U.s./international Modem Daa Line Codec Chipset - Analog Devices

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 AC97 Rev 2.1-compliant modem codec (refer to Intels AC97 specications at www.intel.com) with selectable AC97 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 lters 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. 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 codecs main ADC channel for processing independent of the AD1803. The AD1804s 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 Devices 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. By Analog Devices, Inc.
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AD1803




AD1804 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
AD1804 circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

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