Features

• 12-Bit Resolution
• 500ksps Sampling Rate
• Low Noise: SINAD = 73.3dB
• Guaranteed No Missing Codes
• Single 5V Supply
• Auto-Shutdown Scales Supply Current with Sample Rate
• Low Power:
   17.5mW at 500ksps
   0.9mW Nap Mode
   35µW Sleep Mode
• Internal Reference
• Internal 8-Channel Multiplexer
• Internal Conversion Clock
• SPI/MICROWIRETM Compatible Serial Interface
• Unipolar or Bipolar Input Ranges (Software Selectable)
• Separate Output Supply OV_DD (2.7V to 5.25V)
• 24-Pin 4mm × 4mm QFN Package

Typical Application

Description

The LTC2308 is a low noise, 500ksps, 8-channel, 12-bit ADC with an SPI/MICROWIRE compatible serial interface. This ADC includes an internal reference and a fully differential sample-and-hold circuit to reduce common-mode noise. The internal conversion clock allows the external serial output data clock (SCK) to operate at any frequency up to 40MHz.

The LTC2308 operates from a single 5V supply and draws just 3.5mA at a sample rate of 500ksps. The auto-shutdown feature reduces the supply current to 200µA at a sample rate of 1ksps.

The LTC2308 is packaged in a small 24-pin 4mm x 4mm QFN. The internal 2.5V reference and 8-channel multiplexer further reduce PCB board space requirements.

The low power consumption and small size make the LTC2308 ideal for battery operated and portable applications, while the 4-wire SPI compatible serial interface makes this ADC a good match for isolated or remote data acquisition systems.