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參數(shù)資料
| 型號： | C-MAJORAUDIOCODECDOCUMENTATION |
| 元件分類： | Codec |
| 英文描述： | C-MAJOR AUDIO CODEC DOCUMENTATION Appnote: Audio Codec Capacitor Decoupling Performance Comparison (pdf. 19Kb. 2-ST002-AN-1099) |
| 中文描述： | C大音頻編解碼器文檔應(yīng)用筆記：音頻編解碼器性能對比去耦電容（pdf. 19Kb。2 - ST002 -安- 1099） |
| 文件頁數(shù)： | 1/1頁 |
| 文件大?。?/td> | 18K |
| 代理商： | C-MAJORAUDIOCODECDOCUMENTATION |
Capacitor Comparison Product Brief
Page - 1 of 1
10/06/99
Product Brief
Audio Codec Capacitor Decoupling
Performance Comparison
Introduction
SigmaTel has consistently provided the industry’s highest performance AC’97 audio codecs for applications in PCs,
settop boxes, DVD players, PDAs, and other audio enabled equipment. Recent improvements in the designs from
SigmaTel now offer the option of significantly reducing the size and number of external decoupling capacitors used to
filter internal voltages. Audio subsystem costs are now even lower with this option for fewer and smaller external
components. The charts below indicate the expected performance levels expected for a typical PCI sound card design.
These results can also be applied to the increasingly popular motherboard designs with AC’97 audio on-board. It
should be noted that motherboards can have additional noise sources not present on sound cards. In the case of a high
noise environment, the decoupling capacitor values can be slightly increased typical sound card values to improve
performance.
CAP2 Reduction Effect
The CAP2 input on SigmaTel codecs is used to decouple the ADC reference voltage. The standard value for CAP2 is
listed as +10uF in most SigmaTel documentation. As is apparent from the chart, values down to 0.01uF have no
appreciable effect on ADC performance.
CAP2 and VREFcap Combined Reduction Effect
The CAP2 input on SigmaTel codecs is used to decouple the ADC reference voltage, while the VREFcap decouples the
primary internal reference voltage. The standard value for CAP2 and VREFcap is listed as +10uF in most SigmaTel
documentation. As is apparent from the chart, both capacitors can be reduced to values as small as 0.01uF with only a
minor effect on ADC performance.
SigmaTel Inc
Integrating Mixed-Signal Solutions
Audio Performance vs CAP2 Value
74
76
78
80
82
84
86
88
90
10pF
100pF
1000pF
0.01uF
CAP2 Value
0.1uF
1.0uF
10uF
A
ADC THD+N 0dB
ADC -60dB DR
ADC SNR
VREF decoupled with 1.0uF and 0.1uF
Audio Performance vs CAP2/VREFcap Value
72
74
76
78
80
82
84
86
88
90
10pF
100pF
1000pF
0.01uF
0.1uF
1.0uF
10uF
CAP2/VREFcap Value
A
ADC THD+N 0dB
ADC SNR
ADC -60dB DR
VREF and CAP2 decoupled with same values
2-ST002-AN-1099
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