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general description the max5383/max5384/max5385 low-cost, 8-bit digital-to-analog converters (dacs) in miniature 6-pin sot23 packages have a simple 3-wire, spi/qspi/ microwire-compatible serial interface that operates up to 10mhz. the max5383 has an internal +2v refer- ence and operates from a +2.7v to +3.6v supply. the max5384 has an internal +4v reference and operates from a +4.5v to +5.5v supply. the max5385 operates over the full +2.7v to +5.5v supply range and has an internal reference equal to 0.9 ? v dd . the max5383/max5384/max5385 require an extremelylow supply current of only 150? (typ) and provide a buffered voltage output. these devices power up at zero code and remain there until a new code is written to the dac registers. this provides additional safety for appli- cations that drive valves or other transducers that need to be off on power-up. the max5383/max5384/ max5385 include a 1?, low-power shutdown mode that features software-selectable output loads of 1k ? , 100k ? , or 1m ? to ground. applications automatic tuning (vco)power amplifier bias control programmable threshold levels automatic gain control automatic offset adjustment features ? 8-bit resolution in a miniature 6-pin sot23package ? wide +2.7v to +5.5v supply range (max5385) ? <1 a shutdown mode ? software-selectable output resistance duringshutdown ? buffered output drives resistive loads ? low-glitch power-on reset to zero dac output ? 3-wire spi/qspi/microwire-compatible interface ? < ?% full-scale error (max5385) ? < ?lsb max inl/dnl ? low 230 a (max) supply current max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 ________________________________________________________________ maxim integrated products 1 gnd din v dd 1 + 6 5 sclk out max5383max5384 max5385 sot23 top view 234 cs pin configuration gnd mc68xxxx pcs0 v dd out sck mosi sclk din max5385 +2.7v to +5.5v cs typical operating circuit 19-1718; rev 3; 1/09 ordering information spi and qspi are trademarks of motorola, inc. microwire is a trademark of national semiconductor corp. part temp range pin-package sot top mark max5383 eut+t -40 c to +85 c 6 sot23 aadf max5383ezt+t -40 c to +85 c 6 sot23-thin aaah max5384 eut+t -40 c to +85 c 6 sot23 aadh max5384ezt+t -40 c to +85 c 6 sot23-thin aaai max5385 eut+t -40 c to +85 c 6 sot23 aadj MAX5385EZT+t -40 c to +85 c 6 sot23-thin aaaj selector guide part internal reference max5383 2v max5384 4v max5385 0.9 ? v dd for price, delivery, and to place orders, please contact maxim distribution at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + denotes lead(pb)-free/rohs-compliant package. t = tape and reel. downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v dd = +2.7v to +3.6v (max5383), v dd = +4.5v to +5.5v (max5384), v dd = +2.7v to +5.5v (max5385), r l = 10k ? , c l = 50pf, t a = t min to t max , unless otherwise noted. typical values are t a = +25?.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v dd to gnd ..............................................................-0.3v to +6v out ............................................................-0.3v to (v dd + 0.3v) cs , sclk, din to gnd ............................................-0.3v to +6v maximum current into any pin............................................50ma continuous power dissipation (t a = +70?) 6-pin sot23 (derate 8.7mw/? above +70?)..........696mw operating temperature range ...........................-40? to +85? storage temperature range .............................-65? to +150? maximum junction temperature .....................................+150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units static accuracy resolution 8 bits integral linearity error inl (note 1) 1 lsb differential linearity error dnl guaranteed monotonic 1 lsb offset error v os (note 2) 1 25 mv offset error supply rejection max5385 (notes 2, 3) 60 db max5383/max5384 3 offset error temperaturecoefficient max5385 1 ppm/ c m ax 5383/m ax 5384 10 full-scale error c ode = 255, no l oad max5385 5 % of i d eal fs full-scale error supplyrejection c od e = 255 ( n ote 4) m ax 5383/m ax 5384 50 db m ax 5383/m ax 5384 40 full-scale error temperaturecoefficient code = 255 max5385 10 ppm/ c dac output max5383 1.8 2 2.2 max5384 3.6 4 4.4 internal reference voltage(note 5) ref max5385 0.85 v dd 0.9 v dd 0.95 v dd v code = 255, 0 a to 100 a 0.5 output load regulation code = 0, 0 a to 100 a 0.5 lsb [d13, d12] = 0, 1 1k [d13, d12] = 1, 0 100k shutdown output resistanceto gnd v out = 0 to v dd [d13, d12] = 1, 1 1m ? dynamic performance voltage output slew rate positive and negative 0.4 v/ s output settling time to 1/2 lsb, 50k ? and 50pf load (note 6) 20 s digital feedthrough code = 0, all digital inputs from 0 to v dd 2 nvs downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 _______________________________________________________________________________________ 3 electrical characteristics (continued)(v dd = +2.7v to +3.6v (max5383), v dd = +4.5v to +5.5v (max5384), v dd = +2.7v to +5.5v (max5385), r l = 10k ? , c l = 50pf, t a = t min to t max , unless otherwise noted. typical values are t a = +25?.) timing characteristics(figures 3 and 4, v dd = +2.7v to +3.6v (max5383), v dd = +4.5v to +5.5v (max5384), v dd = +2.7v to +5.5v (max5385), r l = 10k ? , c l = 50pf, t a = t min to t max , unless otherwise noted. typical values are t a = +25?.) (note 7) parameter symbol conditions min typ max units digital-analog glitch impulse code 127 to 128 40 nvs wake-up time from software shutdown 50 s power requirements max5383 2.7 3.6 max5384 4.5 5.5 supply voltage v dd max5385 2.7 5.5 v no load, all digital inputs at 0 or v dd , code = 255 150 230 supply current i dd shutdown mode 1 a digital inputs input low voltage v il 0.3 v dd v input high voltage v ih 0.7 v dd v input hysteresis v h 0.05 v dd v input capacitance c in (note 7) 10 pf input leakage current i in 1 a parameter s ymbol conditions min typ max units sclk period t cp 100 ns sclk pulse width high t ch 40 ns sclk pulse width low t cl 40 ns cs fall to sclk rise setup time t css 40 ns sclk rise to cs rise hold time t csh 0n s din setup time t ds 40 ns din hold time t dh 0n s sclk rise to cs fall delay t cs0 10 ns downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 4 _______________________________________________________________________________________ -0.050-0.075 -0.100 0 -0.025 0.025 0.050 0.075 integral nonlinearity vs. code max5383/4/5-01 code inl (lsb) 0 100 150 50 200 250 300 0 -0.10-0.20 2.5 4.0 3.0 3.5 4.5 5.0 5.5 integral nonlinearity vs. supply voltage max5383/4/5-02 supply voltage (v) inl (lsb) -0.05 -0.15 0 -0.025-0.050 -40 20 -20 0 40 60 80 100 integral nonlinearity vs. temperature max5383/4/5-03 temperature ( c) inl (lsb) -0.020 -0.010-0.015 -0.005 0 0.005 0.010 0 100 200 300 differential nonlinearity vs. code max5383/4/5-04 code dnl (lsb) 0 -0.015-0.020 -0.010 -0.005-0.025 2.5 4.0 3.0 3.5 4.5 5.0 5.5 differential nonlinearity vs. supply voltage max5383/4/5-05 supply voltage (v) dnl (lsb) 0 -0.010-0.015 -0.020 -0.005-0.025 -40 20 -20 0 40 60 80 100 differential nonlinearity vs. temperature max5383/4/5-06 temperature ( c) dnl (lsb) typical operating characteristics (v dd = +3.0v (max5383), v dd = +5.0v (max5384/max5385), t a = +25?, unless otherwise noted.) timing characteristics (continued)(figures 3 and 4, v dd = +2.7v to +3.6v (max5383), v dd = +4.5v to +5.5v (max5384), v dd = +2.7v to +5.5v (max5385), r l = 10k ? , c l = 50pf, t a = t min to t max , unless otherwise noted. typical values are t a = +25?.) (note 7) note 1: guaranteed from code 5 to code 255. note 2: the offset value extrapolated from the range over which the inl is guaranteed. note 3: max5385 tested at 5v ?0%. note 4: max5383 tested at 3v ?0%; max5384 tested at 5v ?0%. note 5: actual output voltages at full-scale are 255/256 ? v ref . note 6: output settling time is measured by stepping from code 5 to code 255, and from code 255 to code 5. note 7: guaranteed by design. parameter symbol conditions min typ max units cs rise to sclk rise hold t cs1 40 ns cs pulse width high t csw 100 ns downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 _______________________________________________________________________________________ 5 -0.20 -0.10-0.15 -0.05 0 0.05 0.10 0.15 0 100 200 300 total unadjusted error vs. code max5383/4/5-07 code tue (lsb) 0 -0.25-0.50 2.5 4.0 3.0 3.5 4.5 5.0 5.5 offset error vs. supply voltage max5383/4/5-08 supply voltage (v) v os (mv) 0 -0.25-0.50 -40 20 -20 0 40 60 80 100 offset error vs. temperature max5383/4/5-09 temperature ( c) v os (mv) 0.750.25 0 -0.25-0.50 0.50 -0.75 2.5 4.0 3.0 3.5 4.5 5.0 5.5 full-scale error vs. supply voltage max5383/4/5-10 supply voltage (v) full-scale error (lsb) 1.20.4 0 -0.4-0.8 0.8 -1.2 full-scale error (%) max5384 max5383 max5385 0.750.25 0 -0.25-0.50 0.50 -0.75 1.20.4 0 -0.4-0.8 0.8 -1.2 -40 20 -20 0 40 60 80 100 full-scale error vs. temperature max5383/4/5-11 temperature ( c) full-scale error (lsb) full-scale error (%) max5385 max5383max5384 200140 120 100 60 80 20 40 160 180 0 2.5 4.0 3.0 3.5 4.5 5.0 5.5 supply current vs. supply voltage max5383/4/5-12 supply voltage (v) supply current ( a) max5383 max5384 max5385 160150 145 140 135 155130 -40 20 -20 0 40 60 80 100 supply current vs. temperature max5383/4/5-13 temperature ( c) supply current ( a) max5384 max5385 max5383 no load typical operating characteristics (continued) (v dd = +3.0v (max5383), v dd = +5.0v (max5384/max5385), t a = +25?, unless otherwise noted.) downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v dd = +3.0v (max5383), v dd = +5.0v (max5384/max5385), t a = +25?, unless otherwise noted.) 1.00.6 0.4 0.2 0.8 0 -40 20 -20 0 40 60 80 100 shutdown supply current vs. temperature max5383/4/5-16 temperature ( c) supply current ( a) v dd = +5v v dd = +3v 2.01.5 2.5 3.0 4.03.5 4.5 0 0.1 0.2 02 14 36 58 9 71 0 output load regulation max5383/4/5-17 load current (ma) a: max5384/max5385, v dd = +4.5v, full scale or sourcing b: max5383, full scale, v dd = +2.7v sinking, v dd = +5.0v sourcing c: max5383, full scale, v dd = +2.7v sourcing d: zero code, v dd = +2.7v sinking e: zero code, v dd = +5.5v sinking v out full scale (v) v out zero code (v) a b c d e 4 s/div output voltage on power-up max5383/4/5-18 out 50mv/div v dd 2v/div 10 s/div max5383 output voltage exiting shutdown max5383/4/5-19 out 500mv/div cs 3v/div shdn to 0 x 80 1 s/div max5383 output settling from 1/4fs to 3/4fs max5383/4/5-20 out 0.5v/div cs 3v/div 1 s/div max5383 output settling from 3/4fs to 1/4fs max5383/4/5-21 out 0.5v/div cs 3v/div 160150 145 140 135 155130 09 6 32 64 128 160 192 224 256 supply current vs. code max5383/4/5-14 code supply current ( a) max5384v dd = +5v max5385v dd = +5v max5383v dd = +3v max5383v dd = +5v 1.00.4 0.2 0.6 0.8 0 2.5 4.0 3.0 3.5 4.5 5.0 5.5 shutdown supply current vs. supply voltage max5383/4/5-15 supply voltage (v) supply current ( a) downloaded from: http:///
detailed description the max5383/max5384/max5385 voltage-output, 8-bitdacs ensure monotonic performance by offering full 8- bit performance with less than 1lsb integral nonlineari- ty error and less than 1lsb differential nonlinearity error. the devices use a simple 3-wire, spi/qspi/ microwire- compatible serial interface that operates up to 10mhz. they include an internal reference, anoutput buffer, and three low-current shutdown modes, making these devices ideal for low-power, highly inte- grated applications. figure 1 shows the devices?func- tional diagram. analog section the max5383/max5384/max5385 employ a current-steering dac topology as shown in figure 2. at the core of the dac is a reference voltage-to-current con- verter (v/i) that generates a reference current. this cur- rent is mirrored to 255 equally weighted current sources. dac switches control the outputs of these cur- rent mirrors so that only the desired fraction of the total current-mirror currents is steered to the dac output. the current is then converted to a voltage across a resistor, and this voltage is buffered by the output buffer amplifier. output voltage table 1 shows the relationship between the dac codeand the analog output voltage. the 8-bit dac code is binary unipolar with 1lsb = (v ref /256). the max5383/ max5384 have a full-scale output voltage of (+2v - 1lsb)and (+4v - 1lsb), set by the internal references. the max5385 has a full-scale output voltage of (0.9 ? v dd - 1lsb). output buffer the dac voltage output is an internally buffered unity-gain follower that slews up to ?.4v/?. the output can swing from 0 to full scale. with a 1/4fs to 3/4fs output transition, the amplifier outputs typically settle to 1/2lsb in less than 5? when loaded with 10k ? in par- allel with 50pf. the buffer amplifiers are stable with any max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 _______________________________________________________________________________________ 7 typical operating characteristics (continued) (v dd = +3.0v (max5383), v dd = +5.0v (max5384/max5385), t a = +25?, unless otherwise noted.) 2 s/div max5383 output settling 1lsb step up max5383/4/5-22 out 20mv/div ac-coupled 0 x 7f to 0 x 80 cs 3v/div max5383 output settling 1lsb step down max5383/4/5-23 out 20mv/div ac-coupled 2 s/div 0 x 80 to 0 x 7f cs 3v/div pin description pin name description 1 out dac voltage output 2 gnd ground 3v dd power-supply input 4 din serial data input 5 sclk serial clock input 6 cs chip-select input downloaded from: http:///
combination of resistive loads >10k ? and capacitive loads <50pf. power-on reset the max5383/max5384/max5385 have a power-onreset circuit to set the dac? output to 0 when v dd is first applied or when v dd dips below 1.7v (typ). this ensures that unwanted dac output voltages will notoccur immediately following a system startup, such as after a loss of power. the output glitch on startup is typ- ically less than 50mv. shutdown mode the max5383/max5384/max5385 include three soft-ware-controlled shutdown modes that reduce the supply current to <1?. all internal circuitry is disabled, and a known impedance is placed from out to gnd to ensure 0v while in shutdown. table 2 details the three shutdown modes of operation. digital section 3-wire serial interface the max5383/max5384/max5385s?digital interface isa standard 3-wire connection compatible with spi/qspi/microwire interfaces. the chip-select input ( cs ) frames the serial data loading at the data-input pin (din). immediately following cs ? high-to-low transition, the data is shifted synchronously and latched into theinput register on the rising edge of the serial clock input (sclk). after 16 bits have been loaded into the serial max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 8 _______________________________________________________________________________________ ref control logic data latch gnd out v dd current-steering dac serial input register sclk din cs 255 8 max5383max5384 max5385 figure 1. functional diagram sw1 sw2 sw255 out v ref figure 2. current-steering dac topology output voltage dac code [d11?4] max5383 max5384 max5385 1111 1111 2v (255/256) 4v (255/256) 0.9 v dd (255/256) 1000 0000 1v 2v 0.9 v dd / 2 0000 0001 7.8mv 15.6mv 0.9 v dd / 256 0000 0000 0 0 0 table 1. unipolar code output voltage downloaded from: http:///
input register, it transfers its contents to the dac latchon cs ? low-to-high transition (figure 3). note that if cs is not kept low during the entire 16 sclk cycles, datawill be corrupted. in this case, reload the dac latch with a new 16-bit word. the serial clock (sclk) can idle either high or low between transitions. figure 4 shows the complete 3-wire serial interface transmis- sion. table 3 lists serial interface mapping. applications information device powered by an external reference since the max5385 generates an output voltage pro-portional to v dd , a noisy power supply will affect the accuracy of the on-board reference, thereby affectingthe overall accuracy of the dac. the circuit in figure 5 rejects this power-supply noise by powering the device directly with a precision voltage reference, improving overall system accuracy. the max6103 (+3v, 75ppm) or the max6105 (+5v, 75ppm) precision voltage refer- ences are ideal choices due to the low power require- ments of the max5385. this solution is also useful when the required full-scale output voltage is different from the available supply voltages. digital inputs and interface logic the digital interface for the 8-bit dac is based on a3-wire standard that is compatible with spi, qspi, and microwire interfaces. the three digital inputs ( cs , din, and sclk) load the digital input serially into the dac.all the digital inputs include schmitt-trigger buffers to accept slow-transition interfaces. this means that opto- couplers can interface directly to the max5383/ max5384/max5385 without additional external logic. the digital inputs are compatible with cmos logic levels and can be driven with voltages up to +5.5v regardless of the supply voltage. power-supply bypassing and layout careful pc board layout is important for best systemperformance. to reduce crosstalk and noise injection, keep analog and digital signals separate. to ensure that the ground return from gnd to the supply ground is short and low impedance, a ground plane is recom- mended. bypass v dd with a 0.1? capacitor to ground as close as possible to the device. if the supply isexcessively noisy, connect a 10 ? resistor in series with the supply and v dd and add additional capacitance. max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 _______________________________________________________________________________________ 9 table 3. serial interface mapping x = don? care 16-bit serial word analog msb lsb output function xx00 0000 0000 xxxx 0v normal operation xx00 1111 1111 xxxx v ref (255/256) normal operation xx00 0000 0001 xxxx v ref (1/256) normal operation xx00 1000 0000 xxxx v ref (128/256) normal operation xx01 xxxx xxxx xxxx 0v shutdown, 1k ? to gnd xx10 xxxx xxxx xxxx 0v shutdown, 100k ? to gnd xx11 xxxx xxxx xxxx 0v shutdown, 1m ? to gnd table 2. shutdown modes dac code [d13 and d12] mode output resistance to ground ( ? ) maximum supply current ( a) 01 shutdown 1k 1 10 shutdown 100k 1 11 shutdown 1m 1 downloaded from: http:///
max5383/max5384/max5385 chip information transistor count: 2160 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 10 ______________________________________________________________________________________ t cso t ch t css t cl t dh t ds t csh t cs1 cs sclk din d15 d14 d0 figure 3. 3-wire serial interface timing diagram cs sclk din d15 d8 d7 d6 d5 d4 d3 d2 d1 d0 dac updated d14 d13 d12 d11 d10 d9 figure 4. complete 3-wire serial interface transmission gnd in out gnd v dd out sclk din +3.2v to +12v 0 to +2.7v +3.00v cs max6103 max5385 0.1 f figure 5. powering the max5385 with a precision voltage reference downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 ______________________________________________________________________________________ 11 6lsot.eps package outline, sot 6l body 21-0058 2 1 i package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a "+", "#", or "-" in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. package type package code document no. 6 sot23 u6-4 21-0058 6 sot23-thin z6-1 21-0114 downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 12 ______________________________________________________________________________________ package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a "+", "#", or "-" in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. package outline, sot 6l body 21-0058 2 2 i downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 ______________________________________________________________________________________ 13 6l thin sot23.eps package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a "+", "#", or "-" in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 14 ______________________________________________________________________________________ package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a "+", "#", or "-" in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. downloaded from: http:///
max5383/max5384/max5385 low-cost, low-power, 8-bit dacs with 3-wire serial interface in sot23 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 15 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 3 1/09 added lead-free designation to parts in the ordering information and added 21-0058 package diagram 1, 11 downloaded from: http:///

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