AK4456 Datasheet, PDF (57/84 Pages) Asahi Kasei Microsystems – 115dB 768kHz Advanced 32-bit DAC

[AK4456]
■ Error Detection
Three types of error can be detected in I²C mode when the LDOE pin = “H” (Table 26). When the error is
detected, all circuits are powered-down and the analog outputs become floating (Hi-Z) state. In I2C mode, the
AK4456 does not generate acknowledge (ACK) in error status. Once the error is detected the AK4456 does not
return to normal operation automatically even if the error condition is removed so restart the AK4456 by the
PDN pin.
No Error
Error Condition
1 Internal Reference Voltage Error Internal reference voltage is not powered up.
2 LDO Over Voltage Detection
LDO voltage > 2.2 ~ 2.5V
3 LDO Over Current Detection
LDO current < 40 ~ 110mA
Table 26. Error Detection
■ System Reset
The AK4456 should be reset once by bringing the PDN pin = “L” upon power-up. In PCM (DSD) mode, the
AK4456 exits this system reset (power-down mode) by MCLK and LRCK (DCLK) after the PDN pin = “H”.
The AK4456 detects a rising edge of MCLK first, and then the analog block exits power-down mode by a
rising edge of LRCK (DCLK). The digital block exits power-down mode after the internal counter counts
MCLK for 4/fs.
015006886-E-00
- 57 -
2015/06