AK4536 Datasheet, PDF (32/59 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4536]
n Digital Output Volume
The AK4536 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 (=133ms @ fs = 8kHz) from 00H to FFH.
DVOL7-0
Gain
00H
+12.0dB
01H
+11.5dB
02H
•
18H
•
FDH
+11.0dB
•
0dB
•
−114.5dB
Default
FEH
−115.0dB
FFH
MUTE (−∞)
Table 16. Digital Output Volume Code Table
n 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 internal feedback
resistance is 20k ± 30%Ω.
BEEP
Rf = 20kΩ
Ri
-
+
Figure 7. Block Diagram of BEEP pin
MS0174-E-00
- 32 -
2002/09