参数资料
型号: AS3517
厂商: ams
文件页数: 14/94页
文件大小: 0K
描述: IC CODEC AFE AUDIO STER 81-CTBGA
标准包装: 250
类型: 音频编解码器
应用: 便携式音频,电话
安装类型: 表面贴装
封装/外壳: 81-TFBGA
供应商设备封装: 81-CTBGA(9x9)
包装: 托盘
AS3517 V17
Data Sheet, Confidential
2003-2007, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
9.1.3
Audio Line Outputs (2x)
General
The line outputs are designed to provide the audio signal with typical 1VPEAK at a load of minimum 10k
Ω, which is a minimum value for
line inputs. If the limiters (N20/N21) are deactivated the peak output voltage is 1.45VPEAK. The load however can decrease to 64Ohm. In
addition these line output can be configured as mono differential to drive 1VPEAK @ 32
Ω load (e.g. an earpiece of a mobile phone).
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. A zero cross detection allows to control the actual execution of new gain settings.
If the line output is not enabled, the volume settings are set to their default values. Changing of volume and mute control can only be done
after enabling the output.
If using the output in mono differential mode, the volume setting for the right channel should be set to 0dB.
Figure 7 Line Output
Stereo Mode
Mono Differential Mode (please observe that gain of right
channel amplifier has to best to 0dB)
Parameter
Table 14 Line Output Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
Note
RL_LO
Load Impedance
(Stereo Mode)
64
line inputs nominally have
10k
CL_LO
Load Capacitance
(Stereo Mode)
100
pF
ALO
Programmable Gain
-40.5
+6
dB
Gain Steps
1.5
dB
discrete logarithmic gain
steps
Gain Step Accuracy
±0.25
dB
ALOMUTE
Mute Attenuation
100
dB
BVDD = 3.3V, TA= 25oC unless otherwise mentioned
Register Description
Table 15 Line Output Related Register
Name
Base
Offset
Description
LINE_OUT1_R
2-wire serial
00h
Right Line Output 1 volume settings, MUX control
LINE_OUT1_L
2-wire serial
01h
Left Line Output 1 volume settings
LINE_OUT2_R
2-wire serial
04h
Right Line Output 2 volume settings, MUX control
LINE_OUT2_L
2-wire serial
05h
Left Line Output 2 volume settings
AudioSet_1
2-wire serial
14h
Enable/disable driver stage
AudioSet_3
2-wire serial
16h
Enable/disable mixer input
Line output have to be enabled in register 14h first before other settings in register 00h and 01h can be programmed.
Revision 1v3
20
- 93
ams
AG
Technical
content
still
valid
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