup
  • Contact Us
  • EE World Online
  • DesignFast
  • EDABoard Forums
  • Electro-Tech-Online Forums
  • Microcontroller Tips
  • Analogic Tips
  • Connector Tips
  • Engineer’s Garage
  • Power Electronic Tips
  • Sensor Tips
  • Test and Measurement Tips
  • Wire & Cable Tips

Copyright © 2021 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search 5G Technology World

  • 5G Technology and Engineering
  • Apps
  • Devices
  • IoT
  • RF
  • Radar
  • EE Learning Center
  • 5G Videos