BCM3419_06 Datasheet, PDF (2/2 Pages) Broadcom Corporation. – ADVANCED LOW IF DIRECT CONVERSION CABLE TUNER

OVERVIEW
BCM3419 Block Diagram
The BCM3419 is a highly integrated, advanced direct conversion,
single-chip silicon tuner. It integrates the global tuning function,
including selectivity, and supports 64-QAM, 256-QAM, and 1024-QAM
digital cable modem applications. The input signal is first driven to the
LNA with wideband AGC and then filtered and fed to the image
rejection mixer. The LO signal feeds the second input of the mixer which
downconverts the RF signal to a low 4-MHz IF frequency. The IF signal
is then filtered (channel selectivity) and shaped to be connected to the
channel decoder inputs. There is no need for an external SAW filter.
Additionally, the VCO (Voltage Controlled Oscillator) is fully integrated
with no external tank component.
alternative to traditional can tuners. Its low-power operation is suited
well for applications that require battery backup and capability such as
VoIP cable modems.
The BCM3419 supports an IF output frequency range of 4 MHz, 4.5
MHz, and 5 MHz, enabling one device to support both DOCSIS and
EuroDOCSIS standards.
Extreme care was taken to develop proven reference designs that both
reduce cost and provide a platform that increases the speed of product
development. Minimal in-house RF expertise is required to quickly
develop and produce low-cost cable modems.
The BCM3419 is specifically designed for use with Broadcom’s
industry-leading single-chip cable modem devices. With a low BOM
cost and a proven reference design, the BCM3419 provides a better
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BROADCOM CORPORATION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
© 2006 by BROADCOM CORPORATION. All rights reserved.
3419-PB03-R
07/19/06
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