Datasheet LTC1864, LTC1865 (Analog Devices)

LTC1864/LTC1865 µPower, 16-Bit, 250ksps 1- and 2-Channel ADCs in MSOP
FEATURES DESCRIPTION
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16-Bit 250ksps ADCs in MSOP Package
The LTC®1864/LTC1865 are 16-bit A/D converters that n Single 5V Supply are offered in MSOP and SO-8 packages and operate n Low Supply Current: 850μA (Typ) on a single 5V supply. At 250ksps, the supply current is n Auto Shutdown Reduces Supply Current only 850μA. The supply current drops at lower speeds to 2μA at 1ksps because the LTC1864/LTC1865 automatically power down n True Differential Inputs between conversions. These 16-bit switched capacitor n 1-Channel (LTC1864) or 2-Channel (LTC1865) successive approximation ADCs include sample-and- Versions holds. The LTC1864 has a differential analog input with an n SPI/MICROWIRE™ Compatible Serial I/O adjustable reference pin. The LTC1865 offers a software- n 16-Bit Upgrade to 12-Bit LTC1286/LTC1298 selectable 2-channel MUX and an adjustable reference pin n Pin Compatible with 12-Bit LTC1860/LTC1861 on the MSOP version. n Guaranteed Operation to +125°C (MSOP Package) The 3-wire, serial I/O, small MSOP or SO-8 package and extremely high sample rate-to-power ratio make these
APPLICATIONS
ADCs ideal choices for compact, low power, high speed systems. n High Speed Data Acquisition n These ADCs can be used in ratiometric applications or with Portable or Compact Instrumentation external references. The high impedance analog inputs n Low Power Battery-Operated Instrumentation and the ability to operate with reduced spans down to n Isolated and/or Remote Data Acquisition 1V full scale, allow direct connection to signal sources L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. in many applications, eliminating the need for external gain stages.
TYPICAL APPLICATION Single 5V Supply, 250ksps, 16-Bit Sampling ADC Supply Current vs Sampling Frequency
1000 1μF 5V 100 A) μ LTC1864 10 1 8 VREF VCC 2 7 IN+ SCK 1 ANALOG INPUT 3 6 SERIAL DATA LINK TO 0V TO 5V IN– SDO ASIC, PLD, MPU, DSP SUPPLY CURRENT ( 4 5 OR SHIFT REGISTERS GND CONV 0.1 18645 TA01 0.01 0.01 0.1 1 10 100 1000 SAMPLING FREQUENCY (kHz) 18645 TA02 18645fb 1