bcm3418 Broadcom Corp., bcm3418 Datasheet
bcm3418
Manufacturer Part Number
bcm3418
Description
Bcm3418 - Direct Conversion Cable Tuner
Manufacturer
Broadcom Corp.
Datasheet
1.BCM3418.pdf
(2 pages)
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* = For use only in applications where the input frequency to the
diplexer is less than 1000 MHz.
Supports 64 and 256 QAM
High linearity to support digital, analog, and terrestrial tuner
applications
Input frequency range of 50 MHz through 860 MHz *
IF output range of 36 MHz and 44 MHz
Ultra low-phase noise
Crystal output (24 MHz): Cascade with other BCM3418
Build-in Autonomous AGC
Differential signals for high noise immunity
Fine-tuning step size (6 kHz minimum)
Eliminates need for image reject mixer
• Minimal BOM with reference designs available
• IF AGC and frequency synthesizers included
• Standard logic CMOS with single 3.3V supply
• 48-pin TQFP
Highly integrated and cost-effective
ADVANCED DIGITAL AND ANALOG CABLE TUNER
50-860 MHz
F E A T U R E S
Diplex
Filter
®
50-860 MHz
Tuner Application Example (Cable Modem)
BCM3402/3/5
BCM3431
LNA
5-65 MHz
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BCM3418
Narrowband first IF eliminates processing of unnecessary
channels
Supports Docsis 1.1/2.0 power calibration requirement
Meets OpenCable STB requirement
Minimal in-house RF expertise required
Superior alternative to can tuners
• High quality and reliability (no hand tweaking)
• Enables lower profile and smaller designs
• Simplified manufacturing flow
• Lower BOM cost
Applications
• Cable modems
• Cable set-top boxes
• Terrestrial
SAW
CMOS Tuner
NB
BCM3418
S U M M A R Y O F B E N E F I T S
SAW
SDRAM
BCM3348
BCM70xx
BCM7038
FLASH
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bcm3418 Summary of contents
Page 1
... Input frequency range of 50 MHz through 860 MHz * • IF output range of 36 MHz and 44 MHz • Ultra low-phase noise • Crystal output (24 MHz): Cascade with other BCM3418 • Build-in Autonomous AGC • Differential signals for high noise immunity • Fine-tuning step size (6 kHz minimum) • ...
Page 2
... BCM3431 LNA, with build-in RF AGC, are the companion parts of the BCM3418. These two-chip solutions support digital/analog cable and terrestrial tuner applications. The BCM3418 and a compatible LNA are specifically designed to work with Broadcom’s industry-leading BCM70xx single-chip advance set- top box, BCM7038 highly-integrated single-chip HDTV, and BCM33xx cable modem chip ...