ENA2040 D

Ordering number : ENA2040

LA4814JA

Monolithic Linear IC

2-Channel Power Amplifier

http://onsemi.com

Overview

The LA4814JA buili-in the power amplifier circuit capable of low-voltage (2.7V and up) operation and has additionally a standby function to reduce the current drain. It is a power amplifier IC optimal for speaker drive used in battery-driven portable equipment and other such products.

Applications

Mini radio cassette players/recorders, portable radios, transceivers and other portable audio devices

Features

• On-chip 2-channel power amplifier

Output power 1 = 350mW typ. (VCC = 5.0V, RL = 4Ω, THD = 10%)

Output power 2 = 150mW typ. (VCC = 3.6V, RL = 4Ω, THD = 10%)

• Enables monaural BTL output system by changing externally connected components

Output power 3 = 700mW typ. (VCC = 5.0V, RL = 8Ω, THD = 10%)

Output power 4 = 320mW typ. (VCC = 3.6V, RL = 8Ω, THD = 10%)

• Low-voltage operation possible

VCC =2.7V and up

• Standby function

Current drain at standby = 0.1

μA typ. (VCC = 5V)

• Voltage gain setting possible

Voltage gain = 3 to 20dB

• Second amplifier stop control function

Reducing the pop noise at startup (in BTL mode)

Semiconductor Components Industries, LLC, 2013

May, 2013

32812 SY 20111215-S00001 No.A2040-1/16

LA4814JA

Specifications

Maximum Ratings

at Ta = 25

°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage

Allowable power dissipation

VCC max

Pd max *

8

1.3

V

W

Maximum junction temperature

Operating temperature

Storage temperature

Tj max

Topr

Tstg

150

-40 to +85

-40 to +150

°C

°C

°C

* Mounted on Our evaluation board : Double-sided board with dimensions of 60mm

× 60mm × 1.6mm

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating

Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability.

Operating Conditions

at Ta

= 25°C

Parameter Symbol

Recommended supply voltage

Recommended load resistance

VCC

RL

Conditions

Single ended mode

BTL mode

Operating supply voltage range VCC op

Ratings Unit

5

4 to 32

8 to 32

V

Ω

Ω

* Determine the supply voltage to be used with due consideration of allowable power dissipation.

Electrical Characteristics

at Ta

= 25°C, VCC = 5.0V, RL = 4Ω, fin = 1kHz

Parameter Symbol

Quiescent current drain

Standby current drain

Maximum output power

BTL maximum output power

Voltage gain

Voltage gain use range

Channel balance

Total harmonic distortion

Output noise voltage

Channel separation

Ripple rejection ratio

Output DC offset voltage

Reference voltage

Pin 8 control HIGH voltage

Pin 8 control LOW voltage

Pin 9 control HIGH voltage

Pin 9 control LOW voltage

ISTBY

POMAX

POMXB

VG

VGU

CHB

THD

VNOUT

CHSEP

SVRR

VOF

VREF

V8H

V8L

V9H

V9L

Conditions

No signal, V8 = Low

THD = 10%

BTL mode, RL = 8Ω, THD = 10%

VIN = -30dBV

VIN = -30dBV

VIN = -30dBV

Rg = 620

Ω, 20 to 20kHz

VOUT = -10dBV, 20 to 20kHz

Rg = 620

Ω, fr = 100Hz, Vr = -20dBV

Rg = 620

Ω, V3-V12, in BTL mode

(Power amplifier operation mode)

(Power amplifier standby mode)

(Second amplifier standby mode)

(Second amplifier operation mode)

Ratings

Unit min typ max

8.6 15

0.1 10 mA

μA

220 350 mW

8.2

700

9.7

3

-2

-70

-30

0

0.35

15

-81

53

0

2.2

11.2

20

2 mW dB dB dB

1 %

50

μVrms dBV

30 dB mV

V

V 1.6

0

1.6

0

VCC

0.3

VCC

0.3

V

V

V

No.A2040-2/16

LA4814JA

Package Dimensions

unit : mm (typ)

3179C

20

6.5

11

(0.33)

1

0.65

Pin Functions

10

0.22

0.15

SANYO : SSOP20(225mil)

Pin Voltage

Pin No. Pin Name

VCC = 5V

1 NC - connect

2 NC - connect

3 NC - connect

4 GND 0 pin

5 NC - connect

6

15

OUT1

OUT2

2.2 Power amplifier output pin

2.0

1.5

1.30

1.0

0.5

0.30

Independent IC

0

-40 -20

Pd max Ta

SANYO evaluation board

(double-sided)

60mm

×60mm×1.6mm

0 20 40 60

Ambient temperature, Ta - C

80

0.68

0.16

100

VCC

VCC

6

15

7 NC - connect

GND

Continued on next page.

No.A2040-3/16

Continued from preceding page.

Pin No. Pin Name

Pin Voltage

VCC = 5V

8

13

IN1

IN2

LA4814JA

8

13

VCC

9 NC - connect

(For connection of capacitor for filter)

10

VCC

11 STBY - pin

Standby mode at 0V to 0.3V

Operation mode at 1.6V to VCC

12 CNT

11

- Second amplifier stop control pin

Second amplifier operation at 0V to 0.3V

Second amplifier stop at 1.6V to VCC

12

14 NC - connect

16 NC - connect

17 VCC 5 Power supply pin

18 NC - connect

19 NC - connect

20 NC - connect

VCC

GND

VCC

GND

GND

GND

No.A2040-4/16

LA4814JA

Block Diagram

20 19

1

Test Circuit

2

18

3

17

4

16 15 14

5

Power AMP-2

-

+

Power AMP-1

+

-

6 7

13

CNT

12 11

STBY

BIAS

VCC

8 9 10

+ out2

+

S4

S2

S1

Power supply

VCC = 5V

20 19 18 17 16 15 14 13 12 11

Power supply

Vsby = 1.5V

1 2 3 4 5 6 7 8 9 10

+

+ out1

S3

Signal source fin = 1kHz

No.A2040-5/16

LA4814JA

Application Circuit Example 1. (2-channel single ended mode)

VCC

+

IN2

20 19 18 17 16

+

15 14 13 12

1 2 3 4 5

+

6 7

IN2

Application Circuit Example 2. (monaural BTL mode)

VCC

+

8 9

20 19 18

17 16 15 14 13

11

10

+

12 11

1 2 3 4 5 6 7 8 9 10

+

IN

No.A2040-6/16

LA4814JA

Cautions for Use

1. Input coupling capacitors (C1, C2)

C1 and C2 are input coupling capacitors that are used to cut DC voltage. However, the input coupling capacitor C1 (C2) and input resistor R1 (R2) make up the high-pass filter, attenuating the bass frequency. Therefore, the capacitance value must be selected with due consideration of the cut-off frequency.

The cut-off frequency is expressed by the following formula :

fc

× R1 × C1 (= 1/2 π × R2 × C2)

Note with care that this capacitance value affects the pop noise at startup. To increase this capacitance value, it is necessary to increase the capacitance value of pin 10 capacitor (C5) to soften the startup characteristics.

2. Pin 10 capacitor (C5)

This capacitor C5 is designed for the ripple filter. Its purpose is to make up a low-pass filter with a 100k

Ω internal resistor for reducing the ripple component of the power supply and improve the ripple rejection ratio.

Inside the IC, the startup characteristics of the pin 10 voltage are used to drive the automatic pop noise reduction circuit, and care must be taken with the pop noise when the C5 capacitance value is to be set lower.

However, when the IC is used in BTL mode, the automatic pop noise reduction function mentioned above has no effect.

Instead, a pop noise reduction method that utilizes the second amplifier control function is used so that the capacitance value must be determined while factoring in the ripple rejection ratio or startup time.

Recommended capacitance value : Min. 22

μF (in 2-channel mode)

10

μF (in mono BTL mode)

3. Bypass capacitor (C7)

The purpose of the bypass capacitor C7 is to reject the high-frequency components that cannot be rejected by the power supply capacitor (chemical capacitor C6). Place the capacitor as near to the IC as possible, and use a ceramic capacitor with excellent high-frequency characteristics.

4. Standby function

The standby function serves to place the IC in standby mode to minimize the current drain. a) When using the standby function (when using microcomputer control)

By applying the following voltages to the standby pin (pin 11), the mode changeover can be performed between standby and operation.

Operation mode … V11

≥ 1.6V

Standby mode … V11

≤ 0.3V

However, set the resistance of resistor R5 inserted in series in such a way that the condition in the following formula is met.

R5

≤ 24.6 × (Vstby - 1.6) kΩ

The pin 11 inrush current is expressed by the following formula:

I11 = (40

× Vstby - 26.3)/(1+0.04 × R5) μA

Vstby

R5

V11

11 STBY

Fig. 1 b) When not using the standby function (microcomputer control is not possible)

By applying a voltage from the power supply (pin 17) to the standby pin (pin 11), the IC can be turned on without the control of the microcomputer when the power is turned on.

In order to reduce the pop noise when the IC is turned off, it is recommended that resistor R5 be inserted as shown in

Fig.2. The resistance value indicated below is recommended for the inserted resistor R5.

VCC = 5.0V : R5 = 82kΩ

VCC = 3.6V : R5 = 47kΩ

VCC = 3.0V : R5 = 33kΩ

VCC

17

VCC

R5

11

STBY

No.A2040-7/16

LA4814JA

5.Second amplifier control function (only when BTL mode is used)

The second amplifier control function is a function to reduce the startup pop-noise in BTL mode. The pop noise can be reduced by first turning on the IC while the second amplifier is stopped, then after the potential inside the IC gets stabilized, turning on the second amplifier.

The values shown below are recommended for the control time.

C5 [

μF] 2.2 3.3 4.7

10

* Twu : Time after releasing standby to second amplifier turn-on a) When using microcomputer control

The second amplifier can be controlled by applying the following voltages to pin 12.

Second amplifier operation mode … V12

≤ 0.3V

Second amplifier stop mode … V12

≥ 1.6V

However, set the resistance value of the resistor R6 inserted in series in such a way that the condition in the following formula is met.

R6

≤ 16.2 × (Vcnt - 1.6) kΩ

The pin 12 injected current is expressed by the following formula :

I12 = (57.6

× Vcnt - 31.7)/(1+0.058 × R6) μA

Vcnt

R6

V12

12 CNT

Fig. 3 b) When microcomputer control is not possible

When the microcomputer cannot be used, the second amplifier can be controlled by adding the external components as shown in Fig. 4.

VCC (V)

5 3.6 3

R7 (k

Ω) 10 6.8 6.8

R9 (k

Ω) 120 68

56

C8 (

μF) 100 100 100

VCC

R7 R9

17

VCC

+

C8

R5

12

11

CNT

STBY

6.Shorting between pins

When power is applied with pins left short-circuited, electrical deterioration or damage may result.

Therefore, check before power application if pins are short-circuited with solder, etc. during mounting of IC.

7.Load shorting

If the load is left short-circuited for a long period of time, electrical deterioration or damage may occur.

Never allow the load to short-circuit.

8.Maximum rating

When IC is used near the maximum rating, there is a possibility that the maximum rating may be exceeded even under the smallest change of conditions, resulting in failure. Take sufficient margin for variation of supply voltage and use IC within a range where the maximum rating will never be exceeded.

No.A2040-8/16

LA4814JA

9. Turn-off transient response characteristics

If the IC is turned off and then turned back on while there is a potential difference between the pin 10 (reference voltage, plus input pin) and pins 8 and 15 (minus input pins), a louder pop noise than the one normally generated when power is switched on will be emitted. Therefore, in order to minimize the turn-on pop noise, smoothen the discharge of the input and output capacitors, and bring the potential of pin 10 and pins 8 and 15 to approximately the same level, then turn on the IC. a) Single ended mode

When the continuous changeover of mode between standby and operation is necessary, it is recommended to insert a resistor between the output pins (pins 6 and 15) and ground to accelerate the turn-off transient response characteristic.

The value shown below is recommended for the resistor used for discharge. In order to reduce pop noise, it is recommended that time necessary for turning the IC back on is greater than the following value.

Recommended discharge resistor : R = 4.7k

Ω

(Recommended turn-on time : T = 600ms)

PWR STBY STBY PWR

100ms/div

OUT1

OUT:50mV/div,AC

6

+

+

-

Vref

10pin:1V/div,DC

8

IN1

T b) BTL mode

When the continuous changeover of mode between standby and operation is performed, it is recommended that the second amplifier control function be used to reduce the turn-on pop noise. If this function is used, the pop noise level can be reduced regardless of the time taken for the IC to turn on after it is turned off.

For details on the time taken for the second amplifier to turn on after the IC is turned on, refer to Section 5 “Second amplifier control function.”

No.A2040-9/16

LA4814JA

General characteristics Single ended mode

10

100

7

10

1

7

0.1

0.01

0.8

0.6

0.4

0.2

0.01

10

1

0.1

8

6

4

2

0

0

5

3

2

7

5

3

2

5

3

2

1

0

7

5

3

2

7

5

3

2

10

RL = OPEN

Rg = 0

Ω

VCC = 5V f = 1kHz

2

VCC = 5V f = 1kHz

2

VCC = 5V

PO = 10mW

Vg = 10.4dB

3

3

2

2 3 5 7

100

ICCO – VCC

4

Supply voltage, VCC – V

THD – PO

RL = 16Ω

R L

= 16

Ω

5 7

0.1

2

Output power, PO – W

Pd – PO

3

RL = 8Ω

5 7

0.1

2

Output power, PO – W

THD – f

3

6

R L

= 8

Ω

R L

= 4

Ω

RL = 4Ω

R L

= 4

Ω

Ω

R L

= 8

Ω

R L

= 16

2 3 5 7

1k

2 3 5 7

10k

Frequency, f – Hz

5

5

7

7

8

1

1

2 3 5 7

100k

100.0

RL = 4Ω f = 1kHz

0.6

0.4

0.2

0

0.01

20

THD – PO

V CC

= 3V

V CC

= 3.6V

V

CC

= 5V

V

CC

= 6V

10.0

7

5

3

2

1.0

7

5

3

2

0.1

0.01

2

1.0

0.9

f = 1kHz

THD = 10%

3 5 7

0.1

2

Output power, PO – W

PO – VCC

3

0.8

5 7

1

0.7

0.6

0.5

R L

= 4

Ω

R L

= 8

Ω

0.4

0.3

0.2

0.1

0

2

1 f = 1kHz

RL = 4Ω

0.8

3 4 5

Supply voltage, VCC – V

Pd – PO

6

V CC

= 6V

R L

= 16

Ω

7

V CC

= 5V

VCC

= 3.6V

VCC = 3V

2 3 5 7

0.1

2

Output power, PO – W

Vg – f

3 5 7

1

10

μF

0

C1 = 1.0

μF

– 10

– 40

10

μF

– 20

C1 = 0.22

– 30

C1 = 0.1

2 3 5 7

100

2 3 5 7

1k

2 3 5 7

10k

Frequency, f – Hz

VCC = 5V

RL = 4Ω

R1 = 10k

Ω

C3 = 470

μF

Vg = 10.4dB

2 3 5 7

100k

No.A2040-10/16

LA4814JA

-40

-

50

-

60

-

70

-

80

-

90

-

100

10

100

90

80

70

60

50

40

30

20

10

0

10

-

70

-

80

-

90

100

-

110

-

40

2 3 5 7

100

-

30

CH.Separation f

-

20

CH1

2

CH2

1

2 3 5 7

1k

2 3 5 7

10k

Frequency, f - Hz

SVRR f

2 3 5 7

100

2 3 5 7 1k 2 3 5 7

10k

Frequency, f - Hz

Mutting attenation VIN

-

10 0

Input voltage, VIN - dBV

General characteristics BTL mode

100

THD PO

7

5

3

2

10

7

5

3

2

V

CC

= 3V

V

CC

= 3.6V

V

CC

= 5V

CC

= 6V

1.0

V

7

5

3

2

0.1

0.01

2 3 5 7

0.1

2 3 5 7

1

Output power, PO - W

2 3 5 7

100k

2 3 5 7

100k

10

2 3 5 7

20

10

20

18

16

14

12

10

8

6

4

2

100

7

7

5

0

2

70

60

50

40

30

20

10

0

-

70

-

80

-

90

-

100

-

110

5

3

2

10

3

2

1

10

1.0

7

5

3

2

0.1

0.01

2

2 3

3

3

2 3 5 7

100

VCC = 5V f = 1kHz

Vg = 16.4dB

5

VNO VCC

4

7

10

5

Supply voltage, VCC - V

SVRR C5

2 3 5 7

1k

2 3 5 7

10k

Frequency, f - Hz

THD PO

2

5 7

0.1

2 3 5 7

1

Output power, PO - W

3

Mutting attenation f

6

5 7

7

100

2 3 5 7

2 3 5 7

10

No.A2040-11/16

LA4814JA

1.00

0.75

PO – VCC

1.50

f = 1kHz

THD = 10%

1.25

0.50

R L

= 6

Ω

R L

= 8

Ω

R L

= 16

Ω

R L

= 32

Ω

0.25

0

2

1.2

f = 1kHz

RL = 8Ω

1

3 4 5

Supply voltage, VCC – V

Pd – PO

6 7

PCA02344

0.8

0.6

= 6V

V CC

V CC

= 5V

0.4

VCC

= 3.6V

0.2

VCC = 3V

0

0.01

2 3

30

28

26

VCC = 5V

RL = 8Ω

Rg = 620

Ω

Din Audio

5 7

0.1

2 3 5 7

1

Output power, PO – W

VNO – VCC

2 3 5 7

10

PCA02346

24

22

20

18

16

14

12

10

2 3

70

60

50

VCC = 5V

RL = 8Ω

Vr = -20dBV

C5 = 10

μF

Rg = 620

Ω

4 5

Supply voltage, VCC – V

SVRR – f

6 7

PCA02348

40

30

20

10

0

10

2 3 5 7

100

2 3 5 7

1k

2 3 5 7

10k

Frequency, f – Hz

2 3 5 7

100k

PCA02350

1

VCC = 5V f = 1kHz

0.8

0.6

0.4

0.2

Pd – PO

R L

= 16

Ω

RL = 32

Ω

Ω

R L

= 6

R L

= 8

Ω

40

30

20

10

0

1

0

1

0.01

7

5

2 3

VCC = 5V

RL = 8Ω

PO = 10mW

5 7

0.1

2 3 5 7

1

Output power, PO – W

THD – f

2 3 5 7

10

PCA02345

3

2

0.1

7

5

3

2

R L

= 6

Ω

Ω

R L

= 8

R L

= 32

Ω

R

L

= 16

Ω

0.01

10

2 3 5 7

100

2 3 5 7

1k

2 3 5 7

10k

Frequency, f – Hz

Vg – f

2 3 5 7

100k

PCA02347

25

20

C1 = 1.0μF

15

10

μF

5

C1 = 0.22

μF

0

– 5

– 10

10

C1 = 0.1

2 3 5 7

100

2 3 5 7

1k

2 3 5 7

10k

Frequency, f – Hz

SVRR – C5

VCC = 5V

RL = 8Ω

VIN = -30dBV

Vg = 16.4dB

Rin = 10k

Ω

2 3 5 7

100k

PCA02349

70

60

50

VCC = 5V

RL = 8Ω

Vr = -20dBV fr = 100Hz

Rg = 620

Ω

2 3 5 7

10

2

Capacitance, C5 –

μF

3 5 7

100

PCA02351

No.A2040-12/16

LA4814JA

-50

-

60

-

70

-

80

Mutting attenation VIN

-

90

-

40

-

10

-

20

30

-

40

9.5

-

30 second amplifier is shut down mode

-

20

-

10

Input voltage, VIN - dBV

Mutting attenation VIN out1-gnd

-

50

-

60

-

70

-

80 out1-out2

-

90

-

40

-

30

-

20

-

10 0

Input voltage, VIN - dBV

Temperature characteristics

10

ICCO Ta

10

9

8.5

8

0

20

7.5

7

10

7

5

3

2

1

7

5

3

2

0.1

50

0 50

Ambient temperature, Ta - C

THD Ta (SE)

0 50

100

100

Ambient temperature, Ta - C

-

50

-

60

-

70

-

80

-

90

10

-

10

-

20

30

-

40

-

50

-

60

-

70

-

80

-

90

10

4

3

2

1

0

10

7

5

3

2

1

7

5

3

2

0.1

2 3 5 7

100 second amplifier is shut down mode

2 3 5 7

1k

2 3 5 7

10k

Frequency, f - Hz

Mutting attenation f

2 3 5 7

100k

2 3 5 7

100

VCC = 5V

Mutting attenation f

VREF Ta out1-gnd out1-out2

2 3 5 7

1k

2 3 5 7

10k

Frequency, f - Hz

0 50

Ambient temperature, Ta - C

THD Ta (BTL)

0 50

Ambient temperature, Ta - C

2 3 5 7

100k

100

100

No.A2040-13/16

1

0.8

VCC = 5V

RL = 4Ω f = 1kHz

THD = 10%

PO – Ta (SE)

0.6

0.4

0.2

0

– 50

15

10

0 50

Ambient temperature, Ta –

°C

Vg – Ta (SE)

VCC = 5V

RL = 4Ω f = 1kHz

Vg = 10.4dB

VIN = -20dBV

5

0

– 5

– 50

0 50

Ambient temperature, Ta –

°C

LA4814JA

1

0.8

0.6

0.4

100

0.2

0

– 50

20

100

15

10

5

0

– 50

PO – Ta (BTL)

0 50

Ambient temperature, Ta –

°C

Vg – Ta (BTL)

VCC = 5V

RL = 8Ω f = 1kHz

THD = 10%

16

0 50

VCC = 5V

RL = 8Ω f = 1kHz

Vg = 16.4dB

VIN = -20dBV

100

Ambient temperature, Ta –

°C

No.A2040-14/16

LA4814JA

Pop noise

Single ended mode : Turn-on transient response characteristic

STBY

PWR

200ms/div

OUT : 50mV/div, AC

10pin : 1V/div, DC

BTL mode: Turn-on transient response characteristic

STBY

PWR

100ms/div

6pin-15pin : 50mV/div, AC

10pin : 1V/div, DC

12pin : 1V/div, DC

Single ended mode : Turn-off transient response characteristic

PWR

STBY

1s/div

OUT : 50mV/div, AC

10pin : 1V/div, DC

BTL mode: Turn-off transient response characteristic

PWR

STBY

500ms/div

6pin-15pin : 50mV/div, AC

10pin : 1V/div, DC

No.A2040-15/16

Evaluation board

1. Double-sided board

Size : 60mm

×60mm×1.6mm

Top Layer

LA4814JA

Bottom Layer

ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

PS No.A2040-16/16

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