ST AN2049 APPLICATION NOTE

AN2049

Application note

Demonstration board user guidelines

for the TS4984 low voltage audio power stereo amplifier

Introduction

This application note applies to the STEVAL-CC003V1 demonstration board, designed to evaluate the low-voltage audio power stereo amplifier TS4984.

The document provides:

■ a description of the demonstration board,

■ the layout of the top and bottom layers.

Key features of the TS4984

■ Low voltage audio power stereo amplifier with active low standby mode

■ Operating range from V

■ 1 W output power at V

■ Ultra-low power consumption in standby mode (10 nA)

■ 62 dB PSRR at 217 Hz with grounded inputs (Av = 2 V/V)

■ Near-zero pop and click

■ Ultra-low distortion (0.1%)

■ Module gain set at 2 V/V

■ Thermal and short-circuit protection

= 2.2 to 5.5 V

= 5 V, THD =1%, F = 1 kHz, with 8 Ω load

August 2009 Doc ID 10901 Rev 4 1/9

www.st.com

Description of the demonstration board AN2049

1 Description of the demonstration board

The STEVAL-CC003V1 is a demonstration board designed for the TS4984 low-power audio stereo amplifier.

The micropackage QFN16 (quad, flat, non-leaded,16 pins) combines space-saving with good thermal dissipation.

The BTL gain is set at 2 V/V for both channels and can be adapted if necessary by modifying the R1 (R8) or R2 (R6) values for the left (right) channels.

The R3 (R6) and C3 (C5) component locations on the board are empty so as to allow you to change both input configurations from single-ended to differential. To set-up the board for use in differential mode, you must modify R4 (R7).

The C1 (C6) component location is also empty so that you can add a low-pass filter if necessary.

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AN2049 Demonstration board connectors

2 Demonstration board connectors

Caution: When you apply the power supply through Cn1, do not invert the polarity since this can

destroy the U1 amplifier.

Connector Description

Cn1 Power connector (V

Cn2 and Cn3 Input signal connector for left channel (GND and active input signal).

Cn5 and Cn6 Input signal connector for right channel (GND and active input signal).

Cn4 Output signal connector for left channel (VO-L and VO+L).

Cn7 Output signal connector for right channel (VO-R and VO+R).

Standby control connector (VCC, Standby, GND). A short-circuit between VCC

Cn8

and standby puts U1 in operation mode. A short-circuit between GND and Standby puts U1 in standby mode.

and GND). Power supply voltage from 2.2 to 5.5 V.

Doc ID 10901 Rev 4 3/9

Demonstration board connectors AN2049

Figure 1. Schematic diagram

Neg. Input L

GND

Pos. Input L

GND

Pos. Input R

GND

Neg. Input R

GND

Cn2

Cn3

Jumper J1

Cn5

Cn6

Cn8

Bias

VCC

100nF

145

VCC1

AV = -1

VO-L

VO+L

VO-R

VO+R

Cn4

Neg. Output L Pos. Output L

Cn7

Neg. Output R Pos. Output R

Vcc

GND

Cn1

VCC

1 2 3

C8 1u

IN-L

IN+L

Standby

Bypass L

IN+R

IN-R

11 Bypass R

GND1

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GND2 VCC26 13

TS4984 QFN16

AN2049 Demonstration board connectors

Table 1. Component list for the STEVAL-CCA003V1

Designation Quantity Description

C1 0 Unconnected, ceramic capacitors, 0603

C2 1 100 nF/16 V, ceramic capacitors, 0603

C3 0 Unconnected, ceramic capacitors, 0603

C4 1 Unconnected, ceramic capacitors, 0603

C5 0 100 nF/16 V, ceramic capacitors, 0603

C6 0 Unconnected, ceramic capacitors, 0603

C7 1 1 μF/50 V, electrolytic capacitor

C8 1 1 μF/50 V, electrolytic capacitor

C9 1 100 nF/16 V, ceramic capacitors, 0603

Cn1 1 2 pins header 2.54 mm pitch

Cn2 1 2 pins header 2.54 mm pitch

Cn3 1 2 pins header 2.54 mm pitch

Cn4 1 2 pins header 2.54 mm pitch

Cn5 1 2 pins header 2.54 mm pitch

Cn6 1 2 pins header 2.54 mm pitch

Cn7 1 2 pins header 2.54 mm pitch

Cn8 1 3 pins header 2.54 mm pitch

J1 1 Jumper, 2.54 mm pitch

R1 1 22 k, 1/16 W 1% resistor, 0603

R2 1 22 k, 1/16 W 1% resistor, 0603

R3 0 Unconnected, 1/16 W 1% resistor, 0603

R4 1 0R, 1/16 W 1% resistor, 0603

R5 0 Unconnected, 1/16 W 1% resistor, 0603

R6 1 22 k, 1/16 W 1% resistor, 0603

R7 1 0R, 1/16 W 1% resistor, 0603

R8 1 22 k, 1/16 W 1% resistor, 0603

U1 1 TS4984IQT (QFN16 package)

Doc ID 10901 Rev 4 5/9

Demonstration board layout AN2049

3 Demonstration board layout

The following schematics show the different layers and top view of the demonstration board.

Figure 2. PCB top layer Figure 3. PCB bottom layer

Figure 4. Top view of demonstration board

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AN2049 Conclusion

4 Conclusion

To order the board online, go to http://www.st.com/stonline/domains/buy/buy_dev.htm, and use the order code STEVAL-CC003V1.

Doc ID 10901 Rev 4 7/9

Revision history AN2049

5 Revision history

Table 2. Document revision history

Date Revision Changes

11-Apr-2004 1 Initial release.

13-Sep-2005 2 PCB figures added.

30-Nov-2006 3 New template.

Updated Introduction on page 1.

31-Aug-2009 4

Updated figures in Chapter 3: Demonstration board layout. Added Chapter 4: Conclusion. Added Chapter 5: Revision history.

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AN2049

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