Part Number: TPA3251
There are three applications (stereo BTL, Single-Ended, and Differential PBTL) in TPA3251 datasheet.
I don't know the connection relationship between a audio jack and INPUT_A/INPUT_B/INPUT_C/INPUT_D in these applications.
What type of output configuration are you targeting?
There are different input connections based on the output connection...
All the best,Carolina
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In reply to Caro Gomez:
I want to understand what the input connection is on these three output configurations.
In reply to Genie Hsu:
The jack is a physical connection port. If you look at the Figure 25 on datasheet, which is a BTL configuration has Left and Right two channels, INPUTA/B, C/D should be a differential input pair.
Depending on your audio source, you have two options,
1. Single end input. One jack is enough, Left is connected to INPUT_A, Right is connected to INPUT_C via an AC cap. INPUT B/D should be connected to GND via an AC cap.
2. Differential input. You need two jacks, one is for LEFT and the other is for RIGHT. L/R on the jack should be connected to INPUT_A/B.
In reply to Sam(MPAA) Zhang:
Question: Can I say that LEFT signal from jacket was output to the upper two speakers (refer to figure 26 on datasheet), and RIGHT signal was output the lower two speakers?
Question: MP3 player or smart phine only has one jacket hole, which device has two jacket holes?
1. No, figure 26 on datasheet is Signle-end configuration which has 4 speakers. In this case, you will need 4 single-end inputs. For this kind of jack, you need two.
2. Because they are not differential input. They share a common "GND".
Question: according to your connection, LEFT signal was output to speaker A, and RIGHT signal was output to speaker C, am I right?
2. Regarding your answer of my question 2, I can't catch your meaning, sorry.
1. No, what you post is a single-end output configuration. It has 4 speakers, so the 4 input should be all used independently.
2. Let me take an example here. For a jack with 3 terminals, L/R/GND, you have two speaker channels, right? Then INPUT_A connected to L, INPUT_C connected to R, INPUT_B and D connected to GND.
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