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F1978 - Digital Step Attenuator

Description

The F1978 Digital Step Attenuator (DSA) is a product in IDT’s Glitch-FreeTM DSA Family, which is optimized for the demanding requirements of CATV and satellite systems.

It operates in the frequency range of 5MHz to 3000MHz.

Features

  • Frequency: 5MHz to 3000MHz.
  • Serial and 6-bit parallel interface.
  • 31.5dB control range.
  • 0.5dB step.
  • Glitch-FreeTM technology, low transient overshoot.
  • 3.0V to 5.25V supply.
  • 1.8V or 3.3V control logic.
  • Attenuator step error: 0.1dB at 1GHz.
  • Low insertion loss: 1.2dB at 1GHz.
  • Ultra-linear IIP3: +64dBm.
  • IIP2: +125dBm typical.
  • Stable integral non-linearity over temperature.
  • Low current consumption: 550µA typical.
  • Bi-directional.

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Datasheet preview – F1978

Datasheet Details

Part number F1978
Manufacturer IDT
File Size 3.68 MB
Description Digital Step Attenuator
Datasheet download datasheet F1978 Datasheet
Additional preview pages of the F1978 datasheet.

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Other Datasheets by IDT
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Full PDF Text Transcription

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6-Bit, 75Ω Digital Step Attenuator 5MHz to 3GHz F1978 Datasheet Description The F1978 Digital Step Attenuator (DSA) is a product in IDT’s Glitch-FreeTM DSA Family, which is optimized for the demanding requirements of CATV and satellite systems. It operates in the frequency range of 5MHz to 3000MHz. This device is offered in a compact 4mm  4mm, 20-pin Thin QFN package with a 75Ω impedance for ease of integration. The F1978 DSA has RF performance identical to the F1975 Digital Step Attenuator. The difference between the F1978 and F1975 is that the F1978 has an additional programming mode called Direct Serial Programming. Consult the “Programming” section of this datasheet or the application note AN-945 “Comparison of F1975 and F1978 Digital Step Attenuator Serial Programming Methods.
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