AD9975ABSTRL

更新时间： 2024-11-10 22:39:39

品牌	Logo	应用领域
亚德诺 - ADI		调制解调器
页数	文件大小	规格书
20页	1142K
描述
Broadband Modem Mixed-Signal Front End

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AD9975ABSTRL 数据手册

Broadband Modem

Mixed-Signal Front End

AD9975

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Low Cost, 3.3 V-CMOS, Mixed Signal, Front End

Converter for Broadband Modems

10-Bit D/A Converter (TxDAC+^®)

50 MSPS Input Word Rate

Interpolating Low-Pass Transmit Filter

100 MSPS DAC Output Update Rate

Wide (21 MHz) Transmit Bandwidth

Power-Down Modes

10-Bit, 50 MSPS A/D Converter

Fourth Order LPF with Selectable Cutoff Frequency

Dual Mode Programmable Gain Amplifier

Internal Clock Multiplier (PLL)

Two Auxiliary Clock Outputs

AD9975

TXEN

RXEN

TX+

TxDAC+

TX–

TXCLK

RXCLK

CLK1

CLK2

ADIO[9:0]

CLK-GEN

OSCIN

XTAL

48-Lead LQFP Package

RX+

RX–

ADC

LPF

PGA

APPLICATIONS

Powerline Networking

Home Phone Networking

AGC[2:0]

SPORT

CONTROL

GENERAL DESCRIPTION

The filter cutoff frequency can also be tuned or bypassed where

filter requirements differ. The 10-bit ADC uses a multistage

differential pipeline architecture to achieve excellent dynamic

performance with low power consumption.

The AD9975 is a single-supply, broadband modem, mixed

signal, front end (MxFE™) IC. The device contains a transmit

path interpolation filter and DAC and a receive path PGA,

LPF, and ADC required for a variety of broadband modem

applications. Also on-chip is a PLL clock multiplier that pro-

vides all required clocks from a single crystal or clock input.

The digital transmit and receive ports are multiplexed onto a

10-bit databus and have individual TX/RX clocks and TX/RX

enable lines. This interface connects directly to Homelug 1.0

PHY/MAC chips from Intellon and Conexant.

The TxDAC+ uses a digital 2× interpolation low-pass filter to

oversample the transmit data and ease the complexity of analog

reconstruction filtering. The transmit path bandwidth is 21 MHz

when sampled at 100 MSPS. The 10-bit DAC provides differen-

tial current outputs. The DAC full-scale current can be adjusted

from 2 to 20 mA by a single resistor, providing 20 dB of additional

gain range.

The AD9975 is available in a space-saving 48-lead LQFP pack-

age. The device is specified over the commercial (–40°C to

+85°C) temperature range.

The receive path consists of a PGA, LPF, and ADC. The program-

mable gain amplifier (PGA) has two modes of operation. One

mode allows programming through the serial port and provides a

gain range from –6 dB to +36 dB in 2 dB steps. The other mode

allows the gain to be controlled through an asynchronous 3-pin

port and offers a gain range from 0 dB to 48 dB in 8 dB steps

with the use of an external gain stage. The receive path LPF

cutoff frequency can be selected to either 12 MHz or 26 MHz.

TxDAC+ is a registered trademark and MxFE is a trademark of Analog Devices, Inc.

REV. 0

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

www.analog.com

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