PWM clock
16 February 2011
Electronics Technology
New from Linear Technology is the LTC6992 silicon oscillator, the latest member of the TimerBlox family of silicon timing devices.
The IC offers simple and accurate pulse width modulation (PWM) capability for output frequencies from 3,81 Hz to 1 MHz. Its frequency is programmed using one to three resistors, with guaranteed frequency error less than 1,7%. In addition, the frequency can be dynamically controlled via a separate control voltage. The output pulse width (duty cycle) is simply controlled with an analog signal from 0 to 1 V. The LTC6992 offers glitch-free, first cycle accurate startup within 500 μs of power-on.
Four versions of the device are available, each offering a unique combination of minimum/maximum duty cycle limits. The minimum duty cycle can be 0% or 5%, and the maximum duty cycle limit can be 95% or 100%. The 5% and 95% duty cycle limits ensure that the output will continue to toggle, irrespective of the control voltage, for applications unable to tolerate a DC control signal. The LTC6992 is well suited for heater control, PWM servo loops, LED dimming, signal isolation and other duty cycle control applications.
The 20 mA source and sink capability enables direct drive of optoisolators and transformers for electrical isolation. Fully specified over the temperature range of -40°C to 125°C, the TimerBlox parts are suitable for demanding automotive and industrial environments where many oscillators and microcontrollers are unable to operate. The small SOT23 footprint allows each timing device to be placed at the point of use, without routing signals over long distances, and provides an ideal timer for space-limited applications such as handheld and portable devices.
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