GENERAL DESCRIPTION
The AD1803 is a low power, 16-bit codec for modem, voice/handset, and telephony applications. It can also be used as a cellular telephone interface.
The AD1803 is an Intel AC 97 Rev 2.1-compliant modem codec (refer to documentation about the Intel AC 97) with selectable AC 97 or a DSP-style serial interface.
The AD1803 codec uses high performance Σ-ΠADCs and DACs with programmable gain/attenuation. It has a digital Σ-Πmonitor output with selectable mix from ADC and DAC channels for call progress monitoring.
The AD1803 supports advanced power management with several power saving modes. The codec supports seven general purpose input/output (GPIO) pins and a wake interrupt signaling mechanism on GPIO events.
The AD1803JRUZ is a lead-free environmentally friendly product. It is manufactured using the most up-to-date mate rials and processes. The coating on the leads of each device is 100% pure tin electroplate. The device is suitable for lead-free applications and can withstand surface-mount soldering at up to 255°C (±5°C). In addition, it is backward compatible with conventional tin-lead soldering processes. This means that the electroplated tin coating can be soldered with tin-lead solder pastes at reflow temperatures of 220°C to 235°C.
FEATURES
 Low power modem/telephony codec
 16-bit oversampling Σ-Πconverter technology
 Intel® AC â97 Rev 2.1-compliant modem codec implementation
 AC â97 or DSP style serial interface
 Supports all modem/fax standards, including V.90
 Multiple crystal/clock rates supported
 Programmable gain, attenuation, and mute
 On-chip signal filters
    Digital interpolation and decimation filters
    Analog output low pass
 Programmable sample rates
    From 6.4 kHz to 16 kHz
    With 1 Hz, 8/7 Hz, and 10/7 Hz resolution
 Digital codec engine with variable sample rate conversion
 Digital monitor speaker output
 24-lead TSSOP
 0.6 μm CMOS technology
 Operation from 3.3 V or 5 V supply
 Advanced power management
APPLICATIONS
 Modems (PC and embedded)
 Voice and telephony
 Fax machines, answering machines, speakerphones
 PBX systems
 Smart appliances
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