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TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 1 the lumenology company copyright 2007, taos inc. www.taosinc.com converts light intensity to output voltage monolithic silicon ic containing photodiode, operational amplifier, and feedback components high sensitivity single voltage supply operation (2.7 v to 5.5 v) high irradiance responsivity ...t ypical 680 mv/( w/cm 2 ) at p = 640 nm low noise (200 vrms typ to 1 khz) rail-to-rail output high power-supply rejection (35 db at 1 khz) low-profile surface-mount package rohs compliant description the TSL257T is a high-sensitivity low-noise light-to-voltage optical converter that combines a photodiode and a transimpedance amplifier on a single monolithic cmos integrated circuit. output voltage is directly proportional to light intensity (irradiance) on the photodiode. the TSL257T has a transimpedance gain of 320 m . the device has improved offset voltage stability and low power consumption and is supplied in a compact 4-lead surface-mount package. functional block diagram voltage output + ? terminal functions terminal name t pkg no. description gnd 2 power supply ground (substrate). all voltages are referenced to gnd. out 4 output voltage. v dd 3 supply voltage. n/c 1 no connection. texas advanced optoelectronic solutions inc. 1001 klein road suite 300 plano, tx 75074 (972) 673-0759 package t 4-lead smd (top view) n/c 1 gnd 2 4 out 3 v dd ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 2 copyright 2007, taos inc. the lumenology company www.taosinc.com absolute maximum ratings over operating free-air temperature range (unless otherwise noted) ? supply voltage, v dd (see note 1) 6 v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . output current, i o 10 ma . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . duration of short-circuit current at (or below) 25 c 5 s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . operating free-air temperature range, t a ? 25 c to 85 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . storage temperature range, t stg ? 25 c to 85 c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . solder conditions in accordance with jedec ? j ? srd? 020a, maximum temperature 260 c . . . . . . . . . . . . . . ? stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, a nd functional operation of the device at these or any other conditions beyond those indicated under ?recommended operating conditions? is not implied. exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. note 1: all voltages are with respect to gnd. recommended operating conditions min max unit supply voltage, v dd 2.7 5.5 v operating free-air temperature, t a 0 70 c electrical characteristics at v dd = 5 v, t a = 25 c, p = 640 nm, r l = 10 k (unless otherwise noted) (see notes 2, 3, and 4) parameter test conditions min typ max unit v d dark voltage e e = 0 0 15 mv v maximum output voltage swing v dd = 4.5 v, no load 4.49 v v om maximum output voltage swing v dd = 4.5 v, r l = 10 k 4 4.2 v v o output voltage e e = 2.93 w/cm 2 1.5 2 2.5 v vd temperature coefficient of dark voltage (v d ) t a = 0 c to 70 c ? 15 v/ c r e irradiance responsivity see note 5 680 mv/( w/cm 2 ) psrr power supply rejection ratio f ac = 100 hz, see note 6 55 db pp y j f ac = 1 khz, see note 6 35 db i dd supply current e e = 2.93 w/cm 2 2 3.8 ma notes: 2. measured with r l = 10 k between output and ground. 3. optical measurements are made using small-angle incident radiation from a light-emitting diode (led) optical source. 4. the input irradiance e e is supplied by an al i ngap led with peak wavelength p = 640 nm. 5. irradiance responsivity is characterized over the range v o = 0.1 v to 4.5 v. the best-fit straight line of output voltage v o versus irradiance e e over this range will typically have a positive extrapolated v o value for e e = 0. 6. power supply rejection ratio psrr is defined as 20 log ( v dd (f)/ v o (f)) with v dd (f = 0) = 5 v and v o (f = 0) = 2 v. switching characteristics at v dd = 5 v, t a = 25 c, p = 640 nm, r l = 10 k (unless otherwise noted) parameter test conditions min typ max unit t r output pulse rise time, 10% to 90% of final value see note 10 and figure 1 160 250 s t f output pulse fall time, 10% to 90% of final value see note 10 and figure 1 150 250 s t s output settling time to 1% of final value see note 10 and figure 1 330 s integrated noise voltage f = dc to 1 khz e e = 0 200 vrms f = 10 hz e e = 0 6 v n output noise voltage, rms f = 100 hz e e = 0 6 v/ hz rms n pg , f = 1 khz e e = 0 7 / note 7: switching characteristics apply over the range v o = 0.1 v to 4.5 v. ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 3 the lumenology company copyright 2007, taos inc. www.taosinc.com parameter measurement information voltage waveform test circuit input e e 10% 90% output (see note b) t r TSL257T r l v dd 2 1 3 + ? output pulse generator led (see note a) t f 90% 10% notes: a. the input irradiance is supplied by a pulsed al i ngap light-emitting diode with the following characteristics: p = 640 nm, t r < 1 s, t f < 1 s. b. the output waveform is monitored on an oscilloscope with the following characteristics: t r < 100 ns, z i 1 m , c i 20 pf. figure 1. switching times typical characteristics figure 2 photodiode spectral responsivity ? wavelength ? nm 400 500 600 700 800 900 1000 1100 300 0 0.2 0.4 0.6 0.8 1 relative responsivity t a = 25 c figure 3 20 0 80 60 40 10 f ? frequency ? hz 10 10 2 10 6 10 5 10 4 10 3 power supply rejection ratio ? db 30 70 50 power supply rejection ratio vs frequency ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 4 copyright 2007, taos inc. the lumenology company www.taosinc.com typical characteristics figure 4 4 2 1 0 70 0 10 dark voltage vs free-air temperature 10 30 50 ? dark voltage ? mv v d 3 t a ? free-air temperature ? c 60 20 40 9 7 6 5 8 v dd = 5 v figure 5 normalized output voltage vs. angular displacement ? angular displacement ? v o ? output voltage ? normalized 0 0.2 0.4 0.6 0.8 1 ? 90 ? 60 ? 30 0 30 60 90 optical axis figure 6 normalized output voltage vs. angular displacement ? angular displacement ? v o ? output voltage ? normalized 0 0.2 0.4 0.6 0.8 1 ? 90 ? 60 ? 30 0 30 60 90 optical axis ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 5 the lumenology company copyright 2007, taos inc. www.taosinc.com application information pcb pad layout suggested pcb pad layout guidelines for the t package are shown in figure 7. 1.50 2.90 0.90 1.00 notes: a. all linear dimensions are in millimeters. b. this drawing is subject to change without notice. figure 7. suggested t package pcb layout ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 6 copyright 2007, taos inc. the lumenology company www.taosinc.com mechanical data the TSL257T is supplied in a low-profile surface-mount package. this package contains no lead (pb). package t four-lead surface mount device top view side view bottom view a pin 1 1.35 3.10 7 0.35 detail a: typical package terminal 0.80 0.90 0.10 0.40 r 0.20 lead free pb 1.89 1.0 1.50 0.55 3.80 2.60 ??? ??? photodiode (note c) 0.50 0.45 notes: a. all linear dimensions are in millimeters. b. terminal finish is gold. c. the center of the 0.75 mm diameter integrated photodiode active area is typically located 0.1 mm above the center of the package. d. dimension tolerance is 0.15 mm. e. this drawing is subject to change without notice. figure 8. package t ? four-lead surface mount device packaging configuration ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 7 the lumenology company copyright 2007, taos inc. www.taosinc.com mechanical data 0.30 0.050 2.10 4 0.100 2 0.100 8 typ 1.75 0.100 5.50 0.100 aa b b 12 0.100 r 0.20 typ 1.50 1.50 side view top view end view 3.09 max 2.90 0.100 a o r 0.20 typ 1.80 k o 4.29 max 4.10 0.100 b o detail b detail a r 0.20 typ notes: a. all linear dimensions are in millimeters. b. the dimensions on this drawing are for illustrative purposes only. dimensions of an actual carrier may vary slightly. c. symbols on drawing a o , b o , and k o are defined in ansi eia standard 481 ? b 2001. d. each reel is 178 millimeters in diameter and contains 1000 parts. e. taos packaging tape and reel conform to the requirements of eia standard 481 ? b. f. in accordance with eia standard, device pin 1 is located next to the sprocket holes in the tape. g. this drawing is subject to change without notice. figure 9. four lead surface mount package carrier tape ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 8 copyright 2007, taos inc. the lumenology company www.taosinc.com manufacturing information the reflow profile specified here describes expected maximum heat exposure of devices during the solder reflow process of the device on a pwb. temperature is measured at the top of the device. devices should be limited to one pass through the solder reflow profile. table 1. TSL257T solder reflow profile parameter reference TSL257T average temperature gradient in preheating 2.5 c/sec soak time t soak 2 to 3 minutes time above t 1 , 217 c t 1 max 60 sec time above t 2 , 230 c t 2 max 50 sec time above t 3 , (t peak ? 10 c) t 3 max 10 sec peak temperature in reflow t peak 260 c (? 0 c/+5 c) temperature gradient in cooling max ?5 c/sec t 3 t 2 t 1 t soak t 3 t 2 t 1 t peak not to scale ? for reference only time (sec) temperature ( c) figure 10. TSL257T solder reflow profile ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 9 the lumenology company copyright 2007, taos inc. www.taosinc.com manufacturing information moisture sensitivity optical characteristics of the device can be adversely affected during the soldering process by the release and vaporization of moisture that has been previously absorbed into the package molding compound. to ensure the package molding compound contains the smallest amount of absorbed moisture possible, each device is dry? baked prior to being packed for shipping. devices are packed in a sealed aluminized envelope with silica gel to protect them from ambient moisture during shipping, handling, and storage before use. this package has been assigned a moisture sensitivity level of msl 3 and the devices should be stored under the following conditions: temperature range 5 c to 50 c relative humidity 60% maximum total time 6 months from the date code on the aluminized envelope ? if unopened opened time 168 hours or fewer rebaking will be required if the devices have been stored unopened for more than 6 months or if the aluminized envelope has been open for more than 168 hours. if rebaking is required, it should be done at 90 c for 4 hours. ams ag technical content still valid
TSL257T high-sensitivity light-to-voltage converter taos065b ? april 2007 10 copyright 2007, taos inc. the lumenology company www.taosinc.com production data ? information in this document is current at publication date. products conform to specifications in accordance with the terms of texas advanced optoelectronic solutions, inc. standard warranty. production processing does not necessarily include testing of all parameters. lead-free (pb-free) and green statement pb-free (rohs) taos? terms lead-free or pb-free mean semiconductor products that are compatible with the current rohs requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. where designed to be soldered at high temperatures, taos pb-free products are suitable for use in specified lead-free processes. green (rohs & no sb/br) taos defines green to mean pb-free (rohs compatible), and free of bromine (br) and antimony (sb) based flame retardants (br or sb do not exceed 0.1% by weight in homogeneous material). important information and disclaimer the information provided in this statement represents taos? knowledge and belief as of the date that it is provided. taos bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. efforts are underway to better integrate information from third parties. taos has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. taos and taos suppliers consider certain information to be proprietary, and thus cas numbers and other limited information may not be available for release. notice texas advanced optoelectronic solutions, inc. (t aos) reserves the right to make changes to the products contained in this document to improve performance or for any other purpose, or to discontinue them without notice. customers are advised to contact taos to obtain the latest product information before placing orders or designing taos products into systems. taos assumes no responsibility for the use of any products or circuits described in this document or customer product design, conveys no license, either expressed or implied, under any patent or other right, and makes no representation that the circuits are free of patent infringement. taos further makes no claim as to the suitability of its products for any particu lar purpose, nor does taos assume any liability arising out of the use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. texas advanced optoelectronic solutions, inc. products are not designed or intended for use in critical applications in which the failure or malfunction of the taos product may result in personal injury or death. use of taos products in life support systems is expressly unauthorized and any such use by a customer is completely at the customer?s risk. lumenology, taos, the taos logo, and texas advanced optoelectronic solutions are registered trademarks of texas advanced optoelectronic solutions incorporated. ams ag technical content still valid

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