LTC1291 Datasheet | Linear Technology

Single Chip 12-Bit Data Acquisition System Features s Built-In Sample-and-Hold s Single Supply 5V Operation s Power Shutdown s Direct 3- or 4-Wire Interface to Most MPU Serial Ports and All MPU Parallel Ports s Two-Channel Analog Multiplexer s Analog Inputs mon Mode to Supply Rails s 8-Pin DIP Package U KEY SPECIFICATIO S s Resolution: 12 Bits s Fast Conversion Time: 12µs Max Over Temp. s Low Supply Current: 6.0m A (Typ) Active Mode 10µA (Max) Shutdown Mode DESCRIPTIO The LTC®1291 is a data acquisition system that contains a serial I/O successive approximation A/D converter. It uses LTCMOSTM switched capacitor technology to perform a 12-bit unipolar A/D conversion. The input multiplexer can be configured for either single-ended or differential inputs. An on-chip sample-and-hold is included on the “+” input. When the LTC1291 is idle, it can be powered down in applications where low power consumption is desired. An external reference is not required because the LTC1291 takes its reference from the power supply (VCC). All these Features are packaged in an 8-pin DIP. The serial I/O is designed to municate without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing data to be transmitted over three or four wires. Given the accuracy, ease of use and small package size, this device is well suited for digitizing analog signals in remote applications where minimum number of interconnects, small physical size, and low power consumption are important. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOSTM is a trademark of Linear Technology Corporation TYPICAL APPLICATIO 2-Channel 12-Bit Data Acquisition System 22µF TANTALUM 5V + 2-CHANNEL MUX- CS VCC(VREF) CH0 CLK LTC1291 CH1 DOUT 0.1µF SCK MC68HC11 MISO GND DIN MOSI 1291 TA01 - FOR OVERVOLTAGE PROTECTION, LIMIT THE INPUT CURRENT TO 15m A PER PIN OR CLAMP THE INPUTS TO VCC AND GND WITH 1N4148 DIODES. CONVERSION RESULTS ARE NOT VALID WHEN...