Part Number: LM4871 Dear Sir Madam,
I really love the devices produced by TI, and I have been sharing them in my website by explaining my visitors regarding the technical aspects of these wonderful devices.
However I am suddenly seeing a massive drop…
Hi Jeff,
the result is that finally PCM5102A export output signal.
(red line is clock, yellow line is output)
so this signal send to LM4871 then LM4871 export output signal to speaker.
but the speaker does not make any sound. (8Ω, 0.25W speaker, supply…
Part Number: LM4871
1. below is the schematic of LM4871. please help us to review it.
2. Issue.
1) Issue 1 :The IC temperature is geting hot and there generator a 2V(600kHz) noise.
2) Issue 2: no 2V(600kHz) noise, but IC is hot.
when change to a new…
Hi,
I am driving the LM4871 from a headphone output. I would assume the impedance of the headphone output is low, e.g. 50-120 ohms.
Should I match the low impedance with the LM4871 design by selecting Ri = Rf = 100 ohms and adapt Ci accordingly?
Do you…
Part Number: LM4871 We are experiencing a turn-on transient with the LM4871 when the STBY pin is driven active, causing a loud *pop* at the speaker. A view of the two output lines shows that they come up approximately 22 msec apart, causing this transient…
Other Parts Discussed in Thread: LM4871 Hi,
There appears to be a discrepancy from the tina reference design here vs the application circuit in the datasheet for the LM4871. The feedback in tina is run back to the non inverting input.
Simulating with tina…
I wanted to get a better idea of the supply current requirements (peak pulse) for this series amp so I set up a TINA sim of these two devices. Supply is 3.3v with an 8 ohm speaker. By varying Rfb as a volume control i could vary the ouput power from 0…
Other Parts Discussed in Thread: LM4890 , LM4889 , LM4871 Hi Jose, Thanks for checking on this. One other question. I was looking at the data sheets for the LM4890 (which has a TINA model) and the LM4889 (which does not) and I can’t see what the difference…
Other Parts Discussed in Thread: LM4871 The LM4871 has a very specific requirement for a 1uF Tantalum capacitor for decoupling the supply nodes. What is the risk in using a ceramic capacitor instead?
Thank you!
