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參數(shù)資料
| 型號(hào)： | AK4640 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | Codec |
| 英文描述： | 16BIT CODEC WITH MIC /HP/SPK-AMPl |
| 中文描述： | 16位編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植，AMPl |
| 文件頁數(shù)： | 33/76頁 |
| 文件大小： | 634K |
| 代理商： | AK4640 |
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ASAHI KASEI
[AK4640]
MS0273-E-00
2004/03
- 33 -
Digital Attenuator
The AK4640 has a channel-independent digital attenuator (256 levels, 0.5dB step, Mute). The ATTL/R7-0 bits control
the attenuation level of each channel. When the DATTC bit = “1”, the ATTL7-0 bits control both Lch and Rch attenuation
levels. When the DATTC bit = “0”, the ATTL7-0 bits control Lch level and ATTR7-0 bits control Rch level. This
attenuator has a soft transition function. It takes 1061/fs(24ms@fs=44.1kHz) from 00H(0dB) to FFH(MUTE).
ATTL/R7-0
Attenuation
00H
01H
0.5dB
02H
1.0dB
03H
1.5dB
:
:
FDH
126.5dB
FEH
127.0dB
FFH
MUTE (
∞
)
Table 18. DATT Attenuation Table
Soft Mute
Soft mute operation is performed in the digital domain. When the SMUTE bit goes to a “1”, the output signal is attenuated
by
∞
(“0”) during the cycle set by the TM1-0 bits. When the SMUTE bit is returned to “0”, the mute is cancelled and the
output attenuation gradually changes to 0dB during the cycle set of the TM1-0 bits. If the soft mute is cancelled within the
cycle set by the TM1-0 bits after starting the operation, the attenuation is discontinued and returned to 0dB. The soft mute
is effective for changing the signal source without stopping the signal transmission (Figure 22).
The soft mute function is independent of output volume and cascade connected between both functions.
Default
0dB
:
:
SMUTE bit
Attenuation
TM1-0 bit
(1)
0dB
-
∞
TM1-0 bit
GD
(2)
GD
(3)
Analog Output
Figure 22. Soft Mute Function
(1) The output signal is attenuated until -
∞
(“0”) by the cycle set by the TM1-0 bits.
(2) Analog output corresponding to digital input has the group delay (GD).
(3) If the soft mute is cancelled within the cycle of setting the TM1-0 bits, the attenuation is discounted and returned to
0dB(the set value).
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| AK4640VN | 制造商:AKM 制造商全稱:AKM 功能描述:16BIT CODEC WITH MIC /HP/SPK-AMPl |
| AK4641 | 制造商:AKM 制造商全稱:AKM 功能描述:16 BIT CODEC WITH BLUETOOTH INTERFACE |
| AK4641EN | 制造商:AKM 制造商全稱:AKM 功能描述:16bit stereo CODEC with built-in Microphone-amplifier and 16bit Mono CODEC for Bluetooth Interface. |
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