參數(shù)資料
型號(hào)： AS3517-T
廠商： ams
文件頁(yè)數(shù)： 15/94頁(yè)
文件大小： 0K
描述： IC CODEC AFE AUDIO STER 81-CTBGA
標(biāo)準(zhǔn)包裝： 2,000
類型： 音頻編解碼器
應(yīng)用： 便攜式音頻，電話
安裝類型： 表面貼裝
封裝/外殼： 81-TFBGA
供應(yīng)商設(shè)備封裝： 81-CTBGA（9x9）
包裝： 帶卷 (TR)
AS3517 V17
Data Sheet, Confidential
2003-2007, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
9.1.4
Headphone Output
General
The headphone output is designed to provide the audio signal with 2x40mW @ 16
Ω or 2x20mW @32Ω, which are typical values for
headphones. If the limiters (N20/N21) are disabled a maximum output of 2x60mW@16 or 2x30mW@32 can be achieved.
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 –
43.43dB to +1.07dB. A zero cross detection allows to control the actual execution of new gain settings.
Figure 8 Headphone Output
Headphones connected via decoupling capacitors
Headphones connected to Phantom Ground
(Common Mode)
Phantom Ground
There are 2 ways to connect a headphone to the AFE. In order to spare the bulky ac/dc decoupling capacitors at pins HPR/HPL a
buffered ground (Phantom Ground) is provided. This Common Mode Buffer needs to be switched on if utilized. If form factor
considerations are less stringent, the headphones can be conventionally connected via 2x100F capacitors.
No-Pop Function
The output is automatically set to mute when the output stage is disabled.
To avoid Pop-Click noise during power-up and shut-down of the headphone amplifier, a charge/discharge control of HPGND (0V-1.45V-
0V) at pins HPR/HPL is incorporated into the AFE. The 100nF capacitor at pin HPGND is used to form the charge/discharge slope. Pls
observe that pin HPGND is a high impedance node which must not be connected to any other external device than the 100nF buffer
capacitor. To avoid Pop-Click noise one has to wait for 150ms in between a power-down (switch-off) and a power-up (switch-on) of the
headphone amplifier.
The output is automatically set to mute when the output stage is disabled.
Figure 9 HP POP-Click Suppression
t
HPGND [V]
70ms
AGND
MUTE OFF
HP Amps
powered down
Operation
Revision 1v3
21
- 93
ams
AG
Technical
content
still
valid
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