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Thermal Controller

A crystal thermal controller ASIC developed with a leading defense provider to enable ultra-precise time and frequency generation.

ASIC success story

Application

It is well known that most methods of frequency generation have significant temperature dependencies. Crystal oscillators are much more stable over temperature than integrated RC oscillators. However, for ultra-precise time and frequency generation, the tempco of the crystal can be mitigated by keeping it at a constant temperature. CSS partnered with a leading defense provider to develop a crystal thermal controller to enable ultra-precise time and frequency generation.

At a glance

Maximum power15W (15V, 1 Amp)

Set temperature65°C – 125°C

Interface1-Wire serial

MarketAerospace & Defense

Custom solution from CSS

This custom ASIC incorporates the heating element, temperature sensor and error amplifier into one integrated circuit. An internal DAC and EEPROM set the temperature. A 15V power FET acts as the heating element. The maximum current is programmable and stored in the EEPROM.

Die layout of the crystal thermal controller ASIC
Die layout

Key features

  • 15W Maximum Power (15V, 1 Amp)
  • Internal Temperature Sensor
  • DAC Sets Temperature (65°C – 125°C)
  • Current Limit = 0.1A to 1.0A (16 steps)
  • 1-Wire Serial Interface
  • Temperature Range = -40°C to +125°C

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