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ACS8947T Datasheet(PDF) 1 Page - Semtech Corporation |
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ACS8947T Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 30 page Revision 1.00/September 2007© Semtech Corp. Page 1 www.semtech.com ACS8947T JAM PLL ADVANCED COMMUNICATIONS FINAL Jitter Attenuating, Multiplying Phase-Locked Loop with Automatic Input Switch and Data Resynchronization Path ADVANCED COMMS & SENSING FINAL DATASHEET The ACS8947T JAM PLL is a general pupose, Integer N, jitter-attenuating, differential phase-locked loop for generating low jitter output clocks. Frequency translation, reference switching between clock inputs and resynchronization features are provided also. Typical application areas include Ethernet, SONET/SDH, PCI, 3G and wireless systems. Typical output jitter generation in a SONET/SDH OC-12 system is 2.8 ps RMS, making the ACS8947T an ideal dejittering solution for use with Semtech clock and line card parts ACS8510, ACS8520, ACS8525, ACS8522, ACS8530 and ACS9510. The ACS8947T has two differential frequency- programmable LVPECL reference inputs and one differential synchronization input. The device is capable of locking across a wide input frequency range of 580 kHz to 180 MHz. Four independently-supplied differential outputs are available, programmable as LVPECL or CML. Each output supports a maximum output frequency rate of up to 625 MHz. All device settings are fully hardwire configured. An external microprocessor is not required to program the PLL. Highly configurable high performance Integer N PLL with integrated VCO. VCO frequency range 2.35 GHz to 2.9 GHz. Configurable closed loop bandwidth from 2 kHz upwards. PLL fully configured by hardwired configuration matrix: no requirement for an external microprocessor. Full control over internal dividers allows the device to be configured for a wide range of frequency translation and jitter cleaning applications. Meets RMS jitter requirements for OC3 and OC12 telecommunications systems. Wide input frequency range of 580 kHz to 180 MHz. Wide output frequency range of 1.23 MHz to 625 MHz. Input activity monitors and lock detector. Automatic or manual control of reference selection. External feedback option. Wide tracking range of 200 ppm. Powerful evaluation board and GUI tool for configuration and device assessment. 3.3 V operation: temperature range - 40°C to +85°C. Small outline, leadless, 7 mm x 7 mm QFN48 package. Figure 1 Simplified Block Diagram of the ACS8947T JAM PLL Block Diagram Introduction Features |
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