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数据搜索系统，热门电子元器件搜索 |
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WM8232 数据表(PDF) 18 Page - Cirrus Logic |
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WM8232 数据表(HTML) 18 Page - Cirrus Logic |
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18 / 141 page  WM8232 18 Rev 4.6 CONTROL INTERFACE CIN IN* VRLC/ VBIAS VRLCEN 5-BIT RLCDAC VRLC_VSEL[4:0] RLC switch VSMP 'Video' sample capacitor 'Reference' sample capacitor VSMP CLAMP CLAMP VSMP (if CDS=0) RSMP (if CDS=1) RSMP (if CDS=1) VSMP (if CDS=0) Figure 10 RLC Clamp Control Options In CDS operation, when an input waveform has a stable reference level on every pixel, it may be desirable to clamp every pixel during this period. Setting CLAMP=high means that the RLC switch is closed whenever the RSMP is high, as shown in Figure 11. In non-CDS operation, setting CLAMP=high means that the RLC switch is closed whenever the VSMP is high, as shown in Figure 12. VSMP RSMP RLC switch control "CLAMP" RLC switch closed when RSMP=1 Video sample taken on fallling edge of VSMP Reset/reference sample taken on fallling edge of RSMP INPUT VIDEO SIGNAL reference ("black") level video level CLAMP Pixel counter Figure 11 Reset Level Clamp Operation, CDS Operation Shown VSMP RLC switch control "CLAMP" RLC switch closed when VSMP=1 Video sample taken on fallling edge of VSMP INPUT VIDEO SIGNAL CLAMP Pixel counter video level Figure 12 Line Clamp Operation, non-CDS operation shown |
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