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AD9870 Datasheet IF Digitizing Subsystem

Manufacturer: Analog Devices

Overview: a.

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General Description

The AD9870 is a general-purpose IF subsystem that digitizes a low-level 10 MHz–300 MHz IF input with a bandwidth of up to 150 kHz.

The signal chain of the AD9870 consists of a low-noise amplifier, a mixer, a variable gain amplifier with integral antialias filter, a bandpass sigma-delta analog-to-digital converter, and a decimation filter with programmable decimation factor.

An automatic gain control (AGC) circuit provides the AD9870 with 25 dB of continuous gain adjustment.

Key Features

  • 10 MHz.
  • 300 MHz Input Frequency Baseband (I/Q) Digital Output 10 kHz.
  • 150 kHz Output Signal Bandwidth 12 dB SSB NF >.
  • 1 dBm IIP3 (High IIP3 Mode) 25 dB Continuous AGC Range + 16 dB Gain Step Support for LO and Sampling Clock Synthesis Programmable Decimation Rate, Output Format, AAF Cutoff, AGC and Synthesizer Settings 360 ⍀ Input Impedance 2.7 V.
  • 3.6 V Supply Voltage Low Current: 42 mA Typ (High IIP3 Mode), 30 mA Typ (Low IIP3, Fixed Gain Mode) 48-Lead LQFP Package.

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