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參數(shù)資料
| 型號： | WM9712LEFL |
| 廠商： | Wolfson Microelectronics |
| 元件分類： | Codec |
| 英文描述： | AC97 Audio and Touchpanel CODEC |
| 中文描述： | AC97音頻編解碼器和觸摸屏 |
| 文件頁數(shù)： | 73/78頁 |
| 文件大小： | 689K |
| 代理商： | WM9712LEFL |
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Production Data
WM9712L
w
PD Rev 4.0 December 2003
73
AC-COUPLED HEADPHONE OUTPUT
The circuit diagram below shows how to connect a stereo headphone to the WM9712L.
C2 220uF
HPOUTL
HPOUTR
HPGND = 0V
C1 220uF
WM9712L
Figure 25 Simple Headphone Output Circuit Diagram
The DC blocking capacitors C1 and C2 together with the load resistance determine the lower cut-off
frequency, fc. Increasing the capacitance lowers fc, improving the bass response. Smaller
capacitance values will diminish the bass response. For example, with a 16
load and C1 = 220
μ
F:
fc = 1 / 2
π
R
L
C
1
= 1 / (2
π
x 16
x 220
μ
F) = 45 Hz
DC COUPLED (CAPLESS) HEADPHONE OUTPUT
In the interest of saving board space and cost, it may be desirable to eliminate the 220
μ
F DC
blocking capacitors. This can be achieved by using OUT3 as a headphone pseudo-ground, as shown
below.
WM9712L
HPOUTL
HPOUTR
OUT3 = AVDD/2
Figure 26 Capless Headphone Output Circuit Diagram (OUT3SRC = 10)
As the OUT3 pin produces a DC voltage of AVDD/2, there is no DC offset between
HPOUTL/HPOUTR and OUT3, and therefore no DC blocking capacitors are required. However, this
configuration has some drawbacks:
The power consumption of the WM9712L is increased, due to the additional power
consumed in the OUT3 output buffer.
If the DC coupled output is connected to the line-in of a grounded piece of equipment,
then OUT3 becomes short-circuited. Although the built-in short circuit protection will
prevent any damage to the WM9712L, the audio signal will not be transmitted properly.
OUT3 cannot be used for another purpose
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| WM9712LEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFL | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFT | AC97 Audio and Touchpanel CODEC |
| WM9712LSEFV | AC97 Audio and Touchpanel CODEC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM9712LEFL/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFL/V | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFT | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFT/RV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
| WM9712LEFV | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:AC97 Audio and Touchpanel CODEC |
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