PE4302 RF Attenuator

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RF Atten-Front-01.jpg

RF Atten-Rear-01.jpg

Features

  • PE4302 RF attenuator module
  • Parallel immediate mode
  • Program control gain attenuation range is from 0 to 31.5dB
  • Bandwidth 1MHz to 4GHz

Specifications

  • Power Supply Voltage
    • 2.7-3.3 VDC - 3V typical
    • Typical current 5mA
  • Program control gain attenuation range
    • 0~31.5DB
    • 10K pull down resistors to ground
    • Step size: 0.5DB
  • Input/Output Impedance
    • 50 ohm
  • Bandwidth
    • 1MHz~4GHz
    • Attenuation value will differ under different frequency
  • Max Input power (50Ω) +30 dBm
    • 1W = 7.1V RMS
  • Connectors
    • SMA-female

My Design

  • A lot of designs use Arduino/OLED, etc to control the card - unnecessary
    • Could add noise from OLED
    • Doesn't need to switch too often
  • Mount in small project box
  • Bulkhead SMA connectors
  • Mini360 Adapter Board for wide input voltage range
    • 4.75-23V input
    • 3V output
    • Concern over EMI?
  • Use SWLEDX8 to control attenuation selection
    • Use SW1-SW6 switches (centered horizontally on card)
  • Use D6 for power indication
    • Digital Input High 0.7xVDD in V = 2.1V
    • Using 1.5K pullup to counter the 10K pulldowns on the card = 2.6V
    • 3V / 1.5K = 2 mA
    • Adds to current 2 mA x 6 = 12 mA when all switches are low

SWLEDX8-I2C-P118-720px.jpg

References