Product Details
- 5MHz to 3000MHz frequency range
- Glitch-Free™ low transient overshoot
- Low insertion loss 1.2dB at 1GHz
- Excellent linearity +64dBm IIP3
- Attenuation step error 0.1dB at 1GHz
- Serial and parallel interface 31.5dB range
- Low spurious design
- 3V/5V supply, 1.8V/3.3V control logic
- Fast settling time
- Class 2 JEDEC ESD (2kV HBM)
- 4mm x 4mm 20-TQFN package
The F1978 Digital Step Attenuator (DSA) featuring Glitch-Free™ technology improves system reliability and settling time. It has an attenuation range of 31.5dB with excellent accuracy and very low distortion and insertion loss. The product supports direct serial mode programming as well as conventional serial programming and parallel programming modes of direct and latched.
The F1978 DSA has identical RF performance as the F1975 DSA. The difference between F1978 and F1975 is that F1978 has an additional programming mode called Direct Serial Programming. Consult the "Programming" section of the F1978 datasheet or application note AN-945 "Comparison of F1975 and F1978 Digital Step Attenuator Serial Programming Methods".
- CATV infrastructure
- CATV set-top boxes
- CATV satellite modems
- Data network equipment
- Fiber networks
Product Documents
Type
Name
Date
Actions
2025-08-25
AN-945 F1975-1978 Serial Programming Methods
2025-08-25
F1978 S-parameters
2025-08-25
PCN# : 220029 Add Alternate Assembly Locations on VFQFPN and LGA Packages
2025-08-25
Digital Step Attenuators
2025-08-25
RF Products Evaluation System (EVS) Digital Control Software
2025-08-25
F1978 Datasheet Revision O
Part Number (2)
F1978NCGK
F1978NCGK8
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