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Hardware Configuration
NOTE: The SE input settings on the TPA3251EVM must only be used for channels with output
configuration BTL or PBTL, not SE. For SE output configuration, the user must set either
jumper J4 or J19 (or both) for that channel to the DIFF position so that the input signal INx is
mapped directly to OUTx.
3.5
Input Connectors
The TPA3251EVM supports three different input connectors. J3, J14, J15, and J18 are RCA connectors;
J10 and J12 are Molex connectors; and J28 is the AIB connector with J30 being the AIB alignment
connection.
Table 9
Pin
Function
No.
1
Amp Out A
2
Amp Out B
3
PVDD
4
GND
5
NC
6
NC
7
3.3 V
8
3.3 V
9
12 V
10
EN and Reset
11
Analog IN_A
12
NC
13
Analog IN_B
14
CLIP_OTW
15
Analog IN_C
16
FAULT
17
Analog IN_D
18
NC
19
NC
20
NC
21
GND
22
GND
23
NC
24
NC
25
NC
26
NC
27
Amp Out C
28
Amp Out D
12
TPA3251 Evaluation Module
shows the AIB pinout in detail.
Table 9. AIB Connector (J28) Pinout
Speaker-level output from audio class-D EVM (SE or one side of BTL)
Speaker-level output from audio class-D EVM (SE or one side of BTL)
PVDD voltage supply from audio Class-D EVM (variable voltage depending
on Class-D EVM use)
Ground reference between audio plug-in module and audio class-D EVM
3.3-V supply from EVM; used for powering audio plug-in module
3.3-V supply from EVM; used for powering audio plug-in module
12-V supply from EVM; used for powering audio plug-in module
Assert enable and reset control for audio class-D EVM (active low)
Analog audio input A (analog in EVM), Master I
Analog audio input B (analog in EVM), bit clock I
Clipping detection, overtemperature warning, or both from audio class-D EVM
(active low)
Analog audio input C (analog in EVM), frame clock I
Fault detection from audio Class-D EVM (active low)
Analog audio Input D (analog in EVM), data in I
Ground reference between audio plug-in module and audio class-D EVM
Ground reference between audio plug-in module and audio class-D EVM
Speaker-level output from audio class-D EVM (SE or one side of BTL)
Speaker-level output from audio class-D EVM (SE or one side of BTL)
Copyright © 2017, Texas Instruments Incorporated
Description
2
S bus (digital in EVM)
2
S bus (digital in EVM)
2
S bus (digital in EVM)
2
S bus (digital in EVM)
www.ti.com
Audio EVM Input
or Output
O
O
O
O
O
O
I
I
I
O
I
O
I
O
O
SLAU751 – November 2017
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