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| AT73C213 |
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 ATMEL
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Features • Stereo Audio DAC – 2.7V to 3.3V Analog Supply Operation – 2.4V to 3.3V Digital Supply Operation – 20-bit Stereo Audio DAC – 93 dB SNR Playback Stereo Channels – 32 Ohm/20 mW Stereo Headset Drivers with Master Volume and Mute Controls – Stereo Line Level Input with Volume Control/mute and Playback through the Headset Drivers – Differential Monaural Auxiliary Input, with Volume Control/mute and Playback through the Headset Drivers – Accepts Mixed Signals from All Signal Paths (Line Inputs, External Mono and DAC Output) – 8, 11.024, 16, 22.05, 24, 32, 44.1 and 48 kHz Sampling Rates – 256x or 384xFs Master Clock Frequency – I2S Serial Audio Interface • Mono Audio Power Amplifier – Supply Input from Main Li-Ion Battery – 440mW on 8 Ohm Load – Low Power Mode for Earphone – Programmable Volume Control (-22 to +20 dB) – Fully Differential Structure, Input and Output – 8 mA Drain Current in Full Power Mode – Power-down mode (Consumption Less than 2uA) – Minimum External Components (Direct Connection of the Loudspeaker) • Applications: Mobile Phones, Digital Cameras, PDAs, SmartPhones, DECT Phones, Music Players 1. Description The AT73C213 is a fully integrated, low-cost, combined stereo audio DAC and audio power amplifier circuit targeted for Li-Ion or Ni-Mh battery powered devices such as mobile phones, smartphones, PDA, DECT phones, digital still cameras, music players or any other type of handheld device where an audio interface is needed. The stereo DAC section is a complete high performance, stereo audio digital-to-ana- log converter delivering a 93 dB dynamic range. It comprises a multibit sigma-delta modulator with dither, continuous time analog filters and analog output drive circuitry. This architecture provides a high insensitivity to clock jitter. The digital interpolation fil- ter increases the sample rate by a factor of 8 using 3 linear phase half-band filters cascaded, followed by a first order SINC interpolator with a factor of 8. This filter elim- inates the images of baseband audio, retaining only the image at 64x the input sample rate, which is eliminated by the analog post filter. Optionally, a dither signal can be added that reduces possible noise tones at the output. However, the use of a multibit sigma-delta modulator already provides extremely low noise tone energy. Master clock is from 256 or 384 times the input data rate, allowing choice of input data rate up to 50 kHz, including standard audio rates of 48, 44.1, 32, 16 and 8 kHz. The DAC section is followed by a volume and mute control and can be simultaneously played back directly through a stereo 32 Ohm headset pair of drivers. Power Management for Mobiles (PM) AT73C213 Audio Interface for Portable Handsets 2744A–PMGMT–27-Jan-05 |
