LMK04803BISQX/NOPB

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The LMK04803BISQX/NOPB is a low-power, wideband clock generator with a frequency synthesizer from Texas Instruments. The device combines a low-power frequency synthesizer, a divider, and a reference clock input to generate high-bandwidth frequency from a single reference clock. It enables synchronization of multiple signals and provides a broad selection of frequency and phase shifted outputs with minimal power.

This clock generator is suitable for a range of applications, including backplanes, wireless systems, networking applications, medical imaging and communication systems. It can also be used to derive clocks and data for a number of cell phone baseband processors. The LMK04803BISQX/NOPB is designed to reduce external components and system complexity, ultimately reducing bill of material cost.

Working Principle

The LMK04803BISQX/NOPB is a fully integrated clock synthesizer with two out-of-the-box PLLs, a divide–by–N counter, a numerically controlled oscillator (NCO), and 7 outputs. The device accepts an external reference clock from 4 to 212 MHz and uses an internal loop filter and prescaler to generate frequencies from 312 kHz to 212 MHz. It also has arbitrary phase shifting capability to synchronize clocks at multiple output frequencies.

The built-in PLL circuit comprises a voltage-controlled oscillator (VCO), a low-pass filter, and a phase-frequency detector (PFD). The divider can be enabled or disabled to divide the VCO frequency by 2/3/4/6/8/12/16/24, depending on the ATEN setting. The device then creates multiple frequencies using its NCO, divider, and PLLs. The output frequency is a product of its VCO and the divider, and can be tuned by varying the reference frequency.

When the REF_SEL pin is logic high, the reference clock can be applied to the device. The device then uses fractional-N synthesis to vary the frequency of the VCO. When the reference clock is lower than 49 MHz, the device uses an internal programmable loop filter to generate its output frequencies. When the reference clock is higher than 49 MHz, the device uses an external loop filter instead. The device also contains an internal oscillator that can be used as a low-power backup clock in the event that there is no external reference clock present.

Features and Benefits

The LMK04803BISQX/NOPB offers several features and benefits. It provides a high level of integration, reducing the need for external components and the resulting system complexity and lowering cost. The device also has a low power consumption of less than 11 mW, enabling designers to reduce total power consumption in applications. The device has an adjustable output triangle amplitude. This feature minimizes impact from the external loop filter and enables heavy filtering if necessary. The device also incorporates an output disable/enable feature that allows frequency updates without losing synchronization.

The device also offers frequency flexible outputs. The frequency can be adjusted at runtime, so users can adjust the output frequency and the duty cycle to achieve a best-fit solution for their applications. The device also has low jitter, enabling it to generate clocks with high accuracy and stability for high-frequency applications. Finally, the LMK04803BISQX/NOPB is a RoHS-compliant device.

Conclusion

The LMK04803BISQX/NOPB is a low-power, wideband clock generator with a frequency synthesizer from Texas Instruments. It combines a low-power frequency synthesizer, a divider, and a reference clock input to generate high-bandwidth frequency from a single reference clock. The device is suitable for backplanes, wireless systems, networking applications, medical imaging and communication systems, or cell phone baseband processors. It features a high level of integration, low power consumption, adjustable output amplitude, frequency flexible outputs, and low jitter. The device is also RoHS-compliant.

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