DAC3550A Datasheet

Stereo Audio DAC


Features, Applications

Contents Page Section Title Introduction Main Features Functional Description I2S Interface Interpolation Filter Variable Sample and Hold 3rd-order Noise Shaper and Multibit DAC Analog Low-pass Input Select and Mixing Matrix Postfilter Op Amps, Deemphasis Op Amps, and Line-Out Analog Volume Headphone Amplifier Clock System Standard Mode MPEG Mode I2C Bus Interface Registers Chip Select Reduced Feature Mode Specifications Outline Dimensions Pin Connections and Short Descriptions Pin Descriptions Power Supply Pins Analog Audio Pins Oscillator and Clock Pins Other Pins Pin Configuration Pin Circuits Control Registers Electrical Characteristics Absolute Maximum Ratings Recommended Operating Conditions Characteristics Applications Line Output Details Recommended Low-Pass Filters for Analog Outputs Recommendations for Filters and Deemphasis Recommendations for MegaBass Filter without Deemphasis plus 1st-order low-pass Power-up/down Sequence Power-up Sequence Power-down Sequence Typical Applications Data Sheet History

Stereo Audio DAC 1. Introduction The DAC is a single-chip, high-precision, dual digital-to-analog converter designed for audio applications. The employed conversion technique is based on oversampling with noise-shaping. With Micronas' unique multibit sigma-delta technique, less sensitivity to clock jitter, high linearity, and a superior S/N ratio has been achieved. The DAC 3550A is controlled via I2C bus. Digital audio input data is received by a versatile I2S interface. The analog back-end consists of internal analog filters and op amps for cost-effective additional external sound processing. The DAC 3550A provides line-out, headphone/speaker amplifiers, and volume control. Moreover, mixing additional analog audio sources to the D/A-converted signal is supported. The DAC 3550A is designed for all kinds of applications in the audio and multimedia field, such as: MPEG players, CD players, DVD players, CD-ROM players, etc. The DAC 3550A ideally complements the MPEG 1/2 layer 2/3 audio decoder MAS 3507D. No crystal required for standard applications with sample rates from to 48 kHz. Crystal required only for automatic sample rate detection below 32 kHz, MPEG mode (refer to Section 2.10), and use of clock output CLKOUT. 1.1. Main Features � no master main input clock required � integrated stereo headphone amplifier and mono speaker amplifier � SNR of 103 dBA � I2C bus, I2S bus � internal clock oscillator � full-feature mode by I2C control (three selectable subaddresses) � reduced feature mode for non-I2C applications � continuous sample rates from 8 kHz to 50 kHz � analog deemphasis for 44.1 kHz � analog volume and balance: +18...-75 dB and mute � oversampling and multibit noise-shaping technique � THD better than % � two additional analog stereo inputs (AUX) with source selection and mixing � supply range: V � low-power mode � additional line-out � on-chip op amps for cost-effective external analog sound processing

Fig. 1�2: Typical application: MPEG Layer 3 Player



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