• 有关ADPD105、106、107芯片使用问题求教

    这两天看到了ADPD105系列芯片,看到这个完整的前端基本上和我们现在项目上用到的情况很接近,如果应用这个芯片的话,能够大幅降低PCB尺寸。但是现在有几个疑问想请教一下,

    1、LED电流是如何控制的。在芯片手册里面,看到能够用编程方式控制脉冲高低、宽窄和数量,最后用到的是一个平均电流的概念,并用电容处理,这样做的话,LED灯的亮度是不是不是恒定的,而是在某个范围内闪烁的?

    2、采样点如何确定。因为LED灯是闪烁的,那如何保证采样时的采样点能够在每个波形的同一个位置处?如果LED灯的重复性不好的话…

  • ADPD105 TIA ADC mode ,ADC output code rang is small

    I have an EVAL-ADPD105Z-GEN kit with me.

    I would like to use the TIA ADC MODE of the ADPD105 with the input to the trans-impedance amplifier as a sine wave.

     

    The connections that I made are:

    --> Function generator positive to PD2 pin with a 51 kilo…

  • ADPD105: Band-Pass Filter Corner Frequencies

    Hi,

    The ADPD105 datasheet mentions that there is an internal band-pass filter in the analog block, but makes no mention of the corner frequencies of the filter (or maybe I overlooked that information). Would someone inform me of the characteristics of…

  • ADPD105 minimal LED current

    Based on the document: 
    http://www.analog.com/media/en/technical-documentation/data-sheets/ADPD105-107.pdf (page 45) the equation for LED current setting is:
    LED3PEAK = LED3COARSE × LED3FINE × LED3SCALE

    where:
    LED3PEAK is the LEDX3 peak target value (mA)…

  • ADPD105 Gerber file

    Hi,

    Is there any gerber available for ADPD105?

    Thank you

  • ADPD105 TIA ADC mode configuration

    Greetings.

    I have an EVAL-ADPD105Z-GEN kit with me.

    I have tested and obtained a fairly noise-free PPG from the EVAL board. However, I would like to use the TIA ADC MODE of the ADPD105 with the input to the trans-impedance amplifier as a sine wave.

  • Connecting an external MCU to ADPD105 Eval Board

    Hi, 

    I’m testing a recently acquired ADPD105 eval Board. My goal is to connect an external MCU to the ADPD105 and build a prototype. I was wondering if there is any potential problem with connecting the four communication pins SCL SDA and 2 GPIO pins…

  • How can we have the accurate signal from the eval-board ADPD105 ?

    Hi,

     

    We are working on a project using the ADPD105 optical sensor to measure PPG (heart rate and SpO2 values). We are using the evaluation board of the ADPD105. Now we are trying to have the accurate signal out of the evaluation board but every time…

  • How to verify the ADC value is currect or not?(ADPD105/108)

    as title ,
    Just like g-sensor will define a tolerance to verify the chip.
    if I set LED1 current is 30 mA,
    How to verify the ADC value I get is correct ?(in darkroom or other situation)

  • ADPD105 -- GPIO Pins Input Levels

    In the datasheet of ADPD105, there are some conflicted information I want to ask about.

    If you check Table.5 at page 9, GPIO pins input level can go as high as 3.6V. However, If you check Table.8 at page 12 and the first paragraph at page 30, it is stated…