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 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
Features and Benefits
  • 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
RF & Microwave
Analog to Digital Converters
Data Sheets
Documentnote
AD9874: IF Digitizing Subsystem Data Sheet (Rev. A)PDF 1682 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD9874ABST Production48 ld LQFPOTH 250-40 to 85C17.8115.14Y
AD9874ABSTRL Production48 ld LQFPREEL 2000-40 to 85C015.14Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
AD9864-EBZEvaluation Board/Demo Platform for the AD9864-1Y
AD9874-EBZEvaluation Board/Demo Platform for the AD9874500Y
Reference Materials
AD9874: IF Digitizing Subsystem Data Sheet (Rev. A) ad9874
MS-2735: 最大程度地扩大软件定义无线电 的动态范围 ad9864
MS-2210:高速ADC的电源设计 ad9861
Low-Power IC Digitizes 300 MHz IF ad9874