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BCM3419
(R)
ADVANCED LOW IF DIRECT CONVERSION CABLE TUNER
FEATURES * Single-chip direct conversion silicon tuner completes system
design with Broadcom cable modem * DOCSIS(R)/EuroDOCSISTM 1.0/1.1/2.0 * Supports 64, 256, and 1024 QAM
SUMMARY OF BENEFITS * Extreme integration level leads to highly cost-effective BOM * Eliminates significant external components:
* SAW (Surface Acoustic Wave) IF filters * RSSI measurement components * IF amplifiers * Oscillator components * Package optimization enables low-cost 2-layer system PCB * Minimal in-house RF expertise required
* Input frequency range of 50 MHz through 860 MHz
IF (intermediate frequency) output range of 4 MHz, 4.5 MHz, and 5 MHz * For use in 6-MHz, 7-MHz, and 8-MHz systems * High linearity across entire frequency range
* Support for DOCSIS/EuroDOCSIS 2.0 enables one device
solution to be used worldwide * Superior alternative to can tuners * High quality and reliability (no hand tweaking) * Enables lower profile and smaller designs * Proven reference design for quick time-to-market * Simplified manufacturing flow * Single supply voltage provides low-cost operation
* Differential signals for high noise immunity * Integrated and cost-effective BOM:
* True single-chip tuner * Single 3.3V supply voltage * Fully integrated oscillator * Fully integrated channel selectivity * Symmetrical IF output for direct connection to channel decoder * RSSI (Received Strength Signal Indicator) information provided through I2C bus * Standby mode
* Low-power consumption * APPLICATIONS * Cable Modems * Cable Gateways * Voice Cable Modems
* 40-pin MLF package
Tuner Application Example (Cable Modem)
OVERVIEW
4 ,8 ,1 2 d B
-6 ... 1 4 d B 0 .2 d B ste p s
-2 ... 6 d B RF ba n d-pass filte r s
10 dB
RF -8 ,-4 ,0 d B p o ly p h a se f ilte r
M ix e r
IF p o ly p h a s e filte r
-4 ,-1 ,2 d B
IF lo w - p a ss f ilte r
10... 30 dB
R F in
AGC1 AGC2 GC3 I C ' L ev el c o n tr o l IC ' Level c o n tr o l I C ' I C ' IC ' GC4
f/4
L ev el d e t e c to r
IC '
L ev el in d ic a to r
I C '
N = 1 ,1 .5 ,2 ,4 ,8 f/N
I C '
S y n t h e s ize r
I C '
C o ntro l
Freque ncy c o n tr o l
X tal o sc illa t o r
IC
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. 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 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.
Broadcom(R), the pulse logo, and Connecting everything(R) are trademarks of Broadcom Corporation and/ or its subsidiaries in the United States and certain other countries. All other trademarks mentioned are the property of their respective owners.
(R)
BROADCOM CORPORATION 16215 Alton Parkway, P.O. Box 57013 Irvine, California 92619-7013
(c) 2004 by BROADCOM CORPORATION. All rights reserved. 3419-PB02-R 10/15/04
Phone: 949-450-8700 Fax: 949-450-8710 E-mail: info@broadcom.com Web: www.broadcom.com

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