AD9876-EB datasheet, PDF - EEWORLD Datasheet

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AD9876-EB: DescriptionBroadband Modem Mixed-Signal Front End; File Size363KB，24 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD9876-EB Overview

Broadband Modem Mixed-Signal Front End

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FEATURES

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

2 /4 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

Voltage Regulator Controller

48-Lead LQFP Package

APPLICATIONS

Powerline Networking

Home Phone Networking

xDSL

Broadband Wireless

Home RF

PRODUCT DESCRIPTION

PWR DN

Tx QUIET

GAIN

Tx [5:0]

Tx SYNC

Broadband Modem

Mixed-Signal Front End

AD9876

FUNCTIONAL BLOCK DIAGRAM

AD9876

MUX

Kx INTERPOLATION

LPF/BPF

TxDAC+

Tx+

Tx–

PLL-A

CLK-A

CLOCK GEN

CLK-B

Rx SYNC

PLL-B

M/N

REF

VRC

GATE

OSCIN

XTAL

Rx [5:0]

MUX

ADC

PGA

LPF

PGA

Rx+

Rx–

SPORT

CONTROL

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 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 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

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 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 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.

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, nor for any infringements of patents or other rights of third parties that

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

781/326-8703

Fax:

AD9876-EB Related Products

	AD9876-EB	AD9876
Description	Broadband Modem Mixed-Signal Front End	Broadband Modem Mixed-Signal Front End

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