[ ak 9240 ] rev. 0.7 201 5 / 7 - 1 - g eneral d escription the AK9240 is a n analog front end with 12 - bit 1msps a/d converter. it integrates a programmable gain amplifier (pga) that is able to select the input current and the input voltage realizing to contro l the input range. an led driver and a uto power control circuits are also integrated , making the device suitable for compact optical encoders. the AK9240 is housed in a space - saving 20 - pin qfn package. f eatures ? simultaneous sampling 12 - bit s ar a/d converter ? sampling rate: 1ms ps ? differential inputs ? current input or voltage input selectable ? pga function ? led driver ? automatic power control circuit ? low pass filter ? s/(n+d): 71 db (typ.) at 10khz input. ? inl: 1.25lsb (max.) ? dnl: 1.0lsb (max.) ? power consumption: 17 ma ( t y p . ) a t voltage input mode, fs= 1msps ? po wer supply: 2.7 ~ 5.5v ? operational temperature range ( ta ) : - 40 ~ 105 o c ? small package: 20 - pin qfn (3mm x 3mm) figure 1 . AK9240 block diagram afe with dual 12 - bit 1msps sar adc ak 9240 = preliminary = v ss a in 0 n vdd ledo vref p led ref vref n a in 0 p current input pga 0 pga 1 auto power controller led driver voltage input current input voltage input sar adc 1 sar adc 0 serial i/f & control logic sdat i csn sdo1 sclk sdo0 ain1 n a in 1 p current input voltage input current input voltage input lvdd rst n drvdd sdato led lpf 2.5v reference
[ ak 9240 ] rev. 0.7 201 5 / 7 - 2 - package outline di mensions 3 . 0 0 3 . 0 0 0 . 0 7 0 . 0 7 b a 0 . 2 5 m 0 . 0 5 0 . 0 5 5 1 0 1 1 1 5 c a b 2 0 1 0 . 5 0 ( 0 . 3 0 ) 1 . 9 0 1 . 9 0 c 0 . 3 0 0 . 2 5 0 . 0 7 0 . 0 5 0 . 2 5 0 . 0 0 ~ 0 . 0 5 ( 0 . 2 0 ) [ a ? ] 0 . 0 5 c 0 . 0 5 m a x c 0 . 7 0 0 . 7 5 m a x a
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