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AK2401 Fiches technique(PDF) 15 Page - Asahi Kasei Microsystems |
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AK2401 Fiches technique(HTML) 15 Page - Asahi Kasei Microsystems |
15 / 103 page [AK2401] 017003093-E-00 2017/3 15 Figure 7. Interface Timing for ADC Data Read Parameter Symbol Min. Typ. Max. Unit AD_SCLK Frequency tCLK * 9 MHz AD_SCLK High Pulse Width 20pF load tHI 0.4 / tCLK µsec AD_SCLK Low Pulse Width 20pF load tLO 0.4 / tCLK µsec Note: * Digital output timings refer to a rising/falling signal of 0.5 VDD. * 9. AD_SCLK frequency will be different according to the channel filter setting <Address 0x22> DFIL_SEL[3:0] bits. Refer to “13.8.11 Output Sampling Rate” for details. 9.6. Serial Interface Timing for DAC Data Write Data write to the DAC is executed via serial interface that is configured with the DA_FS, DA_SCLK and DA_SDI pins. The D/A converter interface has shift register, and the data is written to the DA_SDI pin (MSB first) in a synchronization with a DA_SLCK rising edge. Parallel converted data is send to the D/A converter on a rising edge of the DA_FS pin and analog converted data is output to the SMFOUT pin. The maximum operational frequency of the D/A converter is 200kHz. The D/A data consists of 12 bits. Data input format is MSB first, 2’s complement. Input a 12-cycle clock during a period from a rising edge of the DA_FS pin to a next rising edge of the DA_FS pin according the timing chart below. First 12 bits data is valid when 12 bits or more clock and data are input. Figure 8. Interface Timing for DAC Data Write Parameter Symbol Min. Typ. Max. Unit DAC_FS Cycle Time tDACFS 5 µsec DA_FS High Pulse Width tFSHW 100 nsec DA_SCLK High Pulse Width tHI 100 nsec DA_SCLK Low Pulse Width tLO 100 nsec DA_SDI Setup Time tDH 50 nsec DA_SDI Hold Time tDS 50 nsec DA_SCLK Low Hold Time tSCLH 100 nsec DA_SCLK Setup Time tSCS 100 nsec 1 2 3 24 25 26 27 32 1 2 3 23 24 25 26 32 D23 D22 D1 D0 S13 D23 D22 D1 D0 S0 Ich Data Output Qch Data Output AD_SCLK (Output) AD_SDO (Output) AD_FS (Output) S12 S7 S6 S5 DA_SCLK (Input) DA_SDI (Input) DA_FS (Input) D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 tHI tLO tDS tDH tSCLH tSCS tFSHW tDACFS |
Numéro de pièce similaire - AK2401 |
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Description similaire - AK2401 |
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