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AK7755EN Datasheet(PDF) 87 Page - Asahi Kasei Microsystems |
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AK7755EN Datasheet(HTML) 87 Page - Asahi Kasei Microsystems |
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87 / 109 page  [AK7755] 014006643-E-00 2014/10 - 87 - ■ ADC Block 1. ADC High Pass Filter A digital High Pass Filter (HPF) is integrated for DC offset cancellation of the ADC input. The cut-off frequency of the HPF is approximately 1Hz (at fs=48kHz). fs 48kHz 44.1kHz 8kHz Cut-off frequency 3.73Hz 3.43Hz 0.62Hz 2. ADC Soft Mute 2-1. Description The ADC block has a digital soft mute circuit. The soft mute operation is performed in the digital domain. The output signal is attenuated to -∞ in “ADC Digital Volume Level x ATT transition time” from the current ADC Digital Volume Setting Level by setting ADMUTE and AD2MUTE bits to “1”. When the ADMUTE (CONT1A: D7) and AD2MUTE (CONT1A: D6) bits are returned to “0”, the mute is cancelled and the output attenuation gradually changes to ADC Digital Volume Setting Level in “ADC Digital Volume Level x ATT transition time”. If the soft mute is cancelled before attenuating to -∞ after starting the operation, the attenuation is discontinued and returned to ADC Digital Volume Setting Level by the same cycle. The soft mute is effective for changing the signal source without stopping the signal transmission. The transition time from 0dB to -∞ and vice versa is 828 LRCK cycles. The soft mute function works when the ADC is in operation. The attenuation value is initialized by the PDN pin = “L”. SMUTE Register Value -∞dB 0dB Attenuation Output Image Group Delay (GD) 828/fs 828/fs Group Delay (GD) Figure 71. ADC Soft Mute 2-2. Input Selector Switching Sequence The input selector should be changed after soft muting to avoid the switching noise of the input selector. · Input Selector Switching Sequence 1. Enable soft mute before changing the channel. 2. Change the Channel. 3. Disable softer mute. ADMUTE Attenuation Channel DATT Level -∞ (1) (2) IN1/IN3 IN2/IN4 (1) (3) Figure 72. ADC Input Channel Switching Sequence Example |
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Similar Description - AK7755EN_16 |
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