LTC1458/LTC1458L Quad 12-Bit Rail-to-Rail Micropower DACs FEATURES DESCRIPTIO n Quad 12-Bit DAC The LTC 1458/LTC1458L are complete single supply, n Buffered True Rail-to-Rail Voltage Output quad rail-to-rail voltage output, 12-bit digital-to-analog n Maximum DNL Error: 0.5LSB converters (DACs) in SO-28 and SSOP-28 packages. They n 5V Operation, I : 1.1mA Typ (LTC1458) include an output buffer amplifier with variable gain ( 1 or CC n 3V Operation, I : 800m A Typ (LTC1458L) 2) and an easy-to-use 3-wire cascadable serial interface. CC n Internal or External Reference Operation The LTC1458 has an onboard reference of 2.048V and a n Settling Time: 14m s to 0.5LSB full-scale output of 4.095V in a 2 gain configuration. It n Schmitt Trigger On Clock Input Allows Direct operates from a single 4.5V to 5.5V supply dissipating Optocoupler Interface only 5.5mW (I = 1.1mA typ). CC n Power-On Reset and CLR Pin n The LTC1458L has an onboard 1.22V reference and a full- SSOP-28 Package n scale output of 2.5V in a 2 gain configuration. It operates 3-Wire Cascadable Serial Interface with 250kHz from a single supply of 2.7V to 5.5V dissipating 2.4mW. Update Rate n Low Cost Excellent DNL, low supply current and a wide range of built-in functions allow these parts to be used in a host of U applications when flexibility, power and single supply APPLICATIO S operation are important. n Digital Calibration , LTC and LT are registered trademarks of Linear Technology Corporation. n Industrial Process Control n Automatic Test Equipment n Low Power Systems TYPICAL APPLICATIO Daisy-Chained Control Outputs Functional Block Diagram: Quad 12-Bit Rail-to-Rail DAC 2.048V (LTC1458) FROM m P 5V (LTC1458) 1.22V (LTC1458L) 3V TO 5V (LTC1458L) Differential Nonlinearity vs Input Code D REFOUT CS/LD CLK V IN CC 0.5 REFHI C REFHI B 0.4 0.3 V V 0.2 OUT C OUT B DAC C DAC B 0.1 X1/X2 C X1/X2 B 48-BIT 0 REFLO C REFLO B SHIFT REGISTER 0.1 AND REFHI D REFHI A 0.2 DAC REGISTER V V OUT A OUT D 0.3 DAC D DAC A X1/X2 D X1/X2 A 0.4 REFLO D 0.5 REFLO A 0 512 1024 1536 2048 2560 3072 3584 4095 D CLR OUT CODE 1458 G09 1458 BD01 1 DNL (LSB) U ULTC1458/LTC1458L UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW V to GND .............................................. 0.5V to 7.5V ORDER PART CC 1 28 V X1/X2 C CC Logic Inputs to GND ................................ 0.5V to 7.5V NUMBER 2 27 X1/X2 B V OUT C V , V , V , V , 3 26 V CS/LD OUT A OUT B OUT C OUT D OUT B 4 25 CLR D X1/X2 A, X1/X2 B, X1/X2 C, IN LTC1458CG 5 24 REFHI B REFHI C X1/X2 D ......................................... 0.5V to V + 0.5V LTC1458CSW CC 6 23 GND GND 7 22 REFLO B REFHI A, REFHI B, REFHI C, REFHI D, REFLO C LTC1458LCG 8 21 REFLO A REFLO D LTC1458LCSW REFLO A, REFLO B, REFLO C, 9 20 REFHI A REFHI D LTC1458IG REFLO D ........................................ 0.5V to V + 0.5V 10 19 REFOUT D CC OUT 11 18 NC LTC1458ISW CLK Maximum Junction Temperature ......................... 125 C 12 17 V NC OUT A LTC1458LIG Operating Temperature Range 13 16 X1/X2 A V OUT D LTC1458LISW 14 15 V X1/X2 D LTC1458C/LTC1458LC ............................ 0 C to 70 C CC LTC1458I/LTC1458LI ........................ 40 C to 85 C G PACKAGE SW PACKAGE 28-LEAD PLASTIC SSOP 28-LEAD PLASTIC SO Storage Temperature Range ................ 65 C to 150 C T = 125 C, q = 100 C/W (G) JMAX JA Lead Temperature (Soldering, 10 sec)................. 300 C T = 125 C, q = 150 C/W (SW) JMAX JA Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = T to T . V = 4.5V to 5.5V (LTC1458), 2.7V to 5.5V (LTC1458L), A MIN MAX CC X1/X2 = REFLO = GND, REFHI = REFOUT, V unloaded, unless otherwise noted. OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DAC Resolution l 12 Bits DNL Differential Nonlinearity Guaranteed Monotonic (Note 2) l 0.5 LSB INL Integral Nonlinearity T = 25 C 1.75 4.0 LSB A (Note 2) l 2.25 4.5 LSB V Offset Error T = 25 C 3.0 12 mV OS A l 6.0 18 mV V TC Offset Error Temperature 15 m V/ C OS Coefficient V Full-Scale Voltage When Using Internal Reference, LTC1458, T = 25 C 4.065 4.095 4.125 V FS A LTC1458 l 4.045 4.095 4.145 V When Using Internal Reference, LTC1458L, T = 25 C 2.470 2.500 2.530 V A LTC1458L l 2.460 2.500 2.540 V V TC Full-Scale Voltage When Using Internal Reference 24 ppm/ C FS Temperature Coefficient Reference Reference Output Voltage LTC1458 l 2.008 2.048 2.088 V LTC1458L l 1.195 1.220 1.245 V Reference Output 20 ppm/ C Temperature Coefficient Reference Line Regulation l 0.7 2.0 LSB/V Reference Load Regulation 0 I 100m A, LTC1458 l 0.2 1.5 LSB OUT LTC1458L l 0.6 3.0 LSB Reference Input Range V V 1.5V V /2 V REFHI CC CC Reference Input Resistance l 15 24 40 kW 2 U WWW