ad1803jru Analog Devices, Inc., ad1803jru Datasheet

ad1803jru

Manufacturer Part Number

ad1803jru

Description

U.s./international Modem Daa Line Codec Chipset

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD1803JRU.pdf (2 pages)

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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

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

otherwise under any patent or patent rights of Analog Devices.

PRODUCT OVERVIEW

The AD1803/AD1804 chipset allows the implementation of a

low-cost full Modem DAA Line Interface and codec with mini-

mal external components. The AD1803 can also be used as a

stand-alone codec for voice/handset/telephony applications, or

as a cellular telephone interface.

The AD1803 is an Intel AC’97 Rev 2.1-compliant modem codec

(refer to Intel’s AC’97 speciﬁcations at www.intel.com) with

selectable AC’97 or a DSP-style serial interface.

The AD1803 codec uses high-performance sigma-delta ADC

and DACs with programmable gain/attenuation. It has a digital

monitor output with selectable mix from ADC and DAC chan-

nels for call progress monitoring. The AD1803 supports ring

validation and wake-up interrupt output signalling. The AD1803

has programmable ﬁlters dedicated to impedance synthesis and

when used with the AD1804, it provides a complete digital line

termination impedance synthesis control loop.

The AD1804 is a solid-state line-side analog phone interface

device that replaces a conventional discrete DAA. The AD1804

eliminates the need for transformer, relays, opto-isolators and a

2-to-4-wire hybrid. The AD1804 uses high-performance sigma-

delta ADC and DACs with programmable gain/attenuation. It

has digitally selectable line termination impedances.

FEATURES

Low Power Modem Codec AD1803 and Silicon DAA

AD1803 Can Be Used as a Stand-Alone Modem/Voice/

Intel AC’97 Rev 2.1-Compliant Modem Codec

AC’97 or DSP Style Serial Interface

Supports all Modem/Fax Standards Including V.90

Software Programmable DAA and Compliant with U.S.

FCC and CTR21 Approved

Capacitively Coupled Clock and Data Interface Across

Multiple Crystal/Clock Rates Supported

Programmable Gain, Attenuation and Mute

On-Chip Signal Filters

AD1804

Telephony Codec Independent of the AD1804

Implementation

and International PTT Standards

Isolation Barrier

Digital Interpolation and Decimation Filters

Analog Output Low Pass

The AD1804 features a Ring Detect comparator making the

chipset capable of ring and line reversal detection and validation.

The Ring/CID Buffer allows any line signal, whether ring, line

reversal, or even Caller ID data, to be sampled and driven directly

into the codec’s main ADC channel for processing independent of

the AD1803.

The AD1804’s dc line-hold current DAC, dc line voltage sense

ADC and the hold current regulator supports off-hook and pulse

dialing functions in addition to meeting the dc hold require-

ments of a given country. The AD1804 CTR21 circuit allows

the implementation of a high power dc shunt path without the

need for costly external high-power transistors to ensure compli-

ance to CTR21 DC hold current limit requirements.

The AD1804 hybrid provides 2-to-4-wire conversion, local echo

cancellation and correctly terminates the transmission line.

The AD1803/AD1804 chipset features Analog Device’s pro-

prietary isolation barrier techniques using low-cost high-voltage

capacitors to meet US and international isolation requirements.

The AD1803/AD1804 supports several advanced power manage-

ment features with several power-saving modes. The chipset also

supports wake-up on ring from D3-Cold system state.

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

Tel: 781/329-4700

Fax: 781/326-8703

Programmable Sample Rates

Digital Monitor Speaker Output

Integrated Ring Detector and Support for Soft Caller-ID

24-Lead TSSOP Package

APPLICATIONS

Modems (PC and Embedded)

Voice and Telephony

Fax Machines, Answering Machines, Speakerphones

PBX Systems

Smart Appliances

REFERENCE DESIGN

Available

0.6

Operation from 3.3 V or 5 V Supply

Advanced Power Management

Decode

From 6.4 kHz to 16 kHz

With 1 Hz, 8/7 Hz and 10/7 Hz Resolution

Supports Wake-Up on Ring from D3-Cold System State

m CMOS Technology

U.S./International Modem

DAA Line Codec Chipset

World Wide Web Site: http://www.analog.com

AD1803/AD1804

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ad1803jru Summary of contents

Page 1

... The AD1803/AD1804 supports several advanced power manage- ment features with several power-saving modes. The chipset also supports wake-up on ring from D3-Cold system state. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 ...

Page 2

... AD1803/AD1804 Model Temperature Range AD1803JRU AD1804JRU PIN 1 0.006 (0.15) 0.002 (0.05) SEATING ORDERING GUIDE Package Description 24-Lead Thin Shrink Small Outline Package 24-Lead Thin Shrink Small Outline Package OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 24-Lead TSSOP (RU-24) 0.311 (7.90) 0.303 (7.70 ...

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