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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8985GEFL/R датащи(PDF) 67 Page - Wolfson Microelectronics plc |
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WM8985GEFL/R датащи(HTML) 67 Page - Wolfson Microelectronics plc |
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67 / 118 page  Pre-Production WM8985 w PP, Rev 3.4, October 2006 67 CLASS D / CLASS AB HEADPHONE OUTPUTS (LOUT2 AND ROUT2) The outputs LOUT2 and ROUT2 are designed to drive two headphone loads of 16 Ω or 32Ω or line outputs (See Headphone Output and Line Output sections, respectively). Each output has an individual volume control PGA, a mute and an enable control bit as shown in Figure 27. LOUT2 and ROUT2 output the left and right channel mixer outputs respectively. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R7 (07h) 7:4 DCLKDIV 1000 Controls clock division from SYSCLK to generate suitable class D clock. Recommended class D clock frequency = 1.4MHz. 0000 = divide by 1 0010 = divide by 2 0011 = divide by 3 0100 = divide by 4 0101 = divide by 5.5 0110 = divide by 6 1000 = divide by 8 1001 = divide by 12 1010 = divide by 16 R23 (17h) 8 CLASSDEN 0 Enable signal for class D mode on LOUT2 and ROUT2 0 = Class AB mode 1 = Class D mode Table 35 Class D Control Registers When driving headphones using class D outputs it is necessary to use appropriate filtering, placed close to the device, to minimise EMI emissions from the headphone cable (Refer to "Applications Information" for more information). This filtering does not prevent class AB mode operation. Figure 27 LOUT2 and ROUT2 Class D Headphone Configuration |
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