Datasheet LTC1860, LTC1861 (Analog Devices)

LTC1860/LTC1861 µPower, 12-Bit, 250ksps 1- and 2-Channel ADCs in MSOP
FeaTures DescripTion
n
12-Bit 250ksps ADCs in MSOP Package
The LTC®1860/LTC1861 are 12-bit A/D converters that are n Single 5V Supply offered in MSOP and SO-8 packages and operate on a single n Low Supply Current: 850µA (Typ) 5V supply. At 250ksps, the supply current is only 850µA. n Auto Shutdown Reduces Supply Current The supply current drops at lower speeds because the to 2µA at 1ksps LTC1860/LTC1861 automatically power down to a typical n True Differential Inputs supply current of 1nA between conversions. These 12-bit n 1-Channel (LTC1860) or 2-Channel (LTC1861) switched capacitor successive approximation ADCs include Versions sample-and-holds. The LTC1860 has a differential analog n SPI/MICROWIRETM Compatible Serial I/O input with an adjustable reference pin. The LTC1861 offers n High Speed Upgrade to LTC1286/LTC1298 a software-selectable 2-channel MUX and an adjustable n Pin Compatible with 16-Bit LTC1864/LTC1865 reference pin on the MSOP version. n Guaranteed Operation to 125°C (MSOP Package) The 3-wire, serial I/O, MSOP or SO-8 package and
applicaTions
extremely high sample rate-to-power ratio make these ADCs ideal choices for compact, low power, high speed n High Speed Data Acquisition systems. n Portable or Compact Instrumentation These ADCs can be used in ratiometric applications or with n Low Power Battery-Operated Instrumentation external references. The high impedance analog inputs and n Isolated and/or Remote Data Acquisition the ability to operate with reduced spans down to 1V full scale, allow direct connection to signal sources in many applications, eliminating the need for external gain stages. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion Single 5V Supply, 250ksps, 12-Bit Sampling ADC Supply Current vs Sampling Frequency
1µF 1000 5V 100 LTC1860 µA) 1 8 V 10 REF VCC 2 7 IN+ SCK ANALOG INPUT 3 6 SERIAL DATA LINK TO 0V TO 5V 1 IN– SDO ASIC, PLD, MPU, DSP 4 5 OR SHIFT REGISTERS GND CONV SUPPLY CURRENT ( 1860 TA01 0.1 0.010.01 0.1 1 10 100 1000 SAMPLING FREQUENCY (kHz) 1860 TA02 18601fb For more information www.linear.com/LTC1860 1 Document Outline Features Description Applications Typical Application Absolute Maximum Ratings Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Applications Information Package Description Typical Application Related Parts