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| BCM3418 PRODUCT (R) Brief CABLE OF BCM3418 BCM3418 CMOS FEATURES VoIP TUNER BENEFITS SUMMARY applications * Supports 64 - 256 QAM * Input Noise Figure 12 dB * IP3 = 15 dBm (two tone) * SNR 40 dB * CTB, CSO, Xmod all > 50 dB * PLL Step Size 100 KHz * IF AGC 30 dB Range * 48-Pin TQFP Package * .5W @ 3.3V * The BCM3418 supports 64- and 256-QAM digital cable * Low cost * Complete TV tuner-on-a-chip - requires no external high frequency tuned circuits * Simplifies board layout * Single 3.3V supply * Eliminates microphonics * Differential signals for noise immunity * Surface-mount package simplifies manufacturing * Applications * Cable Modems * VoIP BCM3418 Tuner Application Example (Cable Modem) Diplex Filter 54-860 MHz Discrete LNA BCM3418 CMOS Tuner SAW BCM3300 QAM Rx QPSK/QAM Tx MCNS 1.1 MAC SRAM SDRAM FLASH PA 5-65 MHz LPF BCM3310 MIPS CPU PCI I/F Control PCI BUS BCM3418 OVERVIEW IF AGC PLL The BCM3418 is a complete QAM Digital Cable Tuner-on-achip that supports both 64- and 256-QAM applications. The BCM3418 utilizes a highly integrated version of the single conversion architecture. The input signal is split into three bands, each with a variable bandpass filter and mixer, controlled by a two-wire serial bus that is MBus compatible. The IF amplifier buffers the differential output signal that can directly drive an external SAW filter, where the final channel selection filtering occurs. The IF AGC amplifies the signal returned from the SAW filter over a 30 dB range and buffers the differential output signal. Broadcom(R), the Pulse logo, QAMLink(R), and Connecting everything are trademarks of Broadcom Corporation and/or its subsidiaries in the United States and certain other countries. All other trademarks are the property of their respective owners. (R) (R) BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013 (c) 2003 by BROADCOM CORPORATION. All rights reserved. 3418-PB03-R 06.25.03 Phone: 949-450-8700 FAX: 949-450-8710 Email: info@broadcom.com Web: www.broadcom.com |
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