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LTC1288 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1288 Datasheet(HTML) 1 Page - Linear Technology |
1 / 24 page 1 LTC1285/LTC1288 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages s 12-Bit Resolution s 8-Pin SO Plastic Package s Low Cost s Low Supply Current: 160 µA Typ s Auto Shutdown to 1nA Typ s Guaranteed ±3/4LSB Max DNL s Single Supply 3V to 6V Operation s Differential Inputs (LTC1285) s 2-Channel MUX (LTC1288) s On-Chip Sample-and-Hold s 100 µs Conversion Time s Sampling Rates: 7.5ksps (LTC1285) 6.6ksps (LTC1288) s I/O Compatible with SPI, Microwire, etc. The LTC ®1285/LTC1288 are 3V micropower, 12-bit, suc- cessive approximation sampling A/D converters. They typically draw only 160 µA of supply current when con- verting and automatically power down to a typical supply current of 1nA whenever they are not performing conver- sions. They are packaged in 8-pin SO packages and operate on 3V to 6V supplies. These 12-bit, switched- capacitor, successive approximation ADCs include sample-and-holds. The LTC1285 has a single differential analog input. The LTC1288 offers a software selectable 2-channel MUX. On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers. These circuits can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to 1.5V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages. APPLICATIONS SAMPLE FREQUENCY (kHz) 0.1 1 10 100 1000 1 10 100 LTC1285/88 • TA02 TA = 25°C VCC = 2.7V VREF = 2.5V fCLK = 120kHz Supply Current vs Sample Rate s Pen Screen Digitizing s Battery-Operated Systems s Remote Data Acquisition s Isolated Data Acquisition s Battery Monitoring s Temperature Measurement 12 µW, S0-8 Package, 12-Bit ADC Samples at 200Hz and Runs Off a 3V Supply 3V 1 µF ANALOG INPUT 0V TO 3V RANGE –IN GND VCC CLK DOUT VREF LTC1285 MPU (e.g., 8051) P1.4 P1.3 P1.2 +IN LTC1285/88 • TA01 CS/SHDN 6 5 8 7 3 4 1 2 SERIAL DATA LINK FEATURES DESCRIPTION TYPICAL APPLICATIONS N , LTC and LT are registered trademarks of Linear Technology Corporation. |
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