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AK4133 датащи(PDF) 18 Page - Asahi Kasei Microsystems |
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AK4133 датащи(HTML) 18 Page - Asahi Kasei Microsystems |
18 / 29 page [AK4133] 015015325-E-02 2018/05 - 18 - ■ Soft Mute Function The AK4133 has soft mute function. Soft mute operation is controlled by the SMUTE pin. If the SMUTE pin is set to “H”, the SRC output data is attenuated to dB (“0”) in 1024 OLRCK cycles. When the SMUTE pin is returned to “L”, the mute is cancelled and the output attenuation level gradually changes to 0dB in 1024 OLRCK cycles. If the soft mute is cancelled before attenuating to dB after starting soft mute operation, attenuation is discontinued and the attenuation level is returned to 0dB by the same cycle. Soft mute is effective for changing the signal source without stopping the signal transmission. SMUTE Attenuation Level 0dB (1) (3) SDTO (2) dB Figure 15. Soft Mute (1) The output data is attenuated to (“0”) in 1024 OLRCK cycles by setting the SMUTE pin= “H”. (2) The attenuation level returns to 0dB in 1024 OLRCK cycles by setting the SMUTE pin= “L”. (3) If the soft mute is cancelled within 1024 OLRCK cycles, attenuation is discontinued and the attenuation level is returned to 0dB by the same cycle. ■ Regulator The AK4133 has an internal regulator which suppresses the voltage to 1.8V from DVDD (3.3V). The generated 1.8V power is used as power supply for internal circuit. When over-current is flowed to the regulator output, over-current detection circuit works. When over-voltage is flowed to the regulator output, over-voltage detection circuit works. The regulator block is powered-down and the AK4133 becomes reset state when over-current detection circuit or over-voltage detection circuit is operated. The AK4133 does not return to normal operation without a reset by the PDN pin when these detection circuits are worked. When over-current or over-voltage is detected, the PDN pin should be brought into “L” at once, and should be set to “H” again to recover normal operation. The SRCE_N pin indicates the internal status of the device. It outputs “L” in SRC normal operation, and outputs “H” when over-current or over-voltage is detected. ■ Power Supply The AK4133 supports 1.8V and 3.3V power supply voltages. Set the VSEL pin according to applying voltage. The VSEL pin should be set to “L” when using a 3.3V power supply. The internal regulator is turned ON and 1.8V power for internal circuits will be generated using 3.3V power from the DVDD pin. The VSEL pin should be set to “H” when using a 1.8V power supply. The internal regulator is turned OFF and the V18 pin becomes power supply pin for internal circuits. |
Аналогичный номер детали - AK4133 |
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Аналогичное описание - AK4133 |
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