Author Topic: Need help identify the component on this PCB.  (Read 555 times)

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Offline BeBuLamarTopic starter

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Need help identify the component on this PCB.
« on: February 02, 2024, 11:07:00 am »
I get this PCB to make use of the Avago APDS-9007 as I can't attach wires o the sensor without a PCB. The PCB convert the current output to volltage which is OK but would like to identfy the components on the PCB.
 

Offline jwet

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Re: Need help identify the component on this PCB.
« Reply #1 on: February 02, 2024, 04:56:21 pm »
That is the ADPS-9007 light sensor if I'm seeing things correctly.  It puts out current and the PCB converts to volts like you thought.  Transimpedance amp.

Am I missing something- are you pointing at something else?  (Also, Broadcom bought this product line and most others from Avago- formerly HP )
 

Offline BeBuLamarTopic starter

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Re: Need help identify the component on this PCB.
« Reply #2 on: February 02, 2024, 10:17:58 pm »
I know the Avago sensor but what are the other compoents. I try to find out the output impedance of the circuit.
 

Offline jwet

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Re: Need help identify the component on this PCB.
« Reply #3 on: February 03, 2024, 12:48:03 am »
Your red circle threw me off. Your picture doesn't have enough resolution to read the back marks or part nos. on the IC's.  Ring it out a bit and maybe draw at least a partial schematic- it will start to make sense.  Its most likely a linear regulator IC and an OP_AMP.  if you can zoom in a bit and get some connectivity/netlist and backmarks, it would help a lot.  That sensor makes a current, you feed its output to a resistor to convert to volts but better a low voltage referenced transimpedance amp.  The output impedance will be quite low- <500 ohm depending on whether they put a resistor in series to make it more rugged for hobbyists.  Ring it out.
 

Offline BeBuLamarTopic starter

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Re: Need help identify the component on this PCB.
« Reply #4 on: February 03, 2024, 10:31:10 pm »
Perhaps this is a little bit better
 

Offline Jwillis

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Re: Need help identify the component on this PCB.
« Reply #5 on: February 03, 2024, 11:18:49 pm »
jwet is correct. It's a  BROADCOM APDS-9007-020
 

Offline BeBuLamarTopic starter

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Re: Need help identify the component on this PCB.
« Reply #6 on: February 03, 2024, 11:55:19 pm »
I need to identify the other components not the light sensor.
 

Offline ArdWar

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Re: Need help identify the component on this PCB.
« Reply #7 on: February 04, 2024, 02:54:32 am »
What do you even need to identify here? The one with 33 marking is obviously a 3v3 regulator, and one with OA marking is an opamp. Both use common standard pinout and I don't think the exact part number matter that much here (within reason). The only thing remotely critical here is the 51k current shunt.
 


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