LTC1286/LTC1298 Micropower Sampling 12-Bit A/D Converters In S0-8 Packages DESCRIPTION FEATURES n 12-Bit Resolution The LTC1286/LTC1298 are micropower, 12-bit, succes- n 8-Pin SOIC Plastic Package sive approximation sampling A/D converters. They typi- n Low Cost cally draw only 250m A of supply current when converting n Low Supply Current: 250m A Typ. and automatically power down to a typical supply current n Auto Shutdown to 1nA Typ. of 1nA whenever they are not performing conversions. n Guaranteed 3/4LSB Max DNL They are packaged in 8-pin SO packages and operate on n Single Supply 5V to 9V Operation 5V to 9V supplies. These 12-bit, switched-capacitor, suc- n On-Chip Sample-and-Hold cessive approximation ADCs include sample-and-holds. n 60m s Conversion Time The LTC1286 has a single differential analog input. The n Sampling Rates: LTC1298 offers a software selectable 2-channel MUX. 12.5 ksps (LTC1286) On-chip serial ports allow efficient data transfer to a wide 11.1 ksps (LTC1298) range of microprocessors and microcontrollers over three n I/O Compatible with SPI, Microwire, etc. wires. This, coupled with micropower consumption, makes n Differential Inputs (LTC1286) remote location possible and facilitates transmitting data n 2-Channel MUX (LTC1298) through isolation barriers. n 3V Versions Available: LTC1285/LTC1288 These circuits can be used in ratiometric applications or APPLICATIONS with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to n Battery-Operated Systems 1.5V full scale) allow direct connection to sensors and n Remote Data Acquisition transducers in many applications, eliminating the need for n Battery Monitoring gain stages. n Handheld Terminal Interface n Temperature Measurement n Isolated Data Acquisition TYPICAL APPLICATIONS N 25m W, S0-8 Package, 12-Bit ADC Supply Current vs Sample Rate Samples at 200Hz and Runs Off a 5V Supply 1000 T = 25C A V = V = 5V CC REF 4.7m F 5V f = 200kHz CLK m 100 MPU (e.g., 8051) 1 8 V V P1.4 REF CC 2 7 10 CLK P1.3 ANALOG INPUT +IN LTC1286 3 6 P1.2 0V TO 5V RANGE IN D OUT SERIAL DATA LINK 4 5 GND CS/SHDN LTC1286/98 TA01 1 0.1k 1k 10k 100k SAMPLE FREQUENCY (Hz) LTC1286/98 TA02 1 SUPPLY CURRENT ( A) U U ULTC1286/LTC1298 ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2) Supply Voltage (V ) to GND................................... 12V Power Dissipation.............................................. 500mW CC Voltage Operating Temperature Range Analog and Reference ................ 0.3V to V + 0.3V LTC1286C/LTC1298C............................. 0 C to 70 C CC Digital Inputs......................................... 0.3V to 12V LTC1286I/LTC1298I ........................... 40 C to 85 C Digital Output ............................. 0.3V to V + 0.3V Storage Temperature Range ................. 65 C to 150 C CC Lead Temperature (Soldering, 10 sec.)................ 300 C PACKAGE/ORDER INFORMATION TOP VIEW TOP VIEW ORDER PART ORDER PART V 1 8 V V 1 8 V NUMBER REF NUMBER REF CC CC +IN 2 7 CLK +IN 2 7 CLK LTC1286CS8 LTC1286CN8 3 D IN 6 IN 3 6 D OUT OUT LTC1286IS8 LTC1286IN8 GND 4 5 CS/SHDN GND CS/SHDN 4 5 N8 PACKAGE S8 PACKAGE PART MARKING 8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC T = 150 C, q = 130 C/W JMAX JA T = 150 C, q = 175 C/W 1286 JMAX JA 1286I TOP VIEW TOP VIEW ORDER PART ORDER PART 1 V (V ) NUMBER CS/SHDN 1 8 V (V ) CS/SHDN 8 NUMBER CC REF CC REF CH0 2 7 CLK CH0 2 7 CLK LTC1298CS8 LTC1298CN8 3 D CH1 6 CH1 3 6 D OUT OUT LTC1298IS8 LTC1298IN8 GND 4 5 D IN GND 4 5 D IN PART MARKING N8 PACKAGE S8 PACKAGE 8-LEAD PLASTIC DIP 8-LEAD PLASTIC SOIC 1298 = 150 C, q = 175 C/W T = 150 C, q = 130 C/W T JMAX JA JMAX JA 1298I Consult factory for military grade parts. RECOM ENDED OPERATING CONDITIONS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply Voltage (Note 3) LTC1286 4.5 9.0 V CC LTC1298 4.5 5.5 V f Clock Frequency V = 5V (Note 4) 200 kHz CLK CC t Total Cycle Time LTC1286, f = 200kHz 80 m s CYC CLK = 200kHz 90 m s LTC1298, f CLK t Hold Time, D After CLK V = 5V 150 ns hDI IN CC t Setup Time CS Before First CLK (See Operating Sequence) LTC1286, V = 5V 2 m s suCS CC LTC1298, V = 5V 2 m s CC t Setup Time, D Stable Before CLK V = 5V 400 ns suDI IN CC t CLK High Time V = 5V 2 m s WHCLK CC t CLK Low Time V = 5V 2 m s WLCLK CC t CS High Time Between Data Transfer Cycles V = 5V 2 m s WHCS CC t CS Low Time During Data Transfer LTC1286, f = 200kHz 75 m s WLCS CLK LTC1298, f = 200kHz 85 m s CLK 2 U U U U WW UUW WWW