AK4637EN Datasheet, PDF (64/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC/SPK-AMP

[AK4637]
[Monaural Line Output Control Sequence (SLPSN bit = “1”: in case of not using a Pop Noise Reduction
Circuit)]
(1)
(8)
LOSEL bit
(2)
SLPSN bit
(3)
(7)
PMSL bit
AOUT pin
External Input
External MUTE
(4)
(5)
MUTE
Normal Operation
(4)
(6)
MUTE
Figure 54. Monaural Line Output Control Sequence
(SLPSN bit = “1”: in case of not using a Pop Noise Reduction Circuit)
(1) Set LOSEL bit = “1”. Enable monaural line output.
(2) Set SLPSN bit = “1”. Pop noise reduction circuit is disabled.
(3) Set PMSL bit = “1”. Monaural line output is powered-up.
AOUT pin rises up to common voltage.
(4) Time constant is defined according to external capacitor (C) and resistor (R_L)_.
(5) Release external MUTE when the external input is stabled.
Monaural line output is enabled.
(6) Set external MUTE ON
(7) Set PMSL bit = “0”. Monaural line output is powered-down.
AOUT pin fall down.
(8) Set LOSEL bit = “0” after wait time (≥300ms). Disable monaural line output.
■ Regulator Block
The AK4637 integrates a regulator. The 3.3V (typ) power supply voltage from the AVDD pin is converted
to 2.3V (typ) by the regulator and supplied to the analog blocks (MIC-Amp, ADC, DAC, BEEP). The
regulator is powered up by PMVCM bit = “1”, and powered down by PMVCM = “0”. Connect a 2.2µF (±
10%) capacitor to the REGFIL pin to reduce noise on AVDD.
AK4637
Power-up: PMVCM bit = “1”
Power-down: PMVCM bit = “0”
AVDD
Regulator
typ 2.3V
To Analog Block
REGFIL
2.2F ± 10%
Figure 55 Regulator Block
015010680-E-00
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2015/09