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AK7755 Datasheet(PDF) 100 Page - Asahi Kasei Microsystems |
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AK7755 Datasheet(HTML) 100 Page - Asahi Kasei Microsystems |
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100 / 109 page  [AK7755] 014006643-E-00 2014/10 - 100 - 2. Interface The input data channel of the DMDAT1/2 pin is set by DCLKP1/2 bit (CONT1E: D6/D3). When DCLKP1/2 bit = “1”, L channel data is input to the decimation filter if the DMCLK1/2 pin= “H”, and R channel data is input if the DMCLK1/2 = “L”. When DCLKP1/2 bit = “0”, R channel data is input to the decimation filter while DMCLK1/2 pin= “H”, and L channel data is input while DMCLK1/2 pin= “L”. The DMCLK1/2 pin only supports 64fs. It outputs “L” when DCLKE1/2 bit = “0”, and outputs 64fs clock when DCLKE1/2 bit = “1”. The output data through “the Decimation and Digital Filters” is 24bit full scale when the 1bit data density is 0%~100%. DCLKP1 bit DMCLK1 pin = “H” DMCLK1 pin = “L” 0 Rch Lch (default) 1 Lch Rch DCLKP2 bit DMCLK2 pin = “H” DMCLK2 pin = “L” 0 Rch Lch (default) 1 Lch Rch Table 13. Data Input/Output Timing with Digital MIC DMCLK1/2(64fs) DMDAT1/2(Lch) Valid Data Valid Data Valid Data Valid Data DMDAT1/2(Rch) Valid Data Valid Data Valid Data Valid Data Figure 77. Data Input/Output Timing with Digital MIC (DCLKP1/2 bit = “1”) DMCLK1/2(64fs) DMDAT1/2(Lch) Valid Data Valid Data Valid Data Valid Data DMDAT1/2(Rch) Valid Data Valid Data Valid Data Valid Data Figure 78. Data Input/Output Timing with Digital MIC (DCLKP1/2 bit = “0”) ■ Digital Mixer ADC output (SDATAD), ADC2 output (SDATAD2) and DSP-DOUT4 data can be mixed into a signle serial data by a mixer circuit. SELMIX[2:0] bits (CONT09: D0, CONT08: D1, D0) control mixing setting. Delay time of the mixer circuit is 4Ts (4/fs). SELMIX mode SELMIX [2:0] MIXOUT Lch MIXOUT Rch 0 000 SDOUTAD Lch SDOUTAD Rch (default) 1 001 SDOUTAD Lch/2 + SDOUTAD2 Lch/2 SDOUTAD Rch 2 010 SDOUTAD Lch SDOUTAD Lch/2 + SDOUTAD2 Lch/2 3 011 SDOUTAD2 Lch SDOUTAD2 Rch 4 100 DSP-DOUT4 Lch SDOUTAD2 Rch 5 101 SDOUTAD2 Lch DSP-DOUT4 Rch 6 110 DSP-DOUT4 Lch SDOUTAD Rch 7 111 SDOUTAD Lch DSP-DOUT4 Rch Table 14. Digital Mixer Output Setting |
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