ak4537 AKM Semiconductor, Inc., ak4537 Datasheet - Page 75

• Manufacturer Part Number: ak4537
• Description: 16-bit 6 Stereo Codec With Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
MS0202-E-04
Date (YY/MM/DD)
03/05/23
04/11/26
Revision
02
03
Reason
Explanation
addition:
Explanation
change:
Explanation
addition:
Page
55
65
28
65
24
32
66
- 75 -
Contents
Register Definitions (IPGAL6-0 and IPGAR6-0
bits)
MIC Input Recording Sequence
Example of ALC1 Operation
MIC Input Recording Sequence
Audio Interface Format
Headphone Output
Headphone Output Sequence (6), (9)
“When IPGA gain is changed, IPGAL6-0 and
IPGAR6-0 bits should be written while
PMMICL, PMMICR, PMIPGL or PMIPGR
bit is “1” and ALC1 bit is “0”. IPGA gain is
reset when PMMICL=PMMICR=PMIPGL
=PMIPGR= “0”, and then IPGA operation
starts from the default value when PMMICL,
PMMICR, PMIPGL or PMIPGR bit is
changed to “1”. When ALC1 bit is changed
from “1” to “0”, IPGA holds the last gain
value
IPGAL6-0 and IPGAR6-0 bits are read, the
register values written by the last write
operation are read out regardless the actual
gain.” is added.
Power Up MIC and ADC: “In case of stereo
mic, PMMICR and PMADR bits also should
be set to “1”.” is added.
Power Down MIC and ADC: “In case of
stereo mic, PMMICR and PMADR bits also
should be set to “0”.” is added.
“IPGA
=PMMICR=PMIPGL=PMIPGR= “0”, and
then IPGA operation starts from the default
value when PMMICL, PMMICR, PMIPGL or
PMIPGR bit is changed to “1”.” is added.
Table 15: IPGAL6-0,
IPGAR6-0=47H(+27.5dB)
Figure 22: Addr=0BH&0FH: Data=47H
ALC1 Control 3 (Addr: 0BH) Set up IPGA
value for ALC1: deleted.
“After the ALC1 bit is set to “1” and MIC
block is powered-up, the ALC1 operation
starts.”
MIC block is powered-up, the ALC1
operation starts from IPGA initial value
(0dB).”
[When LOOP bit = “1”, audio interface format
of SDTO is fixed to I
bits setting.] is added.
Rise/fall time constant: = 250ms(max).
Time until the common goes to HVSS when
PMHPL/R bits = “1” Æ “0”: 500ms(max).
Rise/fall time constant: = 250ms(max)
“After the ALC1 bit is set to “1” and
set
gain
by
is
ALC1
2
reset
S regardless of DIF1-0
operation.
when
10H(0dB)
PMMICL
[AK4537]
2005/04
When
10H