| MC14433 STw5094 is a low power Stereo Audio DAC device with Headphones Amplifiers for high quality MP3 and FM radio listening. The STw5094 includes also an high performance low power combined PCM CODEC ¤ FILTER tailored to implement the audio front-end functions required by low voltage low power consumption digital cellular terminals with added MP3 and FM radio listening.
STw5094 offers a number of programmable functions accessed through an I2C-bus compatible interface.
The STw5094 Stereo Audio DAC section is suited for MP3, or any other audio stereo source, listening. It supports all the MP3 rates from 8kHz to 48kHz. The audio data serial interface is I2S compatible and can be programmed to handle 16 to 24 bit word length input data. The internal D to A converters work with 18 bit input resolution.
The Stereo Headphones drivers can also be used for FM Radio listening via an auxiliary stereo analog input.A Loudspeaker driver can also be used for monophonic group listening.
The STw5094 Voice Codec section can be configured either as a 14-bit linear or as an 8-bit companded PCM coder. The Frame Synchronism frequency of the Voice Codec can be either the standard 8kHz value or the extended 16kHz one.
In addition to the Stereo Audio DAC and CODEC ¤ FILTER functions, STw5094 includes Tone ¤ Ring ¤ DTMF generator that can be used both in Audio Listening mode and in Voice Codec mode, a sidetone generation, a buzzer driver output and a remote control function tailored to handle an external on-hook off-hook button.
STw5094 Voice Codec fulfills and exceeds D3 ¤ D4 and CCITT recommendations and ETSI requirements for digital handset terminals. The Stereo Audio DAC
part fulfills and exceeds the requirements for MP3 quality and FM radio quality listening. Main applications include digital mobile phones, as cellular and cordless phones, with added low-power high-quality MP3 and ¤ or FM radio listening features, or any battery powered equipment that requires Stereo Audio DAC with Headphones drivers operating at low single supply voltage. ...
MC14433 The UCC2891/2/3/4 family of PWM controllers is designed to simplify implementation of the various active clamp/reset switching power topologies.
The UCC289x is a peak current-mode, fixedfrequency, high-performance pulse width modulator.
It includes the logic and the drive capability for the auxiliary switch with a simple method of programming the critical delays for proper active clamp operation.
The UCC2891/3 includes a 110-V start-up regulator for initial start-up and to provide keep-alive power during stand-by.
Additional features include an internal programmable slope compensation circuit, precise DMAX limit, and a single resistor programmable synchronizable oscillator. An accurate line monitoring function also programs the converter’s ON and OFF transitions with regard to the bulk input voltage. Along with the UCC2897, this UCC289x family allows the power supply designer to eliminate many of the external components, reducing the size and complexity of the design. ...
MC14433 The LP3893 is a high-current, fast-response regulator which can maintain output voltage regulation with minimum input to output voltage drop. Fabricated on a CMOS process, the device operates from two input voltages: Vbias provides voltage to drive the gate of the N-MOS power transistor, while Vin is the input voltage which supplies power to the load. The use of an external bias rail allows the part to operate from ultra low Vin voltages. Unlike bipolar regulators, the CMOS architecture consumes extremely low quiescent current at any output load current. The use of an N-MOS power transistor results in wide bandwidth, yet minimum external capacitance is required to maintain loop stability.
The fast transient response of these devices makes them suitable for use in powering DSP, Microcontroller Core voltages and Switch Mode Power Supply post regulators. The parts are available in TO-220 and TO-263 packages. Dropout Voltage: 270 mV (typ) @ 3A load current. Ground Pin Current: 3 mA (typ) at full load. Shutdown Current: 60 nA (typ) when S/D pin is low. Precision Output Voltage: 1.5% room temperature accuracy. ...
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