AT73C240-EK1【PDF 1/38 页】KIT EVALUATION FOR AT73C240

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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

90 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

– Accepts Mixed Signals from All Signal Paths (Line Inputs 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 (3V to 5.5V)

– 440 mW on 8 Ohm Load

– Programmable Volume Control (-22 to +20 dB)

– Fully Differential Structure, Input and Output

– 8 mA Drain Current in Active Mode

– Power-down Mode (Consumption Less than 2 μA)

– Minimum External Components (Direct Connection to the Loudspeaker)

? Applications: Mobile Phones, Digital Cameras, PDAs, SmartPhones, DECT Phones,

Music Players

1. Description

The AT73C240 is a fully integrated, low-cost, combined stereo audio DAC and audio

Power

Management

and Analog

Companions

(PMAAC)

AT73C240

Audio Interface

for Portable

Handsets

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 90 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 256 or 384 times the input data rate, allowing choice of input data rate

up to 48 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.

The stereo 32 Ohm headset pair of drivers also includes a mixer of a LINEL and

LINER pair of stereo inputs.

6464A–PMAAC–28-Apr-09

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