The ADS41B29/B49 are members of the ultralow-power ADS4xxx analog-to-digital converter (ADC) family, featuring integrated analog input buffers. These devices use innovative design techniques to achieve high dynamic performance, while consuming extremely low power. The analog input pins have buffers, with benefits of constant performance and input impedance across a wide frequency range. The devices are well-suited for multi-carrier, wide bandwidth communications applications such as PA linearization.

The ADS41B49/29 have features such as digital gain and offset correction. The gain option can be used to improve SFDR performance at lower full-scale input ranges, especially at high input frequencies. The integrated dc offset correction loop can be used to estimate and cancel the ADC offset. At lower sampling rates, the ADC automatically operates at scaled-down power with no loss in performance.

The devices support both double data rate (DDR) low-voltage differential signaling (LVDS) and parallel CMOS digital output interfaces. The low data rate of the DDR LVDS interface (maximum 500MBPS) makes it possible to use low-cost field-programmable gate array (FPGA)-based receivers. The devices have a low-swing LVDS mode that can be used to further reduce the power consumption. The strength of the LVDS output buffers can also be increased to support 50Ω differential termination.

The devices are available in a compact QFN-48 package and are specified over the industrial temperature range (–40°C to +85°C).

• ADS41B49: 14-Bit, 250MSPS ADS41B29: 12-Bit, 250MSPS
• Integrated High-Impedance Analog Input Buffer:
  • Input Capacitance: 2pF
  • 200MHz Input Resistance: 3kΩ
• Maximum Sample Rate: 250MSPS
• Ultralow Power:
  • 1.8V Analog Power: 180mW
  • 3.3V Buffer Power: 96mW
  • I/O Power: 135mW (DDR LVDS)
• High Dynamic Performance:
  • SNR: 69dBFS at 170MHz
  • SFDR: 82.5dBc at 170MHz
• Output Interface:
  • Double Data Rate (DDR) LVDS with Programmable Swing and Strength:
    • Standard Swing: 350mV
    • Low Swing: 200mV
    • Default Strength: 100Ω Termination
    • 2× Strength: 50Ω Termination
  • 1.8V Parallel CMOS Interface Also Supported
• Programmable Gain for SNR/SFDR Trade-Off
• DC Offset Correction
• Supports Low Input Clock Amplitude
• Package: QFN-48 (7mm × 7mm)

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