16-bit, 5 Msps dual SAR ADC with flexible differential inputs

March 03, 2014 // By Graham Prophet
LTC2323-16 is a dual 16-bit 5 Msample/sec simultaneous sampling, successive approximation register (SAR) ADC with flexible differential inputs. The LTC2323-16 supports a wide input common mode range and simplifies system-level design by relaxing the signal conditioning requirements to drive the ADC with a wide range of analogue signals up to Nyquist frequencies.

The LTC2323-16 leads a family of 16-, 14- and 12-bit SAR ADCs, featuring sample rates of 5 Msample/sec and 2 Msample/sec while achieving 81 dB SNR at 16 bits, 80 dB SNR at 14 bits and 73 dB SNR at 12 bits. The 14- and 12-bit versions feature sign plus magnitude transfer functions, suiting them for control loop applications. The LTC2323 family integrates a precision bandgap reference with low drift and guaranteed 20 ppm/°C maximum temperature coefficient into a 20 mm² QFN-28 package. The devices can be powered from a 3.3V or 5V supply and consume just 55 mW with a 3.3V supply and 80 mW with a 5V supply. The high speed SPI-compatible CMOS or LVDS serial interface is suitable for highly integrated high speed systems.

Other features include;

±4LSB INL (Typ)

Guaranteed 16-Bit, No Missing Codes

8VP-P Flexible Differential Inputs with Wide Input Common Mode Range

-85dB THD (Typ) at fIN = 2.2MHz

1.8V to 2.5V I/O Voltages

CMOS or LVDS SPI-Compatible Serial I/O

Power Dissipation 40mW/Ch (Typ)

Small 28-Lead (4mm x 5mm) QFN Package

The LTC2323-16 is available in commercial, industrial and automotive (-40°C to 125°C) temperature grades and pricing begins at $13.95 (1,000). An evaluation board has serial number DC1996A.

Linear Technology; www.linear.com/product/LTC2323-16