DS1099U-TJ+

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The DS1099U-TJ+ is a reliable and precise clock generator, PLL, frequency synthesizer and programming device for various digital system applications. It employs a unique combination of a low jitter and low phase noise oscillator circuit and an advanced design and implementation of a high performance programmable frequency synthesizer. This clock generator and PLL are ideal for a range of applications, including digital televisions, portable media players and digital A/V receivers.

The DS1099U-TJ+, from Dallas Semiconductor, provides precise clock generation with a very low jitter of 0 - 5ps, depending on the frequency, making it suitable for a wide range of commercial and industrial applications. This low jitter oscillator also enables the device to be used as a programmable oscillator, as the precise and stable output frequencies can be programmed using an I2C or serial interface.

The DS1099U-TJ+ features an extremely low phase noise of -145dBc/Hz @ 10 kHz, an integrated crystal oscillator, an internal PLL, and an output control circuit. The device supports up to three clock outputs, with each output having a programmable output voltage, which is adjustable from 1.8V to 3.3V. The device has a wide frequency range of 10MHz to 10GHz and a wide operating temperature range of -40ºC to 85ºC.

The DS1099U-TJ+ also incorporates a flexible PLL structure, which allows users to program the device to achieve specific clock and data rates required by their design. The PLL can be programmed to automatically select the correct output frequency, even if the input frequency is changed. The device also supports I2C or serial programming and has 256 programmable registers to tune the desired frequency.

In operation, the DS1099U-TJ+ utilizes a fixed frequency oscillator, which is divided down through a programmable divider, to generate the desired output frequency. The programmable divider is controlled by the PLL, which initiates clock cycles, adjusts the frequency, and then generates a feedback signal to the input of the frequency divider. This feedback signal is used to adjust the divider and ultimately generate the desired output frequency.

The DS1099U-TJ+ also features a dedicated power-down control pin, which allows users to turn the device off when not in use. This power-down feature helps to conserve power, thus ensuring lower power consumption when the device is not in use. The DS1099U-TJ+ also has an auto-boot feature, which enables the device to automatically initiate the boot sequence once power is applied.

The DS1099U-TJ+ is a reliable and precise clock generator, PLL, frequency synthesizer, and programming device for use in a range of digital system applications. Its low jitter and low phase noise design, combined with its wide frequency range, makes this device ideal for a variety of applications including digital television, portable media players, and digital audio-video receivers. This clock generator and PLL are also capable of making the necessary adjustments to output voltage and frequency in order to achieve the desired data rates.

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