Low Noise, 500ksps, 8-Channel, 12-Bit ADC

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 × 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.

Applications

* High Speed Data Acquisition

* Industrial Process Control

* Motor Control

* Accelerometer Measurements

* Battery Operated Instruments

* Isolated and/or Remote Data Acquisition

* 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/MICROWIRE™ Compatible Serial Interface

* Unipolar or Bipolar Input Ranges (Software Selectable)

* Separate Output Supply OVDD (2.7V to 5.25V)

* 24-Pin 4mm × 4mm QFN Package