Datasheet > AD9876

AD9876

更新时间： 2024-11-08 22:50:03

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
24页	487K
描述
Broadband Modem Mixed-Signal Front End

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AD9876 数据手册

Broadband Modem

Mixed-Signal Front End

AD9876

FEATURES

FUNCTIONAL BLOCK DIAGRAM

Low Cost 3.3 V CMOS Mixed-Signal Front End (MxFE™)

Converter for Broadband Modems

10-/12-Bit D/A Converter (TxDAC+^®)

64/32 MSPS Input Word Rate

2ꢀ/4ꢀ Interpolating LPF or BPF Transmit Filter

128 MSPS DAC Output Update Rate

Wide (26 MHz) Transmit Bandwidth

Power-Down Mode

10-/12-Bit 50 MSPS A/D Converter

Fourth Order Low-Pass Filter 12 MHz or 26 MHz

with Bypass

–6 dB to +36 dB Programmable Gain Amplifier

Internal Clock Multiplier (PLL)

Clock Outputs

PWR DN

AD9876

Tx QUIET

GAIN

Tx [5:0]

Tx SYNC

Tx+

Tx–

MUX

Kx INTERPOLATION

LPF/BPF

TxDAC+

PLL-A

ꢀ L

REF

GATE

CLK-A

CLK-B

CLOCK GEN

VRC

OSCIN

PLL-B

ꢀ M/N

XTAL

Rx SYNC

Voltage Regulator Controller

48-Lead LQFP Package

Rx+

Rx–

MUX

PGA

Rx [5:0]

SPORT

LPF

ADC

APPLICATIONS

Powerline Networking

Home Phone Networking

xDSL

CONTROL

Broadband Wireless

Home RF

PRODUCT DESCRIPTION

path LPF cutoff frequency can be programmed to either 12 MHz

or 26 MHz. The filter cutoff frequency can also be tuned or

bypassed where filter requirements differ. The 12-bit ADC uses

a multistage differential pipeline architecture to achieve excellent

dynamic performance with low power consumption.

The AD9876 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 supporting a variety of broadband modem applications.

Also on-chip is a PLL clock multiplier that provides all required

clocks from a single crystal or clock input. The AD9876 provides

12-bit converter performance on both the Tx and Rx path.

The AD9876 provides a voltage regulator controller (VRC) that

can be used with an external power MOSFET transistor to form

a cost-effective 1.3 V linear regulator.

The TxDAC+ uses a selectable digital 2× or 4× interpolation

low-pass or band-pass filter to further oversample transmit data

and reduce the complexity of analog reconstruction filtering.

The transmit path signal bandwidth can be as high as 26 MHz

at an input data rate of 64 MSPS. The 12-bit DAC provides

differential current outputs for optimum noise and distortion

performance. 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 digital transmit and receive ports are each multiplexed to a

bus width of six bits and are clocked at a frequency of twice the

12-bit word rate.

The AD9876 ADC and/or DAC can also be used at sampling

rates as high as 64 MSPS in a 6-bit resolution nonmulti-

plexed mode.

The AD9876 is pin compatible with the 10-bit AD9875. Both are

available in a space-saving 48-lead LQFP package. They are speci-

fied over the industrial (–40°C to +85°C) temperature range.

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

a gain range of –6 dB to +36 dB, programmable in 2 dB steps,

adding 42 dB of dynamic range to the receive path. The receive

MxFE is a trademark of Analog Devices, Inc.

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

REV. A

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

www.analog.com

Fax: 781/326-8703

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与AD9876相关器件

型号	品牌	获取价格	描述	数据表
AD9876BST	ADI	获取价格	Broadband Modem Mixed-Signal Front End
AD9876BSTRL	ADI	获取价格	Broadband Modem Mixed-Signal Front End
AD9876-EB	ADI	获取价格	Broadband Modem Mixed-Signal Front End
AD9877	ADI	获取价格	Mixed-Signal Front End Set-Top Box, Cable Modem
AD9877ABS	ADI	获取价格	Mixed-Signal Front End Set-Top Box, Cable Modem
AD9877ABSZ	ADI	获取价格	Single Supply Cable Modem/Set Top Box Mixed Signal Front End (MxFE®)
AD9877-EB	ADI	获取价格	Mixed-Signal Front End Set-Top Box, Cable Modem
AD9878	ADI	获取价格	Mixed-Signal Front End for Broadband Applications
AD9878BST	ADI	获取价格	Mixed-Signal Front End for Broadband Applications
AD9878BSTZ	ADI	获取价格	Mixed-Signal Front End for Broadband Applications

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