BU2507FV optical disc ics 1/8 10bit 6-channel d/a converter BU2507FV BU2507FV is an ic that incorporates 10bit 6-channel d/a converter using the r-2r system. each channel output incorporates a rail to rail type output with buffer amplifier. this ic utilizes the ttl level input method. reset pin can keep the output voltage in the lower reference voltage range. ! applications dvd, cd-r, cd-rw, dvc, digital camera, and other industrial equipments. ! features 1) high-performance 10bit 6-channel d/a converter adopting the r-2r system. 2) power supply voltage : 4.5~5.5v. 3) each channel output incorporates a rail to rail type output with buffer amplifier. 4) reset pin can keep output voltage of all channels within the lower reference voltage range. 5) digital input compatible with ttl levels. 6) 10mhz input frequency. 7) 14bit 3wire serial data + reset signal input. (4bit address + 10bit data) ! ! ! ! absolute maximum ratings (ta=25 c) supply voltage output voltage power dissipation upper reference voltage of d/a converter input voltage ? operating at higher than ta = 25 c, 3.5mw shall be redused per 1 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 350 ? ! recommended operating conditions (ta=25 c) power supply voltage parameter symbol limits unit v cc v 4.5~5.5
BU2507FV optical disc ics 2/8 ! ! ! ! block diagram 1234567 14 13 12 11 10 9 8 ch2 10bit latch ch1 10bit latch 10bit r-2r d/a converter 10bit r-2r d/a converter adress decoder buffer operational amplifier 6 l d / a 3 l d / a 4 5 l d / a l d / a vss (vref l ) a o 2a o 3 reset a o 4a o 5v dd (vref h ) gnd a o 1 di clk ld a o 6 vcc 14bit shift register d0 d10 123456789 111213
BU2507FV optical disc ics 3/8 ! ! ! ! pin descriptions pin no. pin name i / o analog / digital function equivalent circuit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 6 4 4 2 4 4 5 ? 4 1 1 1 4 ? vss ao2 ao3 reset ao4 ao5 v dd vcc ld clk di ao1 gnd analog analog analog digital digital analog analog ? digital digital digital analog ? ? o o i o o ? ? i i i o ? 10bit d/a converter output terminal (ch2) 10bit d/a converter output terminal (ch3) the analog output of all channels is fixed for "l" 10bit d/a converter output terminal (ch4) 10bit d/a converter output terminal (ch5) d/a converter upper reference voltage (vref h ) input terminal d/a converter lower reference voltage (vref l ) input terminal power supply terminal ao6 analog o 10bit d/a converter output terminal (ch6) when h-level signal is input to this terminal, the value stored in 14-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 14-bit shift register at rise of shift clock pulse serial data input terminal to input 14-bit (address 4 bit + deta 10bit) long serial data 10bit d/a converter output terminal (ch1) gnd terminal ! ! ! ! input / output terminal equivalent circuit 1 3 4 5 6 2 to inside from inside 4 5 6 to inside ? 1 ? 1 at the time of v cc = 5.0v, 25k ?. (it alters by the applied voltage.)
BU2507FV optical disc ics 4/8 ! electrical characteristics ? digital characteristics (unless otherwise noted, v cc =5v, vref h =5v, vref l =0v, ta=25 c) parameter conditions output high voltage power supply current clk=10mhz operation, v cc =5v, i ao =0 a v in =0 v cc i ol =2.5ma i oh = ? 2.5ma input leak current input low voltage input high voltage output low voltage symbol i cc i ilk v il v ih v ol v oh ? ? 5 2.0 0 4.6 ? ? ? ? ? ?? 0.85 2.8 0.8 0.4 5 5 min. typ. max. unit ma a v v v v ? analog characteristics (unless otherwise noted, v cc =5v, vref h =5v, vref l =0v, ta=25 c) parameter conditions comsumption current buffer amplifier output voltage range buffer amplifier output drive range d/a converter lower reference voltage range d/a converter upper reference voltage range differential nonlinearity error nonlinearity error accuracy this product is not designed for protection against radioactive rays. buffer amplifier output impedance pull-up i/o-cell internal r value zero code error full scale error symbol iref h vref h vref l v o i o s dl s l s zero s full r o ? 3.0 0 0.1 0.2 ? 2 ? 1.0 ? 3.5 ? 25 ? 25 ? 4.5 ? ? ? ? ? ? ? ? ? 5 7.5 5 1.5 4.9 4.75 2 1.0 3.5 25 25 15 ma v v v lsb ma mv ? rup 12.5 25 37.5 k ? 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 volateg range. upper saturation voltage=0.35v lower saturation voltage=0.23v win : 0v (resistance value alters by the applied voltage) i o = 100 a i o = + 1.0ma vref h =4.796v, vref l =0.7v v cc =5.5v (4mv / lsb) without load (i o = + 0ma) min. typ. max. unit
BU2507FV optical disc ics 5/8 ? ac characteristics (unless otherwise noted, v cc =5v, vref h =5v, vref l =0v, ta=25 c) parameter conditions ld hold time c l 1000pf v o : 0.5v ? 4.5v the time until the becomes the final value of 1/2 lsb. reset "l" pulse width clock rise time clock fall time tcr tcf clock "l" pulse width ld "h" pulse duration data set up time data hold time d / a output setting time ld set up time symbol t rtl t ckl t dch t chd t chl t ldc t ldh t ldd ?? ? 50 50 20 40 50 50 50 7 ?? clock "h" pulse width t ckh 50 ?? ?? ? ? ? ? ?? ? ? ? ? 50 20 min. typ. max. unit s ns clk reset di ld da output t dch t chd t ckl t ckh tcr tcf t rtl fig.1 t ldh t chl t ldd t ldc
BU2507FV optical disc ics 6/8 ! ! ! ! circuit operations ? digital data format (data : lsb first) d/a output d/a converter data bit address select data bit address selection don't care don't care don't care don't care don't care don't care don't care don't care a o 1 selection a o 2 selection a o 3 selection a o 4 selection a o 5 selection a o 6 selection command for test command for test (vref h -vref l ) / 1024 1 + vref l (vref h -vref l ) / 1024 2 + vref l (vref h -vref l ) / 1024 3 + vref l (vref h -vref l ) / 1024 1022 + vref l (vref h -vref l ) / 1024 1023 + vref l vref l ? vref h =v dd vref l =v ss 0 0 0 0 1 1 d13 0 0 0 0 1 1 d12 d13 last msb first lsb d12 d11 d10 d9 d8 d7 d6 d5 d3 d2 d4 d1 d0 0 0 0 0 1 1 d11 0 0 0 0 1 1 d10 0 0 0 0 1 1 d9 0 0 0 0 1 1 d8 0 0 0 0 1 1 d7 0 0 0 0 1 1 d6 0 0 1 1 1 1 d5 0 1 0 1 0 1 d4 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 d3 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 d2 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 d1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 0 d0 ? timing chart (model) di clk ld da output d0 lsb msb d1 d2 d3 d11 d12 d13 fig.2
BU2507FV optical disc ics 7/8 ! ! ! ! application circuit vref h vcc gnd vref l controller ld reset clk di ao1 ch1 ao2 ch2 ao3 ch3 ao6 ch6 ! ! ! ! operation notes ? there are 3 different type of power supply terminal and 1 type of gnd terminal in this ic. each of there terminalsrequires the constant power supply for operating. ? pile up ripple and noise to there power supply terminals, it can?t keep accuracy of the d/a converter. therefore external bypass capacitor recommend to set as close as possible to the terminals between v dd 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. ? reset terminal uses the i/o-cell of the internal pull-up resistance, adding a capacitor between this terminal and gnd, this ic will have equivalent function as power-on-reset, by making a time-delay. when a reset signal is inputted from the controller, it is possible that the output of all channels are fixed on low-level in the ?l? section on the pulse.
BU2507FV optical disc ics 8/8 ! ! ! ! external dimensions (units : mm) ssop-b14 8 7 14 1 0.1 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
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