DSC400-0401Q0103KE2T

DSC400-0401Q0103KE2T: Pin Configurable/Selectable Oscillators

The DSC400-0401Q0103KE2T is a pin configurable/selectable oscillator engineered to offer exceptional frequency accuracy, extremely low phase jitter, and outstanding power supply rejection (PSR) capabilities over a wide frequency range. It is a complete oscillator comprising a Frequency Pull Range+/-50ppm, an oscillator frequency control pin, an enable pin, and a 0.1pF compensation capacitor for programming.

Application Field

The DSC400-0401Q0103KE2T is ideal for applications that require very high levels of frequency accuracy in the 1MHz to 100MHz range. Typically, it is used for system timing and timing distribution services, such as embedded clock management, clock synchronization, and system jitter attenuation. It is also designed to serve as a clock source for numerous computing, communications, consumer electronics, automotive, and industrial applications.

Working Principle

The device is an oscillator featuring a differential PECL enable pin and a frequency control pin. The enable pin, which is configured and connected in differential mode, allows the device to be activated and deactivated as needed. When enabled, the unit starts running and produces a free-running oscillation. The frequency of the oscillation is determined by the frequency control pin. The control pin consists of a capacitor which determines the frequency of the oscillation by changing the time constants.

The core of the device is based on a temperature-compensated voltage-controlled oscillator (TCVCXO) with a frequency pull range of +50ppm to -50ppm. It uses an oscillator circuit that utilizes a quartz crystal, bias network, and crystal load capacitor to generate the oscillation. The frequency of the oscillation is determined by the frequency control pin and is digitally adjustable to within +/-50ppm for left/right setting accuracy.

The device also incorporates an enable pin, which is connected to ground through a 0.1pF capacitor. This pin provides the user with the option of enabling and disabling the oscillator via start/stop signals. The enable pin is connected to the differential enable circuitry to enable the device upon power up. The enable pin is also used to indicate start/stop conditions.

The combination of the enable pin and the frequency control pin makes it possible to program the device to the desired frequency. The user can easily select the correct frequency by connecting a single capacitor to the frequency control pin. The combination also allows the user to adjust the frequency slightly for precision or environmental factors.

In addition, the device offers an excellent power supply rejection ratio (PSR) over the entire operating frequency range, which ensures superior output signal quality in noisy applications. The device also features a wide operating supply voltage range of 1.4V to 5.5V and operates over the extended temperature range of -40°C to 85°C.

Conclusion

The DSC400-0401Q0103KE2T pin configurable/selectable oscillator offers an excellent combination of frequency accuracy, low phase jitter, and PSR. It is designed for applications that require very high levels of frequency accuracy in the 1MHz to 100MHz range. It provides the user with a wide selection of frequencies and the ability to adjust the frequency with a single capacitor. The device is also equipped with an enable pin and offers superior PSR in noisy applications.