MAX192 Low-Power, 8-Channel, Serial 10-Bit ADC - Robotics UWA

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Low-Power, 8-Channel,Serial 10-Bit ADCMAX192CSSSTRBt CSHt CONVt SCKt CSSt SSTRBSCLKPD0 CLOCK INNOTE: FOR BEST NOISE PERFORMANCE, KEEP SCLK LOW DURING CONVERSION.Figure 10. Internal Clock Mode SSTRB Detailed TimingCSSCLK1 8 1 8 1DINS CONTROL BYTE 0 S CONTROL BYTE 1SCONTROL BYTE 2DOUTSSTRBB9 B8 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0CONVERSION RESULT 0B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0CONVERSION RESULT 1Figure 11a. External Clock Mode, 15 Clocks/Conversion TimingCSSCLKDINS CONTROL BYTE 0 S CONTROL BYTE 1DOUTB9 B8 B7 B6 B5 B4 B3 B2 B1 B0 S1 S0CONVERSION RESULT 0B9 B8 B7 B6CONVERSION RESULT 1Figure 11b. External Clock Mode, 16 Clocks/Conversion Timing14 ______________________________________________________________________________________
Low-Power, 8-Channel,Serial 10-Bit ADCCLOCKMODESHDNDININTERNALSETS EXTERNALCLOCK MODEEXTERNALSXXXXX11 SXXXX X 01SETS FASTPOWER-DOWN MODESETS EXTERNALCLOCK MODES XX XXX1 1EXTERNALMAX192DOUTDATA VALID(10 + 2 DATA BITS)DATA VALID(10 + 2 DATA BITS)VALID DATA INVALIDMODEPOWERED UPPOWERED UPFASTPOWER-DOWNFULLPOWERDOWNPOWEREDUPFigure 12a.Timing Diagram Power-Down Modes, External ClockCLOCKMODESETS INTERNALCLOCK MODEINTERNAL CLOCK MODESETS FULLPOWER-DOWNDINSXXXXX10 SXX X X X 00S DOUTDATA VALIDDATA VALIDSSTRBCONVERSIONCONVERSIONMODEPOWERED UPFULLPOWER-DOWNPOWEREDUPFigure 12b. Timing Diagram Power-Down Modes, Internal Clockonly available using an external clock and reduces themaximum clock rate to 400kHz.Power-DownChoosing Power-Down ModeYou can save power by placing the converter in alow-current shutdown state between conversions.Select full power-down or fast power-down mode viabits 7 and 8 of the DIN control byte with – S — H D — N – high(see Tables 3 and 6). Pull – S — H D — N – low at any time to shutdown the converter completely. S –— H D — N – overrides bits 7and 8 of DIN word (see Table 7).Full power-down mode turns off all chip functions that drawquiescent current, typically reducing I DD to 2µA.Fast power-down mode turns off all circuitry except thebandgap reference. With the fast power-down mode,the supply current is 30µA. Power-up time can be shortenedto 5µs in internal compensation mode.In both software shutdown modes, the serial interfaceremains operational, however, the ADC will not convert.Table 5 illustrates how the choice of reference-buffercompensation and power-down mode affects bothpower-up delay and maximum sample rate.______________________________________________________________________________________ 15
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MAX192 Low-Power, 8-Channel, Serial 10-Bit ADC - Robotics UWA

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