The digital attenuator can adjust the signal level of the circuit in 0.25dB steps without interrupting the circuit. It can also be used as the internal attenuator of the instrument to adjust the power level in the test system. High precision, stable and reliable, etc., using OLED display attenuation, the attenuation can be controlled by the host computer.
![](http://ae01.alicdn.com/kf/HTB1g8AdRHrpK1RjSZTEq6AWAVXaw.jpg)
First, technical indicators:
1, working frequency: LF-6GHz 2. Attenuation adjustment range: 0-31.75dB3, attenuation step: 0.25 (dB) 4, insertion loss: ≤ 1.5dB (high frequency end insertion loss will be larger)5, standing wave ratio: ≤1.46. Attenuation accuracy: ±0.25dB Max7. Rated power: ≤1W8. Connector form: SMA (female, outer screw bore)9. Temperature range: -10 ° C ~ +50 ° C (running) -40 ° C ~ +70 ° C (not running)10. Dimensions: 55X40X16.5mm (excluding SMA interface protruding parts, SMA protruding parts 9mm) 11. Weight: 57g 12. Input and output impedance: 50 ohms
![](http://ae01.alicdn.com/kf/HTB1TkwkRNjaK1RjSZFAq6zdLFXav.jpg)
Third, the measured results:
1. S parameter when the attenuation is set to 1DB
![](http://ae01.alicdn.com/kf/HTB1cbEdRPTpK1RjSZKPq6y3UpXa0.jpg)
2. S parameter when the attenuation is set to 2DB
![](http://ae01.alicdn.com/kf/HTB1R_MbRFzqK1RjSZFoq6zfcXXai.jpg)
3. S parameter when the attenuation is set to 5DB
![](http://ae01.alicdn.com/kf/HTB1xiIcRMHqK1RjSZFPq6AwapXaw.jpg)
4. S parameter when the attenuation amount is set to 10DB
![](http://ae01.alicdn.com/kf/HTB1foElRIfpK1RjSZFOq6y6nFXaF.jpg)
5. S parameter when the attenuation is set to 15DB
![](http://ae01.alicdn.com/kf/HTB1ppMmRIfpK1RjSZFOq6y6nFXav.jpg)
6. S parameter when the attenuation is set to 20DB
![](http://ae01.alicdn.com/kf/HTB137gaRQvoK1RjSZPfq6xPKFXaz.jpg)
7. S-parameter when the attenuation is set to 25DB
![](http://ae01.alicdn.com/kf/HTB1vH7dRSzqK1RjSZFpq6ykSXXaG.jpg)
8. S parameter when the attenuation is set to 30DB
![](http://ae01.alicdn.com/kf/HTB1nrgeRQvoK1RjSZFNq6AxMVXaR.jpg)
9. S-parameter when the attenuation is set to 31.75DB
![](http://ae01.alicdn.com/kf/HTB1X2McRFzqK1RjSZFoq6zfcXXap.jpg)
3, serial communication protocol analysis
The overall structure of the digital attenuator ATT-6000 protocol adopts the command line mode. The communication baud rate is 115200bps. The command is issued by the PC, the machine parses and executes, and then the result is returned to the PC. The command is limited to lowercase letters a~z, number 0. ~9, the end symbol of each command is a newline character (hexadecimal notation 0x0a or '/n')Communication commands contain three types of commands: the w commandWv0 command: set the output attenuationThe format is: wv0xxxx + 0x0a, a total of 8 bytes;Where xxxx is the attenuation value represented by 4 digits, such as:Wv01150\n: Indicates that the write attenuation is: 11.5DB (maximum attenuation: 0-3175, step is 25)Converted to hexadecimal: 0X77 0X76 0X30 0X31 0X31 0X35 0X30 0X0a