ST公司的TS4657是集成高性能音頻線路驅動器的立體聲DAC,能從3.0V-5.5V單電源中產生2.2Vrms的輸出.取樣頻率32-48kHz,16-24位音頻數據格式,SNR為95dB,主要應用在數字機頂盒,DVD播放器,DTV,筆記本電腦,手提音頻設備和聲卡.本文介紹了TS4657主要特性,方框圖,典型應用電路和測試電路.
The TS4657 is a stereo DAC that integrates a high-performance audio line driver capable of generating a 2.2 Vrms output level from a single 3.0 to 5.5 V supply. One single supply is sufficient for the digital and analog parts of the circuit, thus eliminating the need for external regulators.
The TS4657 is a low-power consumption device. It features only 22 mW power dissipation at a 3.0 V power supply in full operation. A 16-bit multi-bit sigma delta DAC is used,operating at 256xFs with oversampling digital interpolation filters. The digital audio data can be 16-to 24-bit long and sample rates from 32 to 48 kHz are supported.
The output stage signal is ground-referenced by using an internal self-generated negative power supply, and as such external bulky output coupling capacitors are not necessary.
The TS4657 is packaged in a small 4 x 4 mm QFN20 package, ideal for portable applications.
TS4657主要特性:
■ Single 3.0 to 5.5 V supply for DAC and line driver
■ Audio line output: 2.2 Vrms for all VCC range
■ 16- to 24-bit audio data format stereo DAC, 32 to 48 kHz sample rate
■ I²S, right- or left-justified compatible digital audio interface
■ 95 dB SNR A-weighted at 48 kHz, VCC =5 V
■ 7.4 mA current consumption at VCC = 3.0 V, full operation
■ Internal negative power supply to ensure ground-referenced, capless outputs
■ No external capacitor needed for the negative power supply generation
■ Integrated structure to suppress pop and click noise
■ Available in thin QFN20 4 mm x 4 mm package
TS4657應用:
■ Digital set-top boxes
■ DVD players
■ Digital TVs
■ Notebooks
■ Portable audio equipment
■ Sound cards
圖1.TS4657方框圖
圖2.TS4657典型應用電路
圖3.TS4657典型測試電路圖
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