View LTC1655L_6038439.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

1 ltc1655/LTC1655L 16-bit rail-to-rail micropower dacs in so-8 package n 16-bit monotonicity over temperature n deglitched rail-to-rail voltage output n so-8 package n i cc(typ) : 600 m a n internal reference: 2.048v (ltc1655) 1.25v (LTC1655L) n maximum dnl error: 1lsb n settling time: 20 m s to 1lsb n 750khz max update rate n power-on reset to zero volts n 3-wire cascadable serial interface n low cost n pin compatible upgrade for ltc1451 12-bit dac family the ltc ? 1655/LTC1655L are rail-to-rail voltage output, 16-bit digital-to-analog converters in an so-8 package. they include an output buffer and a reference. the 3-wire serial interface is compatible with spi/qspi and microwire tm protocols. the clk input has a schmitt trigger that allows direct optocoupler interface. the ltc1655 has an onboard 2.048v reference that can be overdriven to a higher voltage. the output swings from 0v to 4.096v when using the internal reference. the typical power dissipation is 3.0mw on a single 5v supply. the LTC1655L has an onboard 1.25v reference that can be overdriven to a higher voltage. the output swings from 0v to 2.5v when using the internal reference. the typical power dissipation is 1.8mw on a single 3v supply. the ltc1655/LTC1655L are pin compatible with linear technologys 12-bit v out dac family, allowing an easy upgrade path. they are the only buffered 16-bit dacs in an so-8 package and they include an onboard reference for standalone performance. n digital calibration n industrial process control n automatic test equipment n cellular telephones , ltc and lt are registered trademarks of linear technology corporation. microwire is a trademark of national semiconductor corporation. + 16-bit dac ltc1655: 4.5v to 5.5v LTC1655L: 2.7v to 5.5v ltc1655: 2.048v LTC1655L: 1.25v gnd power-on reset to other dacs 16-bit shift reg and dac latch m p d in v cc 16 ref 2 86 d out 4 5 1655/55l ta01 clk 1 cs/ld 3 7 v out ref functional block diagram: 16-bit rail-to-rail dac differential nonlinearity vs input code code 0 1.0 0.2 0.4 0.6 0.8 0 0.2 0.4 0.6 0.8 1.0 dnl error (lsb) 16384 32768 1655/55l ta02 49152 65535 applicatio s u features descriptio u fu ctio al block diagra uu w
2 ltc1655/LTC1655L absolute m axi m u m ratings w ww u order part number wu u package / o rder i for atio ltc1655cn8 ltc1655in8 ltc1655cs8 ltc1655is8 LTC1655Lcn8 LTC1655Lin8 LTC1655Lcs8 LTC1655Lis8 s8 part marking 1655 1655i 1655l 1655li consult factory for military grade parts. (note 1) v cc to gnd .............................................. C 0.5v to 7.5v ttl input voltage .................................... C 0.5v to 7.5v v out , ref ....................................... C 0.5v to v cc + 0.5v maximum junction temperature ......................... 125 c operating temperature range ltc1655c/LTC1655Lc ........................... 0 c to 70 c ltc1655i/LTC1655Li ........................ C 40 c to 85 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c 1 2 3 4 8 7 6 5 top view v cc v out ref gnd clk d in cs/ld d out s8 package 8-lead plastic so n8 package 8-lead pdip t jmax = 125 c, q ja = 100 c/w (n8) t jmax = 125 c, q ja = 150 c/w (s8) the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v cc = 4.5v to 5.5v (ltc1655), v cc = 2.7v to 5.5v (LTC1655L); v out unloaded, ref unloaded, unless otherwise noted. electrical characteristics symbol parameter conditions min typ max units dac resolution l 16 bits monotonicity l 16 bits dnl differential nonlinearity guaranteed monotonic (note 2) ltc1655, ref = 2.2v, v cc = 5v (note 8) (external) l 0.3 1.0 lsb LTC1655L, ref = 2.2v, v cc = 5v (note 8) (external) l 0.5 1.0 lsb inl integral nonlinearity ltc1655, ref = 2.2v, v cc = 5v (note 8) (external) l 8 20 lsb LTC1655L, ref = 2.2v, v cc = 5v (note 8) (external) l 8 20 lsb zse zero scale error ltc1655 l 0 3.0 mv LTC1655L l 0 3.5 mv v os offset error measured at code 200 ltc1655, ref = 2.2v, v cc = 5v (note 8) (external) l 0.5 3.0 mv LTC1655L, ref = 1.3v, v cc = 2.7v (note 8) (external) l 0.5 3.5 mv v os tc offset error tempco 5 m v/ c gain error ref = 2.2v (external), v cc = 5v (note 8) l 5 16 lsb gain error drift 0.5 ppm/ c power supply v cc positive supply voltage for specified performance ltc1655 l 4.5 5.5 v LTC1655L l 2.7 5.5 v i cc supply current (note 3) l 600 1200 m a
3 ltc1655/LTC1655L electrical characteristics the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v cc = 4.5v to 5.5v (ltc1655), v cc = 2.7v to 5.5v (LTC1655L); v out unloaded, ref unloaded, unless otherwise noted. op amp dc performance short-circuit current low v out shorted to gnd ltc1655 l 70 120 ma LTC1655L l 70 140 ma short-circuit current high v out shorted to v cc ltc1655 l 80 140 ma LTC1655L l 70 150 ma output impedance to gnd input code = 0 ltc1655 l 40 120 w LTC1655L l 70 160 w output line regulation input code = 65535, with internal reference 3 mv/v ac performance voltage output slew rate (note 4) l 0.3 0.7 v/ m s voltage output settling time (note 4) to 0.0015% (16-bit settling time), v cc = 5v 20 m s (note 4) to 0.012% (13-bit settling time), v cc = 5v 10 m s digital feedthrough (note 5) 0.3 nv -s midscale glitch impulse dac switched between 8000 h and 7fff h 12 nv-s output voltage noise ltc1655, at 1khz 280 nv ? hz spectral density LTC1655L, at 1khz 220 nv ? hz reference output reference output voltage ltc1655 l 2.036 2.048 2.060 v LTC1655L l 1.240 1.250 1.260 v reference input range (notes 6, 7) ltc1655 2.2 v cc /2 v LTC1655L 1.3 v cc /2 v reference output tempco ltc1655 5 ppm/ c LTC1655L 10 ppm/ c reference input resistance ltc1655, ref overdriven to 2.2v l 8.5 13 k w LTC1655L, ref overdriven to 1.3v l 7.0 13 k w reference short-circuit current l 40 100 ma reference output line regulation 1.5 mv/v reference load regulation i out = 100 m a l 5 mv/a reference output voltage noise ltc1655, at 1khz 150 nv ? hz spectral density LTC1655L, at 1khz 115 nv ? hz digital i/o v ih digital input high voltage ltc1655 l 2.4 v LTC1655L l 2.0 v v il digital input low voltage ltc1655 l 0.8 v LTC1655L l 0.6 v v oh digital output high voltage ltc1655, i out = C 1ma l v cc C 1.0 v LTC1655L, i out = C 1ma l v cc C 0.7 v v ol digital output low voltage ltc1655, i out = 1ma l 0.4 v LTC1655L, i out = 1ma l 0.4 v symbol parameter conditions min typ max units
4 ltc1655/LTC1655L electrical characteristics the l denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v cc = 4.5v to 5.5v (ltc1655), v cc = 2.7v to 5.5v (LTC1655L); v out unloaded, ref unloaded, unless otherwise noted. note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: nonlinearity is defined from code 128 to code 65535 (full scale). see applications information. note 3: dac switched between all 1s and all 0s. v fs = 4.096v. note 4: digital inputs at 0v or v cc . note 5: part is clocked with pin toggling between 1s and 0s, cs/ld is low. note 6: reference can be overdriven (see applications information). note 7: guaranteed by design. not subject to test. note 8: guaranteed by correlation for other reference and supply conditions. i leak digital input leakage v in = gnd to v cc l 10 m a c in digital input capacitance (note 7) 10 pf switching t 1 d in valid to clk setup ltc1655 l 40 ns LTC1655L l 60 ns t 2 d in valid to clk hold ltc1655 l 0ns LTC1655L l 0ns t 3 clk high time ltc1655 l 40 ns LTC1655L l 60 ns t 4 clk low time ltc1655 l 40 ns LTC1655L l 60 ns t 5 cs/ld pulse width ltc1655 l 50 ns LTC1655L l 80 ns t 6 lsb clk to cs/ld ltc1655 l 40 ns LTC1655L l 60 ns t 7 cs/ld low to clk ltc1655 l 20 ns LTC1655L l 30 ns t 8 d out output delay ltc1655, c load = 15pf l 20 120 ns LTC1655L, c load = 15pf l 20 300 ns t 9 clk low to cs/ld low ltc1655 l 20 ns LTC1655L l 30 ns symbol parameter conditions min typ max units
5 ltc1655/LTC1655L typical perfor m a n ce characteristics uw digital input code 0 differential nonlinearity (lsb) 65,535 1655/55l g01 16,384 32,768 49,152 1.0 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1.0 tc1655 differential nonlinearity load current (ma) 0 v cc ?v out (v) 1.2 1.0 0.8 0.6 0.4 0.2 0 1655/55l g03 5 10 15 125 c 25 c ?5 c ? v out < 1lsb v out = 4.096v code: all 1? digital input code 0 integral nonlinearity (lsb) 65,535 1655/55l g02 16,384 32,768 49,152 10 8 6 4 2 0 ? ? ? ? ?0 ltc1655 integral nonlinearity ltc1655 minimum supply headroom for full output swing vs load current v cc = 5v (ltc1655), v cc = 3v (LTC1655L) unless otherwise noted. LTC1655L differential nonlinearity LTC1655L integral nonlinearity LTC1655L minimum supply headroom for full output swing vs load current digital input code 0 differential nonlinearity (lsb) 65,535 1655/55l g01a 16,384 32,768 49,152 1.0 0.8 0.6 0.4 0.2 0 0.2 0.4 0.6 0.8 1.0 digital input code 128 integral nonlinearity (lsb) 65,535 1655/55l g02a 16,480 32,832 49,184 10 8 6 4 2 0 ? ? ? ? ?0 load current (ma) 0 v cc ?v out (v) 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 1655/55l g03a 5 10 15 ? v out < 1lsb v out = 2.5v code: all 1? 125 c 25 c ?5 c
6 ltc1655/LTC1655L typical perfor m a n ce characteristics uw output sink current (ma) 0 output pull-down voltage (v) 1.0 0.8 0.6 0.4 0.2 0 1655/55l g04 5 10 15 125 c 25 c ?5 c code: all 0s ltc1655 minimum output voltage vs output sink current ltc1655 full-scale voltage vs temperature temperature ( c) ?5 full-scale voltage (v) 4.10 4.09 4.08 4.07 ?5 53565 1655/55l g05 95 125 LTC1655L minimum output voltage vs output sink current temperature ( c) ?5 offset (mv) 125 1655/55l g06 ?0 35 80 1.0 0.8 0.6 0.4 0.2 0 ?.2 ?.4 ?.6 ?.8 ?.0 ltc1655 offset vs temperature LTC1655L full-scale voltage vs temperature LTC1655L offset vs temperature temperature ( c) ?5 full-scale voltage (v) 2.510 2.505 2.500 2.495 2.490 ?5 53565 1655/55l g05a 95 125 output sink current (ma) 0 output pull-down voltage (v) 0.8 0.6 0.4 0.2 0 1655/55l g04a 5 10 15 code: all 0s 125 c 25 c ?5 c temperature ( c) ?5 offset (mv) 125 1655/55l g06a ?0 35 80 0.6 0.5 0.4 0.3 0.2 0.1 0 v cc = 5v (ltc1655), v cc = 3v (LTC1655L) unless otherwise noted.
7 ltc1655/LTC1655L temperature ( c) ?5 supply current ? a) ?5 25 45 125 1655/55l g08 ?5 5 65 85 105 700 680 660 640 620 600 580 v cc = 5.5v v cc = 5v v cc = 4.5v ltc1655 supply current vs temperature logic input voltage (v) 0 supply current (ma) 3.0 2.6 2.2 1.8 1.4 1.0 0.6 4 1655/55l g07 1 2 3 5 ltc1655 supply current vs logic input voltage v cc = 5v (ltc1655), v cc = 3v (LTC1655L) unless otherwise noted. LTC1655L supply current vs temperature LTC1655L supply current vs logic input voltage logic input voltage (v) 0123 supply current (ma) 1.0 0.8 0.6 0.4 1655/55l g07a temperature ( c) ?5 supply current ? a) ?5 25 45 125 1655/55l g08a ?5 5 65 85 105 580 560 540 520 500 480 460 v cc = 3.3v v cc = 3v v cc = 2.7v ltc1655 large-signal transient response LTC1655L large-signal transient response time (5 s/div) output voltage (v) 1655/55l g10 3 2 1 0 v out unloaded t a = 25 c time (5 s/div) output voltage (v) 1655/55l g09 5 4 3 2 1 0 v out unloaded t a = 25 c typical perfor m a n ce characteristics uw
8 ltc1655/LTC1655L pi n fu n ctio n s uuu clk (pin 1): the ttl level input for the serial interface clock. d in (pin 2): the ttl level input for the serial interface data. data on the d in pin is latched into the shift register on the rising edge of the serial clock and is loaded msb first. the ltc1655/LTC1655L requires a 16-bit word. cs/ld (pin 3): the ttl level input for the serial inter- face enable and load control. when cs/ld is low, the clk signal is enabled, so the data can be clocked in. when cs/ld is pulled high, data is loaded from the shift register into the dac register, updating the dac output. d out (pin 4): output of the shift register. becomes valid on the rising edge of the serial clock and swings from gnd to v cc . gnd (pin 5): ground. ref (pin 6): reference. output of the internal reference is 2.048v (ltc1655), 1.25v (LTC1655L). there is a gain of two from this pin to the output. the reference can be overdriven from 2.2v to v cc /2 (ltc1655) and 1.3v to v cc /2 (LTC1655L). when tied to v cc /2, the output will swing from gnd to v cc . the output can only swing to within its offset specification of v cc (see applications information). v out (pin 7): deglitched rail-to-rail voltage output. v out clears to 0v on power-up. v cc (pin 8): positive supply input. 4.5v v cc 5.5v (ltc1655), 2.7v v cc 5.5v (LTC1655L). requires a 0.1 m f bypass capacitor to ground. ti i g diagra wu w d15 msb d14 d13 d1 t 1 t 6 d0 lsb t 2 t 4 t 3 t 8 clk d in d out cs/ld t 5 1655/55l td d15 previous word d14 previous word d0 previous word d15 current word d13 previous word t 9 t 7 12 3 15 16
9 ltc1655/LTC1655L defi itio s uu differential nonlinearity (dnl): the difference between the measured change and the ideal 1lsb change for any two adjacent codes. the dnl error between any two codes is calculated as follows: dnl = ( d v out C lsb)/lsb where d v out is the measured voltage difference between two adjacent codes. digital feedthrough: the glitch that appears at the analog output caused by ac coupling from the digital inputs when they change state. the area of the glitch is specified in (nv)(sec). full-scale error (fse): the deviation of the actual full- scale voltage from ideal. fse includes the effects of offset and gain errors (see applications information). gain error (ge): the difference between the full-scale output of a dac from its ideal full-scale value after offset error has been adjusted. integral nonlinearity (inl): the deviation from a straight line passing through the endpoints of the dac transfer curve (endpoint inl). because the output cannot go below zero, the linearity is measured between full scale and the lowest code that guarantees the output will be greater than zero. the inl error at a given input code is calculated as follows: inl = [v out C v os C (v fs C v os )(code/65535)]/lsb where v out is the output voltage of the dac measured at the given input code. least significant bit (lsb): the ideal voltage difference between two successive codes. lsb = 2v ref /65536 resolution (n): defines the number of dac output states (2 n ) that divide the full-scale range. resolution does not imply linearity. voltage offset error (v os ): nominally, the voltage at the output when the dac is loaded with all zeros. a single supply dac can have a true negative offset, but the output cannot go below zero (see applications information). for this reason, single supply dac offset is measured at the lowest code that guarantees the output will be greater than zero. operatio u serial interface the data on the d in input is loaded into the shift register on the rising edge of the clock. the msb is loaded first. the dac register loads the data from the shift register when cs/ld is pulled high. the clock is disabled internally when cs/ld is high. note: clk must be low before cs/ld is pulled low to avoid an extra internal clock pulse. the input word must be 16 bits wide. the buffered output of the 16-bit shift register is available on the d out pin which swings from gnd to v cc . multiple ltc1655s/LTC1655Ls may be daisy-chained to- gether by connecting the d out pin to the d in pin of the next chip while the clock and cs/ld signals remain common to all chips in the daisy chain. the serial data is clocked to all of the chips, then the cs/ld signal is pulled high to update all of them simultaneously. the shift register and dac register are cleared to all 0s on power-up. voltage output the ltc1655/LTC1655L rail-to-rail buffered output can source or sink 5ma over the entire operating temperature range while pulling to within 600mv of the positive supply voltage or ground. the output stage is equipped with a deglitcher that gives a midscale glitch of 12nv-s. at power- up, the output clears to 0v. the output swings to within a few millivolts of either sup- ply rail when unloaded and has an equivalent output resis- tance of 40 w (70 w for the LTC1655L) when driving a load to the rails. the output can drive 1000pf without going into oscillation.
10 ltc1655/LTC1655L applicatio n s i n for m atio n wu u u rail-to-rail output considerations in any rail-to-rail dac, the output swing is limited to voltages within the supply range. if the dac offset is negative, the output for the lowest codes limits at 0v as shown in figure 1b. similarly, limiting can occur near full-scale when the ref pin is tied to v cc /2. if v ref = v cc /2 and the dac full-scale error (fse) is positive, the output for the highest codes limits at v cc as shown in figure 1c. no full-scale limiting can occur if v ref is less than (v cc C fse)/2. offset and linearity are defined and tested over the region of the dac transfer function where no output limiting can occur. figure 1. effects of rail-to-rail operation on a dac transfer curve. (a) overall transfer function (b) effect of negative offset for codes near zero scale (c) effect of positive full-scale error for input codes near full scale when v ref = v cc /2 1655/55l f01 input code output voltage negative offset 0v 32768 0 65535 input code output voltage v ref = v cc /2 v cc v cc v ref = v cc /2 input code output voltage positive fse (1b) (1a) (1c)
11 ltc1655/LTC1655L typical applicatio n s u this circuit shows how to use an ltc1655 to make an optoisolated digitally controlled 4ma to 20ma process controller. the controller circuitry, including the optoisolation, is powered by the loop voltage that can have a wide range of 6v to 30v. the 2.048v reference output of the ltc1655 is used for the 4ma offset current and v out is used for the digitally controlled 0ma to 16ma current. r s is a sense resistor and the op amp modulates the transistor q1 to provide the 4ma to 20ma current through this resistor. the potentiometers allow for offset and full- scale adjustment. the control circuitry dissipates well under the 4ma budget at zero scale. 1655/55l ta03 3k 10k 1k 75k 1% 5k 150k 1% 20k q1 2n3440 r s 10 w v loop 6v to 30v i out out in clk d in cs/ld clk d in cs/ld clk d in cs/ld v cc v out 1 m f ltc1655 4n28 optoisolators 5v 500 w lt 1121-5 from optoisolated inputs v ref gnd + lt 1077 1 86 5 7 2 3 6 7 4 3 2 an isolated 4ma to 20ma process controller
12 ltc1655/LTC1655L typical applicatio n s u this circuit shows how to make a bipolar output 16-bit dac with a wide output swing using an ltc1655 and an lt1077. r1 and r2 resistively divide down the ltc1655 output and an offset is summed in using the ltc1655 onboard 2.048v reference and r3 and r4. r5 ensures that the onboard reference is always sourcing current and never has to sink any current even when v out is at full scale. the lt1077 output will have a wide bipolar output swing of C 4.096v to 4.096v as shown in the figure below. with this output swing 1lsb = 125 m v. a wide swing, bipolar output 16-bit dac clk d in cs/ld m p 0.1 m f v cc v out gnd v ref r1 100k 1% 5v ltc1655 1655/55l ta05 + lt1077 5v ?v r2 200k 1% r3 100k 1% r5 100k 1% r4 200k 1% (2)(d in )(4.096) 65536 v out : d in v out 4.096 4.096 32768 0 65535 transfer curve ?4.096v 1 6 8 5 7 2 3 6 7 4 3 2
13 ltc1655/LTC1655L typical applicatio n s u this circuit shows a digitally programmable current source from an external voltage source using an external op amp, an lt1218 and an npn transistor (2n3440). any digital word from 0 to 65535 is loaded into the ltc1655 and its output correspondingly swings from 0v to 4.096v. this voltage will be forced across the resistor r a . if r a is chosen to be 412 w , the output current will range from 0ma at zero scale to 10ma at full scale. the minimum voltage for v s is determined by the load resistor r l and q1s v cesat voltage. with a load resistor of 50 w , the voltage source can be 5v. clk d in cs/ld 0.1 f v cc v out gnd 5v ltc1655 p 1655/55l ta04 + lt1218 5v < v s < 100v for r l 50 q1 2n3440 r a 412 1% r l i out = ? 0ma to 10ma (d in )(4.096) (65536)(r a ) 1 8 5 7 2 3 6 7 4 3 2 digitally programmable current source
14 ltc1655/LTC1655L dimensions in inches (millimeters) unless otherwise noted. package descriptio n u n8 package 8-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) n8 1098 0.100 (2.54) bsc 0.065 (1.651) typ 0.045 ?0.065 (1.143 ?1.651) 0.130 0.005 (3.302 0.127) 0.020 (0.508) min 0.018 0.003 (0.457 0.076) 0.125 (3.175) min 12 3 4 87 6 5 0.255 0.015* (6.477 0.381) 0.400* (10.160) max 0.009 ?0.015 (0.229 ?0.381) 0.300 ?0.325 (7.620 ?8.255) 0.325 +0.035 0.015 +0.889 0.381 8.255 () *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.010 inch (0.254mm)
15 ltc1655/LTC1655L dimensions in inches (millimeters) unless otherwise noted. package descriptio n u s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) 0.016 ?0.050 (0.406 ?1.270) 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 1298 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) typ 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) bsc 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side * ** information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
16 ltc1655/LTC1655L ? linear technology corporation 1998 16555lf lt/tp 0800 4k ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com part number description comments ltc1257 single 12-bit v out dac, full scale: 2.048v, v cc : 4.75v to 15.75v, 5v to 15v single supply, complete v out dac so-8 package in reference can be overdriven up to 12v, i.e., fs max = 12v ltc1446/ dual 12-bit v out dacs in so-8 package ltc1446: v cc = 4.5v to 5.5v, v out = 0v to 4.095v ltc1446l ltc1446l: v cc = 2.7v to 5.5v, v out = 0v to 2.5v ltc1448 dual 12-bit v out dac, v cc : 2.7v to 5.5v output swings from gnd to ref. ref input can be tied to v cc ltc1450/ single 12-bit v out dacs with parallel interface ltc1450: v cc = 4.5v to 5.5v, v out = 0v to 4.095v ltc1450l ltc1450l: v cc = 2.7v to 5.5v, v out = 0v to 2.5v ltc1451 single rail-to-rail 12-bit dac, full scale: 4.095v, v cc : 4.5v to 5.5v, 5v, low power complete v out dac in so-8 package internal 2.048v reference brought out to pin ltc1452 single rail-to-rail 12-bit v out multiplying dac, v cc : 2.7v to 5.5v low power, multiplying v out dac with rail-to-rail buffer amplifier in so-8 package ltc1453 single rail-to-rail 12-bit v out dac, full scale: 2.5v, v cc : 2.7v to 5.5v 3v, low power, complete v out dac in so-8 package ltc1454/ dual 12-bit v out dacs in so-16 package with added functionality ltc1454: v cc = 4.5v to 5.5v, v out = 0v to 4.095v ltc1454l ltc1454l: v cc = 2.7v to 5.5v, v out = 0v to 2.5v ltc1456 single rail-to-rail output 12-bit dac with clear pin, low power, complete v out dac in so-8 full scale: 4.095v, v cc : 4.5v to 5.5v package with clear pin ltc1458/ quad 12 bit rail-to-rail output dacs with added functionality ltc1458: v cc = 4.5v to 5.5v, v out = 0v to 4.095v ltc1458l ltc1458l: v cc = 2.7v to 5.5v, v out = 0v to 2.5v ltc1650 single 16-bit v out industrial dac in 16-pin so, v cc = 5v low power, deglitched, 4-quadrant mulitplying v out dac, output swing 4.5v ltc1654 dual 14-bit dac 1lsb dnl, 2 dacs in so-8 footprint ltc1657/ single 16-bit v out dac with parallel interface ltc1657: v cc = 5v, low power, deglitched, v out = 0v to 4.096v ltc1657l ltc1657l: v cc = 3v, low power, deglitched, v out = 0v to 2.5v ltc1658 single rail-to-rail 14-bit v out dac in 8-pin msop, low power, multiplying v out dac in ms8 package. output v cc = 2.7v to 5.5v swings from gnd to ref. ref input can be tied to v cc ltc1659 single rail-to-rail 12-bit v out dac in 8-pin msop, low power, multiplying v out dac in ms8 package. output v cc = 2.7v to 5.5v swings from gnd to ref. ref input can be tied to v cc related parts typical applicatio n u clk d in cs/ld m p 0.1 m f v cc v out gnd r1 100k 5v ?v ltc1655/ LTC1655L 1655/55l ta06 1 8 5 7 2 3 this circuit shows how to measure negative offset. since ltc1655/LTC1655L operate on a single supply, if its offset is negative, the output for code 0 limits to 0v. to measure this negative offset, a negative supply is needed. connect resistor r1 as shown in the figure below. the output voltage is the offset when code 0 is loaded in. negative offset measurement

▲Up To Search▲

Price & Availability of LTC1655L

	To Download LTC1655L Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .