AK4137EQ Datasheet, PDF (49/65 Pages) Asahi Kasei Microsystems – 32bit SRC with PCM/DSD conversion

[AK4137]
■ Internal Status Pin
The SRCE_N pin indicates internal status of the device. This pin outputs “H” when the PDN pin = “L”.
SRC data is output from the SDTO pin, which corresponds to the each sampling frequency ratio
detected SRC, after a rising edge “↑” of PDN if the internal regulator is in normal operation.
When an over-current/voltage flows into the internal regulator, the SRCE_N pin outputs “H”. An
OR’ed result of the flags between over-current/voltage detection at the internal regulator and SRC
sampling frequency detection complete is output from this pin.
Over-Current/Voltage Limit Flag
（“L” Normal, “H” Over-Current（Voltage）detect）
SRC Sampling Frequency Ratio Detection Complete Flag
SRCE_N pin
Figure 43. Internal Flags and SRCE_N pin Output
In parallel control mode, if the AK4137 is set in SRC bypass mode by CM3-0 pins during the PDN pin =
“L” and powered-up, the SRCE_N pin outputs “L” after the power-up time of the internal regulator (max.
1.4ms) from a rising edge “↑” of the PDN pin.
In serial control mode, if BYPS bit is set to “1” while RSTN bit = “0”, the SRCE_N pin immediately
outputs “L” after register writing.
Rev. 0.2
- 49 -
2014/06