SPVA068 July   2026 ADC3548 , ADC3549 , ADC3568 , ADC3569 , ADC3648 , ADC3649 , ADC3668 , ADC3669

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2ADC366x Internal Rx Architecture
    1. 2.1 1.4GHz Wideband, High Performance and Low Power Direct RF Sampling
    2. 2.2 Integrated Digital Downconverter (DDC) and 32-Bit NCO
  6. 3 ADC366x Low Latency Mode
  7. 4IFF Pulse Processing Performance
    1. 4.1 ADC3669 Performance in Presence of a High-Power Signal Pulse
    2. 4.2 ADC3669 Performance in Presence of a Weak Signal Pulse
  8. 5Summary - Buying Back Time
  9. 6References

2.1 1.4GHz Wideband, High Performance and Low Power Direct RF Sampling

  • The ADC3669 features a high-performance analog input bandwidth of 1.4GHz allowing for Direct RF Sampling of the 1030MHz and 1090MHz interrogation signal.
  • This can help designers to eliminate analog down-conversion stages including mixers, Local Oscillators & IF filters. Eliminating these analog components, which inherently add delay, helps save on the total turn-around time.
  • Further, the 16-bit core of ADC provides a very high value of SNR and SFDR which helps the systems distinguish weak, distant interrogation from the high-power interferences. (example, busy civilian airports or tactical combat zones.
  • By operating at a highly efficient 300mW per channel at 500MSPS, the ADC3669 stands as one of the most power-efficient ADCs in this class, directly addressing the critical SWaP optimization constraints required for modern airborne systems.
FFT Output of ADC3669 at Fin = 1090MHz Figure 2-1 FFT Output of ADC3669 at Fin = 1090MHz