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Fast 16-bit 5Msps Dual SAR ADC Offers Flexible Differential Inputs with Wide Common Mode Range

Feb 24 2014 - MILPITAS, CA
  • Linear Technology Corporation introduces the LTC2323-16, a dual 16-bit 5Msps 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 analog signals up to Nyquist frequencies.


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


    The LTC2323-16 is available today in commercial, industrial and automotive (–40°C to 125°C) temperature grades. Pricing begins at $13.95 each in 1,000-piece quantities. The DC1996A evaluation board for the LTC2323 SAR ADC family is available at www.linear.com/demo or via a local Linear Technology sales office. For more information, visit www.linear.com/product/LTC2323-16.


    Summary of Features: LTC2323-16


    • 5Msps Throughput Rate
    • ±4LSB INL (Typ)
    • Guaranteed 16-Bit, No Missing Codes
    • 8VP-P Flexible Differential Inputs with Wide Input Common Mode Range
    • 81dB SNR (Typ) at fIN = 2.2MHz
    • -85dB THD (Typ) at fIN = 2.2MHz
    • Guaranteed Operation to 125°C
    • Single 3.3V or 5V Supply
    • Low Drift (20ppm/&deC Max) 2.048V or 4.096V Internal Reference
    • 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 × 5mm) QFN Package

    Dual, 16-Bit, 5Msps, Simultaneous Sampling, Differential Input SAR ADC

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