Features and Benefits

  • 8 channels of LNA, VGA, AAF, and ADC
  • Low noise preamplifier (LNA) 
    Input-referred noise = 1.1 nV/√Hz @ 5 MHz typical, gain = 18 dB 
    SPI-programmable gain = 14 dB/15.6 dB/18 dB 
    Single-ended input; VIN maximum = 400 mVP-P/333 mV p-p/250 mVP-P
    Dual-mode active input impedance matching 
    Bandwidth (BW) > 70 MHz 
    Full-scale (FS) output = 2 VP-P differential
  • Variable gain amplifier (VGA) 
    Gain range = −6 dB to +24 dB 
    Linear-in-dB gain control
  • Antialiasing filter (AAF) 
    3rd-order Butterworth cutoff 
    Programmable from 8 MHz to 18 MHz
  • See Data Sheet for Additional Information

Product Details

The AD9271 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amplifier (VGA) with low noise preamplifier (LNA); an antialiasing filter (AAF); and a 12-bit, 10 MSPS to 50 MSPS analog-to-digital converter (ADC).

Each channel features a variable gain range of 30 dB, a fully differential signal path, an active input preamplifier termination, a maximum gain of up to 40 dB, and an ADC with a conversion rate of up to 50 MSPS. The channel is optimized for dynamic performance and low power in applications where a small package size is critical.

The LNA has a single-ended-to-differential gain that is selectable through the SPI. The LNA input noise is typically 1.2 nV/√Hz, and the combined input-referred noise of the entire channel is 1.4 nV/√Hz at maximum gain. Assuming a 15 MHz noise bandwidth (NBW) and a 15.6 dB LNA gain, the input SNR is roughly 86 dB. In CW Doppler mode, the LNA output drives a transconductance amp that is switched through an 8 × 6 differential crosspoint switch. The switch is programmable through the SPI.


  • Medical imaging/ultrasound
  • Automotive radar

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

Design Tools

Visual Analog

For designers who are selecting or evaluating high speed ADCs, VisualAnalog™ is a software package that combines a powerful set of simulation and data analysis tools with a user-friendly graphical interface.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

PCN-PDN Information

Sample & Buy

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