BU2500FV / bu2501fv optical disc ics 1/10 8bit 12-channel d/a converter BU2500FV / bu2501fv BU2500FV / bu2501fv is a 12ch high-performance 8bit d/a converter which adopts the r-2r system. the BU2500FV utilizes a 5v supply voltage and the bu2501fv a 3v. each channel output incorporates a rail to rail output type buffer amplifier. three wire serial data input and cascade connection is possible. small package (0.65mm pitch and 20pin) is adopted. ! applications cd-r, cd-rw, dvc, digital camera and industrial equipment ! features 1) high-performance 8bit 12-channel d/a converter adopting the r-2r system. 2) output of each channel incorporates a rail to rail output type buffer amplifier. 3) digital input compatible with ttl levels. 4) 12bit 3wire serial data input, cascade connection is possible. 5) buffer amplifier of each channel is highly-stable. prevents oscillation even with capacitance loads. ! absolute maximum ratings (ta=25 c) supply voltage output voltage power dissipation upper reference voltage of d/a converter input voltage ? reduced by 4mw for each increase in ta of 1 c over 25 c. parameter symbol limits unit v cc v dd pd tstg topr v v v v mw c c operating temperature storage temperature ? 0.3~ + 6.0 ? 0.3~ + 6.0 ? 0.3~ + 6.0 ? 0.3~ + 6.0 ? 55~ + 125 ? 25~ + 85 v in v out 400 ? ! recommended operating conditions (ta=25 c) supply voltage (BU2500FV) parameter symbol limits unit v cc v 4.5~5.5 supply voltage (bu2501fv) v cc v 2.7~3.6
BU2500FV / bu2501fv optical disc ics 2/10 ! ! ! ! block diagram 12345678910 20 19 18 17 16 15 14 13 12 11 ch3 ch2 8bit latch 8bit r-2r d/a converter buffer operational amplifier 4 l d / a 1 l d / a 12 l d / a address decoder 11 l d / a 5 l d / a 6 l d / a 7 l d / a 8 l d / a 9 l d / a 10 l d / a 8bit latch 8bit r-2r d/a converter vss (vrefl) ao3 ao4 ao5 ao6 ao7 ao8 ao9 ao10 v dd (vrefh) gnd ao2 ao1 di clk ld do ao12 ao11 vcc 12bit shift register d0 d8 1 2 3 4 5 6 7 9 10 11
BU2500FV / bu2501fv optical disc ics 3/10 ! ! ! ! pin descriptions pin no. pin name i / o analog / digital function circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 5 3 3 3 3 3 3 3 3 4 ? 3 3 2 1 1 1 3 3 ? vss ao3 ao4 ao5 ao6 ao7 ao8 ao9 ao10 v dd vcc ao11 ao12 do ld clk di ao1 ao2 gnd analog analog analog analog analog analog analog analog analog analog ? analog analog digital digital digital digital analog analog ? ? o o o o o o o o ? ? o o o i i i o o ? 8bit d/a converter output terminal (ch3) 8bit d/a converter output terminal (ch4) 8bit d/a converter output terminal (ch5) 8bit d/a converter output terminal (ch6) 8bit d/a converter output terminal (ch7) 8bit d/a converter output terminal (ch8) 8bit d/a converter output terminal (ch9) 8bit d/a converter output terminal (ch10) d/a converter upper reference voltage input terminal d/a converter lower reference voltage input terminal power supply terminal 8bit d/a converter output terminal (ch11) 8bit d/a converter output terminal (ch12) terminal to output msb data of 12-bit shift register when h-level signal is input to this terminal, the value stored in 12-bit shift register is loaded in decoder and d/a converter output register. shift clock input terminal. input signal at di pin is input to 12-bit shift register at rise of shift clock pulse serial data input terminal to input 12-bit long serial data 8bit d/a converter output terminal (ch1) 8bit d/a converter output terminal (ch2) gnd terminal ! ! ! ! input / output terminal equivalent circuits 1 3 4 5 2 1 4 3 5 to inside 2 from inside
BU2500FV / bu2501fv optical disc ics 4/10 ! electrical characteristics ? digital characteristics BU2500FV (unless otherwise noted, v cc =5v, vref h =5v, vref l =0v, ta=25 c) parameter conditions clk=1mhz operation, v cc =5v, i ao =0 a v in =0 v cc i ol =2.5ma i oh = ? 2.5ma symbol i cc i ilk v il v ih v ol v oh ? ? 5 2.0 0 4.6 ? ? ? ? ? ?? 0.5 1.5 0.8 0.4 5 5 min. typ. max. unit ma a v v v v output voltage "h" power supply current input leak current input voltage "l" input voltage "h" output voltage "l" bu2501fv (unless otherwise noted, v cc =3v, vref h =3v, vref l =0v, ta=25 c) parameter conditions clk=1mhz operation, v cc =3v, i ao =0 a v in =0 v cc i ol =2.5ma i oh = ? 2.5ma symbol i cc i ilk v il v ih v ol v oh ? ? 5 1.2 0 2.6 ? ? ? ? ? ?? 0.4 1.2 0.48 0.4 5 3 min. typ. max. unit ma a v v v v output voltage "h" power supply current input leak current input voltage "l" input voltage "h" output voltage "l"
BU2500FV / bu2501fv optical disc ics 5/10 ? analog characteristics BU2500FV (unless otherwise noted, v cc =5v, vref h =5v, vref l =0v, ta=25 c) parameter conditions consumption current buffer amplifier output voltage range buffer amplifier output drive range d/a converter upper reference voltage d/a converter lower reference voltage differential non-linearity error non-linearity error accuracy output capacitative load pull-up i/o-cell internal r value zero code error full scale error symbol iref h vref h vref l v ao i ao s dl s l s zero s full c o r o ? 3.0 0 0.1 0.2 ? 1 ? 1.0 ? 1.5 ? 2 ? 2 ? ? 0.9 ? ? ? ? ? ? ? ? ? ? 5 1.8 5 1.5 4.9 4.8 1 1.0 1.5 2 2 10 15 ma v v v lsb ma f ? vref h =5v, vref l =0v data condition : maximum current reference voltage can not always be set to any value in this range, because it is restricted to the buffer amplifier output voltage range. upper saturation voltage =0.3v lower saturation voltage =0.2v i ao = 100 a i ao = + 500 a vref h =4.79v, vref l =0.95v v cc =5.5v (15mv / lsb) without load (i ao = + 0) min. typ. max. unit this product is not designed for protection against radioactive rays. bu2501fv (unless otherwise noted, v cc =3v, vref h =3v, vref l =0v, ta=25 c) parameter conditions differential non-linearity error non-linearity error accuracy output capacitative load pull-up i/o-cell internal r value zero code error full scale error symbol iref h vref h vref l v ao i ao s dl s l s zero s full c o r o ? 2.1 0 0.1 0.2 ? 0.3 ? 1.0 ? 1.5 ? 2 ? 2 ? ? 0.6 ? ? ? ? ? ? ? ? ? ? 5 1.2 3 0.9 2.9 2.8 1 1.0 1.5 2 2 10 15 ma v v v lsb ma f ? vref h =3v, vref l =0v data condition : maximum current reference voltage can not always be set to any value in this range, because it is restricted to the buffer amplifier output voltage range. upper saturation voltage =0.4v lower saturation voltage =0.4v i ao = 100 a i ao = + 500 a, ? 200 a vref h =2.61v, vref l =0.05v v cc =2.76v (10mv / lsb) without load (i ao = + 0) min. typ. max. unit consumption current buffer amplifier output voltage range buffer amplifier output drive range d/a converter upper reference voltage d/a converter lower reference voltage this product is not designed for protection against radioactive rays.
BU2500FV / bu2501fv optical disc ics 6/10 ? ac characteristics BU2500FV (unless otherwise noted, v cc =5v, vref h =5v, vref l =0v, ta=25 c) parameter conditions cl 1000pf v ao : 0.5v ? 4.5v the time until the becomes the final value of 1/2 lsb. cl=100pf tcr tcf symbol t ckl t ckh t dch t chd t chl t ldc t ldh t do t ldd ?? ? 150 150 20 40 150 100 70 70 80 ?? ?? ? ? ? ? ? ?? ? ? ? ? 150 350 250 min. typ. max. unit s ns ld hold time clock "l" pulse width clock rise time clock fall time clock "h" pulse width ld "h" pulse duration data set up time data hold time data output delay time d/a output setting time ld set up time bu2501fv (unless otherwise noted, v cc =3v, vref h =3v, vref l =0v, ta=25 c) parameter conditions cl 1000pf v ao : 0.1v ? 2.6v the time until the becomes the final value of 1/2 lsb. cl=100pf tcr tcf symbol t ckl t ckh t dch t chd t chl t ldc t ldh t do t ldd ?? ? 150 150 20 40 150 100 70 70 70 ?? ?? ? ? ? ? ? ?? ? ? ? ? 150 350 250 min. typ. max. unit s ns ld hold time clock "l" pulse width clock rise time clock fall time clock "h" pulse width ld "h" pulse duration data set up time data hold time data output delay time d/a output setting time ld set up time
BU2500FV / bu2501fv optical disc ics 7/10 ! ! ! ! circuit operations ? data format d/a output dac data dac selection dac select data don't care don't care don't care don't care ao1 selection ao2 selection ao3 selection ao4 selection ao5 selection ao6 selection ao7 selection ao8 selection ao9 selection ao10 selection ao11 selection ao12 selection (vrefh-vrefl) / 256 1 + vrefl (vrefh-vrefl) / 256 2 + vrefl (vrefh-vrefl) / 256 3 + vrefl (vrefh-vrefl) / 256 4 + vrefl (vrefh-vrefl) / 256 255 + vrefl vrefh ? vrefh=v dd vrefl=v ss 0 1 0 1 0 1 d0 0 0 1 1 1 1 d1 d0 last lsb first msb d1 d2 d3 d4 d5 d6 d7 d8 d9 d10 d11 0 0 0 0 1 1 d2 0 0 0 0 1 1 d3 0 0 0 0 1 1 d4 0 0 0 0 1 1 d5 0 0 0 0 1 1 d6 0 0 0 0 1 1 d7 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 d8 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 d9 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 d10 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 0 d11
BU2500FV / bu2501fv optical disc ics 8/10 ? data timing di clk ld da output d11 msb lsb d10 d9 d8 d2 d1 d0 fig.1 clk di ld da output do output t dch t chd t ckl t ckh tcr tcf fig.2 t ldh t chl t ldd t do t ldc
BU2500FV / bu2501fv optical disc ics 9/10 ! ! ! ! application circuit vref h vcc gnd vref l controller ld clk di ao1 ch1 ao2 ch2 ao3 ch3 ao12 ch12 fig.3 ! ! ! ! operation notes ? there are 3 different type of power supply terminal and 1 type of gnd terminal in this ic. each of these terminals requires the constant power supply for operating. ? pile up ripple and noise to these power supply terminals, it can?t keep the accuracy of the d/a converter. therefore external bypass capacitor recommend to set as close as possible to the terminals between vdd and gnd in order to stabilizes the d/a converter. ? the capacitor between output and gnd recommend to set under 100pf including parasitic capacitor in order to reduces jitter from layout of the output line and noise.
BU2500FV / bu2501fv optical disc ics 10/10 ! ! ! ! external dimensions (units : mm) ssop-b20 BU2500FV / bu2501fv 11 10 20 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. 0.1
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