ST STA333ML Istruzioni per l'installazione e il funzionamento

December 2006 Rev 1 1/42

AN2479

Application note

STA333ML demo board application note

Introduction

The purpose in this document is:

■to describe how to connect the STA333ML demo board,

■how to evaluate the demo board performance with electrical curve data,

■how to avoid critical board and layout issues.

Application note can be configured to the 2.0 channels only. Both of the 2 channels are in

BTL mode. Each channel can deliver 20 W @ THD = 10% when Vcc = 18V and 8 load. It is

a total solution for the digital audio power amplifier in a TV application.

All the test items and graph data in this document are measured by audio precision

equipment. The test data shown in this document contains, for example, output power

versus Vcc, frequency response, THD+N versus frequency, THD+N versus output power,

FFT.

www.st.com

Contents AN2479

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Contents

1 Test condition and connection of demo board . . . . . . . . . . . . . . . . . . . 3

1.1 Test condition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1.1 Jumper, power supply, signal and interface setting . . . . . . . . . . . . . . . . . 3

1.1.2 Output configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Equipment requirement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Connection method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3.1 Speaker jack connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.3.2 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 PCB Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4.1 Top view of PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4.2 Bottom view of PCB layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.5 BOM list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.5.1 Test connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Test curve report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1 Frequency Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2 THD versus frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

2.2.1 THD versus output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.3 FFT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

2.4 Cross talk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

3 Design guideline for PCB schematic and layout . . . . . . . . . . . . . . . . . 28

3.1 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.1.1 Main driver for components selection . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.2 Decoupling capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.2.1 Output filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

3.3 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

AN2479 Test condition and connection of demo board

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1 Test condition and connection of demo board

1.1 Test condition

1.1.1 Jumper, power supply, signal and interface setting

1. JP1: format selection. 0(a) = I2S, 1(a.) = left justified.

2. JP2: oversampling selection. 0 = 256 Fs, 1 = 384 Fs.

3. JP3: gain selection. 0 = 0 dB, 1 = +24 dB.

4. +3.3 V selection. Outer side = external +3.3 V, inner side = internal +3.3 V

5. Connect + voltage of 12 V DC power supply to +Vcc pin and negative to GND.

6. Connect + voltage of 3.3 V DC power supply to +3.3 V pin and negative to GND. If the

+3.3 V selection is set to the inner side, do not connect this wire.

7. Connect GUI AP interface board to the J3 connector of STA333ML demo board.

8. Connect the S/PDIF signal cable to the RCA jack on the interface board, The input

coming from the signal source such as Audio precision or DVD player.

9. The voltage range of the DC power supply for Vcc is from 5 V to 18 V.

1.1.2 Output configuration

STA333ML demo board can be configured to 2.0 channels and do not require software

control. It is not necessary to connect the AP interface to the PC. When the power supply,

signal, interface and output have been setup, push the RESET button which allows the

STA333ML demo board to function.

1.2 Equipment requirement

●Audio Precision (System 2700) by AP Co., USA)

●DC power supply (With 5V to 18V)

●Digital oscilloscope (TDS3034B) by Tektronix

●PC

a. 0: connect to outer side, 1: connect to inner side.

Test condition and connection of demo board AN2479

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1.3 Connection method

Top view of demo board.

Figure 1. Block diagram

1.3.1 Speaker jack connection

Figure 2. Block diagram

External 3.3 V

(not required if +3.3 V

selection is set to internal) Vcc (5-18 V)

+3.3 V

selection

L_CH output

R_CH output

Format

selection

Gain

selection

Oversampling

selection

Connect to

interface board

L_CH outputR_CH output

AN2479 Test condition and connection of demo board

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1.3.2 Schematic

Figure 3. Schematic diagram

1.4 PCB Layout

1.4.1 Top view of PCB layout

Figure 4. Top layout

Test condition and connection of demo board AN2479

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1.4.2 Bottom view of PCB layout

Figure 5. Bottom layout

1.5 BOM list

Table 1. BOM

Item

no. Type Package Description Qty Reference code Manufacturer

1 CCAP CCAP0603 100 n, 50 V, +/- 10 % 18

C1, C2, C3, C4, C6, C7, C11,

C12, C16, C17, C18, C19, C22,

C23, C24, C25, C34, C35

Murata

2 CCAP CCAP0603 1 n, 50 V, +/- 10 % 1 C5 Murata

3 CCAP CCAP0603 4.7 n, 50 V, +/- 10 % 1 C8 Murata

4 CCAP CCAP0603 680 p, 50 V, +/- 5 % 1 C9 Murata

5 CCAP CCAP0603 330 p, 50 V, +/- 10 % 2 C15, C21 Murata

6 CCAP CCAP0603 10 n, 50 V, +/- 10 % 6 C27, C28, C29, C30, C31, C32 Murata

7 CCAP CCAP1206 1 µ, 50 V 2 C13, C14 Murata

8 ECAP D = 10 mm 1000 µ, 25 V 1 C10 Rubycon

9ECAP D=7mm22µ, 16 V 1 C33 Rubycon

10 ECAP D = 5 mm 2.2 µ, 25 V 1 C36 Rubycon

11 Chip bead L0805 600 ohm @ 100 MHz 2 BD1, BD2 Murata

12 CRES R0603 10 k +/- 5 % 2 R1, R3 Murata

13 CRES R0603 0 ohm +/- 5 % 1 R2 Murata

14 CRES R0603 2.2 k +/- 5 % 1 R4 Murata

15 CRES R1206 22 ohm +/- 5 % 2 R5, R8 Murata

16 CRES R1206 6.2 ohm +/- 5 % 4 R6, R7, R9, R10 Murata

AN2479 Test condition and connection of demo board

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1.5.1 Test connection

Figure 6. Block diagram of test equipment

17 Test point Through hole 1 x 5 2.54 mm pitch 1 J2 Any source

18 Connector Through hole 2 x 8 2.54 pitch male

connector 1 J3 Any source

19 Jumper Through hole 1 x 3 2.54 mm pitch 4 JP1, JP2, JP3, JP4 Any source

20 IC Through hole STA333ML 1 U1 ST

21 CAP Through hole 470 n 2 C20, C26

22 Connector Through hole WP4-15 1 J1 Song Cheng

23 Connector Through hole FFKDS/H1-5.08 3 J5, J6, J7 Phoenix

contact

24 Connector Through hole FFKDSA1/H1-7.62 1 J4 Phoenix

contact

25 COIL Through hole 22 µH 4 L1, L2, L3, L4 Kwang Sung

26 Ta c t

switch Through hole 6 x 6 Tact switch 1 SW

Table 1. BOM

Item

no. Type Package Description Qty Reference code Manufacturer

Audio precision equipment

Digital oscilloscope

TDS3034B Tektronix

AP interface

DC power supply

STA333ML

demo board

Output

to AP

S/PDIF

signal

I2S signal

(DC3V3)

From 5 V to 18 V

(DC7V)

7VforLPTB’D

Monitor

Test curve report AN2479

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2 Test curve report

Figure 7. Efficiency versus output power

Condition: R LOAD =8 ohm; VCC=18 V

Figure 8. Output power versus Vcc

Efficiency

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

1 2 3 4 5 6 7 8 9 1011121314151617181920

Output Power (W)

η(%)

Output Power@1%THD vs. Vcc

5 6 7 8 9 10 11 12 13 14 15 16 17 18

Vcc (V)

Output Power (W)

Rl=8 Ohm

Rl=6 Ohm

Rl=4 Ohm

AN2479 Test curve report

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Figure 9. Output power@10% THD vs. supply voltage

2.1 Frequency Response

Figure 10. 18 V 4 ohm 0 dB: Pout = 1 W@ 1 KHz filter: L = 10 uH, C = 1 uF

Output Power@10%THD vs. Vcc

5 6 7 8 9 101112131415161718

Vcc (V)

Output Power (W)

Rl=8 Ohm

Rl=6 Ohm

Rl=4 Ohm

-3

-2

-1

20 20

50 100 200 500 1k 2k 5k 10

Test curve report AN2479

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Figure 11. 18 V 6 Ohm 0 dB: Pout = 1 W @ 1 KHz filter: L = 15 uH, C = 680 nF

Figure 12. 18 V 8 Ohm 0 dB: Pout = 1 W @ 1 KHz filter: L = 22 uH, C = 470 nF

-3

-2

-1

20 20

50 100 200 500 1

-3

-2

-1

50 100 200 500 1k 2k 5k 10k

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