AK4536 Datasheet, PDF (47/59 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4536]
Addr
09H
Register Name
Input PGA Control
Default
D7
D6
D5
D4
D3
D2
D1
D0
0
IPGA6 IPGA5 IPGA4 IPGA3 IPGA2 IPGA1 IPGA0
0
0
0
1
0
0
0
0
IPGA6-0: Input Analog PGA (see Table 32)
Default: “10H” (0dB)
During the ALC1 operation, the writing value in IPGA6-0 bits is ignored.
In a manual mode, IPGA can be set to any values in Table 32.The ZTM1-0 bits set zero crossing timeout period
when IPGA value is changed. When the control register is written from the µP, the zero crossing counter is reset
and its counter starts. When the signal zero crossing or zero crossing timeout, the written value from the µP
becomes valid.
DATA (HEX) GAIN (dB)
STEP
47
+27.5
46
+27.0
45
+26.5
•
•
36
+19.0
•
•
10
+0.0
•
•
0.5dB
06
−5.0
05
−5.5
04
−6.0
03
−6.5
02
−7.0
01
−7.5
00
−8.0
Table 32. Input Gain Setting
Default
Addr
0AH
Register Name
Digital Volume Control
Default
D7
DVOL7
0
D6
DVOL6
0
D5
DVOL5
0
D4
DVOL4
1
D3
DVOL3
1
D2
DVOL2
0
D1
DVOL1
0
D0
DVOL0
0
DVOL7-0: Output Digital Volume (see Table 33)
The AK4536 has a digital output volume (256 levels, 0.5dB step, Mute). The gain can be set by the DVOL7-0
bits. The volume is included in front of a DAC block, a input data of DAC is changed from +12 to –115dB with
MUTE. This volume has a soft transition function. It takes 1061/fs (=133ms @ fs = 8kHz) from 00H to FFH.
DVOL7-0
Gain
00H
+12.0dB
01H
+11.5dB
02H
+11.0dB
•
•
18H
0dB
•
FDH
•
−114.5dB
FEH
−115.0dB
FFH
MUTE (−∞)
Table 33. Digital Volume Code Table
Default
MS0174-E-00
- 47 -
2002/09