SY89537LMY

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The SY89537LMY clock and timing generator from Microchip Technology is a programmable clock synthesizer and jitter cleaner with five independent output clocks. Each of these output clocks can be independently adjusted from 6 to 100 MHz, including frequencies between 91 and 135 MHz which can be used for SONET/SDH and SAS applications. Additionally, the SY89537LMY offers integrated linear regulators to provide clean voltage when powering the device and to reduce external components and board space.

Overview

The SY89537LMY synthesizer is a single chip, low-power CMOS clock generator designed to produce a maximum of five low jitter clocks in the 6-125 MHz frequency range. Each of the output clocks can be independently programmed by the user and the output of each programmable clock is DC-coupled. Output frequencies are selected with a single-wire input bus, which allows the user to express a 16-bit binary value that produces a final programmable frequency.

The SY89537LMY features a low-current LDO (LDO-1) with a selectable output voltage to provide clean power for the output clocks, preventing jitter associated with noisy power supplies. The onboard LDO-2 is utilized to supply stable voltage for the system clock generator, reducing the need for an external regulator. The device provides two low-jitter clock outputs (LJIT1 and LJIT2) that can be used for critical timing applications such as multimedia audio and Ethernet communications.

In addition, the SY89537LMY employs a differential output architecture with external clocking, clock-forwarding and clock-monitoring functions that help provide high accuracy and jitter immunity. The device supports both 3.3V and 2.5V I/O standards and operates across a wide temperature range.

Applications

The SY89537LMY is suitable for a variety of applications, including mobile wireless handsets, wireless base stations, digital video broadcasting, automotive infotainment, harsh environment and ruggedized products, industrial automation, digital media players and servers, Ethernet switches and routers, storage networks, and communications infrastructure systems.

The SY89537LMY is a great choice for applications where external clock sources and clock synthesis are needed. It can also be used to generate a wide variety of clock frequencies accurately and reliably. The device is ideal for providing output clocks for applications with high-frequency requirements and those requiring clean output voltages.

Working Principle

The SY89537LMY acts as an oscillator by continuously generating an output signal at the desired frequency, controlled by two internal oscillator circuits – a Digital PLL (Phase-Locked Loop) and an Analog PLL. The Digital PLL is configured to use the input reference clock and the output of the Analog PLL is used as the feedback for the Digital PLL.

The two PLLs dynamically adjust the phase and frequency of the synthesized signal to match the reference clock. The output frequency is determined by the input frequency, an internal divider, and the value of an on-chip programmable divider. The SY89537LMY includes spread-spectrum and phase-shift modulation functions that allow it to produce output clocks with minimal jitter.

Additionally, the SY89537LMY has a multiplexer which allows it to select between two reference clock frequencies, providing additional design flexibility. The multiplexer also gives users the ability to switch between two different frequencies in a synchronized manner.

Overall, the SY89537LMY is an excellent choice for a variety of applications requiring reliable and accurate clock synthesis, a wide output voltage range, clean power, and minimal jitter. Its wide range of programmable features makes it ideal for applications such as digital video broadcasting, wireless base stations, and industrial automation.

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