Audio Solution Guide for Analog TDA

Audio solution guide for analog home systems

www.st.com/audio

March 2009

Audio processors, Class AB and Class D amplifiers

2

Leveraging its long experience in audio devices, STMicroelectronics has a wide analog device portfolio that addresses home stereo and multi-channel audio equipment, such as home cinema systems.

Our large Class D and Class AB portfolio is recognized by customers worldwide as the most complete offering for analog 2.0/2.1 multi-channel systems. High reliability, outstanding audio quality, turnkey solution support and design resources contribute to our leadership as an analog audio solution provider.

This brochure presents a simple selection guide for our analog amplifiers and audio processors to help you choose the solution for your home system.

For more information about ST’s audio processors, Class AB and Class D audio amplifiers, and other ST audio devices, please visit:

www.st.com/audio

or e-mail: [email protected]

Analog audio processorsContents

Class AB audio amplifiers

Class D audio amplifiers

Analog audio amplifiers

Page 6 Page 9

Page 3 Page 5

3

Analog audio processorsAnalog audio processors are designed for controlling more advanced features on home audio systems, such as tone controls, surround mode, voice canceller, input and output multiplexers, bass boost, bass ALC and headphone driving capability.

Data transmission between the main application microprocessor and the audio processor is via a 2-wire I2C bus interface.

Part number Number of stereo

inputsTone control Surround modes

Volume control

Speaker attenuationSupply voltage

min/max [V]

Packages

TDA7430 4 3 3 • 7/10.2 TQFP44

TDA7439DS 4 3 • • 7/10.2 SO28

TDA7439 4 3 • • 6/10.2 SDIP30

TDA7449 2 2 • • 6/10.2 DIP20

TDA7449D 2 2 • • 6/10.2 SO20

TDA7442 4 2 2 • • 7/10.2 SDIP32

TDA7442D 4 2 2 • • 7/10.2 SO28

TDA7469(1) 2 2 • 1.8/5 SSOP24

TDA7468D 4 2 • • 5/10 SO28

TDA7448 6 mono • 4.75/10 SO20

TDA7309 3 • 6/10 DIP20

TDA7309D 3 • 6/10 SO20

(1) TDA7469 also drives a stereo headphone

Analog audio processor main features

4

Figure 1 shows a simple example of a stereo analog solution based on the TDA7469 audio processor with headphone drive, with a TDA7492 (2 x 50 W) analog Class D amplifier. Docking stations can be easily addressed with the proposed solution.

Stereoheadphoneout

TDA7469Audio processor

TDA74922 x 50 Wstereo Class Daudio amplifier

4-channelaudio input(L/R)

ALC

6-input L/Rvolume, treblebass control

Figure 1a. Docking station schema using the TDA7469 audio processor with direct headphone drive and the TDA7492 2 x 50 W high-efficiency Class D audio power amplifier.

IN1-R

ALC

IN2-L

0.47mF

0.47mF

Supply

Supply

Supply

VS

GND CREFTREBLE-LD00AU1234

I2C Bus decoder + latchesSCL

SDA

PVS-L

PGND-L

PGND-R

PVS-R

OUT-L

OUT-R

220mF

22mF

TREBLE-RMUX_R

MUX_L

RB

RB

BASSI-R BASSO-R

x1

x10.47mF

TrebleVolume

Volume

+6dB,0dB

+6dB,-63dB

+6dB¸0dB

3.3nF

+6dB¸-63dB

Treble

Bass

Bass

Bass_alccontrol

Half_waverectifier

25K

25K

VREF

gm

68nF3.3nF 68nF

68nF 68nF

5.6K

5.6K

16 or32

16 or32

220mF

BASSO-LBASSI-L

IN2-R

0.47mF

25K

25K

25K

25K

25K

25Kgm

IN1-L

0.47mF

Figure 1b. TDA7469 technical schematic Figure 1c. TDA7492 technical schematic

5

The largest portfolio in the market

Our analog amplifier portfolio covers applications ranging from compact home mini-hifi units to very substantial home stereo systems. Mono, stereo, multi-channel, Class AB or Class D, our amplifier family offers devices providing just a few watts of output power, to those pumping out more than 100 W per channel. Our product range also offers features such as:n muten standbyn single- and split supplyn variable gainn volume controln BTL (bridge-tied load) and single-ended operationn insertion and SMD packages

Safety first

All our devices offer full short-circuit protection and full thermal protection.

Analog audio amplifiers

Figures 2 to 4 show typical application circuits and internal block diagrams from most of the Class AB amplifiers listed in the table above.

Figure 2. Typical application schematic suitable for TDA7269x, TDA7265x, TDA7499 or TDA7292

+5V

18K15K

IN (L)

1mF

15K 1mFMUTE/ST-BY

GND

IN (R)1mF

4.7

4.7

100nF

100nF

OUT (L)

OUT (R)

1000mF

1000mF

+VS

35

7

9

6

112

4+

+

-

-

D94AU085

RL (L)

RL (R)

-VS

mP560

18K

IN- (L)8

10 IN- (R)

1

560

18K

66

Part number Mono Stereo Output power per

channel [W]

Mute/standbySupply voltage

min/max [V]

Packages

TDA2030AV • 18 ±6 /±22 Pentawatt

TDA7269 • 10 standby ±5/±22 Multiwatt 11

TDA7269A • 14 standby ±5/±22 Multiwatt 11

TDA7269SA • 10 standby ±5/±22 Clipwatt 11

TDA7269ASA • 14 standby ±5/±22 Clipwatt 11



TDA7265A • 25 standby 10/50 Multiwatt 11

TDA7265B • 30 standby ±8/±35 Multiwatt 11


TDA7499SA • 6 standby ±5/±20 Clipwatt 11






STA540 2/3/4 ch (1) standby 8/22 Multiwatt 15

STA540SA 2/3/4 ch (1) standby 8/22 Cipwatt19

TDA7497 3 ch (2) mute 11/30 Multiwatt 15

TDA7497S 3 ch (2) mute 11/30 Multiwatt 15

Class AB audio amplifiersClass AB audio amplifiers offer excellent clarity and signal fidelity. Pure analog, this signal quality is paid for with lower power efficiency, relative to Class D amplifiers. Nevertheless, these reliable components offer a warm, full-bodied tone that guarantees their place in the best audio systems available. The TDA729x is recognized as a preferred solution for systems made with audiophiles in mind.

Class AB audio amplifier main features

(1) STA540: Pout (2 x 26 W, 2 x 12 W + 1 x 26 W, 4 x 12 W)(2) TDA7497: Pout (2 x 10 W + 1 x 18 W) TDA7497S: Pout (2 x 8 W + 1 x 15 W) TDA7497SA: Pout (2 x 8 W + 1 x 15 W)

77

Figure 3. Typical application schematic suitable for TDA7293, TDA7294, TDA7295 or TDA7296

Figure 4. Typical application schematic suitable for TDA7497, TDA7497S

IN- 2R2

680

C222mF

C1 470nFIN+

R1 22K

R62.7

C10100nF

3

R3 22K

-

+

MUTE

STBY

4

VM

VSTBY

10

9

IN+MUTE

MUTE

STBY

R4 22K

THERMALSHUTDOWN

S/CPROTECTION

R5 10K

C3 10mF C4 10mF

1

STBY-GND

C522mF

7 13

14

6

158

-Vs -PWVs

BOOT-STRAP

OUT

+PWVs+Vs

C9 100nF C8 1000mF

-VsD93AU011

+VsC7 100nF C6 1000mF

Note: The Boucherot cell R6, C10, is normally not necessary for a stable operation but could be needed in presence of particular load impedances at VS <±25 V.

OP AMP

+

-

MUTEPROTECTIONS

1

470nF

C1

C110.1mF

C2

C3

C4

INR

30K

OP AMP

+

-30K

C100.1mF

C91000mF

C8 1000mF

C6 1000mF

C71mF

10K R1

10K R2

5

470nF

INL

8S_GND

14

9

10

12

OUTR

MUTE2

MUTE1

OUTL

11PW_GND

470mF

SVR 7

D98AU961B

VS

PW_GND15

13

S1 MUTE2(CENTER)

+5V

+VS

S2 MUTE1(L/R)

+5V

S_GND

60K

C12 1mF

OP AMP

+

-30K 1000mF

C56

470nF

INC 3 OUTC

4PW_GND_C

VS_C

2

8

The flexible solution: STA540/STA540SAThe STA540 is a Class AB audio power amplifier that offers extreme flexibilty. This smart device can be used in the following configurations:

n 4-channel single-endedn 2-channel BTLn 2-channel single-ended + 1-channel BTL

In addition to offering three output configurations, the STA540 is easy to use and only requires an extremely low component count.

Figure 5. Block diagram for the STA540

Figure 6. Three different configurations possible for the STA540

Figure 7. The STA540SA demonstration board for the 2/1 channel configuration

13

1+

-

+

-

+

-

+

-

IN1

VCC2 VCC1

OUT1

4

ST-BY

SVR P-GND S-GND

7

IN25

IN312

IN411

OUT2

OUT3

OUT4

D06AU1630

DIAGNOSTICOUTPUT

2

15

14

10

3

6 8 9

A1

A2 INV

A3

A4 INV

0.22mF

DIAGNOSTICS

2200mF

D04AU1555B

10mF

10K ST-BY

IN1

0.22mF

IN2

0.22mF

IN3

0.22mF

IN4

P-GND S-GND

47mF

1000mF100nF

VS

2200mF

2200mF

2200mF

OUT1

OUT2

OUT3

OUT4

94

5

16

15

8

17 3 1

2

19

18

121110

0.47mF

1

DIAGNOSTICS

49

D95AU1600

10mF

10K ST-BY

IN L

0.47mF

5

16IN R

15

47mF

8

17

1000mF100nF

3

VS

2

18

19

OUT L

10 11 12

OUT R

0.22mF

1

DIAGNOSTICS

49

D05AU1601

10mF

10KST-BY

IN L

0.47mF

5

IN BRIDGE 16

47mF

8

17

1000mF100nF

3

VS

2

18

19

OUT L

10 11 12

OUTBRIDGE

15

0.22mF

IN ROUT R

2200mF

2200mF

9

Class D audio amplifiersClass D audio amplifiers can offer greatly increased efficiency compared to Class AB amplifiers due to their circuit topology. Similar in scheme to a switching regulator, a Class D amplifier pulse width modulates the audio input signal with a higher frequency square wave so that the audio signal becomes the variations in pulse width of this modulated signal.

The frequency of the PWM oscillator is important as it determines both the output filter requirements and the sampling rate for the audio input. In our Class D amplifiers, the best balance between performance and component size is achieved with an oscillator frequency that is at least 10 times the maximum signal frequency (which is typically 20 kHz).

Theoretically, the optimum efficiency for a traditional Class AB linear-amplifier output stage is 78%, but linear amplfiers exhibit this efficiency only at their peak output power – at 0.1 Pout the efficiency drops dramatically below 40%.

The efficiency offered by the output stage of a Class D amplifier – because it uses a pulse-modulated signal to transport the audio signal – can easily reach up to 90%. The low-pass LC filter placed before the speaker is necessary to rebuild the audio signal. In filterless operation, the speakers themselves provide the low-pass filtering necessary to remove the PWM frequency of the signal, leaving just a pure, amplified audio signal.

Other features offered in our portfolio of Class D amplifiers are:

n synchronizationn selectable gainn mute/standbyn differential or single-ended inputsn insertions and SMD packages

Part number Channels Pout Selectable gain (dB) Filterless Differential input VCC Packages

TDA7493 2 2 x 3 W 21.6/27.6/31.1/33.6 • • 3 to 5.5 HTSSOP24

TDA7490 2 2 x 25 W ±10 to ±25 FW25

TDA7490L 2 2 x 18 W ±10 to ±25 FW25

TDA7491LP 2 2 x 5 W 21.6/27.6/31.1/33.6 • • 5 to 12 PSSO36

TDA7491P 2 2 x 10 W 21.6/27.6/31.1/33.6 • • 5 to 18 PSSO36

TDA7491HV 2 2 x 20 W 21.6/27.6/31.1/33.6 • • 5 to 18 PSSO36

TDA7491MV 1 1 x 25 W 21.6/27.6/31.1/33.6 • • 5 to 18 PSSO36

TDA7492 2 2 x 50 W 21.6/27.6/31.1/33.6 • 10 to 26 PSSO36

TDA7492P 2 2 x 25 W 21.6/27.6/31.1/33.6 • 10 to 26 PSSO36

TDA7492MV 2 2 x 50 W 21.6/27.6/31.1/33.6 • 10 to 26 PSSO36

TDA7498H 2 2 x 100 W 21.6/27.6/31.1/33.6 • 10 to 40 PWSO36

Class D audio amplifier main features

10

Figures 8 to 11 show typical application circuits and internal block diagrams from most of the Class D amplifiers listed in the table above.

Figure 8. Typical application schematic for the TDA7493

Figure 9. Application schematic suitable for the TDA7491LP, TDA7491P, TDA7491HV, TDA7492P and TDA7492 (device shown slug down and pin-mirrored)

TDA7493

1

22

23

2

3

10

15

14

11

12

13

21

SVCC

INPL

INNL

ROSC

GAIN0

GAIN1

SYNCLKSYNCLK 20

24

STANDBY

STBY

SVR

SGND

SVR

INPR

INNR

9

8

PGNDPL

PVCCNL

7

6

5

4

16

17

19

18

OUTNL

PGNDNL

PVCCPR

OUTPR

PGNDPR

PGNDNR

OUTNR

PVCCNR

L4 15uH

L3 15uH

330 pF

R320RC11

1 µF

C9 1 µF

10 µF 16 V

C19470 nF

C17

J4

OUT-R+

OUT-R-

(Load = 4 )

2

1

220 nF

C18220 nF

C2220 nF

C3220 nF

C4R130K 100 nF

C16

PVCCPL

OUTPL

C8 1 µF

C10 1 µF

C7 1 µF

C1 1 µF

R7 1 M

R6 1 M

L2 15uH

L1 15uH

330 pF

R220 R

C13470 nF

C14

C20

J3

J1

J5

J6

J8

J9+5 V

The jumper J5

For s ing le end input

J2

+5 V

GND

SMD Type

OUT-L+

L- IN+

L- IN-

OUT-L-

(Load = 4 )

2

2

23

2

1

1

1

1

220 nF

C15220 nF

C12

SVR

C5220 nF

C6220 nF

R9 1 M

R8 1 M

J7

The jumper J6

For s ing le end input

R- IN+

R-IN- 21

11

Figure 10. Typical application schematic for the TDA7491MV

Figure 11. Application schematic suitable for the TDA7490 or TDA7490L

TDA7491M1

22

23

27

26

28

19

18

21

SUB_GND

INP

INN

SGND

VDDS

DIAG

VDDPW

PGND

M UTE

C1 220nF

C2 220nF

INP

INN

C5100nF

C6100nF

R220

R5 33KM UTE

0

3.3V C102.2uF

R1 50K

C3 1nF

C4 1nF

20

25

24

30

31

35

36

STBY

SYNCLK

ROSC

GAIN0

GAIN1

SVCC

VSS

C8 100nF

R439K

C9 100nF

0

3.3V

0

3.3V

C72.2uF

R3 33KSTBY

0

3.3V

GA IN0

GAIN1

32

33

VDDS

SGND

3

2

NA

NA

9

8

NA

NA

7

6

5

4

NA

NA

NA

NA

16

17

14

15

12

13

10

11

OUTP

OUTP

PGND

PGND

PVCC

OUTN

OUTN

PVCC

L1 33uH

L2 33uH

C18 330pF

R620

C17 0.47uF

C19100nF

C15100nF

RL=8

LoadA

C14 2200uF

C16 100nF

34

29

VREF

SVRC11 10uF

C12 10uF

PWM-stage1G=2.5

PREAMPLIFIER1INTEGRATOR1

R21 4.7KC26 470pF C25 470pF

R2068K

R17 52.3K

C232200mF

C22100nF

C212200mF

R4130K

L1 30m

INPUT1

OSC

C19560pF

C2033nF

C18 330pF

C1724pF

C16 330pF

R15100

-VCC

R14 22K

R12 22K

C10220nF

OUT1

PWM-stage2

L2 30m OUT2

C29220nF

R1310K

C15560pF

R11100

-VCC

EXT_CK

G=2.5

PREAMPLIFIER2

C8 470pF

C9 470pFR668K

R5 4.7K

C1433nF

R9 52.3K

+VCC-VCC+VCC

+VCC-VCC

C282200mF

C122200mF

C11100nF

C1 330nF

C21nF

STBYMUTE R230K

C272.2mF

R1 10K

C3100nF

C4100nF

INPUT2

C5 330nF

C61nF

-VCC

-VCC

D98AU978A

7 9 14 2 46

10

12

13

16

1

25

18

19 17 20 24 22

21

23

15

8

11

3

5

INTEGRATOR2

R310K

C7 100nF

R1 10K

R 6.8

Figure 12. Evaluation board for TDA7491P Figure 13. Evalution board for TDA7492P

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Documents

Audio Solution Guide for Analog TDA