参数资料
型号: AS3658-BCTP
厂商: ams
文件页数: 113/158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
Left Line Register
Table 117. LINE_OUT_L Register
Addr:84
LINE_OUT_L
These bits control the Line in volume and mode
Bit
Bit Name
Default
Access
Description
volume settings for left Line output, adjustable in 32
steps @ 1.5dB
00000
-40.5 dB gain
4:0
liner_vol
00000b
R/W
00001
-39 dB gain
......
11110
11111
4.5 dB gain
6 dB gain
5
-
0
reserved
6
line_on
0
R/W
0
1
Line stage not powered
power up Line stage
0
normal operation
7
line_mute
0
R/W
1
Line output set to mute (mute is on during
power-up)
9.11
Headphone Output
The headphone output is designed to provide the audio signal with 2x40mW @ 16 Ω or 2x20mW @32 Ω , which are
typical values for headphones.
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.
9.11.1 Phantom Ground
HP_CM_PWR pin is the buffered HP_CM output. It can be used to drive the common mode level with a load of 2k Ω .
The phantom ground can be switched off to save power if not needed.
9.11.2 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.
HP_CM pin, which needs a 100nF to 1μF capacitor outside, gets charged on power-up with 1μA to AVDD/2. After start-
up the DC level of the following pins are the same: HPR=HPL=HP_CM=HP_CM_PWR=AVDD/2. The Start-up time
before releasing mute is about 150ms. To avoid pop-noise 150ms discharging time of HP_CM after a shutdown, have
to be waited before starting up again.
9.11.3 Over-current Protection
This output stage has an over-current protection, which disables the output for 256ms or 512ms. This value can be set
in the headphone registers. The over-current protection limit of HPR and HPL pin is about 260mA while HP_CM_PWR
pin has a 370mA limit.
www.austriamicrosystems.com
Revision 1v13
112 - 157
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