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1/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. dacs for electronic adjustment high-precision 10bit 8ch/10ch d/a converters bu2506fv,BU2505FV description bu2506fv and BU2505FV ics are high performance 10bit r-2r type dacs with 8ch and 10ch outputs, respectively. cascade connection is possible, ensuring suitability with multi-ch annel applications. each channel incorporates a full swing output-type buffer amplifier with high speed output response char acteristics, resulting in a greatly shortened wait time. the ics also utilize the ttl level input method, and with the reset pin the output voltage can be kept in the lower reference voltage range. features 1) high performance, multi-channel r- 2r-type 10bit d/a converter built-in (bu2506fv: 8 channels, BU2505FV: 10 channels) 2) full swing output type buffer amplifie r incorporated at each output channel 3) the reset terminal can keep the output voltage at al l channels within the lower reference voltage range 4) digital input compatible with ttl levels 5) 14bit 3-line serial data + reset signal input (address 4bit + data 10bit) 6) cascade connection available 7) lsb first / msb first of 10bit data can be changed by the reverse terminal 8) compact package: 0.65mm pitch, 20 pins (ssop-b20) applications dvds, cd-rs, cd-rws, digital cameras lineup parameter BU2505FV bu2506fv power source voltage range 4.5 to 5.5v 4.5 to 5.5v number of channels 10ch 8ch differential non linearity error 1.0lsb 1.0lsb integral non linearity error 3.5lsb 3.5lsb data transfer frequency 10mhz 10mhz package ssop-b20 ssop-b20 absolute maxi mum ratings (ta=25 ) parameter symbol ratings unit power source voltage vcc -0.3 to 6.0 v d/a converter upper standard voltage vdd -0.3 to 6.0 v input voltage vin -0.3 to 6.0 v output voltage vout -0.3 to 6.0 v storage temperature range t stg -55 to 125 power dissipation pd 400 * mw * derated at 4mw/ at ta>25 , mounted on a 70x70x1.6mm fr4 glass epoxy board (copper foil area less than 3%) note: these products are not robust against radiation recommended operating conditions (ta=25 ) parameter symbol limits unit power supply voltage range vcc 4.5 to 5.5 v operating temperature range topr -30 to 85 no.11052ebt03
bu2506fv,BU2505FV technical note 2/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. electrical characteristics (unless otherwise specified, vcc=5v, vrefh=5v, vrefl=0v, ta=25 ) parameter symbol limits unit conditions min. typ. max. power source current icc - 0.85 2.8 ma at clk=10mhz, iao=0 a input leak current iilk -5 - 5 a vin=0 to vcc input voltage l vil - - 0.8 v - input voltage h vih 2.0 - - v - output voltage l vol 0 - 0.4 v iol=2.5ma output voltage h voh 4.6 - 5 v ioh=-2.5ma consumption current irefh - 4.5 7.5 ma data condition : at maximum current - 3.7 6.2 ma (*1) d/a converter upper standard voltage setting range vrefh 3.0 - 5 v outputs are not necessarily within the standard voltage setting range, but are within the buffer amplifier output voltage range (vo). d/a converter lower standard voltage setting range vrefl 0 - 1.5 v buffer amplifier output voltage range vo 0.1 - 4.9 v io=100 a 0.2 - 4.75 io=1.0ma buffer amplifier output drive range io -2 - 2 ma upper side saturation voltage =0.35v (on full scale setting, current sourcing) lower side saturation voltage =0.23v (on zero scale setting, current sinking) precision differential non-linearity error dnl -1.0 - 1.0 lsb vrefh =4.796v vrefl=0.7v vcc=5.5v (4mv/lsb) at no load (io=+0ma ) integral non-linearity error inl -3.5 - 3.5 zero point error szero -25 - 25 mv full scale error sfull -25 - 25 buffer amplifier output impedance ro - 5 15 ? - pull-up i/o internal resistan ce value rup 12.5 25 37.5 k ? input voltage 0v (resistance value changes according to voltage supplied) *1 value in the case where ch1 ~ ch8 are set to maximum current after reset
bu2506fv,BU2505FV technical note 3/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. timing characteristics (unless otherwise specified, vcc=5v, vrefh=5v, vrefl=0v, ta=25 ) parameter symbol limits unit conditions min. typ. max. judgment level is 80% / 20% of vcc. reset l pulse width trtl 50 - - ns - clock l pulse width tckl 50 - - - clock h pulse width tckh 50 - - - clock rise time tcr - - 50 - clock fall time tcf - - 50 - data setup time tdch 20 - - - data hold time tchd 40 - - - load setup time tchl 50 - - - load hold time tldc 50 - - - load h pulse width tldh 50 - - - data output delay time tdo - - 90 cl=100pf da output settling time tldd - 7 20 s cl Q 100pf, vo: 0.5v ? 4.5v. until output value deference from final value becomes 1/2lsb. (note) ld signal is level triggered. when ld input is on h leve l, internal shift-register state is loaded to dac control latch. clock transition during ld=h is inhibited. clk di ld da output tckl tcr tckh tcf tdch tchd tchl tldh tldc tldd do output tdo reset trtl
bu2506fv,BU2505FV technical note 4/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. cascade connection a data output terminal for cascade connection (do) is availabl e for reducing the number of parts when it is increased. the do terminal can be connected to a data input terminal (di) of the next ic. however, do transition is synchronized with rising edge of clo ck signal, do signal should be delayed, to keep a limit of data h old time. for example rc passive filter can be used. also in some cases, an operation frequency of logic signal hav e to be decreased to ensure a margin of data setup time. therefore, it is better to control ld port of each lsi separately, if extra cpu ports are available. in this case, more ports to control ld signals are needed, but a consideration described above doesn?t have do be done. bu 2505fv bu 2506fv ( #2) bu 2505fv bu 2506fv ( #1) ld clk di ld clk di ld 1 ld 2 di clk bu2505 fv bu2506 fv do ld clk di (#2) bu2505 fv bu2506 fv do ld clk di (#1) cpu ld clk di
bu2506fv,BU2505FV technical note 5/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. BU2505FV bu2506fv terminal descriptions no. terminal name analog / digital i/o description equivalent circuit 1 vss analog - da converter lower standard voltage (vrefl) input terminal 6 2 ao3 analog o 10bit d/a output(ch3) 4 3 ao4 analog o 10bit d/a output(ch4) 4 4 ao5 analog o 10bit d/a output(ch5) 4 5 reverse digital i the reverse lsb and msb of data designation 10bit in 14bit. 2 6 reset digital i all ch analog output l fixed 2 7 ao6 analog o 10bit d/a output(ch6) 4 8 ao7 analog o 10bit d/a output(ch7) 4 9 ao8 analog o 10bit d/a output(ch8) 4 10 vdd analog - da converter upper standard voltage (vrefh) input terminal 5 11 vcc - - power source terminal - 12 ao9(test1) analog o 10bit d/a output(ch9) (bu2506fv : test terminal) 4 13 ao10(test2) analog o 10bit d/a output(ch10) (bu2506fv : test terminal) 4 14 do digital o this outputs bit data of lsb of 14bit shift register. 3 15 ld digital i ld terminal. when high level is input, the value of 14bit shift register is loaded to decoder and d/a output register. 1 16 clk digital i shift clock input terminal. at rise of shift clock, the signal from di terminal is input to 14bit shift register. 1 17 di digital i serial data input terminal. serial data whose data length is 14bit (address 4bit + data 10bit) is input. 1 18 ao1 analog o 10bit d/a output(ch1) 4 19 ao2 analog o 10bit d/a output(ch2) 4 20 gnd - - gnd terminal - *in the case of bu2506fv, be sure to leave the test1 and test2 terminals open d/a 14bit shift register l 1 10bit r-2r da converter 10bit latch ch2 ??? ??? ch3 10bit latch buffer operation amplifier 10bit r-2r da converter address decoder d0 1 2 3 4 5 6 d9 d10 11 12 d13 10 d/a l 7 l d/a 6 l d/a 5 l d/a 4 d/a 10 9 8 7 6 5 4 3 2 1 vdd ao8 ao7 ao6 reset reverse ao5 ao4 ao3 vss (vrefh) (vrefl) 11 12 13 14 15 16 17 18 19 20 vcc ao9 ao10 do ld clk di ao1 ao2 gnd 7 8 d/a l 9 8 l d/a l 14bit shift register 1 10bit r-2r da converter 10bit latch ch2 ??? ??? ch3 10bit latch buffer operation amplifier 10bit r-2r da converter address decoder d0 1 2 3 4 5 6 d9 d10 11 12 d13 d/a l 7 l d/a 6 l d/a 5 l d/a 4 d/a 10 9 8 7 6 5 4 3 2 1 vdd ao8 ao7 ao6 reset reverse ao5 ao4 ao3 vss (vrefh) (vrefl) 11 12 13 14 15 16 17 18 19 20 vcc test1 test2 do ld clk di ao1 ao2 gnd 7 8 8 l d/a l
bu2506fv,BU2505FV technical note 6/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. d 0d 1d 2d 3 d 13 d 12 d 11 di clk ld dacout d 4 a ddress lsb a ddress msb data msb data lsb command transmission 1) reverse = open (or vcc short-circuit) setting (1) data format (2) data timing diagram d3 d2 d1 d0 address selection 0 0 0 0 inconsequential 0 0 0 1 ao1 selection 0 0 1 0 ao2 selection 0 0 1 1 ao3 selection 0 1 0 0 ao4 selection 0 1 0 1 ao5 selection 0 1 1 0 ao6 selection 0 1 1 1 ao7 selection 1 0 0 0 ao8 selection 1 0 0 1 ao9 selection *1 1 0 1 0 ao10 selection *1 1 0 1 1 inconsequential 1 1 0 0 inconsequential 1 1 0 1 inconsequential 1 1 1 0 inconsequential 1 1 1 1 inconsequential d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d/a output (vre fh=vdd, vrefl=vss) 0 0 0 0 0 0 0 0 0 0 vrefl 0 0 0 0 0 0 0 0 0 1 (vrefh-vrefl)/10241+vrefl 0 0 0 0 0 0 0 0 1 0 (vrefh-vrefl)/10242+vrefl 0 0 0 0 0 0 0 0 1 1 (vrefh-vrefl)/10243+vrefl : : : : : : : : : : : 1 1 1 1 1 1 1 1 1 0 (vrefh-vrefl)/10241022+vrefl 1 1 1 1 1 1 1 1 1 1 (vrefh-vrefl)/10241023+vrefl 2) reverse = l setting (1) data format (2) data timing diagram d3 d2 d1 d0 address selection 0 0 0 0 inconsequential 0 0 0 1 ao1 selection 0 0 1 0 ao2 selection 0 0 1 1 ao3 selection 0 1 0 0 ao4 selection 0 1 0 1 ao5 selection 0 1 1 0 ao6 selection 0 1 1 1 ao7 selection 1 0 0 0 ao8 selection 1 0 0 1 ao9 selection *1 1 0 1 0 ao10 selection *1 1 0 1 1 inconsequential 1 1 0 0 inconsequential 1 1 0 1 inconsequential 1 1 1 0 inconsequential 1 1 1 1 inconsequential d4 d5 d6 d7 d8 d9 d10 d11 d12 d13 d/a output (vrefh=vdd, vrefl=vss) 0 0 0 0 0 0 0 0 0 0 vrefl 1 0 0 0 0 0 0 0 0 0 (vrefh-vrefl)/10241+vrefl 0 1 0 0 0 0 0 0 0 0 (vrefh-vrefl)/10242+vrefl 1 1 0 0 0 0 0 0 0 0 (vrefh-vrefl)/10243+vrefl : : : : : : : : : : : 0 1 1 1 1 1 1 1 1 1 (vrefh-vrefl)/10241022+vrefl 1 1 1 1 1 1 1 1 1 1 (vrefh-vrefl)/10241023+vrefl *1 in the bu2506fv, this channel is for testing, therefore, do not designate. for d/a converter output setting for address selection for d/a converter output setting for address selection d 0d1d 2d 3 d4 d5d 6 di clk ld dacout d13 data msb data lsb a ddress lsb a ddress msb
bu2506fv,BU2505FV technical note 7/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. electrical characteristics curves fig.2 output voltage linearity (25 ) fig.1 output voltage linearity (-30 ) 0 1 2 3 4 5 6 0 200 400 600 800 1000 1200 input code [decimal] vout [v] 0 1 2 3 4 5 6 0 200 400 600 800 1000 1200 input code [decimal] vout [v] 0 1 2 3 4 5 6 0 200 400 600 800 1000 1200 input code [decimal] vout [v] fig.3 output voltage linearity (85 ) -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal] dnl [lsb] fig.4 differential linearity error (-30 ) fig.5 differential linearity error (25 ) fig.6 differential linearity error (85 ) 10 15 20 25 30 35 40 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.8 6 vin [v] rup [k ? ] -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal ] dnl [lsb] fig.7 integral linearity error (-30 ) fig.8 integral linearity error (25 ) fig.9 integral linearity error (85 ) -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal] inl [lsb] -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal] inl [lsb] -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal] inl [lsb] fig.10 circuit current temperature characteristic fig.11 output load fluctuation characteristic (input code: 1ffh) 2.48 2.49 2.5 2.51 2.52 -2.5 -1.5 -0.5 0.5 1.5 2.5 iout [ma] vout [v] fig.12 pull-up built in resistance characteristic ta= -30 ta= 25 ta= 85 10 15 20 25 30 35 40 4 4.2 4.4 4.6 4.8 5 5.2 5.4 5.6 5.8 6 vin [v] rup [k ? ] ta= -30 ta= 25 ta= 85 code=1ffh code=000h code=3ffh 0 1 2 3 4 5 6 -40 10 60 ] te m p . [ icc [ma]
bu2506fv,BU2505FV technical note 8/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. equivalent circuits 1 to inside 2 to inside *1 3 from inside 4 ? 5 ? 6 4 5 6 *1 25k ? at vcc = 5.0v (changes according to voltage supplied) standard example application circuit ao1 ao2 ao3 v refh v refl vcc gnd ao10 di clk ld controller ch1 ch2 ch3 ch10 reverse reset
bu2506fv,BU2505FV technical note 9/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. operation notes (1) the electrical characteristic and data on graphs for this datasheet, are typically evaluated value, and not guaranteed. (2) we suppose that application circuits ar e recommendable, but please make sufficient check for characteristics with the actual application. in case that value of external component for this lsi is changed, please check characteristic, not only static but also transient. (3) about absolute maximum ratings if operation condition is over the absolute maximum ratings, s upply voltage or other operation range, lsi will be broken. please don't apply any voltage or temperature over the abso lute maximum ratings. if application have possibilities of become over the absolute maximum ratings, please take safety measures by using fuse and so on. not to over absolute maximum ratings of lsi. (4) gnd voltage please keep gnd voltage lowest of any other terminal of this lsi. please confirm that ot her terminal voltages are not lower than gnd. (5) thermal design please making a thermal design that allows for a sufficient margin in light of the power dissipation in actual operating condition. (6) about terminals short and wrong mounting please pay full attention to the lsi direction and displace ment when mounting lsi on pcb. if you assemble them by mistake and electrify it, lsi might be destroyed. and it is happen to short among lsi terminals or terminals and power supply, by foreign substance. (7) about operation in st rong electromagnetic field if you use it in strong electromagnetic field, please evaluate fully as there is a possibility of malfunction. (8) place a bypass capacitor as close as possible between each power supply terminal and ground in order to prevent deterioration of the d/a conversion accuracy due to ripple and noise signals from power supply or gnd. (9) a capacitor should be placed between the analog output and ground in order to eliminate noise. a capacitance up to 100pf is recommended (including the capacitance of the wire). (10) this ic is selectable to decode the 10bit di data patte rn using either lsb first or msb first, depending on the conditions of the reverse terminal. therefore the reverse terminal s hould be open or vdd voltage (lsb first) or gnd voltage (msb first)
bu2506fv,BU2505FV technical note 10/10 www.rohm.com 2011.04 - rev.b ? 2011rohm co., ltd. all rights reserved. ordering part number b u 2 5 0 6 f v - e 2 part no. part no. 2506 2505 package fv: ssop-b20 packaging and forming specification e2: embossed tape and reel (unit : mm) ssop-b20 0.1 11 10 20 1 0.1 0.1 6.4 0.3 4.4 0.2 6.5 0.2 0.15 0.1 0.22 0.1 0.65 1.15 0.1 0.3min. ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 2500pcs e2 () direction of feed reel 1pin
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specied in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel- controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specied herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law.

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