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[AKD4420-SC] km091904 2009/07 general description AKD4420-SC is an evaluation board for ak4420 (192khz sampling 24bit stereo ? dac with 2vrms output). AKD4420-SC has a digital audio interface ( ak4115) of optical input and can easily achieve the interface with digital audio syste m. therefore, it is easy to evaluate the sound quality of ak4420. ? ordering guide AKD4420-SC ---- ak4420 evaluation board function ? on-board digital audio interface. (ak4115) ak4115 a k4420 bnc connector rch lch dir opt in bnc connector torx141 port2 external reg:12 v->5 v vdd:5v v cc:3.3v coax in reg:12v->3.3v cvdd:5v figure 1. AKD4420-SC block diagram (* circuit diagram are attached at the end of this manual.) ak d4420-sc a k4420 evaluation board rev.2
[AKD4420-SC] km091904 2009/07 board outline chart ? outline chart figure 2. AKD4420-SC outline chart ? comment (1) lout, rout (bnc-jack) it is analog signal output jack. the signal is output from lout/rout pins. (2) coax, port1, port 2 (digital signal connector) coax (bnc-jack): digital signal (spdif, fs: 24 ? 48khz) is input to the ak4115. (default) port1 (optical connecter): optical digital signal (spdif, fs: 32 ? 48khz) is input to the ak4115. port2 (10 pin header): the clock and data can be input and output with this connector. (3) reg, vdd, agnd, cvdd, vcc these are the power supply connectors. connect power supply with these pins. as for the detail comments, refer to the setup of power supply in p3. (4) sw1, sw2 (switch) sw1: setting of frequency of mcko that is output from ak4115. sw2: reset of ak4115. keep ?h? during normal operation. vdd agnd sw2 u3 test1 port2 1 10 vcc cvdd reg t1 lout rout t2 coa x u2 1 sw1 h l u1 1 port1
[AKD4420-SC] km091904 2009/07 ? operation sequence 1) set up the power supply lines. each supply line should be distributed from the power supply unit. name of jack color of jack typ voltage voltage range using default setting vcc1 (note 1) red +12v +7 +15v avdd, dvdd, tvdd, ovdd of ak4115 and vcc of logic circuit (regulator:t2) connected to +12v vdd1 red +5v +4.5 +5.5v vdd of ak4420 connected to +5v cvdd1 red +5v +4.5 +5.5v cvdd of ak4420 connected to +5v agnd2 black 0v 0v ground connected to gnd ( should be connected ) reg (note 2) red +12v +7v~+15v vdd, cvdd of ak4420 (regulator:t1) open table 1.set up of power supply lines note 1 ) in case of using +3.3v power supply to connect vcc1 , it is possible to supply the voltage to ak4115 and the logic circuit without using regulator. in this case, change to r36: open ? short (0
); r34,r35: short (0
) ? open note 2 ) in case of using +12v power supply to connect reg, use regulator: t1 can supply ak4420 with clean voltage. in this case, change to r25,r44: short (0
) ? open; r37,r43:open ? short (0
); vdd, cvdd should be open. 2) dip switch setting: refer to table 2 and table 3 3) power down: the ak4115 should be reset once by bringing sw2 (ak4115 pdn) ?l? upon power-up. ? evaluation mode 1. using dir (optical link) the dir generates mclk, bick, lrck and sdata from the received data through optical connector (port1: torx141). it is possible to evaluate the ak4420 by using cd disk. setting: r19: open ? 470 ? ; r33: short (0 ? ) ? open 2. using dir (coax) (default) the dir generates mclk, bick, lrck and sdata from th e received data through bn c connector (j3). it is possible to evaluate the ak4420 by using cd disk. setting: r19: open; r33: short (0 ? ); (default) ? coax is recommended for an evaluation of the sound quality. 3. supply all interface signals th at includ master clock via po rt2 from external equipments.. setting: r11: 5.1 ? ? open r12, r13, r14: 51 ? open r15, r16, r17, r18: open ? 51 ? or short (0 ) note) the above work of removing (open) or shorting resistors need to modify the connection by soldering.
[AKD4420-SC] km091904 2009/07 ? setting of dip switch [sw1]: ak4115 setting no. pin off (?l?) on (?h?) default w y6 1 ocks0 off 2 ocks1 ak4115 ? s master clock setting look table 3 on table 2. sw1 setting ocks1 ocks0 mclk frequency 0 0/1 256fs @ fs=96khz 1 0 512fs @ fs=48khz 1 1 128fs @ fs=192khz default table 3. mclk clock setting ? setting of sw2 switch [sw2](pdn): reset of ak4115. keep ?h? during normal operation.
[AKD4420-SC] km091904 2009/07 measurement results [measurement condition] ? measurement unit : audio precisi on system two cascade (ap2) ? mclk : 512fs, 256fs, 128fs ? bick : 64fs ? fs : 44.1khz, 96khz, 192khz ? bit : 24bit ? power supply : vdd=cvdd=5v ? interface : dir ? temperature : room table data fs=44.1khz parameter input signal measurement filter lch rch s/(n+d) 1khz, 0db 20klpf 92.3 92.3 dr 1khz, -60db 20klpf, a-weighted 105.1 105.1 s/n ?0? data 20klpf, a-weighted 106.0 105.7 fs=96khz parameter input signal measurement filter lch rch s/(n+d) 1khz, 0db 40klpf 92.2 92.2 dr 1khz, -60db 40klpf, a-weighted 105.7 105.3 s/n ?0? data 40klpf, a-weighted 105.9 105.7 fs=192khz parameter input signal measurement filter lch rch s/(n+d) 1khz, 0db 40klpf 93.0 92.8 dr 1khz, -60db 40klpf, a-weighted 105.2 105.1 s/n ?0? data 40klpf, a-weighted 105.4 105.3
[AKD4420-SC] km091904 2009/07 plot data (fs=44.1khz) a km ak4420 fft vdd=cvdd=5v, mclk=512fs, fs=44.1khz, 0dbfs input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 20 20k 50 100 200 500 1k 2k 5k 10k hz figure 2. fft (0db) a km ak4420 fft vdd=cvdd=5v, mclk=512fs, fs=44.1khz, -60dbfs input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 20 20k 50 100 200 500 1k 2k 5k 10k hz figure 3. fft (-60db)
[AKD4420-SC] km091904 2009/07 a km ak4420 fft vdd=cvdd=5v, mclk=512fs, fs=44.1khz, no signal input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 20 20k 50 100 200 500 1k 2k 5k 10k hz figure 4. fft (no signal) a km ak4420 fft out of band noise vdd=cvdd=5v, mclk=512fs, fs=44.1khz, no signal input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 20 100k 50 100 200 500 1k 2k 5k 10k 20k 50k hz figure 5. fft (out of band noise)
[AKD4420-SC] km091904 2009/07 a km ak4420 s/(n+d) vs. input level vdd=cvdd=5v, mclk=512fs, fs=44.1khz, fin=1khz -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 dbfs -120 -80 -118 -116 -114 -112 -110 -108 -106 -104 -102 -100 -98 -96 -94 -92 -90 -88 -86 -84 -82 d b r a figure 6. s/(n+d) vs. input level a km ak4420 s/(n+d) vs. input frequency vdd=cvdd=5v, mclk=512fs, fs=44.1khz, 0dbfs input 20 20k 50 100 200 500 1k 2k 5k 10k hz -120 -80 -118 -116 -114 -112 -110 -108 -106 -104 -102 -100 -98 -96 -94 -92 -90 -88 -86 -84 -82 d b r a figure 7. s/(n+d) vs. input frequency
[AKD4420-SC] km091904 2009/07 a km ak4420 linearity vdd=cvdd=5v, mclk=512fs, fs=44.1khz, fin=1khz -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 dbfs -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a figure 8. linearity a km ak4420 frequency response vdd=cvdd=5v, mclk=512fs, fs=44.1khz, 0dbfs input 2k 20k 4k 6k 8k 10k 12k 14k 16k 18k hz -2 +1 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 +0 +0.2 +0.4 +0.6 +0.8 d b r a figure 9. frequency response
[AKD4420-SC] km091904 2009/07 a km ak4420 crosstalk vdd=cvdd=5v, mclk=512fs, fs=44.1khz, 0dbfs input 20 20k 50 100 200 500 1k 2k 5k 10k hz -130 -80 -125 -120 -115 -110 -105 -100 -95 -90 -85 d b figure 10. crosstalk
[AKD4420-SC] km091904 2009/07 (fs=96khz) a km ak4420 fft vdd=cvdd=5v, mclk=256fs, fs=96khz, 0dbfs input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 40 40k 50 100 200 500 1k 2k 5k 10k 20k hz figure 11. fft (0db) a km ak4420 fft vdd=cvdd=5v, mclk=256fs, fs=96khz, -60dbfs input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 40 40k 50 100 200 500 1k 2k 5k 10k 20k hz figure 12. fft (-60db)
[AKD4420-SC] km091904 2009/07 a km ak4420 fft vdd=cvdd=5v, mclk=256fs, fs=96khz, no signal input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 40 40k 50 100 200 500 1k 2k 5k 10k 20k hz figure 13. fft (no signal) a km ak4420 fft out of band noise vdd=cvdd=5v, mclk=256fs, fs=96khz, no signal input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 20 100k 50 100 200 500 1k 2k 5k 10k 20k 50k hz figure 14. fft (out of band noise)
[AKD4420-SC] km091904 2009/07 a km ak4420 s/(n+d) vs. input level vdd=cvdd=5v, mclk=256fs, fs=96khz, fin=1khz -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 dbfs -120 -80 -118 -116 -114 -112 -110 -108 -106 -104 -102 -100 -98 -96 -94 -92 -90 -88 -86 -84 -82 d b r a figure 15. s/(n+d) vs. input level a km ak4420 s/(n+d) vs. input frequency vdd=cvdd=5v, mclk=256fs, fs=96khz, 0dbfs input 40 40k 50 100 200 500 1k 2k 5k 10k 20k hz -120 -80 -118 -116 -114 -112 -110 -108 -106 -104 -102 -100 -98 -96 -94 -92 -90 -88 -86 -84 -82 d b r a figure 16. s/(n+d) vs. input frequency
[AKD4420-SC] km091904 2009/07 a km ak4420 linearity vdd=cvdd=5v, mclk=256fs, fs=96khz, fin=1khz -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 dbfs -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a figure 17. linearity a km ak4420 frequency response vdd=cvdd=5v, mclk=256fs, fs=96khz, 0dbfs input 2.5k 40k 5k 7.5k 10k 12.5k 15k 17.5k 20k 22.5k 25k 27.5k 30k 32.5k 35k 37.5k hz -2 +1 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 +0 +0.2 +0.4 +0.6 +0.8 d b r a figure 18. frequency response
[AKD4420-SC] km091904 2009/07 a km ak4420 crosstalk vdd=cvdd=5v, mclk=256fs, fs=96khz, 0dbfs input 40 40k 50 100 200 500 1k 2k 5k 10k 20k hz -130 -80 -125 -120 -115 -110 -105 -100 -95 -90 -85 d b figure 19. crosstalk
[AKD4420-SC] km091904 2009/07 (fs=192khz) a km ak4420 fft vdd=cvdd=5v, mclk=128fs, fs=192khz, 0dbfs input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 90 80k 200 500 1k 2k 5k 10k 20k 50k hz figure 20. fft (0db) a km ak4420 fft vdd=cvdd=5v, mclk=128fs, fs=192khz, -60dbfs input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 90 80k 200 500 1k 2k 5k 10k 20k 50k hz figure 21. fft (-60db)
[AKD4420-SC] km091904 2009/07 a km ak4420 fft vdd=cvdd=5v, mclk=128fs, fs=192khz, no signal input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 90 80k 200 500 1k 2k 5k 10k 20k 50k hz figure 22. fft (no signal) a km ak4420 fft out of band noise vdd=cvdd=5v, mclk=128fs, fs=192khz, no signal input -180 +0 -170 -160 -150 -140 -130 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a 20 100k 50 100 200 500 1k 2k 5k 10k 20k 50k hz figure 23. fft (out of band noise)
[AKD4420-SC] km091904 2009/07 a km ak4420 s/(n+d) vs. input level vdd=cvdd=5v, mclk=128fs, fs=192khz, fin=1khz -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 dbfs -120 -80 -118 -116 -114 -112 -110 -108 -106 -104 -102 -100 -98 -96 -94 -92 -90 -88 -86 -84 -82 d b r a figure 24. s/(n+d) vs. input level a km ak4420 s/(n+d) vs. input frequency vdd=cvdd=5v, mclk=128fs, fs=192khz, 0dbfs input 90 80k 200 500 1k 2k 5k 10k 20k 50k hz -120 -80 -118 -116 -114 -112 -110 -108 -106 -104 -102 -100 -98 -96 -94 -92 -90 -88 -86 -84 -82 d b r a figure 25. s/(n+d) vs. input frequency
[AKD4420-SC] km091904 2009/07 - 19 - a km ak4420 linearity vdd=cvdd=5v, mclk=128fs, fs=192khz, fin=1khz -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 dbfs -130 +0 -120 -110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 d b r a figure 26. linearity a km ak4420 frequency response vdd=cvdd=5v, mclk=128fs, fs=192khz, 0dbfs input 5k 80k 10k 15k 20k 25k 30k 35k 40k 45k 50k 55k 60k 65k 70k 75k hz -2 +1 -1.8 -1.6 -1.4 -1.2 -1 -0.8 -0.6 -0.4 -0.2 +0 +0.2 +0.4 +0.6 +0.8 d b r a figure 27. frequency response
[AKD4420-SC] km091904 2009/07 - 20 - a km ak4420 crosstalk vdd=cvdd=5v, mclk=128fs, fs=192khz, 0dbfs input 90 80k 200 500 1k 2k 5k 10k 20k 50k hz -130 -80 -125 -120 -115 -110 -105 -100 -95 -90 -85 d b figure 28. crosstalk
[AKD4420-SC] km091904 2009/07 - 21 - revision history important notice z these products and their specifications ar e subject to change without notice. when you consider any use or application of these products , please make inquiries the sales office of asahi kasei microdevices corporation (akm) or authorized distributors as to current status of the products. z akm assumes no liability for infringement of any patent, intellect ual property, or other rights in the application or use of any information contained herein. z any export of these products, or devices or systems containing them, may require an export license or other official approval under the law and regulations of the country of expor t pertaining to customs and tariffs, currency exchange, or strategic materials. z akm products are neither intended nor au thorized for use as critical components note1) in any safety, life support, or other hazard related device or system note2) , and akm assumes no responsibility for such use, except for the use approved with the express written consent by representative director of akm. as used here: note1) a critical component is one whose failure to func tion or perform may reasonably be expected to result, whether directly or indirectly, in the loss of the safety or effectiveness of the device or system containing it, and which must therefore meet very high standards of performance and reliability. note2) a hazard related device or system is one designed or intended for life support or maintenance of safety or for applications in medicine, aerospace, nuclear energy, or othe r fields, in which its failure to function or perform may reasonably be expected to result in loss of life or in significant injury or damage to person or property. z it is the responsibility of the buyer or distributor of akm pr oducts, who distributes, disposes of, or otherwise places the product with a third party, to notify such third party in advance of the above content and conditions, and the buyer or distributor agrees to assume any and all responsibility and liability for and hold akm harmless from any and all claims arising from the use of said product in the absence of such notification. date (yy/mm/dd) manual revision board revision reason page contents 08/01/15 km091900 0 first edition 12 circuit diagram was changed. : regulator: t2: ta48033f ? upc3533hf 1 figure 1. block diagram was replaced. change table 1. set up of power supply lines was replaced. 08/02/25 km091901 1 correction 3 set up of power supply lines and setting of evaluation mode: error correction table 1. set up of power supply lines:explanation changed. 3 n ote 1, note 2: explanation changed. 08/08/22 km091902 2 change 12 circuit diagram was changed. : r34,r35: open ? short r36: short ? open 09/04/17 km091903 2 change 12 circuit diagram was changed. : sw1: dss102 ? a6e-2104 09/07/09 km091904 2 modification 5-20 update of measurement results and plots.
a a b b c c d d e e e e d d c c b b a a cvdd vdd cvdd vdd vdd vcc vcc_r vcc vcc vdd vcc vcc_r vcc vcc_r vcc_r vcc_r vcc_r vcc_r vcc vcc_r vcc_r title size document number rev date: sheet of ak4420 2 ak4420-sc custom 11 thursday, july 09, 2009 title size document number rev date: sheet of ak4420 2 ak4420-sc custom 11 thursday, july 09, 2009 title size document number rev date: sheet of ak4420 2 ak4420-sc custom 11 thursday, july 09, 2009 vdd agnd +12v rout lout +12v-->+3.3v +12v-->+5v ak4115-pdn h ocks0 l l h ocks1 mclk dsp bick lrck sdto mclk bick stdi lrck vee dzf aoutl aoutr vss1 cvdd vss2 smute dif agnd vdd agnd vdd +3.3v coax +12v +5v + c4 10u + c4 10u + c30 4.7u + c30 4.7u r15 (open) r15 (open) r26 10k r26 10k + c26 10u + c26 10u + c40 470u + c40 470u 1 2 r1 (open) r1 (open) c37 0.1u c37 0.1u u3 74hc14 u3 74hc14 gnd 7 1a 1 3a 5 5a 11 5y 10 3y 6 1y 2 2y 4 4y 8 6y 12 6a 13 4a 9 2a 3 vcc 14 r22 5.1 r22 5.1 r9 (open) r9 (open) r10 (short) r10 (short) c43 0.1u c43 0.1u + c28 10u + c28 10u + c6 10u + c6 10u c39 0.1u c39 0.1u c22 0.1u c22 0.1u r44 (short) r44 (short) c13 (open) c13 (open) r38 (short) r38 (short) reg(+12/5v) t45-red reg(+12/5v) t45-red 1 r4 560 r4 560 test3 test3 c18 0.1u c18 0.1u l4 (short) l4 (short) 1 2 r35 (short) r35 (short) c9 2.2nf c9 2.2nf ak4420 u1 ak4420 u1 cn 1 cp 2 smute 3 mclk 4 bick 5 sdti 6 lrck 7 dif 8 aoutr 9 aoutl 10 vdd 11 vss1 12 dzf 13 cvdd 14 vss2 15 vee 16 c38 0.1u c38 0.1u r16 (open) r16 (open) r36 (open) r36 (open) r30 (open) r30 (open) c45 0.1u c45 0.1u c20 0.1u c20 0.1u r20 (short) r20 (short) r28 (open) r28 (open) r24 47k r24 47k r42 (open) r42 (open) c27 0.1u c27 0.1u r40 10 r40 10 r11 5.1 r11 5.1 cvdd1 t45-red cvdd1 t45-red 1 c23 0.1u c23 0.1u r41 (open) r41 (open) + c36 47u + c36 47u + c33 10u + c33 10u c34 0.1u c34 0.1u c48 0.1u c48 0.1u c16 0.1u c16 0.1u r6 (short) r6 (short) c3 0.1u c3 0.1u r23 47k r23 47k r31 10k r31 10k c5 0.1u c5 0.1u + c19 10u + c19 10u + c42 47u + c42 47u 1 2 + c17 47u + c17 47u r2 (open) r2 (open) r32 75 r32 75 j2 bnc-r-pc j2 bnc-r-pc 1 2 3 4 5 c29 0.1u c29 0.1u r14 51 r14 51 + c8 (short) + c8 (short) r5 (short) r5 (short) vcc1 t45-red vcc1 t45-red 1 c11 (open) c11 (open) r25 (short) r25 (short) j1 bnc-r-pc j1 bnc-r-pc 1 2 3 4 5 + c7 (short) + c7 (short) r33 0 r33 0 r43 (open) r43 (open) r29 (open) r29 (open) test2 test2 r45 (open) r45 (open) port1 torx141 port1 torx141 out 1 vcc 3 gnd 2 + c15 (open) + c15 (open) + c44 470u + c44 470u r3 560 r3 560 l3 (short) l3 (short) 1 2 + c35 470u + c35 470u r7 (open) r7 (open) vdd1 t45-red vdd1 t45-red 1 sw1 a6e-2104 sw1 a6e-2104 1 2 4 3 t2 upc3533hf t2 upc3533hf out 3 gnd 2 in 1 + c24 10u + c24 10u r17 (open) r17 (open) u2 ak4115 u2 ak4115 dif0/rx5 1 test 2 dif1/rx6 3 xsel/rx7 5 dvdd 6 vin 7 daux 8 dvss 9 mcko1 10 mcko2 11 ovdd 12 ovss 13 bick 14 sdto 15 lrck 16 b 17 c 18 u 19 vout 20 tvdd 21 tx0 22 txp1 23 txn1 24 tvss 25 xti1 26 xto1 27 xti2 28 xto2 29 ovdd 30 ovss 31 ebick 32 emck 33 elrck 34 int0 35 int1 36 cm0/cdto/cad1 37 cm1/cdti/sda 38 ocks1/cclk/scl 39 ocks0/csn/cad0 40 dvss 42 bvss 43 ips1/iic 44 psel 45 xtl0 46 xtl1 47 filt 48 avss 49 r 50 vcom 51 avdd 52 p/sn 53 acks 54 rxn0 55 rxp0 56 avss 57 rx1 58 avdd 59 rx2 60 avss 61 rx3 62 avdd 63 ips0/rx4 64 pdn 4 dvdd 41 r19 (open) r19 (open) r39 5.1 r39 5.1 c41 0.1u c41 0.1u test1 test1 r18 (open) r18 (open) r34 (short) r34 (short) c32 0.1u c32 0.1u c14 (open) c14 (open) c21 0.1u c21 0.1u c2 1u c2 1u agnd2 t_45(black) agnd2 t_45(black) 1 l1 47u l1 47u 1 2 d1 hsu119 d1 hsu119 k a r27 (open) r27 (open) r13 51 r13 51 sw2 ate1d-2m3 sw2 ate1d-2m3 2 1 3 c25 0.1u c25 0.1u r21 (short) r21 (short) j3 bnc-r-pc j3 bnc-r-pc c12 (open) c12 (open) c1 1u c1 1u t1 njm78m05fa t1 njm78m05fa out 3 gnd 2 in 1 c31 0.1u c31 0.1u l2 (short) l2 (short) 1 2 r8 (short) r8 (short) r37 (open) r37 (open) port2 a1-10pa-2.54dsa port2 a1-10pa-2.54dsa 1 2 3 4 5 6 7 8 9 10 r12 51 r12 51 c10 2.2nf c10 2.2nf

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