• ADR445 Trim Pin Voltage range and design

    Can I get a more detailed schematic/ design description focusing on the TRIM pin and it's interaction with the output?

    I'm looking at driving the TRIM pin with an Op-Amp and would like to get a better understanding of acceptable voltage ranges…

  • 请问ADR445 输出5V-7V的锯齿波是哪里有问题呢

    ADR445用15V的输入,输出是6V多,5-8脚翘起来空载上示波器和放下带载上示波器都是频率稳定在50Mhz的锯齿波。分别试了ADR445BRZ和ADR445ARZ后都是这个问题。

  • ADR445的输出为5.9V左右?

    各位好!我想向大家请教一个ADR445的使用问题。

    我用ADR445做5V的参考基准,它的电路是按照数据手册提供的基本电路画的,输入端两个去耦电容(10uF 和0.1uF),输出端一个0.1uF电容。输入是电池提供的9V(实测8V到9V间),但是输出是5.9V左右,这与标定的5V输出相差太远了我的芯片是申请的样片,两片我都试过,都是这个输出。我也是试过用12V的线性电源,输出也是5.9V左右

    我想请教下大家这是什么原因。


  • 请问ADR445输出怎么是5.9V左右,ADR441输出怎是3.6V左右?

    电路图如附件,我开始用15V的输入,输出是5.9V,换成12V的输入输出还是5.9V左右,只有当出入是5.2V时,输出才是5V,不知道为什么?用ADR441,输出是3.6V左右,而且输入电压越大输出也就越大?ADR445的输出我用示波器测了,尽然是锯齿波?

    另为手上有一个是TI公司的REF102,直插的,输出10V很稳定。

    还请ADI公司工程师能帮解释一下,难道是我的电源文波大的缘故??

  • RE: AD5791 EVM

    1. EVAL-SDP-CB1Z 控制板

    2. EVAL-AD5791SDZ AD5791评估板

    3. EV-ADR445-REFZ, EV-LTZ1000-REFZ, EV-LTC6655-REFZ, 参考基准源根据自己性能需要任选其一。

  • recommended ADC driver, external reference and reference buffer options?

    What are the recommended ADC driver, external reference and reference buffer
    options?

     

    The AD7961 datasheet recommended ADC drivers are the two single-ended op amps
    ADA4899-1 and AD4897-1 or differential amplifier ADA4932-1. The low-noise,
    low-power…

  • RE: EVAL-AD5781 Schematic and Layout Error

    Ah yes, thanks! In that case the layout is correct. Must be something else in my setup. 

    I'm using the EVM without the software. Accessing SPI through J12. Using external controller for SPI master. 

    Powered by external 5V through J11. Using ADR445 reference…

  • RE: AD7787 AIN2 input voltage range

    Hi, 

    For the family of low noise, low drift and high accuracy references you may check this: ADR445, ADR4550.

    But I guess there's also good references with LTC products. I'd suggest ask someone from Voltage References - EngineerZone (analog.com) as…

  • Comment on ADR445 User Trim Model LTSpice

    I found LT1021-5 model in LTSpice with similar functionality to ADR445, although I'm not sure how closely they may be design-wise internally. With this model simulation results are very close to what I measure on the board.