AD9271:  Octal LNA/VGA/AAF/ADC and Crosspoint Switch

The AD9271 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amp-lifier (VGA) with low noise preamplifier (LNA); an antialiasing filter ...More

AD9271:  Octal LNA/VGA/AAF/ADC and Crosspoint Switch

Product Description

The AD9271 is designed for low cost, low power, small size, and ease of use. It contains eight channels of a variable gain amp-lifier (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.

Applications

  • Medical imaging/ultrasound
  • Automotive radar

Features

  • 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 mV p-p/333 mV p-p/250 mV p-p
  • Dual-mode active input impedance matching
    Bandwidth (BW) > 70 MHz
    Full-scale (FS) output = 2 V p-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

Diagrams

AD9271 Diagram
Functional Block Diagram for AD9271

Specifications

Resolution (Bits) 12bit
T-Put Rate 50MSPS
# Chan 8
Supply V Single(+1.8)
Pwr Diss 1.5W
Interface LVDS,Ser
Ain Range 0.25 V p-p,0.32 V p-p,0.4 V p-p
SNR (dB) 65.8dB
Pkg Type QFP

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Part# Bits Throughput Rate # of Inputs Operating Pwr Diss
AD9273-50 12 50MSPS 8 1.07W
AD9271-50 12 50MSPS 8 1.1W
AD9222-65 12 65MSPS 8 950mW
AD9212-65 10 65MSPS 8 833mW
AD9252 14 50MSPS 8 773mW
AD9229-65 12 65MSPS 4 1.465W
AD9228-65 12 65MSPS 4 510mW
AD9229-50 12 50MSPS 4 1.083W
AD9627-150 12 150MSPS 2 890mW
AD9627-80 12 80MSPS 2 490mW
AD9238-65 12 65MSPS 2 698mW
Pricing, Packaging & Availability

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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.

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