BCM3125 ETC, BCM3125 Datasheet

BCM3125

Manufacturer Part Number

BCM3125

Description

UNIVERSAL TRANSMISSION SOLUTION

Manufacturer

ETC

Datasheet

1.BCM3125.pdf (2 pages)

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BCM312 5

•

Tuner

Integrated QAMLink

•

Integrated QPSK out-of-band receiver

•

Integrated upstream transmitter

•

Control unit

•

160-pin PQFP package

10-bit A/D converter with input AGC amplifier

Variable symbol rate 256-QAM receiver

Digital demodulator, Nyquist filters, tracking loops,

and 32-tap adaptive decision feedback equalizer

ITU-T J.83 Annex A/B/C compatible FEC decoder

Baseband interface to dual 6-bit A/D converters or IF

interface to signal A/D converter

Variable symbol rate QPSK receiver

Digital demodulator, Nyquist filters, tracking loops,

and 4-tap adaptive decision feedback equalizer

DigiCipher

MPEG transport output interface/DAVIC MAC

output interface

Programmable Starvue

II/DOCSIS™/EuroDOCSIS™/DVB/ DAVIC FEC

encoder

Pre-equalization filter

Up to 6 MBaud variable rate QPSK/16-QAM modulator

10-bit D/A converter with output power control

interfaces

BSC/SPI compatible interface for configuration and

device control

RF tuner control

B C M 3 1 2 5

Out-of-Band Channel

Upstream Channel

In-Band Channel

II/DVB/DAVIC FEC decoder

QAMLink

in-band receiver

F E A T U R E S

BCM3125

Transmission

QAMLink

Universal

Solution

UNIVERSAL TRANSMISSION SOLUTION

Set-Top Box Block Diagram

PRODUCT

I/O

•

Universal set-top and cable modem front-end

supports the ITU-T J.83 Annex A/B/C standards, as

well as OpenCable™, DOCSIS/EuroDOCSIS, and

DVB/DAVIC

Connects directly to Broadcom digital TV ICs

supporting physical layer requirements including

out-of-band

Represents a complete solution for dual

downstream channels (in-band and out-of-band) and

the upstream channel

Integrated analog front end for the dual downstream

and upstream blocks reduces board complexity and

system costs

Serial control interface results in reduced overall pin

count

Out-of-band QPSK receiver provides flexibility for

IF or baseband inputs

Single, low-cost crystal solution eliminates costly

VCXOs

Includes direct interface to the OpenCable point-of-

deployment (POD) module

Single device supports both 6-MHz and 8-MHz

channels

Allows direct connection to Broadcom ICs to support

additional data and video channels for

DOCSIS/EuroDOCSIS/DAVIC systems and PVR set-

top boxes

S U M M A R Y

BCM312 5

Brief

High Definition Video /

Graphics Subsystem

BCM7020/BCM7030

O F

Memory

B E N E F I T S

CPU

Audio

Video

Related parts for BCM3125

BCM3125 Summary of contents

Page 1

... UNIVERSAL TRANSMISSION SOLUTION ® • • • • • • • • • • Set-Top Box Block Diagram BCM3125 QAMLink ® Universal Transmission Solution I/O BCM312 5 Brief Brief Universal set-top and cable modem front-end supports the ITU-T J.83 Annex A/B/C standards, as well as OpenCable™ ...

Page 2

... MHz. A 10-bit D/A then converts this signal to an analog waveform with programmable output power levels. ® II, DOCSIS/EuroDOCSIS The BCM3125 includes an BSC/SPI interface for setup and control by the host processor. In addition tuner controller is also provided. are trademarks of ® Nyquist Starvue II = ...

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