LTC1290 Single Chip 12-Bit Data Acquisition System FEATURES DESCRIPTIO Software Programmable Features The LTC 1290 is a data acquisition component which Unipolar/Bipolar Conversion contains a serial I/O successive approximation A/D con- TM Four Differential/Eight Single-Ended Inputs verter. It uses LTCMOS switched capacitor technology MSB- or LSB-First Data Sequence to perform either 12-bit unipolar or 11-bit plus sign bipolar Variable Data Word Length A/D conversions. The 8-channel input multiplexer can be Power Shutdown configured for either single-ended or differential inputs (or Built-In Sample-and-Hold combinations thereof). An on-chip sample-and-hold is Single Supply 5V or 5V Operation included for all single-ended input channels. When the Direct Four-Wire Interface to Most MPU Serial Ports LTC1290 is idle it can be powered down with a serial word and All MPU Parallel Ports in applications where low power consumption is desired. 50kHz Maximum Throughput Rate The serial I/O is designed to be compatible with industry Available in 20-Lead PDIP and SO Wide Packages standard full duplex serial interfaces. It allows either MSB- U or LSB-first data and automatically provides 2 s comple- KEY SPECIFICATIO S ment output coding in the bipolar mode. The output data Resolution: 12 Bits word can be programmed for a length of 8, 12 or 16 bits. Fast Conversion Time: 13s Max Over Temp This allows easy interface to shift registers and a variety of Low Supply Current: 6.0mA processors. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5287525. TYPICAL APPLICATIO 12-Bit 8-Channel Sampling Data Acquisition System SINGLE-ENDED INPUT 1k 0V TO 5V OR 5V CH0 V 5V CC + 15V OVERVOLTAGE RANGE* 22F 1N5817 CH1 ACLK TANTALUM CH2 SCLK TO AND FROM CH3 D IN 1N4148 MICROPROCESSOR DIFFERENTIAL INPUT (+) CH4 D OUT LTC1290 5V COMMON MODE RANGE () CH5 CS + CH6 REF 8V TO 40V LT 1027 + 4.7F CH7 REF 1F TANTALUM COM V 5V DGND AGND 1N5817 0.1F 1290 TA01 * FOR OVERVOLTAGE PROTECTION ON ONLY ONE CHANNEL LIMIT THE INPUT CURRENT TO 15mA. FOR OVERVOLTAGE PROTECTION ON MORE THAN ONE CHANNEL LIMIT THE INPUT CURRENT TO 7mA PER CHANNEL AND 28mA FOR ALL CHANNELS. (SEE SECTION ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION SECTION.) CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED OR ANY OTHER CHANNEL IS OVERVOLTAGED (V < V OR V > V ). IN IN CC 1290fe 1 U ULTC1290 ABSOLUTEXAI U RATI GS (Notes 1, 2) Supply Voltage (V ) to GND or V ........................ 12V Operating Temperature Range CC Negative Supply Voltage (V ) .................... 6V to GND LTC1290BC, LTC1290CC, LTC1290DC .... 0C to 70C Voltage LTC1290BI, LTC1290CI, LTC1290DI .... 40C to 85C Analog/Reference Inputs ......... (V ) 0.3V to V + 0.3V LTC1290BM, LTC1290CM, CC Digital Inputs ........................................ 0.3V to 12V LTC1290DM (OBSOLETE) ............ 55C to 125C Digital Outputs ........................... 0.3V to V + 0.3V Storage Temperature Range ................ 65C to 150C CC Power Dissipation............................................. 500mW Lead Temperature (Soldering, 10 sec.)................ 300C PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW 1 20 V CH0 1 20 CH0 V CC CC 2 19 ACLK CH1 2 19 ACLK CH1 3 18 SCLK CH2 3 18 SCLK CH2 4 17 D CH3 4 17 D CH3 IN IN 5 16 D CH4 5 16 D CH4 OUT OUT 6 15 CS CH5 6 15 CS CH5 + + 7 14 REF CH6 7 14 REF CH6 8 13 REF CH7 8 13 REF CH7 9 12 V COM 9 12 V COM 10 11 AGND DGND 10 11 AGND DGND N PACKAGE SW PACKAGE 20-LEAD PDIP 20-LEAD PLASTIC SO WIDE T = 110C, = 130C/W (SW) JMAX JA T = 110C, = 100C/W (N) JMAX JA ORDER PART NUMBER N PART MARKING ORDER PART NUMBER SW PART MARKING LTC1290BIN LTC1290BCSW LTC1290CIN LTC1290CCSW LTC1290DIN LTC1290DCSW LTC1290BCN LTC1290BISW LTC1290CCN LTC1290CISW LTC1290DCN LTC1290DISW J PACKAGE 20-LEAD CERAMIC DIP T = 150C, q = 80C/W (J) JMAX JA LTC1290BMJ LTC1290CMJ LTC1290DMJ LTC1290BIJ LTC1290CIJ LTC1290DIJ OBSOLETE PACKAGE Consider N Package for Alternate Source Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: