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[ ak9223] 0 14010283 - e - 0 1 1 2015/01 g eneral d escription the ak9223 is a 2ch delta - s igma modulator that achieves 86db dynamic range. it operates of a 5v power supply. the ak9223 is available in a space - saving 24 - pin tssop package. f eatures ? resolution : 1 6 - bit ? ? ? ? ? ? 2ch ? modulator ? ? ? ? ? ? ? ? figure 1 . block diagram ak9223 dual 1 - bit, 10mhz, 2nd - order, ? modulat or second - order ? modulator 2.5v reference voltage avdd dvdd 20mhz osc oscillator output interface circuit clock select ain0+ ain0 - ref i0 c h2+ ref2 refo out1 out2 clki sel vss1 vss2 c h2 - ain1+ ain1 - ref i1 second - order ? modulator clk o vss 3 vss 4 vss 5
[ ak9223] 0 14010283 - e - 0 1 2 2015/01 pin configurations 6 5 4 3 2 1 avdd vss 1 test0 refi0 ain0+ ain0 - ain1 - 7 ain1+ 8 a vdd refo vss 4 out 0 o ut 1 clko vss 5 dvdd top view 10 9 test1 refi1 vss 2 11 avdd 12 clki sel vss 3 avdd 19 20 21 22 23 24 18 17 15 16 14 13
[ ak9223] 0 14010283 - e - 0 1 3 2015/01 pin functions pin no. pin name i/o function 1 avdd 0.1f ceramic capacitor. vss1 refi0 test0 ain0+ ain0 ain1+ ain1 test1 refi1 vss 2 a vdd 0.1f ceramic capacitor. avdd 0.1f vss 3 sel h: , l clki dvdd 0.1f ceramic capacitor. vss 5 clko out1 out0 vss 4 ref0 a vdd 0.1f ceramic capacitor. handling of unused pin unused i/o pins must be connected appropriately. classification pin name setting analog a in 0 + , ain0 - , an1+, ain1 - , refi0, refi1 vss
[ ak9223] 0 14010283 - e - 0 1 4 2015/01 a bsolute m aximum r ating s ( vss1 ~vss5 = 0v ; note 2 , note 3 ) parameter symbol m in . m ax . unit power suppl y vdd - 0.3 +6.0 v analog input current (ain0+, ain0 - , ain1+, ain1 - , refi0, refi1) aiin - ? ? ? r ecommended o perating c ondition s (vss1~vss 5 = 0v ; note 2 , note 3 ) parameter symbol m in . t yp . m ax . unit analog power supply a vdd 4.5 5.0 5.5 v digital power supply dvdd 3v logic level 5v logic level 2.7 4.5 3.0 5 3.6 5.5 v v input reference voltage refi 0.5 2.5 2.6 v analog input vin= (ain+) - (ain - ) - 0.92 x vref +0.92 x vref v external clock 16 20 24 mhz ambient operating temperature ta - 40 105 ? note 3 . vss1, vss2, vss3, vss4 and vss5 must be connected to the same analog ground plane. note 4 . the p ower supply sequence between avdd and dvdd is not critical upon power - up. * akm assumes no responsibility for the usage beyond the conditions in this datasheet.
[ ak9223] 0 14010283 - e - 0 1 5 2015/01 analog characteristics (ta = - 40 ? c to 10 5 ? c; a vdd= 5 v , dvdd=3v, ain+=0.2v to 4.8v, ain - =2.5v, refi=refo=2.5v (internal), clki= 20 mhz, and 16bit sinc 3 filter with osr =256 ; unless otherwise specified ) parameter m in . t yp . m ax . unit resolution 16 - - bits integral nonlinearity (inl) error ( note 5 ) vin = ? ? ? analog input full scale differential i nput v oltage r ange: (ain+) - (ain - ) ain - =2.5v - ref i - +ref i v specified differential i nput v oltage r ange (ain+) - (ain - ) ain - =2.5v - 0.92 x ref i - +0.92 x ref i v absolute input voltage r ange 0 - avdd v input capacitance ain to vss - 1 - pf input leakage c urrent clock turned off ( note 9 ) - 1 - +1 ? ? sampling dynamics internal clock f requency sel=1, - 40 ? ? dynamic characteristics thd vin = 2.3vpp at 5khz - - 8 5 - 80 db sfdr vin = 2.3vpp at 5khz 82 86 - db s/n vin = 2.3vpp at 5khz 8 8 9 2 - db vin = 2.0vpp at 5khz 8 7 91 - db s/(n+d) vin = 2.3vpp at 5khz 80 84 - db channel to channel isolation vin = 2.3vpp at 5khz - 100 - db note 5 . integral nonlinearity is defined as the maximum deviation of the line through the end poin ts of the specified input range. note 6 . this is the maximum variation referring the offset of ta = 25 ? c when the temperature range is from - 40 to 105 ? c . note 7 . referring the refi pin (it does not include internal vref variation ) note 8 . this value does not include temperature drift of the internal vref . note 9 . outgoing current from the ak 9223 is defined as - polarity. note 10 . recommended input range of the e xternal clock is from 16mhz to 24mhz . the range of 1mhz ~ 16mhz and 24mhz ~ 32mhz can also be available with reduced accuracy .
[ ak9223] 0 14010283 - e - 0 1 6 2015/01 analog characteristics (ta = - 40 ? c to 10 5 ? c; a vdd= 5v, dvdd=3v , ain+=0.2v to 4.8v, ain - =2.5v, refi x =refo=2.5v (internal), clki= 20 mhz, and 16bit sinc 3 filter with osr =256 ; unless otherwise specified ) parameter m in . t yp . m ax . unit reference voltage output reference output voltage 2.475 2.5 2.525 v reference output voltage drift 20 ppm/ ? ? ? ? reference voltage input reference input voltage 0.5 2.5 2.6 v input resistance 100 m ? ? power supplies aidd sel=1 sel=0 didd dvdd=3v, clko = 10mhz dvdd=5v, clko = 10mhz 12.2 11.8 0.9 1.3 17 16 2 3 ma ma ma ma note 11 . t o accuracy level of 0.1 %. this value will be 40 ? s ( typ ) when no load . refo ak9223 c f
[ ak9223] 0 14010283 - e - 0 1 7 2015/01 dc characteristics ( t a = - 40 ? c to 10 5 ? c , avdd= 4. 5v to 5.5v , dvdd= 2.7 v to 5.5 v ) parameter symbol m in . t yp . m ax . unit high - level input voltage 1, dvdd= 2.7v to 3.6 v vih1 2 - v low - level input voltage 1, dvdd= 2.7v to 3.6 v vil1 - 0.8 v high - level input voltage2, dvdd= 4.5 v to 5.5 v vih 2 0. 7 x dvdd - - v low - level input voltage2, dvdd= 4.5 v to 5.5 v vil 2 - - 0. 3 x dvdd v input capacitance ic - 5 - pf input leakage current iin - -
[ ak9223] 0 14010283 - e - 0 1 8 2015/01 switching characteristics ( ta = - 40 ? c to 10 5 ? c , avdd=5v, dvdd= 2.7v to 5.5 v , cl=30pf ) parameter symbol m in . t yp . m ax . unit clk i period tcki 41.6 1000 ns clki high pulse width t ckh 10 tcki - 10 ns clko period sel=0 sel=1 t cko 1 tcko2 2 x tcki 91 1 11 n s ns clko high pulse width t ckoh (tcko/2) - 5 (tcko/2) + 5 ns clki ? timing diagram figure 2 . data output timing o ut tckh clk i clk o tcki tcko tckoh tpd1 tpd2 tpd3 ,tpd4 50%dvdd 50%dvdd 50%dvdd
[ ak9223] 0 14010283 - e - 0 1 9 2015/01 functional descriptions the ak9223 is a 2ch delta - sigma modulator. 0 and 1 data is output from its out pin s and the level of analog input signal is expressed by th e density of th is digital output . a delta - sigma modulator shifts quantized noise to high band. a low - pass filter is needed at the output of the ak9223. high band noise is filtered and the 1 - bit data steam at a high sampling rate is converted in to a high er - bit data word at a low er rate by this low - pass filter (decimation). this digital filter can be composed by a fpga and etc . figure 3 shows ext ernal circuit example. recommended parts shown below should be connected as close as possible to the device. figure 3 . ak9223 recommended external circuits ad conversion characteristics (speed and accuracy) are dependent on osr (over sampling ratio) and digital filter type. when the conversion rate is low, greater output accuracy can be achieved by increasing the osr. when the osr is low , output accuracy is low but high speed conversion is available. w ith an appropriate digital filter, the ak9223 is c a pable of ad conversion results that have a dynamic range exceeding 86db with an osr = 256. a in0 + a in0 - refi0 vss 1 vss 2 vss 3 vss 4 5v 5v 5v 5v 0.1uf 0.1uf 0.1uf 0.1uf a vdd a vdd a vdd a vdd 3v d vdd vss 5 clko out 0 out 1 fpga or asic clki 3v ca = 680p f a in1 + refi 1 refo a in1 - 0.1uf test0 test1 0.1uf 47 47 2.5v 2.5v ???` ca =680pf 47 47 2.5v 2.5v ???` sel
[ ak9223] 0 14010283 - e - 0 1 10 2015/01 internal operation the analog input of the ak9223 is composed by sc ( switched - capacitor ) circuits and this modulator block digitize s analog inputs to 1 - bit data stream. the clock source can be external or internal oscillator output. analog input is sampled by the modulator and compared with the reference voltage of the refi pin. a digital stream that represents the analog input voltage over time appears at the output of the corresponding converter. modulator the ak9223 can be operated in two modes . internal oscillation is used for the operation clock of the modulator by setting the sel pin = h . in this case, the internal clock is fixed to 20mhz. when the sel pin is set to l , modulator clock is externally input to the clki pin. in both of mode s, the clock is internally divided by two and functions as the modulator clock . when using an external clock, available input clock range is from 1mhz to 24mhz. in this case, the modulator operates of a clock from 500khz to 12mhz. digital i/f analog input signals are converted with the modulator input clock. the out pin outputs the result of ad conversion. the common clock that is used for two modulator s is output from the clko pin. when the sel pin = h , the clki pin must not be allowed to float but should be connected to dvdd or vss5.
[ ak9223] 0 14010283 - e - 0 1 11 2015/01 digital filter digital data stream is output form the modulator. this data stream should be processed by a digital filter to obtain an equivalent digital data to the analog input. transfer function of the simple sinc 3 filter is shown below. h ( z ) = ( 1 ? ? ? ??? 1 ? ? ? 1 ) 3 this filter provides the best out put performance with a relatively low number of gates required for implementation. all the characterizations i n this datasheet are done using a sinc 3 filter (osr = 256, output word width: 16 bit s) . figure 4 and figure 5 show the filter characteristics. the location of the first notch is fdata (=fmod / osr). the - 3db point is located at half the nyquist frequency or fdata /4 . figure 4 . sinc 3 frequency characteristics (osr=32) figure 5 . sinc 3 frequency characteristics ( osr=256 )
[ ak9223] 0 14010283 - e - 0 1 12 2015/01 system design power supply digital power supply determines the i/o interface voltage . it ranges from 2.7v to 5.5v. inputs to the ak9223, such as ain+, ain - and clki pins should not be present bef ore the power supply is on. decoupling a decoupling capacitor should be connected to the pin as close as possible. a 0. 1 f ceramic capacitor should be connected between avdd (pin #1) and vss1, avdd (pin #12) and vss2, avdd (pin #13) and vss3, avdd (pin #24) and vss4, and dvdd and vss5. if the analog and digital i/o power s are drawn from the same source, connect a 10 resistor between the analog and digital power supply pins , and connect the power source to the analog power supply pin . an rc filter should be composed by this 10 resister and a 0.1 f capacitor to reduce noise s i n the analog supply .
[ ak9223] 0 14010283 - e - 0 1 13 2015/01 package outline dimensions 24 - pin tssop (unit: mm) 0 - 8 ? detail a 0.10 0.15 0.05 0. 2 5 ? 0. 05 0.65 7. 8 ? 0. 1 a 1 12 13 24 6.4 ? 0. 15 0. 6 ? 0. 1 4.4 ? 0. 1 0. 9 ? 0. 05 1.10 max 0 .10 0.05
[ ak9223] 0 14010283 - e - 0 1 14 2015/01 marking a. pin # 1 indication b. product name: AK9223MK c. date code: aaywwb aa : administration code 2 digits y : year 1 digit ww : week 2 digits b : administration code 1 digit ak 9223mk aa ywwb
[ ak9223] 0 14010283 - e - 0 1 15 2015/01 ordering guide ordering guide AK9223MK ? 40 ? +105 ? c 24 - pin tssop (0.65mm pitch) revision history date (y/m/d) revision reason page contents 1 5 / 01 / 15 0 1 first edition
[ ak9223] 0 14010283 - e - 0 1 16 2015/01 important notice 0. asahi kasei microdevices corporation (akm) reserves the right to make changes to the information contained in this document without notice. when you consider any use or application of akm product stipulated in this document ( product ) , please make inquiries the sales office of akm or authorized d istributor s as to current status of the products. 1. all information included in this document are provided only to illustrate the operation and application examples of akm products . akm neither makes warranties or representations with respect to the accur acy or completeness of the information contained in this document nor grants any license to any intellectual property rights or any other rights of akm or any third party with respect to the information in this document. you are fully responsible for use o f such information contained in this document in your product design or applications . akm assumes no liability for any losses incurred by you or third parties arising from the use of such information in your product design or applications. 2. the product is neither intended nor warranted for use in equipment or systems that require extraordinarily high levels of quality and/or reliability and/or a malfunction or failure of which may cause loss of human life, bodily injury, serious property damage or seriou s public impact , including but not limited to, equipment used in nuclear facilities, equipment used in the aerospace industry, medical equipment, equipment used for automobiles, trains, ships and other transportation, traffic signaling equipment, equipment used to control combustions or explosions, safety devices, elevators and escalators, devices related to electric power, and equipment used in finance - related fields. do not use product for the above use unless specifically agreed by akm in writing . 3. tho ugh akm works continually to improve the products quality and reliability, you are responsible for complying with safety standards and for providing adequate designs and safeguards for your hardware, software and systems which minimize risk and avoid situations in which a malfunction or failure of the product could cause loss of human life, bodily injury or damage to property, including data loss or corruption. 4. do not use or otherwise make available the product or related technology or any information contained in this document for any military purposes, including without limitation, for the design, development, use, stockpiling or manufacturing of nuclear, chemical, or biological weapons or missile technology pr oducts (mass destruction weapons). when exporting the p roducts or related technology or any information contained in this document, you should comply with the applicable export control laws and regulations and follow the procedures required by such laws an d regulations. the p roducts and related technology may not be used for or incorporated into any products or systems whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. 5. please contact akm sales repr esentative for details as to environmental matters such as the rohs compatibility of the product. please use the product in compliance with all applicable laws and regulations that regulate the inclusion or use of controlled substances, including without l imitation, the eu rohs directive. akm assumes no liability for damages or losses occurring as a result of noncompliance with applicable laws and regulations. 6. resale of the product with provisions different from the statement and/or technical features se t forth in this document shall immediately void any warranty granted by akm for the product and shall not create or extend in any manner whatsoever , any liability of akm. 7. this document may not be reproduced or duplicated, in any form, in whole or in par t, without prior written consent of akm .

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