ak4633 AKM Semiconductor, Inc., ak4633 Datasheet - Page 50

• Manufacturer Part Number: ak4633
• Description: 16-bit ?? Mono Codec With Alc & Mic/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
Soft mute operation is performed in the digital input domain. When the SMUTE bit goes to “1”, the input signal is
attenuated by −∞ (“0”) during the cycle of 245/fs (31msec@fs=8kHz). When the SMUTE bit is returned to “0”, the mute
is cancelled and the input attenuation gradually changes to 0dB during the cycle of 245/fs (31msec@fs=8kHz). If the soft
mute is cancelled within the cycle of 245/fs (31msec@fs=8kHz), the attenuation is discontinued and returned to 0dB. The
soft mute for Playback operation is effective for changing the signal source without stopping the signal transmission.
(1) The input signal is attenuated by −∞ (“0”) during the cycle of 245/fs (31msec@fs=8kHz).
(2) Analog output corresponding to digital input has the group delay (GD).
(3) If the soft mute is cancelled within the cycle of 245/fs (31msec@fs=8kHz), the attenuation is discounted and returned
When the PMBP bit is set to “1”, the beep input is powered-up. 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. Table 34 shows the typical
gain example at R
BEEPA bit = BEEPS bit = “0”.
MS0447-E-03
BEEP Input
SOFTMUTE
to 0dB within the same cycle.
SM U T E bit
Attenuation
Analog O utput
i
= 20kΩ. This gain is in inverse proportion to R
0dB
SPKG1-0 bits
-∞
00
01
10
11
BEEP
245/fs
Table 34. BEEP Input Gain at R
(1)
Figure 38. Block Diagram of BEEP pin
BEEP
Figure 37. Soft Mute Function
+10dB
+12dB
+14dB
+8dB
SPP/SPN Gain
Ri
G D
- 50 -
(2)
i
It should be set MDIF bit to “1” expect PMBP bit =
-
+
Rf
i
= 20kΩ
BEEP
245/fs
G D
0dB
0dB
0dB
0dB
AOUT Gain
(3)
[AK4633]
2006/04