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LTC1861 - µPower, 12-Bit, 250ksps 1- and 2-Channel ADCs in MSOP

The LTC1860/LTC1861 are 12-bit A/D converters that are offered in MSOP and SO-8 packages and operate on a single 5V supply. At 250ksps, the supply current is only 850µA. The supply current drops at lower speeds because the LTC1860/LTC1861 automatically power down to a typical supply current of 1nA between conversions. These 12-bit switched capacitor successive approximation ADCs include sample-and-holds. The LTC1860 has a differential analog input with an adjustable reference pin. The LTC1861 offers a software-selectable 2-channel MUX and an adjustable reference pin on the MSOP version.

The 3-wire, serial I/O, MSOP or SO-8 package and extremely high sample rate-to-power ratio make these ADCs ideal choices for compact, low power, high speed systems.

These ADCs can be used in ratiometric applications or with external references. The high impedance analog inputs and 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.

Features 12-Bit 250ksps ADC in MSOP Package Single 5V Supply Low Supply Current: 850µA (Typ) Auto Shutdown Reduces Supply Current to 2µA at 1ksps True Differential Inputs 1-Channel (LTC1860) or 2-Channel (LTC1861) Versions SPI/MICROWIRE™ Compatible Serial I/O High Speed Upgrade to LTC1286/LTC1298 Pin Compatible with 16-Bit LTC1864/LTC1865 Guaranteed Operation to 125°C (MSOP Package) Typical Application

Applications High Speed Data Acquisition Portable or Compact Instrumentation Low Power Battery-Operated Instrumentation Isolated and/or Remote Data Acquisition Packaging