AK4133VN Datasheet, PDF (18/28 Pages) Asahi Kasei Microsystems – 192kHz 24bit Sample Rate Converter

[AK4133]
■ 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
0dB
(1)
Attenuation Level
dB
(2)
(3)
SDTO
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.
015015325-E-01
- 18 -
2016/06