AN2474 Datasheet, PDF (1/7 Pages) STMicroelectronics – TS4995 1.2W fully differential audio power amplifier with selectable

AN2474
Application note
TS4995 1.2W fully differential audio power amplifier with selectable
standby and 6db fixed gain - Evaluation board user guidelines
Introduction
This application note describes the DEMO TS4995, an evaluation board specifically
designed for the TS4995 differential audio amplifier. In this document, you will find:
● a brief description of the TS4995 differential audio amplifier,
● a description of the evaluation board,
● a detailed list of evaluation board components,
● the layout of the evaluation board.
About the TS4995
The TS4995 is fully differential structure power audio amplifier which is capable of delivering
1.2W of continuous RMS output power into an 8Ω load at 5V. Due to its differential inputs, it
exhibits outstanding noise immunity.
An external standby mode control reduces the supply current to less than 10nA. A STBY
MODE pin allows the standby to be active High or Low. An internal thermal shutdown
protection is also provided, making the device capable of sustaining short-circuits.
The TS4995 features an internal fixed gain at 6dB which reduces the number of external
components on the application board, and the flip-chip package with 9 bumps allows
maximum space saving.
Its key features are:
● Differential inputs
● 90dB PSRR @ 217Hz with grounded inputs
● Operating range from V_CC = 2.5V to 5.5V
● 1.2W rail to rail output power @ V_CC=5V, THD+N=1%, F=1kHz, with 8Ω load
● 6dB integrated fixed gain
● Ultra-low consumption in standby mode (10nA)
● Selectable standby mode (active low or active high)
● Ultra-fast startup time: 10ms typ. at V_CC=3.3V
● Available in 9-bump flip-chip (300mm bump diameter)
● Ultra-low pop & click
Figure 1 on page 2 shows a typical application for the TS4995 amplifier.
For more detailed information about the TS4995, refer to the datasheet.
January 2007
Rev 1
1/7
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