Broadcom Corporation - BCM3420 - Low-Power Direct Conversion Cable Tuner

The BCM3420 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 down converts the RF signal to a low 4 MHz IF frequency. The IF signal is then filtered (channel selectivity) and shaped to be connected to fit 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 BCM3420 is specifically designed for use with Broadcom's industry leading single chip cable modem and set-top box devices. With a low BOM cost and a proven reference design, the BCM3420 provides a better alternative to traditional CAN Tuners Its low power operation is suited well for applications that require battery backup capability such as VoIP cable modems. With an RF splitter, the BCM3420 pass-through mode is ideal for use in multi-tuner applications.
By Broadcom Corp.
BCM3420 's PackagesBCM3420 's pdf datasheet



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BCM3420 Application circuits
BCM3420 circuits
This is one application circuit of BCM3420,If you need more circuits,please download BCM3420's pdf datasheet.


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