LTC1450/LTC1450L Parallel Input, 12-Bit Rail-to-Rail Micropower DACs in SSOP FEATURES DESCRIPTION n Guaranteed Monotonic The LTC 1450/LTC1450L are complete single supply, rail- n Buffered True Rail-to-Rail Voltage Output to-rail voltage output, 12-bit digital-to-analog converters n 12-Bit Resolution (DACs) in a 24-pin SSOP or PDIP package. They include an n 3V Operation (LTC1450L) I : 250A Typ CC output buffer amplifier, reference and a double buffered n 5V Operation (LTC1450) I : 400A Typ parallel digital interface. CC n Parallel 12-Bit or 8 + 4-Bit Double Buffered The LTC1450 operates from a 4.5V to 5.5V supply. The Digital Input output can be pin strapped for 4.095V or 2.048V full-scale. n Internal Reference It has a 2.048V internal reference. n Output Buffer Configurable to Gain of 1 or 2 n Configurable as a Multiplying DAC The LTC1450L operates from a 2.7V to 5.5V supply. The n Internal Power-On Reset output can be pin strapped for 2.5V or 1.22V full-scale. It n has a 1.22V internal reference. Maximum DNL Error: 0.5LSB U The LTC1450/LTC1450L offer true stand-alone perfor- APPLICATIONS mance. In addition, the reference output, high and low n Digital Calibration reference inputs and gain setting resistor are brought to n Industrial Process Control pins for maximum flexibility. n Automatic Test Equipment , LTC and LT are registered trademarks of Linear Technology Corporation. n Arbitrary Function Generators n Battery-Powered Data Conversion Products n Feedback Control Loops and Gain Control TYPICAL APPLICATION LTC1450: 5V LTC1450L: 3V TO 5V REFHI V REFOUT CC D11 (MSB) REFERENCE UPPER LTC1450: 2.048V 4-BIT LTC1450L: 1.22V INPUT Differential Nonlinearity D8 LATCH 12-BIT vs Input Code DAC D7 LATCH 0.5 DATA IN FROM 12-BIT MICROPROCESSOR + LTC1450: DAC V OUT DATA BUS 0V TO 4.095V LOWER LTC1450L: 8-BIT 0V TO 2.5V INPUT LATCH 0.0 D0 (LSB) CSMSB WR FROM MICROPROCESSOR CSLSB DECODE LOGIC 0.5 LDAC 0 512 1024 1536 2048 2560 3072 3584 4095 POWER-ON RESET LTC1450 CODE CLR FROM LTC1450L 1450/50L TA02 SYSTEM RESET GND REFLO X1/X2 1450/50L TA01 1 DNL ERROR (LSB) U ULTC1450/LTC1450L ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION V to GND .............................................. 0.5V to 7.5V CC TOP VIEW ORDER PART Logic Inputs to GND ................................ 0.5V to 7.5V NUMBER WR 1 24 LDAC V .............................................. 0.5V to V + 0.5V 2 23 CLR OUT CC CSLSB LTC1450CG 3 22 X1/X2 REFOUT, REFLO, REFHI, X1/X2 ..... 0.5V to V + 0.5V CSMSB CC (LSB) D0 4 21 V LTC1450CN OUT Maximum Junction Temperature .......................... 125C 5 V D1 20 CC LTC1450IG Operating Temperature Range 6 19 REFOUT D2 LTC1450IN Commercial ........................................... 0C to 70C D3 7 18 REFHI LTC1450LCG Industrial ......................................... 40C to 85C D4 8 17 REFLO LTC1450LCN 9 16 GND Storage Temperature Range ................ 65C to 150C D5 LTC1450LIG D6 10 15 D11(MSB) Lead Temperature (Soldering, 10 sec)................. 300C LTC1450LIN D7 11 14 D10 12 D9 D8 13 G PACKAGE N PACKAGE 24-LEAD PLASTIC SSOP 24-LEAD PLASTIC PDIP T = 125C, = 95C/ W (G) JMAX JA T = 125C, = 58C/ W (N) JMAX JA Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS V = 4.5V to 5.5V (LTC1450), 2.7V to 5.5V (LTC1450L), V unloaded, CC OUT REFOUT = REFHI, REFLO = GND = X1/X2, 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 = 25C 3.5 LSB A (Note 1) l 4.0 LSB V Offset Error T = 25C 12 mV OS A l 18 mV V TC Offset Error Temperature Coefficient 15 V/C OS V Full-Scale Voltage Using Internal Reference, LTC1450, T = 25C 4.065 4.095 4.125 V FS A Using Internal Reference, LTC1450 l 4.045 4.095 4.145 V External 2.048V Reference, LTC1450 l 4.075 4.095 4.115 V Using Internal Reference, LTC1450L, T = 25C 2.470 2.500 2.530 V A Using Internal Reference, LTC1450L l 2.460 2.500 2.540 V External 1.22V Reference, LTC1450L l 2.480 2.500 2.520 V V TC Full-Scale Voltage Temperature Coefficient Using Internal Reference, LTC1450 0.10 LSB/C FS Using External Reference, LTC1450/LTC1450L 0.02 LSB/C Using Internal Reference, LTC1450L 0.10 LSB/C Reference Output (REFOUT) Reference Output Voltage LTC1450L l 1.195 1.220 1.245 V LTC1450 l 2.008 2.048 2.088 V Reference Output Temperature Coefficient 0.08 LSB/C Reference Line Regulation l 0.7 2LSB/V Reference Load Regulation 0 I 100A, LTC1450L l 0.6 3.0 LSB OUT LTC1450 l 0.2 1.5 LSB Short-Circuit Current REFOUT Shorted to GND l 80 mA 2 U W U W U WW