LTC1289 3 Volt Single Chip 12-Bit Data Acquisition System FEATURES DESCRIPTIO Single Supply 3.3V or 3.3V Operation The LTC 1289 is a 3V data acquisition component which Software Programmable Features contains a serial I/O successive approximation A/D con- Unipolar/Bipolar Conversions verter. The device specifications are guaranteed at a TM 4 Differential/8 Single-Ended Inputs supply voltage of 2.7V. It uses LTCMOS switched ca- Variable Data Word Length pacitor technology to perform a 12-bit unipolar, or 11-bit Power Shutdown plus sign bipolar A/D conversion. The 8 channel input Built-In Sample-and-Hold multiplexer can be configured for either single-ended or Direct 4-Wire Interface to Most MPU Serial Ports differential inputs (or combinations thereof). An on-chip and All MPU Parallel Ports sample and hold is included for all single-ended input 25kHz Maximum Throughput Rate channels. When the LTC1289 is idle it can be powered Available in 20-Lead PDIP and 20-Lead SW Packages down in applications where low power consumption is desired. U The serial I/O is designed to be compatible with industry APPLICATIO S standard full duplex serial interfaces. It allows either MSB- Minimum Guaranteed Supply Voltage: 2.7V or LSB- first data and automatically provides 2s comple- Resolution: 12 Bits ment output coding in the bipolar mode. The output data Fast Conversion Time: 26s Max Over Temp word can be programmed for a length of 8, 12 or 16 bits. Low Supply Currents: 1.0mA This allows easy interface to shift registers and a variety of processors. , LT, LTC and LTM 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. TYPICAL APPLICATIO Single Cell 3V 12-Bit Data Acquisition System +3V CH0 V CC 3V 1N4148 CH1 ACLK 22F LITHIUM 10k TANTALUM CH2 SCLK + BOOST V 10 TO AND 1/4 LTC1079 CH3 D FROM + IN CAP OSC MPU LTC1044 CH4 D + OUT LTC1289 GND LV 1N4148 10F 10F CH5 CS CAP V 3V OUT + CH6 REF 3V LT1004-1.2 22F 22F CH7 REF FOR OVERVOLTAGE PROTECTION ON ONLY ONE CHANNEL LIMIT THE INPUT COM V CURRENT TO 15mA. FOR MORE THAN DGND AGND ONE CHANNEL LIMIT THE INPUT 0.1F 1N5817 CURRENT TO 7mA PER CHANNEL AND 28mA FOR ALL CHANNELS. CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED OR ANY OTHER LTC1289 TA01 CHANNEL IS OVERVOLTAGED (V < V IN or V > V ). IN CC 1289fb 1 + + + + U ULTC1289 ABSOLUTEXAI U RATI GS (Notes 1 and 2) Supply Voltage V to GND or V ........................... 12V Power Dissipation............................................. 500mW CC Negative Supply Voltage (V ) .................... 6V to GND Operating Temperature Range Voltage LTC1289BC, LTC1289CC......................... 0C to 70C Analog and Reference Inputs... (V ) 0.3V to V + 0.3V Storage Temperature Range ................ 65C to 150C CC Digital Inputs ........................................ 0.3V to 12V Lead Temperature (Soldering, 10 sec.)................ 300C Digital Outputs ........................... 0.3V to V + 0.3V CC PACKAGE/ORDER I FOR ATIO TOP VIEW 1 20 V CH0 CC TOP VIEW 2 19 ACLK CH1 CH0 1 20 V CC 3 18 SCLK CH2 CH1 2 19 ACLK 4 17 D CH3 IN CH2 3 18 SCLK 5 16 D CH4 OUT CH3 4 17 DIN 6 15 CS CH5 CH4 5 16 D OUT + 7 14 REF CH6 CH5 6 15 CS 8 13 REF CH7 + CH6 7 14 REF COM 9 12 V CH7 8 13 REF DGND 10 11 AGND COM 9 12 V N PACKAGE, 20-LEAD PLASTIC DIP DGND 10 11 AGND T = 110C, = 100C/W (N) JMAX JA SW PACKAGE J PACKAGE, 20-LEAD CERAMIC DIP 20-LEAD PLASTIC SO WIDE T = 150C, = 80C/W (J) JMAX JA T = 110C, = 150C/W (SW) JMAX JA OBSOLETE PACKAGE Consider the N Package for Alternate Source ORDER PART NUMBER ORDER PART NUMBER LTC1289BCN LTC1289BIJ LTC1289BCSW LTC1289CCN LTC1289CIJ LTC1289CCSW LTC1289BCJ LTC1289CCJ Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: