This document introduces the features and characteristics of the AD9874 IF Digitizing Subsystem, including input frequency, output signal bandwidth, NF, IIP3, AGC, front-end attenuator, output format, supply voltage, and package.
The AD9874 is a general‑purpose IF subsystem that digitizes a low‑level 10 MHz to 300 MHz IF input with a signal bandwidth of 7.2 kHz to 270 kHz. It integrates a low‑noise amplifier, mixer, band‑pass sigma‑delta ADC, decimation filter and programmable gain and clock synthesizers.
Key features include 8.1 dB single‑sideband noise figure, 0 dBm third‑order input intercept (IIP3), 12 dB continuous AGC range, 48‑lead LQFP package, supply voltage of 2.7 V‑3.6 V and a total current of 20 mA in high‑performance mode. The device operates from –40 °C to +85 °C and supports SPI and SSI digital interfaces.
| Input Frequency Range | 10 MHz to 300 MHz |
|---|---|
| Output Signal Bandwidth | 7.2 kHz to 270 kHz |
| SSB Noise Figure | 8.1 dB |
| IIP3 | 0 dBm |
| Continuous AGC Range | 12 dB |
| Supply Voltage | 2.7 V to 3.6 V |
| Package | 48‑Lead LQFP (1.4 mm thick) |
| Total Current (High Performance) | 20 mA |
| Operating Temperature Range | -40 °C to +85 °C |
| Decimation Factor | 48 to 960 |
The AD9874 accepts an IF input from 10 MHz up to 300 MHz.
The device has an SSB noise figure of 8.1 dB.
It operates from 2.7 V to 3.6 V for its analog and digital supplies.
In high‑performance mode the AD9874 draws 20 mA.