LMK04610RTQR

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The LMK04610RTQR is a low jitter, dual stage, wideband frequency synthesizer. It is a member of the LMK04600 family of timing solutions and provides fine frequency tuning resolution. This application note provides an overview of the LMK04610RTQR and its components, an introduction to its use in circuit applications and an overview of the working principle.

The LMK04610RTQR is an ideal solution for use in designs requiring high frequency flexibility and low jitter operation. Its silicon-proven architecture offers advantages over discrete and traditional voltage-controlled solutions in terms of ease of use and manufacturability. The integrated solution also reduces costs and board space, compared to discrete designs, while eliminating signal integrity issues associated with traditional voltage-controlled solutions.

At the core of the LMK04610RTQR is a dual-band VCO that provides frequency synthesis capabilities ranging from 10 MHz to 7.2 GHz. The VCOs provide high-frequency flexibility without compromising performance. The synthesizer core provides precise and stable frequency tuning over multiple ranges that can be increased with fractional-N or integer-N combining. Additionally, the main VCO frequency is divided by a single programmable divider and buffered output, giving the device its wide tuning range.

The device supports tuning resolution as low as 2.5 ppb (Parts Per Billion) across the entire frequency range, making it ideal for applications that require precise frequency or phase control. Additionally, the synthesizer has a low jitter architecture which provides clean jitter performance, even at low frequencies. The high frequency capability is complemented by high level design features such as integrated reference dividers and automatic operation mode. This ensures consistent performance, even when performing high-accuracy lock operations.

The LMK04610RTQR is typically used in clock and timing applications such as frequency divider and frequency synthesis. In addition to this, the device can be used in a variety of applications including frequency conversion, clock and data synchronisation, RF signal distribution and test instrumentation. This wide ranging application flexibility is achieved by its unique combination of programmability and low jitter performance.

The working principle of the LMK04610RTQR involves a combination of a dual-band voltage controlled oscillator (VCO) and a programmable divider. The dual-band VCO implements two separate independent VCOs; a low-frequency (LF) VCO and a high-frequency (HF) VCO. The primary purpose of the dual-band VCO is to be able to synthesize a wide range of frequencies from 10 MHz to 7.2 GHz. The voltage control input to the VCO (VC) is programmable, allowing for precise and stable frequency tuning over the entire frequency range.

The programmable divider is used to divide the output of the dual-band VCO. This division is precisely controlled by a programmable counter, allowing for finer resolution and frequency precision over a wide range of frequencies. The division ratio of the programmable divider is set via the frequency tuning register (FTR). The output of the programmable divider is then buffered and presented to the output through an output divider, allowing for further frequency tuning resolution.

The LMK04610RTQR also includes additional features such as the integrated reference divider, programmable clock mode and an on-chip voltage regulator. These features enable advanced clock and timing operations, making the LMK04610RTQR suitable for a variety of purposes including frequency conversion, clock and data synchronisation, RF signal distribution and test instrumentation.

In summary, the LMK04610RTQR is a low jitter, dual-stage, wideband frequency synthesizer. It is a member of the LMK04600 family of timing solutions and provides fine frequency tuning resolution. The device supports tuning resolution as low as 2.5 ppb across the entire frequency range and features a low jitter architecture which provides clean jitter performance. It is typically used in clock and timing applications such as frequency divider and frequency synthesis and can additionally be used in a variety of other applications due to its flexibility and wide ranging application capabilities.

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