8-Channel, 12-Bit SAR ADC with I2C Interface

The LTC2309 is a low noise, low power, 8-channel, 12-bit successive approximation ADC with an I2C compatible serial interface. This ADC includes an internal reference and a fully differential sample-and-hold circuit to reduce common mode noise. The LTC2309 operates from an internal clock to achieve a fast 1.3μs conversion time.

The LTC2309 operates from a single 5V supply and draws just 300μA at a throughput rate of 1ksps. The ADC enters nap mode when not converting, reducing the power dissipation.

The LTC2309 is available in both a small 24-pin 4mm × 4mm QFN and a 20-pin TSSOP package. The internal 2.5V reference and 8-channel multiplexer further reduce PCB board space requirements.

The low power consumption and small size make the LTC2309 ideal for battery-operated and portable applications, while the 2-wire I2C compatible serial interface makes this ADC a good match for space-constrained systems.

Applications

* Industrial Process Control

* Motor Control

* Accelerometer Measurements

* Battery-Operated Instruments

* Isolated and/or Remote Data Acquisition

* Power Supply Monitoring

* 12-Bit Resolution

* Low Power: 1.5mW at 1ksps, 35μW Sleep Mode

* 14ksps Throughput Rate

* Low Noise: SNR = 73.4dB

* Guaranteed No Missing Codes

* Single 5V Supply

* 2-Wire I2C Compatible Serial Interface with Nine Addresses Plus One Global for Synchronization

* Fast Conversion Time: 1.3μs

* Internal Reference

* Internal 8-Channel Multiplexer

* Internal Conversion Clock

* Unipolar or Bipolar Input Ranges (Software Selectable)

* Guaranteed Operation from –40°C to 125°C (TSSOP Package)

* 24-Pin 4mm × 4mm QFN and 20-Pin TSSOP Packages