[ ak557 4 ] rev. 0.0 2014/0 6 - 1 - 1. general description the ak5 57 4 is a 32bit, 768khz sampling , differential input a/d c onverter for digital audio systems. it integrates an 4 - channel a/d converter, suitable for mixers and automotive amplifier units . the ak557 4 achieves 120 db dynami c range, 110 db s/(n+d) and 1 23 db dynamic range in mono mode while keeping low power consumption performance. four types of di gital filters are selectable according to the application . the ak55 7 4 can be easily connected to a dsp by supporting tdm audio form at s. 2. features ? sampling rate : 8khz ? 768khz ? f ull differential inputs ? 3 2bit digital filter - sharp roll - off filter - slow roll - off filter - short delay sharp roll - off filter - short delay slow roll - off filter ? s/(n+d): 1 10 db ? dr, s/n: 1 20 db (mono mode: 1 23 db) ? digital hpf ? power supply : 4.75~ 5.25v( analog ), 1.7~1.98v or 3.0 ? 3.6v( digital ) ? output format : 24/ 32 bit msb justified , i 2 s or tdm ? cascade tdm i/f: 16ch/48khz, 8 ch/96khz, 4ch/192khz ? dsd (64 fs, 128fs, 256 fs ) output data ? master & slave modes ? overflow flag ? 3 - wire serial and i 2 c p i / f ? power consumption : 302.2 mw (@ avdd=5.0v, tvdd=3.3v, fs=48khz) ? package : 4 8 - pin qfn 120db 768khz 32 - bit 4ch ? ? adc with 4filters ak55 7 4 = preliminary =
[ ak557 4 ] rev. 0.0 2014/0 6 - 2 - 3. block diagram voltage reference serial output interface delta - sigma modulator contr oller ldo decimation filter hpf tdmin/dsdor1 sdto1/dsdol2 sdto2/dsdor2 ain1p ain1n dp dif0/dsdsel0 dif1/dsdsel1 bick/dclk lrck/dsdol1 tdm0 tdm1 delta - sigma modulator decimation filter hpf delta - sigma modulator decimation filter hpf ain2p ain2n ain 4 p ain 4 n pdn mclk i2c hpfe dfil0 - 1 pw0 - 2 msn ovf vdd18 v r e f h 1 v r e f l 1 v r e f h 2 v r e f l 2 ldoe tvdd avdd avss dvss test1 - 2 ps/cad0_spi cks0/sda/cdti cks1/cad0_i2c/csn cks2/scl/cclk cks3/cad1 figure 1 . block diagram
[ ak557 4 ] rev. 0.0 2014/0 6 - 3 - 4. absolute maximum ratings (vss=0v; note 1 ) parameter symbol m in . m ax . unit power supplies analog (avdd pin) digital (t vdd pin) digital ( vdd 18 pin) ( note 2 ) avdd tvdd vdd18 ? 0.3 ? 0.3 ? 0.3 6.0 4.0 2.5 v v v input c urrent ( any pin except supplies ) iin - ? 10 ma analog input voltage (a in 1~8 p, ain1 - 8n pins) vina ? 0.3 avdd +0.3 v digital input voltage vind ? 0.3 t vd d +0.3 v ambient temperature (power applied) when the back tab is connected to vss when the back tab is ope n ta ta ? 40 ? 40 10 5 85 ? c storage temperature tstg ? 65 150 ? c note 1 . all voltages with respect to ground. note 2 . the 1.8v ldo is off (ldoe pin = ?l?) and an external power is supplied to the vdd 18 pin . warning: operation at or beyond these limits may result in permanent damage to the device. normal operation is not guaranteed at these extremes. 5. recommended operation conditions (vss=0v; note 1 ) parameter symbol m in . t yp . m ax . unit power supplies analog (avdd pin) avdd 4.75 5.0 5.25 v (ldoe pin= ? l?) ( note 3 ) io buffer (tvdd pin) ( note 4 ) digital core (vdd18 pin) tvdd vdd18 1.7 1.7 1.8 1.8 1.98 1.98 v v (ldoe pin= ? h?) ( note 5 ) io buffer (tvdd pin) tvdd 3.0 3.3 3.6 v voltage reference ( note 7 ) ?h? voltage reference ( note 6 ) vrefh1 - 4 4.75 5.0 5.25 v ?l? voltage reference vrefl1 - 4 - avss - v note 1 . all voltages with respect to ground. note 3 . tvdd must be powered up before vdd18 when the ldoe pin = ?l?. the power up sequence between avdd and tvdd or avdd and vdd18 is not critical. note 4 . tvdd must not exceed vdd18 0.1v when ldoe pin= ?l? . note 5 . when ldoe pin = ?h?, the internal ldo supplies 1.8v (typ). the power up sequences between avdd and tvdd is not critical. note 6 . vrefh1~4 pin must not exceed avdd+0.1v . note 7 . vrefl1 - 4 pins must be connected to avss. a nalog input voltage is proportional to {(vrefh ) ? (vrefl)} . vin (typ, @ 0db) = ? 2.8 ? {(vrefh ) ? (vref l )} / 5 [v]. * akm assumes no responsibility for the usage beyond the conditions in this data sheet.
[ ak557 4 ] rev. 0.0 2014/0 6 - 4 - 6. analog characteristics (ta=25 ? c ; av dd = 5 .0 v ; t v d d=3.3v, fs=48khz, 96khz; bick =64fs; signal frequency =1khz; 24bit data; measurement frequency=20hz ? 20khz at fs=48khz, 40hz ? 40khz at fs=96khz , 4 0hz ? 4 0khz at fs=192khz , unless otherwise specified. ) parameter m in . t yp . m ax . unit analog input chara cteristics: resolution - - 32 bits input voltage ( note 8 ) ? 2.7 ? 2.8 ? 2.9 vpp s/(n+d) fs=48khz bw=20khz ? 1dbfs ? 20dbfs ? 60dbfs 100 110 97 5 7 - - - db db db fs=96khz bw=40khz ? 1dbfs ? 20dbfs ? 60dbfs 110 90 50 - - - db db db fs=192khz bw=40khz ? 1dbfs ? 20dbfs ? 60dbfs - 110 90 50 - - - db db db dynamic range ( ? 60dbfs with a - weighted) stereo mode mono mode 112 - 1 20 1 23 - - db s/n (a - weighted) stereo mode mono mode 112 - 120 1 23 - - db input resistance 3.0 3.5 4.1 k ? interchannel isolation 110 120 db interchannel gain mismatch 0 0.5 db power supply rejection ( note 9 ) 60 - db power supplies power supply current normal operation ( pdn pin = ?h? ) avdd t vdd ( fs=48khz ) t vdd ( fs=96khz ) t vdd (fs=192khz) power down mode ( pdn pin = ?l? ) ( note 10 ) avdd+ t vdd 57.4 8.45 tbd tbd 10 tbd tbd tbd tbd 100 ma ma ma ma ? a note 8 . this value is (ainnp) ? (ainnn) that the adc output becomes full - scale (n=1~8) . input voltage is proportional to vrefh ? vrefl. vin = 0.56 ? ( vref h m ? vrefl m ) [vpp] . (m=1~4) note 9 . p sr r is applied to avdd, tvdd with 1khz, 20mvpp sine wave. the vrefh1 ~4 pin s are held to the same voltage. note 10 . all digital inputs are fixed to tvdd or tvss.
[ ak557 4 ] rev. 0.0 2014/0 6 - 5 - important notice 0. asahi kasei microdevices cor poration (?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 distributors 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 resp ect to the accuracy 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 respo nsible for use of 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 serious 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 equi pment, 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. though akm works continually to improve the product?s 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 ris k 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 a ny 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 products (mass destruction w eapons). when exporting the products 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 and regulations. the product s 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 representative for details as to environmental matters such a s 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 limitation, the eu rohs directive. akm assumes no liabilit y 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 set forth in this document shall immediately void any warra nty 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 part, without prior written consent of akm.
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