参数资料
型号: AS3517
厂商: ams
文件页数: 16/94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
Over-current Protection
The headphone amplifier has an over-current protection (e.g. HPR/HPL is shorted). This over-current protection will power the headphone
amplifier down for a programmable timeout period (512ms, 256ms, 128ms). The current threshold is at 150mA for HPR/HPL and 300mA
for HPCM. There is a corresponding interrupt available to be enabled.
Headphone Detection
When the headphone amplifier is powered down, one can detect the connection of a headset. It only work if the headset is connected
between pins HPR/HPL and HPCM. As long as the headphone amplifier is powered down, HPCM is biased to 150mV and acting as the
sense pin. There is a corresponding interrupt available to be enabled.
Power Save Options
To save power, especially when driving 32 Ohm loads, a reduction of the bias current can be selected. Together with switching off the
phantom ground this gives 4 possible operating modes.
Table 16 Headphone Power-Save Options
HPCM_OFF
IBR_HPH
IDD_HPH (typ.)
Load
0
2.2mA
16 Ohm
1
0
1.5mA
16 Ohm
0
1
1.5mA
32 Ohm
1
1.0mA
32 Ohm
BVDD = 3.3V, TA= 25oC unless otherwise mentioned
Parameter
Table 17 Power Amplifier Block Characteristics
Symbol
Parameter
Min
Typ
Max
Unit
Note
RL_HP
Load Impedance
16
stereo mode
CL_LO
Load Capacitance
100
pF
stereo mode
PHP
Nominal Output Power
40mW
20mW
RL=16, limiter enabled
RL=32, limiter enabled
PHP_MAX
Max. Output Power
60mW
30mW
RL=16
RL=32
ALO
Programmable Gain
-45.5
+1
dB
Gain Steps
1.5
dB
discrete logarithmic gain
steps
Gain Step Accuracy
±0.25
dB
Over current limit
150
300
mA
HPR/HPL pins
HPCM pin
PSRRHP
Power Supply Rejection Ratio
90
dB
200Hz-20kHz, 720mVpp,
RL=16
ALOMUTE
Mute Attenuation
100
dB
BVDD = 3.3V, TA= 25oC unless otherwise mentioned
Register Description
Table 18 Headphone Related Register
Name
Base
Offset
Description
HPH_OUT_R
2-wire serial
02h
Right HP Output volume and over-current settings
HPH_OUT_L
2-wire serial
03h
Left HP Output volume settings, enable and detection control
AudioSet_3
2-wire serial
16h
Power save options, common mode buffer
IRQ_ENRD_3
2-wire serial
26h
Interrupt settings for over current and HP detection
Revision 1v3
22
- 93
ams
AG
Technical
content
still
valid
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