- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄373010 > BCM3037 PDF資料下載
參數(shù)資料
| 型號： | BCM3037 |
| 文件頁數(shù)： | 2/2頁 |
| 文件大小： | 35K |
| 代理商： | BCM3037 |
The
BCM3034
QAMLink Universal Modulator is a highly
integrated solution that significantly decreases the board space
and cost of modulators in digital cable-TV head-ends, digital
cable modem head-ends, digital microwave radio, SMATV and
MMDS applications. The
BCM3034
features an advanced
downstream QAM modulator that includes an extended ITU-T
J.83 Annex A/B/C FEC encoder, an all-digital QAM modulator
supporting up to 1024-QAM, and an integrated 10-bit D/A
converter with power control. Additionally, the
BCM3034
includes a second modulator that can be used for out-of-band
signaling or CPE power control.
The advanced downstream QAM modulator supports symbol
rates up to 10 MBaud and symbol constellations from QPSK up
to 1024-QAM, enabling up to 100 Mbps operation. The
modulator accepts either a serial or parallel data stream,
optionally recovers the data timing and encodes the data with one
of the supported coding standards. The resulting stream of QAM
symbols then enters the modulator where the data pulses are
shaped by the dual programmable linear phase square-root
Nyquist filters. Built-in coefficients are provided for these filters
for industry-standard excess bandwidth factors (alpha = 12%,
15% or 18%). The filtered data is then passed through a 24-tap
complex T/2-spaced predistortion filter. This filter allows the
user to compensate for non-idealities, such as slope distortion,
introduced elsewhere in the RF portion of a design. Interpolation
filters then upsample the signal to the output sample rate while
providing additional signal filtering. A quadrature direct digital
frequency synthesizer and I/Q modulator allows the QAM
spectrum to be mixed to a precise output center frequency. The
spectrum can then be predistorted by the integrated X/sinX filter
to compensate for DAC distortion. The final signal can be output
to the integrated 10-bit, 200-MS/s D/A converter, which
includes differential analog outputs and a gain stage that can set
the output power in 0.4 dB steps. Alternatively, a selectable 12-
or 14-bit digital IF output can drive an external D/A converter
with sufficient linearity to enable final RF sections that do not
require the use of SAW filters to meet industry-standard RF
output templates.
The
BCM3034
is a flexible, cost-effective worldwide solution.
Because the chip accepts variable data rates and supports
multiple digital transmission standards, manufacturers only need
to develop one modulator for worldwide usage. The integrated
feature set in the
BCM3034
significantly reduces the board
space in modulators, giving manufactures a chip solution that is
both cost-effective and easy to use.
B C
M 3 0 3 4 O V
E
R
V
I E
W
Interpolation
Filter
QDDFS
D/A
PLL / Clock Generation
Interpolation
Filter
Nyquist
= .12-.18
Output Clock PLL
Source Clock Generator
A_IF +/-
PS_VALID
PS_IN[7:0]
8
D_IF[13:0]
DAC_CLK
PS_SYNC
24-tap
Pre-
Filter
distortion
OB_DIN
PS_CLK
SCALE
X
sin X
Extended
ITU-T J.83
Annex A/B/C
Encoder
Programmable
Nyquist
= .12-.18
Programmable
Programmable
RS
FEC
Encoder
D/A
OB_IF +/-
4/16/32 QAM
Burst
Pwr. Mgmt.
Modulator
For more information please c ontac t us at:
Phone: 949-450-8700, FAX : 949-450-8710
Email: info@broadc om.c om
Visit our web site at: www.broadc om.c om
2001 by BROADCOM CORPORATION. All rights reserved.
3034-PB01-R-5.14.01
Broadcom
and the pulse logo are registered trademarks of Broadcom Corporation
and/or its subsidiaries in the United States and certain other countries.
BROADCOM CORPORAT ION
16215 Alton Parkway, P.O. Box 57013
Irvine, California 92619-7013
BCM3034 Bloc k Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BCM3040 | |
| BCM3118B | |
| BCM3120 | |
| BCM3137 | FUSE HOLD 5X20MM PCBMT |
| BCM3138 | Fuse Holder; Fuse Size/Group:5 x 20 mm; Body Material:Thermoplastic; Leaded Process Compatible:Yes; Mounting Type:PC Board Snap Mount RoHS Compliant: Yes |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BCM3037KPF | 制造商:Broadcom Corporation 功能描述: |
| BCM3040 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| BCM3040A0IQMG | 制造商:Broadcom Corporation 功能描述:DOWNSTREAM MODULATOR - Trays |
| BCM-306-060 | 制造商:SLPOWER 制造商全稱:SL Power Electronics 功能描述:BCM NiCd WIDE RANGE BATTERY CHARGERS |
| BCM-306-080 | 制造商:SLPOWER 制造商全稱:SL Power Electronics 功能描述:BCM NiCd WIDE RANGE BATTERY CHARGERS |
發(fā)布緊急采購，3分鐘左右您將得到回復。