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AD9874:  LOW POWER IF DIGITIZING SUBSYSTEM

The AD9874 is a general purpose IF subsystem that digitizes a low level 10-300MHz IF input signal with a bandwidth of up to 270 kHz. The signal chain of the AD9874 contains a low-noise amplifier, mixer, a band pass sigma-Delta analog-to-digital converter and a decimation filter with programmable decimation factor. An automatic gain control (AGC) circuit provides the AD9874 with 12 dB of continuous ...More

AD9874:  LOW POWER IF DIGITIZING SUBSYSTEM

Product Description

The AD9874 is a general purpose IF subsystem that digitizes a low level 10-300MHz IF input signal with a bandwidth of up to 270 kHz. The signal chain of the AD9874 contains a low-noise amplifier, mixer, a band pass sigma-Delta analog-to-digital converter and a decimation filter with programmable decimation factor. An automatic gain control (AGC) circuit provides the AD9874 with 12 dB of continuous gain adjustment

The high dynamic range and inherent anti-aliasing provided by the bandpass sigma delta converter allows the AD9874 to cope with blocking signals 95 dB stronger than the desired signal. Auxiliary blocks include clock and LO synthesizers in addition to a serial peripheral interface port.

The SPI port programs numerous parameters of the AD9874, thus allowing the device to be optimized for any given application. Programmable parameters include synthesizer divide ratios, AGC attenuation and attack/decay time, received signal strength level, decimation factor, output data format, 16 dB attenuator, and the selected bias currents. The bias currents of the LNA and mixer can be further reduced at the expense of degraded performance for battery-powered applications.

Applications

  • Multimode Narrow-Band Radio Products Analog/Digital UHF/VHF FDMA Receivers TETRA, APCO25, GSM/EDGE
  • Portable and Mobile Radio Products
  • Base Station Applications
  • SATCOM Terminals

RESOURCES & TOOLS

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  • 10-300 MHz Input Frequency
  • Baseband (I/Q) Digital Output
  • 2.7-3.6 Supply Voltage
  • 10-270 KHz Output Signal Bandwidth
  • 8 dB SSB NF
  • +1 dBm IIP3 (typ, max. bias)
  • 95 dB Dynamic Range with 12 dB Continous AGC Range Enabled
  • -18 or -30 dBm max IF Input
    with AGC Disabled
  • LO and Clock Sampling Synthesizers
  • Programmable Decimation Factor,
    Output Format, AGC, and Synthesizer
    settings
  • Resolution (Bits): 24bit
  • T-Put Rate: 541.5kSPS
  • Part #: AD9874
  • Supply V: Single(+3),Single(+3.3)

Functional Block Diagram for AD9874

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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.