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CDB4222 Datasheet(PDF) 11 Page - Cirrus Logic |
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CDB4222 Datasheet(HTML) 11 Page - Cirrus Logic |
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11 / 26 page  Analog/Digital Volume Control - Control Port Mode Only The DAC outputs are each routed through an at- tenuator which is adjustable in 0.5 dB steps. Output attenuation is available through the Out- put Attenuator Data Bytes (#3 & #4). Level changes are implemented with an analog volume control until the residual output noise is equal to the noise floor in the mute state at which point volume changes are performed digitally. This technique is superior to purely digital volume control techniques as the noise is attenuated by the same amount as the signal, thus preserving dynamic range (see Figure 5). The CS4222 implements a "soft" volume control whereby level changes are achieved by ramping from the current level to the new level in 0.5 dB steps. The default rate of volume change is 8 LRCK cycles for each 0.5 dB step (equivalent to 647 µs at Fs = 48 kHz). The rate of volume Figure 4. Signal Noise 0 0 -113.5 Attenuation (dB) Analog Digital Figure 5. Hybrid Analog/Digital Attenuation CS4222 DS236PP3 11 |
Similar Part No. - CDB4222 |
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Similar Description - CDB4222 |
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