LTC1454/LTC1454L Dual 12-Bit Rail-to-Rail Micropower DACs DESCRIPTION FEATURES n 12-Bit Resolution The LTC 1454/LTC1454L are complete single supply, n Buffered True Rail-to-Rail Voltage Output dual rail-to-rail voltage output, 12-bit digital-to-analog n 5V Operation, I : 700m A Typ (LTC1454) converters (DACs) in a 16-lead SO package. They include CC n 3V Operation, I : 450m A Typ (LTC1454L) an output buffer amplifier with variable gain ( 1 or 2) CC n Built-In Reference: 2.048V (LTC1454) and an easy-to-use 3-wire cascadable serial interface. 1.220V (LTC1454L) The LTC1454 has an onboard reference of 2.048V and a n CLR Pin full-scale output of 4.095V in a 2 gain configuration. It n Power-On Reset operates from a single 4.5V to 5.5V supply. n 16-Lead SO Package n The LTC1454L has an onboard 1.22V reference and a full- 3-Wire Cascadable Serial Interface n scale output of 2.5V in a 2 gain configuration. It operates Maximum DNL Error: 0.5LSB n from a single 2.7V to 5.5V supply. Low Cost U Low power supply current, excellent DNL and small size APPLICATIONS allow these parts to be used in a host of applications where n size, DNL and single supply operation are important. Digital Calibration n Industrial Process Control n Automatic Test Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. n Cellular Telephones TYPICAL APPLICATION Daisy-Chained Control Outputs Functional Block Diagram: Dual 12-Bit Rail-to-Rail DAC Differential Nonlinearity vs Input Code LTC1454: 2.048V LTC1454: 5V LTC1454L: 1.22V LTC1454L: 3V TO 5V 9, 15 10 0.5 V REFOUT CC 14 REFHI B 0.4 0.3 + V OUT B 16 0.2 D 4 IN 0.1 12-BIT DAC B 0 3 CLK 24-BIT m P 1 X1/X2 B 0.1 SHIFT REFHI A 11 REG 5 CS/LD 0.2 AND DAC + 0.3 V D OUT A 8 6 OUT LATCH 12-BIT 0.4 DAC A 0.5 0 512 1024 1536 2048 2560 3072 3584 4095 7 X1/X2 A CODE POWER-ON RESET 1454 G08 REFLO GND CLR 12 13 2 1454 BD02 1 DNL ERROR (LSB) U ULTC1454/LTC1454L ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER I FOR ATIO V to GND .............................................. 0.5V to 7.5V CC TOP VIEW ORDER PART Logic Inputs to GND ................................ 0.5V to 7.5V NUMBER X1/X2 B 1 16 V OUT B V , V , X1/X2 A, OUT A OUT B CLR 2 15 V CC X1/X2 B ..................................... 0.5V to V + 0.5V CC LTC1454CN CLK 3 14 REFHI B REFHI A, REFHI B, REFLO ............. 0.5V to V + 0.5V LTC1454IN CC D 4 13 GND IN Maximum Junction Temperature .......................... 125 C LTC1454CS CS/LD 5 12 REFLO Operating Temperature Range LTC1454IS D 6 11 REFHI A OUT LTC1454LCN LTC1454C/LTC1454LC ............................ 0 C to 70 C X1/X2 A 7 10 REFOUT LTC1454LIN V 8 9 V LTC1454I/LTC1454LI ........................ 40 C to 85 C OUT A CC LTC1454LCS Storage Temperature Range ................ 65 C to 150 C N PACKAGE S PACKAGE LTC1454LIS 16-LEAD PDIP 16-LEAD PLASTIC SO Lead Temperature (Soldering, 10 sec)................. 300 C T = 125 C, q = 100 C/W (N) JMAX JA T = 125 C, q = 150 C/W (S) JMAX JA Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS V = 4.5V to 5.5V (LTC1454), 2.7V to 5.5V (LTC1454L), X1/X2 = REFLO = GND, REFHI = REFOUT, V and REFOUT unloaded, CC OUT T = T to T , unless otherwise noted. A MIN MAX SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DAC Resolution l 12 Bits DNL Differential Nonlinearity Guaranteed Monotonic (Note 1) l 0.5 LSB INL Integral Nonlinearity T = 25 C 2.0 4.0 LSB A (Note 1) l 2.5 4.5 LSB V Offset Error T = 25 C 2.0 12 mV OS A l 4.0 18 mV V TC Offset Error Temperature 15 m V/ C OS Coefficient V Full-Scale Voltage When Using Internal Reference, LTC1454, T = 25 C 4.065 4.095 4.125 V FS A LTC1454 l 4.045 4.095 4.145 V When Using Internal Reference, LTC1454L, T = 25 C 2.470 2.500 2.530 V A LTC1454L 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 LTC1454 l 2.008 2.048 2.088 V LTC1454L 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, LTC1454 l 0.2 1.5 LSB OUT LTC1454L 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 Reference Input Capacitance 15 pF Short-Circuit Current REFOUT Shorted to GND l 40 120 mA 2 U U WWW WU