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IC-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 1/ 10 features ? compact encoder sensor with differential scanning and sine outputs ? phased-array design for excellent signal matching ? reduced cross talk due to moderate track pitch ? ultra low dark currents for operation to high temperature ? low noise ampli?ers with high transimpedance of typ. 4 m
? short-circuit-proof, low impedance voltage outputs for enhanced emi tolerance ? space saving qfn 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 encoder ? ac 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 ? 2011 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-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 2/ 10 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
, output signal voltages of several hundred mil- livolts are obtained at illumination levels of just 1 to 3 mw/cm 2 . in most cases complicated noise sup- pression 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 ppr (plus an additional index signal) and a low res- olution of 1 ppr (at c/d). all code disc signal tracks are evaluated differentially; 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 by a 740 nm led. a relatively low led current is enough to operate the sensor, proving bene?cial to the life expectancy of the led at high operating temperatures. packages and chip layout information pad layout (2.88 mm x 3.37 mm) pad 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 nd d track - 10 pd d track + 11 nc c track - 12 pc c track + 13 vrdc d/c track reference 14 vrsc s/c track reference 15 gnd ground notes: all outputs are analog voltage outputs. p r e l i m i n a r y p r e l i m i n a r y
IC-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 3/ 10 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 + 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 - 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. 24 gnd ground bp backside pad pin numbers marked n.c. are not in use. the backside paddle is not intended as an electrical connection point; when used as shield a single link to gnd is permissible. p r e l i m i n a r y p r e l i m i n a r y dra_lsh2c-pdxx_pack_2, 8:1 1 2 3 4 a b c d 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-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 4/ 10 package dimensions maximum molding excess +20 m / -200 m versus surface of glass. all dimensions given in mm. 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 top 0.90 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 dra_pdxx-oqfn32-2_pack_1, 10:1
IC-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 5/ 10 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 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 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 5a (max. ?oor live 24 h at 30 c and 60 % rh); please refer to customer information ?le no. 7 for details. *) package quali?cation pending. 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-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 6/ 10 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( )max 400 950 nm 102 pk peak sensitivity wavelength 680 nm 103 aph() radiant sensitive area dpsin, dnsin, dpcos, dncos 0.075 mm 2 dpc, dnc, dpd, dnd 0.033 mm 2 dpz, dnz 0.042 mm 2 104 s( ) spectral sensitivity led = 740 nm 0.5 a/w 105 s( pk)max maximum spectral sensitivity led = pk 0.55 a/w 106 e()mx irradiance for maximum signal level led = 740 nm, vout() not saturated dpsin, dnsin, dpcos, dncos 1.2 2.0 3.2 mw/ cm 2 dpc, dnc, dpd, dnd 3.0 4.5 6.5 mw/ cm 2 dpz, dnz 2.8 4.2 6.0 mw/ cm 2 photocurrent ampli?ers 201 iph() permissible photocurrent operat- ing range 0 280 na 202 ()r photo sensitivity (light-to-voltage conversion ratio) led = 740 nm 0.8 1.2 2.0 v/w 203 z() equivalent transimpedance gain z = vout() / iph() 2.69 4.0 5.46 m
204 tcz temperature coef?cient of tran- simpedance 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 212 fc()hi cut-off frequency (-3 db) 120 180 280 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 600 770 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 600 770 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
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IC-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 7/ 10 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. reference voltages vref 501 vout() reference voltage i(vref) = 0...+1.6 ma 600 770 1000 mv 502 dvout() load balancing i(vref) = 0...+1.6 ma -10 +10 mv 503 isc()hi short-circuit current hi current to ground 200 420 800 a 504 isc()lo short-circuit current lo current to ic 2 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-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 8/ 10 application circuits figure 1: application example motor feedback encoder figure 2: application example motor feedback encoder p r e l i m i n a r y p r e l i m i n a r y ic-msb ic-msb disc IC-PD3948 ic-msb disc IC-PD3948 ic-tw3
IC-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 9/ 10 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 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. as a general rule our developments, ips, principle circuitry and range of integrated circuits are suitable and speci?cally designed for appropriate use in technical applications, such as in devices, systems and any kind of technical equipment, in so far as they do not infringe existing patent rights. in principle the range of use is limitless in a technical sense and refers to the products listed in the inventory of goods compiled for the 2008 and following export trade statistics issued annually by the bureau of statistics in wiesbaden, for example, or to any product in the product catalogue published for the 2007 and following exhibitions in hanover (hannover-messe). we understand suitable application of our published designs to be state-of-the-art technology which can no longer be classed as inventive under the stipulations of patent law. our explicit application notes are to be treated only as mere examples of the many possible and extremely advantageous uses our products can be put to. p r e l i m i n a r y p r e l i m i n a r y
IC-PD3948 5-ch. phased array sine encoder (39-2048) rev b5, page 10/ 10 ordering information type package options order designation IC-PD3948 - IC-PD3948 chip 15-pin optobga, 6.2 mm x 5.2 mm, thickness 1.7 mm IC-PD3948 obga lsh2c 32-pin optoqfn, 5 mm x 5 mm, thickness 0.9 mm IC-PD3948 oqfn32-5x5 suitable code disc 2048 ppr with 1 ppr 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 (61 35) 92 92-0 am kuemmerling 18 fax: +49 (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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