LTC2301/LTC2305 1-/2-Channel, 12-Bit ADCs with I2C Compatible Interface FEATURESDESCRIPTION n 12-Bit Resolution The LTC®2301/LTC2305 are low noise, low power, n Low Power: 1.5mW at 1ksps, 35μW Sleep Mode 1-/2-channel, 12-bit successive approximation ADCs n 14ksps Throughput Rate with an I2C compatible serial interface. These ADCs include n Internal Reference an internal reference and a fully differential sample-and- n Low Noise: SNR = 73.5dB hold circuit to reduce common mode noise. The LTC2301/ n Guaranteed No Missing Codes LTC2305 operate from an internal clock to achieve a fast n Single 5V Supply 1.3μs conversion time. n 2-wire I2C Compatible Serial Interface with 9 The LTC2301/LTC2305 operate from a single 5V supply Addresses Plus One Global for Synchronization and draw just 300μA at a throughput rate of 1ksps. The n Fast Conversion Time: 1.3μs ADC enters nap mode when not converting, reducing the n 1-Channel (LTC2301) and 2-Channel (LTC2305) power dissipation. Versions n Unipolar or Bipolar Input Ranges (Software The LTC2301/LTC2305 are available in small 12-pin Selectable) 4mm × 3mm DFN and 12-pin MSOP packages. The in- n Internal Conversion Clock ternal 2.5V reference further reduces PCB board space n Guaranteed Operation from –40°C to 125°C requirements. (MSOP Package) The low power consumption and small size make the n 12-Pin 4mm × 3mm DFN and 12-Pin MSOP LTC2301/LTC2305 ideal for battery operated and portable Packages applications, while the 2-wire I2C compatible serial interface makes these ADCs a good match for space-constrained APPLICATIONS systems. n Industrial Process Control 12-Bit I2C ADC Family n Motor Control Input Channels 1 2 8 n Accelerometer Measurements Part Number LTC2301 LTC2305 LTC2309 n Battery Operated Instruments n Isolated and/or Remote Data Acquisition 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. n Power Supply Monitoring BLOCK DIAGRAM 5V Integral Nonlinearity vs Output Code (LTC2305) 10μF 0.1μF 1.00 0.75 LTC2301 VDD AD1 LTC2305 AD0 0.50 CH0(IN+) + 0.25 ANALOG 12-BIT SCL ANALOG INPUT INPUT SAR ADC I2C 0.00 0V TO 4.096V UNIPOLAR CH1(IN+) MUX – PORT ±2.048V BIPOLAR SDA INL (LSB) –0.25 VREF INTERNAL –0.50 2.5V REF 2.2μF –0.75 PIN NAMES IN PARENTHESES REFCOMP –1.00 REFER TO LTC2301 0 1024 2048 3072 4096 GND 0.1μF 10μF 23015 TA01a OUTPUT CODE 23015 TA01b 23015fb 1
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