Overview
Description
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".
Features
- 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
Comparison
Applications
Documentation
Featured Documentation
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| Type | Title | Date |
| Datasheet | PDF 3.77 MB | |
| Guide | PDF 2.24 MB | |
| Guide | PDF 2.83 MB | |
| Report | PDF 517 KB | |
| Product Brief | PDF 1.07 MB | |
| Application Note | PDF 193 KB | |
6 items
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Design & Development
Software & Tools
Boards & Kits
Evaluation
F1978EVBI
Active
Evaluation Board for F1978, 6-bit, 75 Ohm, Digital Step Attenuator
The F1978EVBI is a fully populated evaluation board which allows the customer to easily evaluate the device. Attenuation may be set using either the parallel control input or its serial control input (through external connection and control). A dip switch on the evaluation board allows one to...
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Schematic symbols, PCB footprints, and 3D CAD models from SamacSys can be found by clicking on the CAD Model links in the Product Options table. If a symbol or model isn't available, it can be requested directly from SamacSys.
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News
Mar 2, 2016
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