Description:The 843002-01 is a 2 output LVPECL synthesizer optimized to generate Ethernet reference clock frequencies. Using a 25MHz 18pF parallel resonant crystal, the following frequencies can be generated based on the 2 frequency select pins (F_SEL[1:0]): 156.25MHz, 125MHz, and 62.5MHz. The 843002-01 uses ICS' 3rd generation low phase noise VCO technology and can achieve 1ps or lower typical rms phase jitter, easily meeting Ethernet jitter requirements. The 843002-01 is packaged in a small 20-pin TSSOP package.
Renesas provides a recommended PCB layout guide in their application note (AN1844) for the 843002AG-01LFT, which includes guidelines for thermal vias, copper pours, and component placement to minimize thermal resistance and ensure reliable operation.
To ensure reliable operation in high-temperature environments, it's essential to follow Renesas' guidelines for thermal design, including using a heat sink, thermal interface material, and ensuring good airflow. Additionally, consider using a thermistor or temperature sensor to monitor the device temperature and implement thermal protection mechanisms.
Renesas recommends following the JEDEC J-STD-020D.1 standard for soldering conditions, which specifies a peak temperature of 260°C, a dwell time of 30-60 seconds, and a soldering iron temperature of 350-370°C. It's also essential to use a solder with a melting point above 217°C to ensure reliable joints.
While the 843002AG-01LFT is designed to be robust, it's still important to follow Renesas' guidelines for vibration testing and ensure that the device is properly secured to the PCB using a suitable mounting method, such as a screw or adhesive. Additionally, consider using a vibration-dampening material or potting compound to reduce the impact of vibrations.
Renesas provides a troubleshooting guide in their application note (AN1845) for the 843002AG-01LFT, which covers common issues such as over-temperature shutdown, under-voltage lockout, and output voltage regulation. Additionally, consider using a logic analyzer or oscilloscope to debug the device's behavior and identify potential issues.
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843002AG-01LFT Overview
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