asahi kasei [akd5383 rev.b] 00/05 - 1 - general description the akd5383 is an evaluation board for the ak5383 professional audio 24bit a/d converter. the akd5383 includes the input buffer circuit and also has a digital interface transmitter. further, the akd5383 can evaluate direct interface with akms dac evaluation boards. n ordering guide akd5383 rev.a --- evaluation board for ak5383vs akd5383 rev.b --- evaluation board for AK5383VF function on-board full-differential input buffer circuit on-board clock generator compatible with 2 types of interface 1) direct interface with akms dac evaluation boards.. 2) on-board cs8402 as dit which transmits optical output. a bnc connector for an external clock input. * circuit diagram and pcb layout are attached at the end of this manual. evaluation board rev.b for AK5383VF akd5383 input buffer ak5383 clock generator d/a data 10pin header lch rch +5v gnd cs8402 (dit) opt out - 15v +3.3v +15v
asahi kasei [akd5383 rev.b] 00/05 - 2 - n input buffer circuit the akd5383 includes full-differential input buffer circuit with an inverted-amp(gain:-10db). the capacitor of 10nf between ain+ /- decreases the clock feed through noise of modulator, and composes a 1st order lpf(fc=360khz) with 22ohm resistor before the capacitor. this circuit also has a 1st order lpf(fc=370khz) composed of op-amp. external analog signal can be fed through the bnc connector or the cannon connector. 4.7k - + - + 22 3k 910 - + 22 910 ak5393 ain+ ain- cal zcal analog in 8.1vpp "l" at self calibration 47 47 njm5532 va= 5v vp= 15v 4.7k 10 + 10k 10k 0.1 bias va+ 2.45vpp 2.45vpp vp+ vp- bias 470p 3k 470p bias 10n figure 1. full-differential input buffer circuit example 1: in case of using the bnc connector [jp2,jp3,jp4,jp5]: short [r11,r18]: open the resistor value of r10 and r19 should be properly selected in order to much the output impedance of the signal source. 2: in case of using the cannon connector [jp2,jp3,jp4,jp5]: open the resistor value of r10, r11, r18 and r19 should be properly selected in order to much the output impedance of the signal source. * akm assumes no responsibility for the trouble when using the above circuit examples. n power supply and decoupling va and vd supplies to the ak5383 are decoupled separately in order to minimize the effect of the digital noise. a system analog supply is fed to va. va and vd lines should be distributed separately from the power unit. decoupling capacitors are connected to ak5383 as near as possible, particularly the ceramic capacitor to the vrefl/r pin.
asahi kasei [akd5383 rev.b] 00/05 - 3 - n operation sequence (1) set up the power supply lines vp+=+15v, vp- = -15v, va+=+5v, vd+=+3.3v ~ 5.25v, agnd=dgnd=0v each supply line should be distributed from the power unit. (2) set up the evaluation modes and jumper pins.(see next item) there are many jumper pins to cover many evaluation modes. please take care of setting. (3) set up the dip sw position for the dit.(see next item) this does not affect ak5383 operation. (4) power on. the ak5383 should be reset once by bringing pd "l"(sw4) upon power-up. (5) ak5383 can be reset by sw4 during operation. lower position resets the device, and the upper position is for normal operation. note: in any case of changing clocks during operation, the device should be reset by bringing pd "l". if not followed, the ak5383 may be destroyed since its internal logic uses dynamic circuit. n the evaluation modes and corresponding jumper pin settings. 1. evaluation mode applicable evaluation mode 1-1 using d/a converter board for the analog performance analysis. 1-2 dit (optical link) [default] 1-3 all interface signals(mclk, bick and lrck) are fed from external circuit. 1-4 feed all interface signals to the external circuit through port2. 1-1. using d/a converter board for the analog performance analysis. the ak5383 can be evaluated by distortion analyzer using various akm's d/a converter evaluation boards through port2. [slave mode] figure 2. jumper set up (d/a) jp9 lr jp7 bc jp11 mclk ext xtl jp12 xte
asahi kasei [akd5383 rev.b] 00/05 - 4 - 1-2dit (optical link) port1 is used. dit generates audio bi-phase signal from received data and which is output through optical connector(totx174). it is possible to connect akm's d/a converter evaluation boards on the digital-amplifier which equips dir input. there are two kinds of jumper setting depend on the smode1 and smode2 pin. the interface signals are output from port2.(see the (4)). in case of using external clock through a bnc connector, select ext on jp11(mclk) and short jp12(xte). [slave mode] (default) [master mode] figure 3. jumper set up (dit) 1-3 all interface signals(mclk, bick and lrck) are fed from external circuit. [slave mode] under the following set-up, mclk, lrck and sclk signals needed for the a/d to operate could be fed through port2. figure 4. jumper set up (ext) 1-4 feed all interface signals to the external circuit through port2. [master, slave mode] please set up as same as 1-2. all interfacing signal which drive ak5383 are output through port2. however, the fsync signal is input when the position of the sdata is needed to be controlled. * setting for double speed sampling(fs=96khz) for the double speed sampling, dfs="l", mclk=128fs, bick=64fs(max) are required. so, when bick and lrck are created from 74hc4040 on the board, the crystal oscillator should be changed to 24.576mhz and set jp14(mclk2) to 128fs side(see the schematics). 2. bit clk(bcf) set up [jp8] either 64fs or 128fs for the bcf can be selected. figure shows 128fs example. when dfs="h", set jp8 to 64 side. 128: 128fs is fed to ak5383 as bick. 64: 64fs is fed to ak5383 as bick. j p9 jp7 bc jp11 mclk ext xtl jp12 xte lr jp8 64 128 bcf jp9 jp7 bc jp11 mclk ext xtl jp12 xte lr jp9 jp7 bc jp11 mclk ext xtl jp12 xte lr
asahi kasei [akd5383 rev.b] 00/05 - 5 - 3. jumper-set up and explanation set up the cs8402's data format corresponding the serial data interface of the ak5383. akd5383 data format smode2 (sw2-5) smode1 (sw2-4) 8402 (sw2-1) bcf (jp6) lrp (jp10) slave mode on on on f h mater mode on off off r l i 2 s slave mode off on off r h i 2 s master mode off off off r h *dip-sw is on=l off=h table 1. serial data interface of ak5383 and cs8402 [sw2-1]: cs8402's data format on: msb justified, 24bit off:iis compatible [jp6] : define the polarity of sclk. f:sclk is inverted. r:sclk coincides with ak5383 [jp10]: define the polarity of lrck. l:lrck is inverted. h:lrck coincides with ak5383. 4. the other function set up no. pin on off 1 8402 see the table1. 2 dfs 48k 96k 3 hpfe disable enable 4 sm1 5 sm2 seethe table 1. 6 calmode vcom ain *dip-sw is on=l off=h ? selects the sampling rate. ? selects hpf of ak5383. ? selects the reference signal for offset-cal of k5383 table 2. dip-sw2 set-up vcom:vcoml,vcomr pin ain: analog input pin (ainl ,ainr ) [jp13] : selects the analog power supply source to va pin of the ak5383. open: supply from the power supply terminal(va+). short: supply from 3-terminal voltage regulator(+5v) on the board. n the function of the toggle sw. [sw3] resets the cs8402. upper position resets the internal counter of cs8402, then bi-phase signal is not output. keep the "l" position during normal operation. [sw4] resets the ak5383. keep the "h" position during conversion.
asahi kasei [akd5383 rev.b] 00/05 - 6 - n dip switch set up. (default is the consumer mode.). the dip-sw1 sets the c-bit of cs8402. this set up does not affect the evaluation of the ak5383. in case of using dit, need to set it up correctly. for more detailed configurations, please refer to the cs8402 data-sheet. switch off=0,on=1 contents 8 pro = 0 professional mode, c0=1 7,6 c6 , c7 c6,c7 - sampling frequency 11 10 01 00 00 - not indicated. receiver default to 48khz. 01 - 48khz 10 - 44.1khz 11 - 32khz 5c9 c8,c9,c10,c11 - 1bit of channel mode 1 0 0000 - mode not indicated. receiver default to 2-channel mode. 0100 - stereophonic. 4c1 c1 - audio mode 1 0 0 - normal audio 1 - not audio 3 trnpt transparent mode *cs8402 is cre 0 1 normal mode transparent mode 1,2 em1,em0 c2,c3,c4 - encoded audio signal emphasis 1 1 1 0 0 1 0 0 000 - emphasis not indicated. receiver defaults to no emphasis with manual override enable. 100 - none 110 - 50/15usec 111 - ccitt j.17 table 3. dip switch set up of cs8402(professional mode) switch off=0,on=1 contents 8 pro = 0 consumer mode, c0=0 (default) 7c2 c2 - copy default 1 0 0 - copy inhibited 1 - copy permitted 6c3 c3,c4,c5 - pre-emphasis default 1 0 000 - none 100 - 50/15usec 5 c15 c15 - generation status default 1 0 0 - see the standard 1 - see the standard 3,4 fc1, fc0 c24,c25,c26,c27- sampling frequency default 00 01 10 11 0000 - 44.1khz 0100 - 48khz 1100 - 32khz 0000 - 44.1khz, cd mode 1,2 c8 , c9 c8-c14 - category code default 1 1 1 0 0 1 0 0 0000000 - general 0100000 - pcm encoder/decoder 1000000 - cd 1100000 - dat table 4. dip switch set up of cs8402(consumer mode)
asahi kasei [akd5383 rev.b] 00/05 - 7 - important notice these products and their specifications are subject to change without notice. before considering any use or application, consult the asahi kasei microsystems co., ltd. (akm) sales office or authorized distributor concerning their current status. akm assumes no liability for infringement of any patent, intellectual property, or other right in the application or use of any information contained herein. 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 export pertaining to customs and tariffs, currency exchange, or strategic materials. akm products are neither intended nor authorized for use as critical components in any safety, life support, or other hazard related device or system, and akm assumes no responsibility relating to any such use, except with the express written consent of the representative director of akm. as used here: (a) 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 other 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. (b) a critical component is one whose failure to function 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. it is the responsibility of the buyer or distributor of an akm product who distributes, disposes of, or otherwise places the product with a third party to notify that 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.
asahi kasei [akd5383 rev.b] 00/05 - 8 - ak5383 measurement result [measurement condition] measurement unit : rohde & schwarz, upd04 fs : 48khz, 96khz bw : 20hz ~ 20khz (fs=48khz), 40hz ~ 40khz (fs=96khz) power supply : avdd=3.3v, dvdd=5v interface : dit (fs=48khz), serial multiplex (fs=96khz) temperature : room fs 48khz 96khz filter -103.2 -100.5 -87.8 -82.7 thd+n (-20db) (-60db) -47.8 -42.7 107.8 102.8 dr 111.0 109.7 a-weighted 107.8 102.8 s/n 111.0 109.7 a-weighted unit [db] [db] < plot fs=48khz figure 1. fft (input level = -1db ) figure 2. fft (input level = -60db) figure 3. fft (input level =-120db) figure 4. fft (input =0data) figure 5. thd+n vs input frequency (input level=-1db) figure 6. thd+n vs input level (fin=1khz) figure 7. linearity figure 8. frequency response figure 9. crosstalk fs=96khz figure 10. fft (input level = -1db ) figure 11. fft (input level = -60db) figure 12. fft (input level =-120db) figure 13. fft (input =0data) figure 14. thd+n vs input frequency (input level=-1db) figure 15. thd+n vs input level (fin=1khz) figure 16. linearity figure 17. frequency response figure 18. crosstalk
ak5383(48khz) fig.1 fft ( @ -1db) fig.2 fft ( @ -60db )
ak5383(48khz) fig.3 fft ( @ -120db ) fig.4 fft ( @ 0data )
ak5383(48khz) fig.5 thd+n vs. input frequency ( @-1db) fig.6 thd+n vs. input level ( @ frequency = 1khz)
ak5383(48khz) fig.7 linearity fig.8 frequency response(including external hpf&lpf)
ak5383(48khz) fig.9 crosstalk
ak5383(96khz) fig.1 fft ( @ -1db) fig.2 fft ( @ -60db )
ak5383(96khz) fig.3 fft ( @ -120db ) fig.4 fft ( @ 0data )
ak5383(96khz) fig.5 thd+n vs. input frequency ( @-1db) fig.6 thd+n vs. input level ( @ frequency = 1khz)
ak5383(96khz) fig.7 linearity fig.8 frequency response(including external hpf&lpf)
ak5383(96khz) fig.6 crosstalk
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