DM6580E datasheet(40/48 Pages) DAVICOM

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DM562P

V.90 Integrated Data/ Fax/Voice/Speakerphone

Modem Device Single Chip with Memory Built in

Final

Chip 2 : DM6580 Analog Front End

DM6580 Description

The DM6580 is a single chip Analog Front End (AFE)

designed to be implemented in voice grade modems

for data rates up to 56000bps. The DM6580 is an

essential part the complete modem device set. The

AFE converts the analog signal into digital form and

transfers the digital data to the DSP through the serial

port. All the clock information needed in a modem

device is also generated in the DM6580. Differential

analog outputs are provided to achieve the maximum

output signal level. An audio monitor with

programmable volume levels is built in to monitor the

on-line signal. Inside the device, a 16-bit ADC and a

16-bit DAC with over-sampling and noise-shaping

techniques is implemented to maximize performance.

The DM6580 offers wide-band transmit and receive

filters so that the voice band signal is transmitted or

received without amplitude distortion and with

minimum group delay. In order to support multi-mode

modem standards, such as V.90, V.34+, V.32bis,

V.32, V.22bis, V.22, V.23, V.21, Bell 212A, Bell 103,

V.17, V.29, V.27ter,

programmable baud and data

rate clock generators are provided. For asymmetric

channel usage, the transmit and receive clock

generators are independent. In order to enhance

echo-cancellation, the receive clock is synchronized

with the transmit clock and the best receive timing

sample is reconstructed by a reconstruction filter. The

Transmit Digital Phase Lock Loop (DPLL) is

self-tuning to provide a master, slave or free-running

mode for the data terminal interface. A receive DPLL

that is step programmable by the host DSP is

implemented to get the best samples for the relevant

signal processing.

DM6580 Block Diagram

RxSCLK

RxDCLK

RFS

DOR

DIR

TFS

DOT

DIT

Digital

Reconstruction

Filter

SCLK

Digital

Interface

Rx Clock

System

Tx Clock

System

Divider

Control

Registers

Tx Filter &

DAC

Rx Filter &

ADC

LPF &

Attenuator

Voltage Reference

0/-6 dB

Audio Amplifier

Power-on

Detector

SPKR

RxIN

VREFN

VREFP

TxA2

TxA1

CLKIN

TxSCLK*2

TxDCLK

ExtCLK

VCM

Version: DM562P-DS-F01

February 02, 2004

DM6580E 数据表(PDF) 40 Page - Davicom Semiconductor, Inc.

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