Datasheet > AD9879-EB

AD9879-EB

更新时间： 2024-09-17 04:04:23

品牌	Logo	应用领域
亚德诺 - ADI		调制解调器电缆调制解调器
页数	文件大小	规格书
32页	1080K
描述
Mixed-Signal Front End Set-Top Box, Cable Modem

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AD9879-EB 数据手册

Mixed-Signal Front End

Set-Top Box, Cable Modem

AD9879

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Low cost 3.3 V MxFE™ for

DOCSIS-, EURO-DOCSIS-, DVB-, DAVIC-compliant

set-top box and cable modem applications

232 MHz quadrature digital upconverter

12-bit direct IF DAC (TxDAC+™)

Up to 65 MHz carrier frequency DDS

Programmable sampling clock rates

16× upsampling interpolation LPF

Single-tone frequency synthesis

Analog Tx output level adjust

Direct cable amp interface

12-bit, 33 MSPS direct IF ADC

with optional video clamping input

10-bit, 33 MSPS direct IF ADC

Dual 7-bit, 16.5 MSPS sampling I/Q ADC

12-bit Σ-∆ auxiliary DAC

–1

TX DATA

SINC

⇑16

DAC

DDS

Σ-∆

Σ-∆_OUT

CA_PORT

MCLK

SPORT

CONTROL REGISTERS

PLL

XM/N

RXI

RXIQ[3:0]

ADC

MUX

RXQ

ADC

RX10

RXIF[11:0]

APPLICATIONS

Cable modem and satellite systems

ADC

RX12

MUX

CLAMP

VIDEO

Set-top boxes

AD9879

Power line modem

PC multimedia

Figure 1.

Digital communications

Data and video modems

QAM, OFDM, FSK modulation

GENERAL DESCRIPTION

The AD9879 is a single-supply set-top box and cable modem

mixed-signal front end. The device contains a transmit path

interpolation filter, complete quadrature digital upconverter,

and transmit DAC. The receive path contains a 12-bit ADC, a

10-bit ADC, and dual 7-bit ADCs. All internally required clocks

and an output system clock are generated by the phase-locked

loop (PLL) from a single crystal or clock input.

The 12-bit and 10-bit IF ADCs can convert direct IF inputs up

to 70 MHz and run at sample rates up to 33 MSPS. A video

input with an adjustable signal clamping level, along with the

10-bit ADC, allow the AD9879 to process an NTSC and a QAM

channel simultaneously.

The programmable Σ-Δ DAC can be used to control external

components, such as variable gain amplifiers (VGAs) or voltage

controlled tuners. The CA port provides an interface to the

AD8321/AD8323 or AD8322/AD8327 programmable gain

amplifier (PGA) cable drivers, enabling host processor control

via the MxFE SPORT.

The transmit path interpolation filter provides an upsampling

factor of 16× with an output signal bandwidth as high as

8.3 MHz. Carrier frequencies up to 65 MHz with 26 bits of

frequency tuning resolution can be generated by the direct

digital synthesizer (DDS). The transmit DAC resolution is

12 bits and can run at sampling rates as high as 232 MSPS.

Analog output scaling from 0.0 dB to 7.5 dB in 0.5 dB steps is

available to preserve SNR when reduced output levels are

required.

The AD9879 is available in a 100-lead MQFP. It offers enhanced

receive path undersampling performance and lower cost when

compared with the pin-compatible AD9873. The AD9879 is

specified over the commercial (−40°C to +85°C) temperature

range.

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, nor for any

infringements of patents or other rights of third parties that may result from its use.

Specifications subject to change without notice. No license is granted by implication

or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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