LTC6930CDCB-5.00

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The LTC6930CDCB-5.00 is part of a family of products developed for Clock/Timing - Programmable Timers and Oscillators category. It is an integrated voltage controlled oscillator and programmable timer that combines the flexibility of a voltage controlled oscillator (VCO) with the convenience of a programmable timer. The LTC6930 utilizes a single resistor to establish the operating frequency, providing a simple, cost effective solution for a wide range of frequency control applications.

The LTC6930 is generally deployed as a replacement for conventional crystal oscillator based timing circuit, and is applicable for low voltage (down to 1.5V) and high frequency requirements in many areas. It features a wide frequency range of 24kHz up to 80MHz and a maximum resolution of 0.1%.

Application

The LTC6930 is most often used in frequency synthesizer applications, requiring both low phase noise performance and high precision frequency control. Such places include communications and network products, as well as spectrum analyzers and automated testing systems. As a voltage controlled oscillator, its frequency control can provide agility as well as fast alignment and synchronization.

The LTC6930 is well suited for many demanding timing requirements, such as in filters, mixers, and radios. It can be employed in digital-to-analog and analog-to-digital conversion architectures, for applications such as ultrasound systems, telecommunications, and medical instruments.

Working Principle

The LTC6930 is a voltage controlled oscillator with a single resistor price programmable frequency range. The chip consists of a low power, low noise, wideband current-starved oscillator together with an associated Voltage Controlled Oscillator (VCO) buffer. The VCO is connected to the R SET resistor that program the frequency range of the oscillator. It can accurately control the frequency from 24kHz up to 80MHz .

The current-starved oscillator used in the LTC6930 consists of an active circuit element, an operational transconductance amplifier (OTA), —often referred to as a “current-starved loop.” An external capacitor and a variable resistor, R SET , forms an LC tank circuit with the OTA, and the VCO is driven by the current-starved OTA. The main advantage of a current-starved oscillator is that the spectral noise introduced by the oscillator core is negligible compared to the thermal noise of components in the loop filter.

When modulating the frequency, the R SET resistor is adjusted, creating a frequency shift in the oscillator. According to Ohm’s law, the resistance, when given a certain voltage, is equal to the voltage divided by the current. When the voltage applied to the VCO buffer, the current flowing through R SET is proportional to the voltage and causes the frequency of the oscillation to shift inversely with the resistance over a given range. This makes it easy to adjust and control the frequency, as the voltage can easily be programmed to a specific range.

Conclusion

The LTC6930 is an integrated voltage controlled oscillator and programmable timer that is optimized for frequency synthesizer applications and offers a wide frequency range from 24kHz up to 80MHz with a maximum resolution of 0.1%. With its cost effectiveness and the simplicity of needing only a single resistor to program its frequency range, the LTC6930 is an ideal solution for most applications needing a voltage controlled oscillator.

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