1/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm co., ltd. all rights reserved. dacs for electronic adjustment high-precision 10bit 4ch/6ch d/a converters BU2508FV, bu2507fv description BU2508FV and bu2507fv ics are high performance 10bit r-2r-type dacs with 4ch and 6ch outputs, respectively. each channel incorporates a full swing output-type buffer amplif ier with high speed output response characteristics, resulting in a greatly shortened wait time. the ics also utilize the ttl level input method. features 1) high performance, multi-channels r-2r-type 10bit d/a converter built-in (BU2508FV: 4 channels, bu2507fv: 6 channels) 2) full swing output type buffer amplif ier incorporated at each output channel 3) the reset terminal can keep the voltage of all 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) compact package: 14 pins, 0.65mm pitch (ssop-b14) applications dvds, cd-rs, cd-rws, digital cameras lineup parameter bu2507fv BU2508FV power source voltage range 4.5 to 5.5v 4.5 to 5.5v number of channels 6ch 4ch differential non linearity error 1.0lsb 1.0lsb integral non linearity error 3.5lsb 3.5lsb data transfer frequency 10mhz 10mhz package ssop-b14 ssop-b14 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 st orage temperature range t stg -55 to 125 power dissipation pd 350 * mw * derated at 3.5mw/ 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.11052ect02
BU2508FV,bu2507fv technical note 2/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm 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 = 0ua 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 - 2.0 3.4 ma (*1) d/a converter upper standard voltage setting range vrefh 3.0 - 5 v outputs does not necessarily take a value in standard voltage setting range. value that output may take is in 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 satu r ation 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) 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 resist ance value rup 12.5 25 37.5 k ? input voltage 0v (resistance value changes according to voltage to be impressed.) *1: value in the case where ch1 ~ ch4 are set to maximum current (after reset) 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 - - - da output settling time tldd - 7 20 s clQ 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 output t ckl t cr t ckh t cf t dch t chd t chl t ldh t ldc t ldd reset t rtl
BU2508FV,bu2507fv technical note 3/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm co., ltd. all rights reserved. dac variable output range function with the variable output range function, the upper / lower limits of the output volt age as well as the power supply voltage can be set. the upper limit value setting terminal vrefh is used as the power supply terminal, while the lower limit value setting terminal vrefl is used as the gnd terminal (1lsb P 5mv). in the example below, vrefh = 3. 5v / vrefl = 1.5v. further adjustments can be made in order to achieve greater accuracy (1lsb P 2mv). block diagrams bu2507fv BU2508FV input code 3ffh vout 5v 0v 1024 ?? input code 3ffh vout 5v 0v 1024 ?? 3.5v 1.5v vrefh vrefl 1lsb P 5.0mv 1lsb P 2.0mv step step 14bit ??? ????? ?????? 10bit r-2r d/a ?????? 10bit latch ch1 ??? ch2 10bit latch ????? ??????? 10bit r-2r d/a ?????? d0 1 2 3 4 5 6 d9 d10 11 12 d13 5 l d/a 3 l d/a 7 6 5 4 3 2 1 ao5 ao4 reset ao3 ao2 vss (vrefl) 8 9 10 11 12 13 14 ao6 ld clk di ao1 gnd 7 8 vdd (vrefh) vcc 4 l d/a d/a l 6 14bit ??? ????? ?????? 10bit r-2r d/a ?????? 10bit latch ch1 ??? ch2 10bit latch ????? ??????? 10bit r-2r d/a ?????? d0 1 2 3 4 5 6 d9 d10 11 12 d13 3 l d/a 7 6 5 4 3 2 1 ao3 test2 reset test1 ao2 vss (vrefl) 8 9 10 11 12 13 14 ao4 ld clk di ao1 gnd 7 8 vdd (vrefh) vcc d/a l 4 shift registe r shift register address decoder address decoder da converte r da converte r da converte r buffer operation amplifier buffer operation amplifier da converte r
BU2508FV,bu2507fv technical note 4/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm co., ltd. all rights reserved. terminal description no terminal name analog / digital i/o description of terminal equivalent circuit 1 vss analog - da converter lower stan dard voltage (vrefl) input terminal 6 2 ao2 analog o 10bit d/a output (ch2) 4 3 ao3(test1) analog o 10bit d/a out put (ch3) (BU2508FV : test terminal) 4 4 reset digital i all ch analog output l fixed 2 5 ao4(test2) digital i 10bit d/a out put (ch4) (BU2508FV : test terminal) 4 6 ao5 (ao3) analog o 10bit d/a output ( ch5) (BU2508FV : 10bit d/a output (ch3)) 4 7 vdd analog - da converter upper standard voltage (vrefh) input terminal 5 8 vcc - - power source terminal - 9 ao6 (ao4) analog o 10bit d/a output ( ch6) (BU2508FV : 10bit d/a output (ch4)) 4 10 ld digital i when high level is input to ld terminal, the value of 14bit shift register is loaded to decoder and d/a output register. 1 11 clk digital i shift clock input terminal. at rise of shift clock, the signal from di terminal is input to 14bit shift register. 1 12 di digital i serial data input terminal. serial data whose data length is 14bit (address 4bit + data 10bit) is input. 1 13 ao1 analog o 10bit d/a output (ch1) 4 14 gnd - - gnd terminal - *in the case of BU2508FV, be sure to open test1 and test2 terminals. 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)
BU2508FV,bu2507fv technical note 5/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm co., ltd. all rights reserved. command sending 1) in the case of bu2507fv (1) data format [data : lsb first] (2) data timing diagram d3 d2 d1 d0 address selection 0 0 0 0 inconsequential 0 0 0 1 inconsequential 0 0 1 0 ao1 selection 0 0 1 1 ao2 selection 0 1 0 0 inconsequential 0 1 0 1 ao3 selection 0 1 1 0 ao4 selection 0 1 1 1 inconsequential 1 0 0 0 ao5 selection 1 0 0 1 ao6 selection 1 0 1 0 inconsequential 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 (vrefh=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) in the case of BU2508FV (1) data format [data: lsb first ] (2) data timing diagram d13 d12 d11 d10 d9 d8 d7 d6 d5 d4 d/a output (vrefh=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 d3 d2 d1 d0 address selection 0 0 0 0 don?t care 0 0 0 1 don?t care 0 0 1 0 ao1 selection 0 0 1 1 ao2 selection 0 1 0 0 don?t care 0 1 0 1 don?t care 0 1 1 0 don?t care 0 1 1 1 don?t care 1 0 0 0 ao3 selection 1 0 0 1 ao4 selection 1 0 1 0 don?t care 1 0 1 1 don?t care 1 1 0 0 don?t care 1 1 0 1 don?t care 1 1 1 0 don?t care 1 1 1 1 don?t care d 0 d1 d 2 d 3 d1 3 d 12 d 11 di clk ld dacout d 4 a ddress lsb a ddress msb data msb data lsb d 13 d 12 d 11 d 10 d 9 d 8d 7 d6 d 5 d 4d 3 d2 d1 d0 d/ a converter output setting dat a address select d1 3 d 12 d 11 di clk ld dacout d 0 d1 d 2 d 3 d 4 a ddress lsb a ddress msb data msb data lsb d 13 d 12 d 11 d10 d9 d 8d 7d 6 d 5 d 4d3 d 2d 1d 0 d/ a converter output setting dat a address select
BU2508FV,bu2507fv technical note 6/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm co., ltd. all rights reserved. electrical characteristics curves fig.10 circuit current temperature characteristic fig.2 output voltage linearity (25 ) fig.4 differential linearity error (-30 ) fig.5 differential linearity error (25 ) fig.6 differential linearity error (85 ) fig.7 integral linearity error (-30 ) fig.8 integral linearity error (25 ) fig.9 integral linearity error (85 ) 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] -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal] dnl [lsb] -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal ] dnl [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] -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal] inl [lsb] fig.11 output load fluctuation characteristic (input code : 1ffh) fig.12 pull-up built in resistance characteristic 0 1 2 3 4 5 6 -40 10 60 temp. [ ] icc [ma] code=1ffh code=000h code=3ffh 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] ta= -30 ta= 25 ta= 85 -1.5 -1 -0.5 0 0.5 1 1.5 0 200 400 600 800 1000 1200 input code [decimal ] dnl [lsb] ta= -30 ta= 25 ta= 85
BU2508FV,bu2507fv technical note 7/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm co., ltd. all rights reserved. standard example application circuit notes for use (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 ic 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, ic 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 ic. (4) gnd voltage please keep gnd voltage lowest of any other terminal of this ic. please confirm other terminal voltages is 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 ic direction and displace ment when mounting ic on pcb. if you assemble them by mistake and electrify it, ic might be destroyed. and it is happen to short among ic 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 inserted between the analog output and ground in order to eliminate noise. a capacitance up to 100pf is recommended (including the capacitance of the wire). ao1 ao2 ao3 v refh v refl vcc gnd ao6 di clk ld controller ch1 ch2 ch3 ch6 reset
BU2508FV,bu2507fv technical note 8/8 www.rohm.com 2011.08 - rev.c ? 2011 rohm co., ltd. all rights reserved. ordering part number b u 2 5 0 8 f v - e 2 part no. part no. 2507 2508 package fv: ssop-b14 packaging and forming specification e2: embossed tape and reel ? 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 (unit : mm) ssop-b14 8 7 14 1 0.10 6.4 0.3 4.4 0.2 5.0 0.2 0.22 0.1 1.15 0.1 0.65 0.15 0.1 0.3min. 0.1
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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