AD9864 IF Digitizing Subsystem

The AD9864 is a general-purpose IF subsystem that digitizes a low level, 10 MHz to 300 MHz IF input with a signal bandwidth ranging from 6.8 kHz to 270 kHz. The signal chain of the AD9864 consists of a low noise amplifier (LNA), a mixer, a band-pass Σ-∆ analog-to-digital converter (ADC), and a decimation filter with programmable decimation factor. An automatic gain control (AGC) circuit gives the AD9864 12 dB of continuous gain adjustment. Auxiliary blocks include both clock and local oscillator (LO) synthesizers.

The high dynamic range of the AD9864 and inherent antialiasing provided by the band-pass Σ-∆ converter allow the device to cope with blocking signals up to 95 dB stronger than the desired signal. This attribute often reduces the cost of a radio by reducing IF filtering requirements. Also, it enables multimode radios of varying channel bandwidths, allowing the IF filter to be specified for the largest channel bandwidth.

The SPI port programs numerous parameters of the AD9864, 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 AD9864 is available in a 48-lead LFCSP package and operates from a single 2.7 V to 3.6 V supply. The total power consumption is typically 56 mW and a power-down mode is provided via serial interfacing.

Applications

Features and Benefits
  • 10 MHz to 300 MHz input frequency
  • 6.8 kHz to 270 kHz output signal bandwidth
  • 7.5 dB single sideband noise figure (SSB NF)
  • −7.0 dBm input third-order intercept (IIP3)
  • AGC free range up to −34 dBm
  • 12 dB continuous AGC range
  • 16 dB front-end attenuator
  • Baseband I/Q 16-bit (or 24-bit) serial digital output
  • LO and sampling clock synthesizers
  • Programmable decimation factor, output format, AGC, and synthesizer settings
  • 370 Ω input impedance
  • 2.7 V to 3.6 V supply voltage
  • Low current consumption: 17 mA
  • 48-lead LFCSP package
RF & Microwave
Analog to Digital Converters
Data Sheets
Documentnote
AD9864: IF Digitizing Subsystem Data Sheet (Rev. A)PDF 1 M
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD9864BCPZ Production48 ld LFCSP 7x7mm (5.1EP)OTH 260-40 to 85C11.8510.07Y
AD9864BCPZRL Production48 ld LFCSP 7x7mm (5.1EP)REEL 2500-40 to 85C010.07Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
AD9864-EBZEvaluation Board/Demo Platform for the AD9864-1Y
AD9874-EBZEvaluation Board/Demo Platform for the AD9874500Y
Reference Materials
AD9864: IF Digitizing Subsystem Data Sheet (Rev. A) ad9864
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