Features

• 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

Typical Application

Description

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.