AK4632 Datasheet, PDF (34/70 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Mono CODEC with ALC & MIC/SPK/Video-AMP

ASAHI KASEI
[AK4632]
„ Digital Output Volume
The AK4632 has a digital output volume (256 levels, 0.5dB step, Mute). The volume 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 or 256/fs from 00H to FFH.
DVOL7-0
Gain
00H
+12.0dB
01H
+11.5dB
02H
+11.0dB
•
•
18H
0dB
Default
•
•
FDH
−114.5dB
FEH
−115.0dB
FFH
MUTE (−∞)
Table 16. Digital Output Volume Code Table
DVTM bit
0
1
The transition time from 00H to FFH of DVOL7-0 bits
Transition Time
fs=8kHz
fs=22.05kHz
1061/fs
133msec
48msec
256/fs
32msec
12msec
Table 17.Setting of transition time
„ BEEP Input
When the PMBP bit is set to “1”, the beep input is powered-up. And when the BEEPS bit is set to “1”, the input signal
from the BEEP pin is output to Speaker-Amp. When the BEEPA bit is set to “1”, the input signal from the BEEP pin is
output to the mono line output amplifier. The external resister Ri adjusts the signal level of BEEP input. The gains are
shown in Table 18, when Ri = 20kΩ. These gain are in inverse proportion to Ri.
BEEP
Rf
Ri
-
+
SPKG1-0 bits
00
01
10
11
Figure 32. Block Diagram of BEEP pin
BEEP Æ SPP/SPN Gain
BEEP Æ AOUT Gain
+7.89dB
0dB
+9.93dB
0dB
+14.11dB
0dB
+16.15dB
0dB
Table 18. Beep input gain at R_i = 20kΩ
MS0396-E-00
- 34 -
2005/06