ADS4249 - Dual-Channel, 14-Bit, 250-MSPS Analog-to-Digital Converter (ADC)

The ADS4249 is a member of the ADS42xx ultralow-power family of dual-channel, 12-bit and 14-bit analog-to-digital converters (ADCs). Innovative design techniques are used to achieve high dynamic performance, while consuming extremely low power with a 1.8-V supply. This topology makes the ADS4249 well-suited for multi-carrier, wide-bandwidth communications applications.

The ADS4249 has gain options that can be used to improve SFDR performance at lower full-scale input ranges. This device also includes a dc offset correction loop that can be used to cancel the ADC offset. Both DDR LVDS and parallel CMOS digital output interfaces are available in a compact QFN-64 PowerPAD package.

The device includes internal references while the traditional reference pins and associated decoupling capacitors have been eliminated. The ADS4249 is specified over the industrial temperature range (–40°C to 85°C).

• Maximum Sample Rate: 250 MSPS
• Ultra-Low Power with Single 1.8-V Supply:
  • 560-mW Total Power at 250 MSPS
• High Dynamic Performance:
  • 80-dBc SFDR at 170 MHz
  • 71.7-dBFS SNR at 170 MHz
• Crosstalk: > 90 dB at 185 MHz
• Programmable Gain up to 6 dB for
  SNR/SFDR Trade-off
• DC Offset Correction
• Output Interface Options:
  • 1.8-V Parallel CMOS Interface
  • Double Data Rate (DDR) LVDS with
    Programmable Swing:
    • Standard Swing: 350 mV
    • Low Swing: 200 mV
• Supports Low Input Clock Amplitude
  Down to 200 mV_PP
• Package: 9-mm × 9-mm, 64-Pin Quad Flat No-
  Lead (QFN) Package