参数资料
型号: AS3658-BCTP
厂商: ams
文件页数: 110/158页
文件大小: 0K
描述: IC PMU POWER/AUDIO 124-CTBGA
标准包装: 2,500
应用: 便携式设备
电流 - 电源: 7mA
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 124-TFBGA
供应商设备封装: 124-CTBGA(8x8)
包装: 带卷 (TR)
AS3658
Data Sheet Confidential
- Detailed Description- Audio Functions
Table 113. AudioSet_3 Register
Audio_set3 register
Addr:76
Configures the mixer inputs and AGC
Bit
Bit Name
Default
Access
Description
Switches the signal limiter OFF
4
agc_off
0
R/W
0
automatic gain control for summing stage
enabled
1
automatic gain control for summing stage
disabled
Input from DAC to R and L
5
dacmix_off
0
R/W
0
ON
1
OFF
Input from microphone to R and L
6
micmix_off
0
R/W
0
ON
1
OFF
Input from line input to R and L
7
linmix_off
0
R/W
0
ON
1
OFF
9.10
Line Output
9.10.1 General
The line output is designed to provide the audio signal on 600 Ω min.
This output stage has an independent gain regulation for left and right channel with 32 steps @ 1.5dB each. The gain
can be set from –40.5dB to +6dB.
9.10.2 No-Pop Function
To avoiding click and pop noise during power-up and shutdown, the output is automatically set to mute when the output
stage is disabled. Also the volume settings are set to their default values, and can’t be changed, as long the output
stage is not enabled.
LINE_CM pin, which needs a 0.1μF... 1μF capacitor outside gets charged on power-up with 1μA to ALVDD/2. After
start-up the DC level of the following pins are the same: LOUT_L=LOUT_R=LINE_CM= ALVDD/2. The Start-up time
before releasing mute is about 150ms with 0.1μF. To avoid pop-noise 150ms discharging time of LINE_CM after a
shutdown, have to be waited before starting up again.
9.10.3 Ground Noise Cancellation
The purpose of the ground cancellation circuit is to compensate noise (ground noise) between different grounds (e.g.
the ground where the AS3658 is soldered versus e.g. the ground of a car amplifier (see Figure 50) ). This noise
between these different grounds can be caused e.g. by a high current devices like a motor-fan. The ground
cancellation circuit can be used for line and headphone amplifiers.
The circuit works as follows:
The ground noise gets added inside the AS3658 to the audio signal (input LINE_CM for the Line Out amplifier or
HP_CM for headphone amplifier) in a way that it cancels inside the car amplifier. The sense point is connected with
R GND_SEP (20 Ω ) to the battery ground.
www.austriamicrosystems.com
Revision 1v13
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