Hardware Overview
1
Hardware Overview
The TPA3250D2EVM PurePath™ Ultra-HD evaluation module demonstrates the TPA3250D2DDV
integrated circuit from Texas Instruments. The TPA3250D2DDV is a high-performance, high-power, class-
D amplifier that enables true premium sound quality with high efficiency class-D technology. It features an
advance integrated feedback design and high-speed gate driver error correction (PurePath Ultra-HD),
which enables ultra-low distortion across the audio band and superior audio quality. This EVM supports 2
BTL (stereo 2.0) output channels, 1 PBTL (mono 0.1) output channel, 1 BTL plus 2 SE (2.1) output
channels, and 4 SE (4.0) output channel configurations. The NE5532 is a high-performance audio op amp
designed to allow TPA3250D2DDV operation with differential or single-ended input signals to the EVM
with differential inputs yielding the optimal performance. TPA3250D2EVM is a complete 2Vrms analog
input 175 W stereo/350 W mono peak power (90 W Stereo continuous into 8
Ω
) amplifier ready for
evaluation and excellent listening experience.
Figure 1. TPA3250D2EVM
1.1
TPA3250D2EVM Features
The TPA3250D2EVM has following features:
•
Stereo PurePath Ultra-HD evaluation module
•
Self-contained protection system (short circuit, clip, and thermal)
•
Standard 2 V
RMS
differential input or single-ended line input
•
BTL, PBTL, and SE output configuration support
•
Frequency adjust and oscillator sync interface
•
Single supply voltage range 18–38 V
•
Double-sided, plated-through, 2-oz Cu, 4-layer PCB layout
1.2
TPA3250D2EVM Frequency Adjust
The TPA3250D2EVM offers hardware trimmed oscillator frequency by external control of the FREQ_ADJ
pin. The Frequency adjust can be used to reduce interference problems while using a radio receiver tuned
within the AM band, the switching frequency can be changed from nominal to lower values. These values
should be chosen such that the nominal and the lower value switching frequencies together results in the
fewest cases of interference throughout the AM band. The oscillator frequency can be selected by the
value of the FREQ_ADJ resistor connected to GND in master mode according to
2
TPA3250D2EVM
SLVUAM9 – December 2015
Copyright © 2015, Texas Instruments Incorporated
