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ic-pd 3948 phased array sine encoder rev c1, page 1/ 12 features ? compact, 5-channel encoder sensor with differential scanning and analog sine/cosine outputs: 2048 cpr with index, 1 cpr absolute, size ? 39 mm ? phased-array design for excellent signal matching ? reduced cross talk due to moderate track pitch ? ultra low dark currents for operation up to high temperature ? low noise ampli?ers with high transimpedance ? short-circuit-proof, low impedance voltage outputs for enhanced emi tolerance ? space saving optoqfn and optobga packages (rohs compliant) ? low power consumption from single 4.5 to 5.5 v supply ? operational temperature range of -40 to +110 c ? suitable code disc: pd2s 39-2048 (glass 1 mm) od ? 39 mm, id ? 18.0 mm, optical radius 17.5 mm applications ? incremental sine encoders with commutation information ? motor feedback ? ac servo and bldc motor systems packages 15-pin optobga 6.2 mm x 5.2 mm x 1.7 mm 32-pin optoqfn 5 mm x 5 mm x 0.9 mm block diagram copyright ? 2008, 2014 ic-haus http://www.ichaus.com p r e l i m i n a r y p r e l i m i n a r y ! "# $ "%&' "'(! !# "% !%&' !%&' " !% !'(! )*+, *+,+*+!%+ - " !# $- - "% $ - )%% " "%&' # - $ - - - "'(! - $- !%&' )* % )&./01+ - $ - ! ! 1! !% $ "% $ - )*'% !# !'(! $ $ $ ic-pd3948 !'(! "'(! $ !% "# "%&' $
ic-pd 3948 phased array sine encoder rev c1, page 2/ 12 description ic-pd3948 is an optical sensor ic with integrated photodiodes whose signal currents are converted into output voltages by low-noise transimpedance ampli?ers. due to a high transimpedance gain of typically 4 m
(*1 m
/2 m
), output signal voltages of several hun- dred millivolts are obtained at illumination levels of just 1 to 3 mw/cm 2 (*6 to 18 mw/cm 2 ). in most cases complicated noise suppression measures are thus rendered unnecessary. as the pin names would suggest, ic-pd3948 is typ- ically applied as a sine encoder for motor feedback systems. to this end, ic-pd3948 provides sine and cosine signals with both a high resolution of 2048 cpr (plus an additional index signal) and a low res- olution of 1 cpr (at c/d). all code disc signal tracks are evaluated differential; the high resolution sine signals are read by photo- diodes in a phased array. the layout of the signal ampli?ers is such that there is good paired channel matching, reducing the time and effort required for calibration to an absolute minimum. the spectral sensitivity ranges from visible to near infrared light, with the maximum sensitivity close to a wavelength of 680 nm. an output voltage of 1 v is typical in low light conditions, for instance when ic- pd is illuminated at only 2 mw/cm 2 (*12 mw/cm 2 ) by a 740 nm led. a relatively low led current is enough to operate the sensor, proving bene?cial to the life ex- pectancy of the led at high operating temperatures. hd phased arrays are designed for ?delity and ro- bustness. ultra-low signal distortion is obtained at increased tolerances for alignment and random code defects (e.g. due to dust). for information on chip releases, refer to chapter de- sign review. *) data refers to chip release ic-pd3948 y. p r e l i m i n a r y p r e l i m i n a r y
ic-pd 3948 phased array sine encoder rev c1, page 3/ 12 packaging information pad layout chip release . (2.88 mm x 3.37 mm) pad functions no. name function refer to the description of pin functions. pad layout chip release y, y1 (2.88 mm x 3.37 mm), hd phased array pad functions no. name function refer to the description of pin functions. p r e l i m i n a r y p r e l i m i n a r y
ic-pd 3948 phased array sine encoder rev c1, page 4/ 12 pin configuration obga lsh2c (6.2 mm x 5.2 mm) pin functions no. name function a2 vcc +4.5...5.5 v supply voltage a3 vref reference voltage output a4 gnd ground b1 psin sine track + b2 nsin sine track - b3 vrdc d/c track reference b4 vrsc s/c track reference c1 pcos cosine track + c2 ncos cosine track - c3 nc c track - c4 pc c track + d1 z z index signal d2 nz z index track - d3 nd d track - d4 pd d track + note: all signal and reference outputs are analog voltage outputs. ic top marking: = product code, = assembly code (subject to changes); for dimensional speci?cations refer to the relevant package data sheet, available separately. pin configuration oqfn32-5x5 (5 mm x 5 mm) pin functions no. name function 1 vcc +4.5...5.5 v supply voltage 2 vref reference voltage output 3 psin sine track + 4 nsin sine track - 5 pcos cosine track + 6 ncos cosine track - 7 z z index signal 8 nz z index track - 9..16 n.c. 1) 17 nd d track - 18 pd d track + 19 nc c track - 20 pc c track + 21 vrdc d/c track reference 22 vrsc s/c track reference 23 n.c. 1) 24 gnd ground 25..32 n.c. 1) bp backside paddle 2) note: all signal and reference outputs are analog voltage outputs. ic top marking: = product code, = assembly (subject to changes); 1) pin numbers marked n.c. are not connected. 2) connecting the backside paddle is recommended by a single link to gnd. a current ?ow across the paddle is not permissible. p r e l i m i n a r y p r e l i m i n a r y a b c d 1 2 3 4

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

ic-pd 3948 phased array sine encoder rev c1, page 5/ 12 package dimensions p r e l i m i n a r y p r e l i m i n a r y 5 5 1.90 3.24 g4 top 0.90 0.10 0.30 side 3.60 3.60 0.50 0.23 0.40 bottom 3.60 3.60 0.50 0.30 4.90 4.90 r 0.15 0.70 recommended pcb-footprint drb_pdxx-oqfn32-2_pack_1, 10:1 all dimensions given in mm. tolerances of form and position according to jedec mo-220. positional tolerance of sensor pattern: 70m / 1 (with respect to center of backside pad). g4: radius of chip center (refer to the relevant encoder disc and code description). maximum molding excess +20m / -75m versus surface of glass/reticle.
ic-pd 3948 phased array sine encoder rev c1, page 6/ 12 absolute maximum ratings these ratings do not imply operating conditions; functional operation is not guaranteed. beyond these ratings device damage may occur. item symbol parameter conditions unit no. min. max. g001 vcc voltage at vcc -0.3 6 v g002 i(vcc) current in vcc -20 20 ma g003 v() pin voltage, all signal outputs -0.3 vcc + 0.3 v g004 i() pin current, all signal outputs -20 20 ma g005 vd() esd susceptibility, all pins hbm, 100 pf discharged through 1.5 k
2 kv g006 tj junction temperature -40 150 c g007 ts chip storage temperature -40 150 c thermal data operating conditions: vcc = 4.5...5.5 v item symbol parameter conditions unit no. min. typ. max. t01 ta operating ambient temperature range package obga lsh2c -40 110 c package oqfn32-5x5 -40 110 c (extended temperature range of -40 to 125 c available on request) t02 ts storage temperature range package obga lsh2c, -40 110 c package oqfn32-5x5 t03 tpk soldering peak temperature package obga lsh2c tpk < 20 s, convection re?ow 245 c tpk < 20 s, vapor phase soldering 230 c tol (time on label) 8 h; please refer to customer information ?le no. 7 for details. t04 tpk soldering peak temperature package oqfn32-5x5 tpk < 20 s, convection re?ow 245 c tpk < 20 s, vapor phase soldering 230 c msl 5 a (max. ?oor live 24 h at 30 c and 60 % rh); please refer to customer information ?le no. 7 for details. all voltages are referenced to ground unless otherwise stated. all currents ?owing into the device pins are positive; all currents ?owing out of the device pins are negative. p r e l i m i n a r y p r e l i m i n a r y
ic-pd 3948 phased array sine encoder rev c1, page 7/ 12 electrical characteristics operating conditions: vcc = 4.5...5.5 v, tj = -40..125 c, unless otherwise stated item symbol parameter conditions unit no. min. typ. max. total device 001 vcc permissible supply voltage 4.5 5.5 v 002 i(vcc) supply current no load, photocurrents within op. range 12 16 ma 003 vc()hi clamp-voltage hi at all pins i() = 4 ma 11 v 004 vc()lo clamp-voltage lo at all pins i() = -4 ma -1.2 -0.3 v photosensors 101 ar spectral application range se( ar) = 0.25 x s( pk) 400 950 nm 102 pk peak sensitivity wavelength 680 nm 103 aph() radiant sensitive area chip release ic-pd3948. s/c track (dpsin, dnsin, dpcos, dncos) 0.075 mm 2 c/d track (dpc, dnc, dpd, dnd) 0.033 mm 2 z track (dpz, dnz) 0.042 mm 2 chip release ic-pd3948 y s/c track (dpsin, dnsin, dpcos, dncos) 0.076 mm 2 c/d track (dpc, dnc, dpd, dnd) 0.031 mm 2 z track (dpz, dnz) 0.039 mm 2 104 s( ) spectral sensitivity led = 740 nm 0.5 a/w led = 850 nm 0.3 a/w 106 e()mx irradiance for maximum signal level led = 740 nm, vout() not saturated; chip release ic-pd3948. s/c track 1.2 2.0 3.2 mw/ cm 2 c/d track 2.4 4.0 6.4 mw/ cm 2 z track 1.9 3.0 4.8 mw/ cm 2 chip release ic-pd3948 y s/c track 6.0 12 18 mw/ cm 2 c/d track 8.0 15 24 mw/ cm 2 z track 12 21 36 mw/ cm 2 photocurrent ampli?ers 201 iph() permissible photocurrent operating range chip release ic-pd3948., all tracks 0 280 na chip release ic-pd3948 y s/c track and z track 0 1120 na c/d track 0 560 na 202 ()r photo sensitivity (light-to-voltage conversion ratio) led = 740 nm; chip release ic-pd3948., all tracks 0.8 1.2 2.0 v/w chip release ic-pd3948 y s/c track, z track 0.1 0.16 0.3 v/w c/d track 0.2 0.32 0.6 v/w 203 z() equivalent transimpedance gain z = vout() / iph(); chip release ic-pd3948., all tracks 2.69 4.0 5.46 m
chip release ic-pd3948 y s/c track, z track 0.67 1.0 1.36 m
c/d track 1.34 2.0 2.72 m
204 tcz temperature coef?cient of transimpedance gain -0.12 %/ c 209 z()pn transimpedance gain matching of paired ampli?ers p.. channel vs. corresponding n.. channel -0.2 0.2 % 210 vout()pn signal matching no illumination, any output to any output -35 35 mv 211 vout()pn signal matching no illumination, p vs. n path per diff. channel -2.5 2.5 mv p r e l i m i n a r y p r e l i m i n a r y
ic-pd 3948 phased array sine encoder rev c1, page 8/ 12 electrical characteristics operating conditions: vcc = 4.5...5.5 v, tj = -40..125 c, unless otherwise stated item symbol parameter conditions unit no. min. typ. max. 212 fc()hi cut-off frequency (-3 db) chip release ic-pd3948. 120 180 280 khz chip release ic-pd3948 y 240 360 560 khz 213 vnoise() rms output noise illuminated to 500 mv signal level above dark level, 500 khz band width 0.5 mv signal outputs 301 vout()mx permissible maximum output voltage illumination to e()mxr, linear gain 2.45 2.72 3.02 v 302 vout()d dark signal level no illumination, load 20 k
vs. +2 v; 560 770 1000 mv 303 vout()acmx maximum signal level vout()acmx = vout()mx - vout()d 1.48 1.96 2.35 v 304 isc()hi short-circuit current hi load current to ground 100 420 800 a 305 isc()lo short-circuit current lo load current to ic 250 480 700 a 306 ri() internal output resistance f = 1 khz 70 110 180
signal references vrsc, vrdc 401 vout() reference voltage 560 770 1000 mv 402 isc()hi short-circuit current hi current to ground 100 420 800 a 403 isc()lo short-circuit current lo current to ic 250 480 700 a 404 ri() internal output resistance 70 110 180
reference voltages vref 501 vout() reference voltage i(vref) = -100 a...+300 a 560 770 1000 mv 502 dvout() load balancing i(vref) = -100 a...+300 a -10 +10 mv 503 isc()hi short-circuit current hi current to ground; chip release ic-pd3948. 200 420 800 a chip release ic-pd3948 y 600 1100 1600 a 504 isc()lo short-circuit current lo current to ic 0.5 4.5 10 ma p r e l i m i n a r y p r e l i m i n a r y
ic-pd 3948 phased array sine encoder rev c1, page 9/ 12 application circuits figure 1: application example of a motor feedback encoder utilizing two ic-msb devices. sine square plus cosine square led power controlling by ic-msb maintains the differential 1 vpp signal of the s/c channel featuring 2048 cpr. the c/d channel with 1 cpr is initially also calibrated to 1 vpp differential, but experiences variation due to led power controlling. this variation can be neglected at speeds below 1,500 rpm, as ic-pd3948 does not run into cut-off frequency. p r e l i m i n a r y p r e l i m i n a r y r e v e r s e i c - m s b p o l a r i t y p r o t e c t i o n s i g n a l l e v e l c o n t r o l d i s c i c - p d 3 9 4 8 r e v e r s e i c - m s b p o l a r i t y p r o t e c t i o n g n d s v d d v d d s s c l x 1 n c p s s i g n a l l e v e l c o n t r o l x 2 x 3 x 4 x 5 x 6 s d a n s e r r n c x 3 v c c n z a c o s c l v d d s g n d v r d c v r s c v r e f x 1 p z g n d a c o p c n z p c n d p s i n p d n s i n p c o s n c o s p z g n d s v d d s d a x 6 g n d x 2 p z x 4 x 5 n s e r r p s n z n c p c + - c 1 1 f i c - t l 8 5 d 3 + - + - + - d n c o s c 4 1 0 0 n f 2 . 2 k r 6 d n c 2 . 2 k + - d p c r 5 r 7 2 . 2 k r 1 1 0 0 n f c 2 1 k - t v s - d i o d e - a r r a y + t v s - d i o d e - a r r a y d 2 2 . 2 k c 5 1 0 0 n f 1 0 0 n f c 6 r 8 d n s i n 1 0 0 n f c 7 d n z 1 f c 3 d p z d n d r 9 4 7 d p s i n d p d d p c o s v p i 2 c v p v n p s i n p z n z p c o s n c o s n s i n + 5 v s d a p c n c p d n d 2 4 x x 2 4 x x e r r s d a s c l v n s c l i 2 c v n d 3 i c - t l 8 5 1 f c 1 d p c 2 . 2 k r 5 r 6 2 . 2 k d n c d n c o s 1 0 0 n f c 4 t v s - d i o d e - a r r a y c 2 1 0 0 n f r 1 1 k 2 . 2 k r 7 c 7 1 0 0 n f c 6 1 0 0 n f 2 . 2 k r 8 1 0 0 n f c 5 t v s - d i o d e - a r r a y d 2 c 3 1 f d p z d n z d n s i n d p s i n d p d d p c o s 4 7 r 9 d n d
ic-pd 3948 phased array sine encoder rev c1, page 10/ 12 figure 2: application example motor feedback encoder utilizing ic-msb and ic-msa. sine square plus cosine square led power controlling by ic-msb maintains the differential 1 vpp signal of the s/c channel featuring 2048 cpr. the c/d channel with 1 cpr ensures its 1 vpp differential signal by automatic gain control. in this setup, operation at high rpm speed and beyond ic-msbs cut-off frequency is possible. p r e l i m i n a r y p r e l i m i n a r y i c - m s b i c - m s a p r o t e c t i o n s i g n a l l e v e l c o n t r o l d i s c i c - p d 3 9 4 8 r e v e r s e p o l a r i t y p o l a r i t y p r o t e c t i o n a u t o m a t i c g a i n c o n t r o l r e v e r s e s c l v d d s g n d x 2 x 3 g n d x 2 x 5 p z n z p c n d p s i n a c o n s i n p c o s p z g n d s v d d s d a x 6 g n d s v d d v d d s s c l x 1 p s n s p d n c p c x 4 x 5 x 6 s d a n s e r r n c x 3 x 4 v c c n z n c o s e r r p s n z v r s c v r e f x 1 p z g n d n c p c 4 7 d n d v r d c r 9 + - d p s i n d p d d p c o s d n c o s c 7 d n z 1 0 0 n f 1 k r 1 c 3 1 0 0 n f d p z + - d n s i n i c - t l 8 5 d 3 + - + - + - d p c r 5 2 . 2 k 1 0 0 n f c 2 d 2 1 f c 4 c 1 1 f r 6 d n c 2 . 2 k c 5 1 0 0 n f 1 0 0 n f c 6 + - t v s - d i o d e - a r r a y v p s d a s c l v n + 5 v 2 4 x x e r r i 2 c i 2 c p s i n p z n z p c o s n c o s n s i n n d p d n c p c v n 4 7 r 9 d n d d p s i n d p d d p c o s d n c o s r 1 1 k d n z c 7 1 0 0 n f d p z 1 0 0 n f c 3 d p c 2 . 2 k r 5 d n s i n d 3 i c - t l 8 5 r 6 2 . 2 k d n c 1 f c 1 c 4 1 f c 2 1 0 0 n f d 2 t v s - d i o d e - a r r a y 1 0 0 n f c 5 c 6 1 0 0 n f
ic-pd 3948 phased array sine encoder rev c1, page 11/ 12 design review: notes on chip functions ic-pd3948. no. function, parameter/code description and application hints 1 none at time of printing (datasheet release b5, 2011). the current datasheet (c1) introduces minor changes to elec. char. which are applicable to ic-pd3948. as well, but not functional relevant to applications. refer to revision history for details. 2 ic top marking change of optobga package marking during 2014: (assembly code) replaced by (product code), (date code) replaced by (assembly code) table 4: notes on chip functions regarding ic-pd3948 chip release 0. ic-pd3948 y, y1 no. function, parameter/code description and application hints 1 hd phased array chip release utilizes a high density phased array layout. 2 transimpedance gain improvement of disturbance immunity by lower gain: for s/c and index channel from 4 m
to 1 m
, for c/d channel from 4 m
to 2 m
. table 5: notes on chip functions regarding ic-pd3948 chip release y and y1. revision history rel rel.date chapter modi?cation page b5 11-03-14 ... rel rel.date chapter modi?cation page c1 14-07-31 features explanation of cpr and size change of transimpedance (for chip release ic-pd3948 y) 2 description description of hd phased array supplemented (for chip release ic-pd3948 y) 2 packaging information pad layout supplemented (for chip release ic-pd3948 y) oqfn and obga package drawings updated for top marking oqfn package drawing updated for tolerances 3...5 thermal data missing operating conditions and extended temperature added 6 electrical characteristics item 101, conditions: reference is pk item 104: wavelength 850 nm supplemented, item 105 excluded item 106: adaption of limits (for chip release ic-pd3948.) items 103, 106, 201, 202, 203, 212: supplements (for chip release ic-pd3948 y) items 302, 401, 501, 503: min. limit items 501, 502: conditions 7, 8 application circuits fig. 1 corrected, description supplemented fig. 2 replaced, description supplemented (ic-msa in place of ic-tw3) 9,10 design review chapter added 10 revision history chapter added 11 ic-haus expressly reserves the right to change its products and/or speci?cations. an info letter gives details as to any amendments and additions made to the relevant current speci?cations on our internet website www.ichaus.de/infoletter ; this letter is generated automatically and shall be sent to registered users by email. copying C even as an excerpt C is only permitted with ic-haus approval in writing and precise reference to source. ic-haus does not warrant the accuracy, completeness or timeliness of the speci?cation and does not assume liability for any errors or omissions in these materials. the data speci?ed is intended solely for the purpose of product description. no representations or warranties, either express or implied, of merchantability, ?tness for a particular purpose or of any other nature are made hereunder with respect to information/speci?cation or the products to which information refers and no guarantee with respect to compliance to the intended use is given. in particular, this also applies to the stated possible applications or areas of applications of the product. ic-haus products are not designed for and must not be used in connection with any applications where the failure of such products would reasonably be expected to result in signi?cant personal injury or death (safety-critical applications) without ic-haus speci?c written consent. safety-critical applications include, without limitation, life support devices and systems. ic-haus products are not designed nor intended for use in military or aerospace applications or environments or in automotive applications unless speci?cally designated for such use by ic-haus. ic-haus conveys no patent, copyright, mask work right or other trade mark right to this product. ic-haus assumes no liability for any patent and/or other trade mark rights of a third party resulting from processing or handling of the product and/or any other use of the product. p r e l i m i n a r y p r e l i m i n a r y
ic-pd 3948 phased array sine encoder rev c1, page 12/ 12 ordering information type package options order designation ic-pd3948 32-pin optoqfn, 5 mm x 5 mm, thickness 0.9 mm rohs compliant ic-pd3948 oqfn32-5x5 15-pin optobga, 6.2 mm x 5.2 mm thickness 1.7 mm rohs compliant ic-pd3948 obga lsh2c evaluation kit pcb (60 mm x 40 mm), assembled with optobga with led and code disc ic-pd3948 eval lsh2m code disc 2048 cpr (s/c) with index, 1 cpr (c/d) absolute, od ? 39 mm, id ? 18.0 mm, optical radius 17.5 mm (glass 1 mm) pd2s 39-2048 for technical support, information about prices and terms of delivery please contact: ic-haus gmbh tel.: +49 (0) 61 35 - 92 92 - 0 am kuemmerling 18 fax: +49 (0) 61 35 - 92 92 - 192 d-55294 bodenheim web: http://www.ichaus.com germany e-mail: sales@ichaus.com appointed local distributors: http://www.ichaus.com/sales_partners p r e l i m i n a r y p r e l i m i n a r y

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