ANPEC APA4838RI-TR Datasheet

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APA4838

Stereo 2.8W Audio Power Amplifier with DC Volume Control and Selectable Gain

Features

Operating Voltage : 4.5V to 5V

Stereo switchable bridged/single-ended power amplifiers

DC Volume Control Interface , 0dB to –78dB with precision scale

Supply Current , IDD = 15mA at Stereo BTL

Low Shutdown Current , IDD = 0.7µA

Bridge-Tied Load (BTL) or Single-Ended-(SE) Modes Operation

Output Power at 1% THD+N , VDD=5V

2.3W/Ch (typ) into a 3 Ω Load

2.0W/Ch (typ) into a 4 Ω Load

1.2W/Ch (typ) into a 8 Ω Load

Output Power at 10% THD+N , VDD=5V

2.8W/Ch (typ) into a 3 Ω Load

2.3W/Ch (typ) into a 4 Ω Load

1.5W/Ch (typ) into a 8Ω Load

Single-ended mode at 1.0% THD+N

95mW/Ch (typ) into 32Ω Load

General Description

The APA4838 is a monolithic integrated circuit , which provides DC volume control , and a stereo bridged audio power amplifiers capable of producing 2.8W (2.3W) into 3Ω with less than 10% (1.0%) THD+N. APA4838 includes a DC volume control , stereo bridge-tied and single-ended audio power amplifiers , stereo docking outputs , and a selectable gain control , that makes it optimally fittable for notebook PC , multimedia monitors , and other portable applications. The attenuator range of the volume control in APA4838 is from 0dB (DC_Vol=0.8VDD) to –78dB (DC_Vol=0V) with 31 steps. Both of the depop circuitry and the thermal shutdown protection circuitry are integrated in APA4838 , that reduces pops and clicks noise during power up or shutdown mode operation , and protects the chip from being destroyed by over temperature failure. To simplify the audio system design , APA4838 combines a stereo bridgetied loads (BTL) mode for speaker drive and a stereo single-end (SE) mode for headphone drive into a single chip , where both modes are easily switched by the HP Sense input control pin signal. Besides the low supply current design to increase the efficiency of the amplifiers , APA4838 also features a shutdown function which keeps the supply current only 0.7µA (typ).

Depop Circuitry Integrated

Thermal shutdown protection and over current protection circuitry

High supply voltage ripple rejection

PC99 Compliant

28-pin TSSOP-P (with enhanced thermal pad) power package available

Applications

Notebook and Desktop Computers

Multimedia Monitors

Portable Applications

Pin Description

GND

Shutdown

Gain Select

Mode

Mute

VDD

DC Vol

GND

Right Dock

Right In

Beep In

Left In

Left Dock

GND

1

28

2

27

3

26

4

25

5

24

6

23

7

22

8

21

9

20

10

19

11

18

12

17

13

16

14

15

Right Out +

VDD

Right Out -

Right Gain 2

Right Gain 1

GND

BYPASS

HP Sense

GND

Left Gain 1

Left Gain 2

Left Out -

VDD

Left Out +

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders.

Copyright ANPEC Electronics Corp.

1

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

APA4838

Ordering and Marking Information

A P A 4 8 3 8

 

 

 

 

 

P ac ka g e C o de

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R : T S S O P -P

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H and lin g C o de

T em p . R an g e

 

 

 

 

 

 

 

 

 

 

 

 

I : -4 0 to 8 5 °

C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T em p . R an g e

H a nd lin g C o de

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P ac ka ge C od e

T U : T u be

T R : T ap e & R e el

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A P A 48 38 R :

 

 

A P A 48 38

 

X X X X X - D a te C o de

 

 

X X X X X

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Block Diagram

 

 

 

Gain Select

 

20K

20K

 

 

 

Mode

 

Mode

Gain1

Gain2

 

 

 

 

Mute

 

 

 

 

 

 

Control

 

 

 

 

 

Left

Left

 

 

 

 

HP Sense

 

 

20K

0.068µ F

 

 

 

 

 

DC_Vol

 

 

 

10K

10KΩ

 

 

 

 

 

 

 

 

 

 

 

Left Dock

 

 

 

 

 

- Left Out

 

 

 

 

 

 

 

 

 

20KΩ

20KΩ

 

 

 

-

 

 

 

 

 

 

+

 

 

 

Left

Left In

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-

 

20K

20K

 

 

Audio Input

 

 

 

 

 

0.33µ F

 

+

 

 

 

 

 

200K

 

Volume

 

 

 

 

 

 

 

 

 

 

 

Beep In

Beep

 

 

-

 

 

 

Bias

Control

 

 

 

 

 

Detect

 

+ Left Out

 

 

 

 

+

 

200KΩ

 

 

31 steps

 

 

0.33µ F

 

 

 

 

 

 

 

Bias

 

 

 

 

 

+

 

 

 

 

 

Right In

 

 

 

 

 

Right

 

 

 

 

 

 

 

-

 

 

+

 

 

 

 

 

 

+ Right Out

Audio Input 20K

 

 

 

 

 

 

 

 

 

 

Right Dock

 

 

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20K

 

 

 

20K

20K

 

 

 

Shutdown

 

 

 

 

- Right Out

 

 

 

 

 

 

 

VDD

 

 

 

+

 

 

 

 

 

Power

 

-

 

 

 

 

GND

Management

 

10KΩ

10KΩ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20K

 

 

Bypass

Click and Pop

 

 

 

0.068µ F

 

 

Suppression

Right Gain1

Right Gain2

 

 

 

 

 

 

Circuitry

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20K

20K

 

 

Copyright ANPEC Electronics Corp.

2

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

APA4838

Absolute Maximum Ratings

(Over operating free-air temperature range unless otherwise noted.)

Symbol

Parameter

Rating

Unit

VDD

Supply Voltage

-0.3 to 6

V

VIN

Input Voltage Range, HP sense, Shutdown,

-0.3 to VDD+0.3

V

Mute, Mode, Gain Select

 

 

 

 

 

 

 

TA

Operating Ambient Temperature Range

-40 to 85

° C

TJ

Maximum Junction Temperature

Internally Limited*1

° C

TSTG

Storage Temperature Range

-65 to +150

° C

TS

Soldering Temperature,10 seconds

260

° C

VESD

Electrostatic Discharge

-2000 to 2000*2

V

PD

Power Dissipation

Internally Limited

W

Note:

1.APA4838 integrated internal thermal shutdown protection when junction temperature ramp up to 150°C 2.Human body model: C=100pF, R=1500Ω , 3 positives pulse plus 3 negative pulses

3.Machine model: C=200pF, L=0.5µ F, 3 positive pulses plus 3 negative pulses

Recommended Operating Conditions

 

 

Min.

Max.

Unit

 

 

 

 

 

Supply Voltage, VDD

 

4.5

5.5

V

High level threshold voltage, VIH

Shutdown, Mute, Mode, Gain Select

2

 

V

 

 

 

HP Sense

4

 

 

 

 

 

 

 

 

 

Low level threshold voltage, VIL

Shutdown, Mute, Mode, Gain Select

 

1.0

V

 

 

 

HP Sense

 

3

 

 

 

 

 

 

 

 

Common mode input voltage, VICM

 

VDD-1.0

 

V

Thermal Characteristics

Symbol

Parameter

Value

Unit

 

 

 

 

RTHJA

Thermal Resistance from Junction to Ambient in Free Air

 

 

 

TSSOP-P*

45

K/W

 

 

 

 

* 5 in2 printed circuit board with 2oz trace and copper pad through 9 25mil diameter vias. The thermal pad on the TSSOP_P package with solder on the printed circuit board.

Copyright ANPEC Electronics Corp.

3

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

APA4838

Electrical Characteristics

Electrical Characteristics for Entire IC

The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for

TA= 25°C

 

 

 

 

Symbol

Parameter

Test Conditions

 

 

APA4838

 

Unit

 

 

 

 

 

 

Min.

Typ.

 

Max.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

Supply Voltage

 

 

4.5

 

 

5.5

V

IDD

Quiescent Power Supply

VIN=0V, IO=0A

 

 

15

 

25

mA

 

Current

 

 

 

 

 

 

 

 

 

 

 

ISD

Shutdown Current

VPIN 2= VDD

 

 

0.7

 

2.0

µ A

Electrical Characteristics for Volume Attenuators

The following specifications apply for VDD= 5V. Limits apply for TA= 25°C

Symbol

Parameter

Test Conditions

 

APA4838

Unit

Min.

 

Typ.

Max.

 

 

 

 

 

 

 

 

 

 

 

 

 

CRANGE

Attenuator Range

Gain with VPIN 7=5V

 

 

 

±0.5

dB

Attenuation with VPIN 7=0V

-65

 

-78

 

 

 

 

 

 

AM

Mute Attenuation

VPIN 5=5V, Bridged Mode

-70

 

 

 

dB

VPIN 5=5V, Single-Ended Mode

-70

 

 

 

 

 

 

 

 

 

Electrical Characteristics for BTL Mode Operation

The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for TA= 25°C

Symbol

Parameter

Test Conditions

 

APA4838

Unit

 

Typ.

 

 

 

 

 

 

 

 

 

 

 

VOS

Output Offset Voltage

VIN=0V

 

5

mV

PO

Output Power

THD=1%, f=1kHz

 

 

 

 

 

RL=3Ω

 

2.3

W

 

 

RL=4Ω

 

2.0

 

 

 

RL=8Ω

 

1.2

 

 

 

THD=10%, f=1kHz

 

 

 

 

 

RL=8Ω

 

1.5

 

THD+N

Total Harmonic Distortion + Noise

AVD=2, f=1kHz

 

 

 

 

 

RL=4Ω , PO =1.5W

 

0.07

%

 

 

RL=8Ω , PO=1W

 

0.07

 

PSRR

Power Supply Rejection Ratio

VRIPPLE=100mVRms CB=2.2µ

F,

70

dB

RL=8Ω , f=1kHz

 

 

 

 

 

 

XTALK

Channel Separation

CB=2.2µ F, f=1kHz, RL=8Ω

 

90

dB

SNR

Signal-to-Noise Ratio

VDD=5V, PO =1.1W, RL=8Ω

,A-Wtd

95

dB

Filter

 

 

 

 

 

 

VN

Output Noise Voltage

RL=8Ω ,A-Wtd Filter

 

30

µ V

Copyright ANPEC Electronics Corp.

4

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

APA4838

Electrical Characteristics (Cont.)

Electrical Characteristics for SE Mode Operation (Cont.)

The following specifications apply for VDD= 5V unless otherwise noted. Limits apply for TA= 25°C

Symbol

Parameter

 

Test Conditions

APA4838

Unit

 

Typ.

 

 

 

 

 

VOS

Output Offset Voltage

VIN=0V

 

5

mV

PO

Output Power

THD=1%,

f=1kHz, RL=32Ω

95

mW

THD=10%,

f=1kHz, RL=32Ω

110

 

 

THD+N

Total Harmonic Distortion

AV= 1 , VOUT=1VRMS, RL=10kΩ , f=1kHz

0.05

%

plus Noise

PO =75mW, RL=32Ω , AV= 1, f=1kHz

0.07

%

PSRR

Power Supply Rejection

VRIPPLE=100mVRMS , f=120Hz, CB=2.2µ F

52

dB

 

Ratio

 

 

 

 

XTALK

Channel Separation

CB=2.2µ F, RL=8Ω , f=1kHz

90

dB

SNR

Signal-to-Noise Ratio

PO =75mW, RL=32Ω , A-Wtd Filter

102

dB

VN

Output Noise Voltage

RL=32Ω , A-Wtd Filter

20

µ V

Pin Description

Pin

 

I/O

 

Description

 

Name

 

No

 

 

 

 

GND

 

1, 8, 14,

 

Ground connection for circuitry.

 

 

 

20, 23

 

 

 

 

Shutdown

 

2

I

Shutdown mode control signal input, place entire IC in shutdown mode when

 

 

 

 

held high, Idd=0.7uA

 

 

Gain Select

 

3

I

Gain select input pin, logic high will switch the amplifier to external gain

 

 

 

 

mode, and logic low will switch to internal unity gain.

 

Mode

 

4

I

Mode select input pin, fixed gain when logic L and gain adjustable mode

 

 

 

 

when logic H.

 

 

Mute

 

5

I

Mute control input pin, active H.

 

VDD

 

6, 16, 27

 

Supply voltage input pin

 

DC_Vol

 

7

I

Volume control function input pin.

 

Right Dock

 

9

O

Right docking output pin

 

Right In

 

10

I

Right channel audio input pin

 

Beep In

 

11

I

Beep signal input pin

 

 

Left In

 

12

I

Left channel audio input pin

 

Left Dock

 

13

O

Right docking output pin

 

Left Out +

 

15

O

Left channel positive output pin

 

Left Out -

 

17

O

Left channel negative output pin

 

Left Gain 2

 

18

 

Connect pin 2 of the external gain setting resistor for left channel

Left Gain 1

 

19

 

Connect pin 1 of the external gain setting resistor for left channel

HP Sense

 

21

I

Headphone sense control pin

 

 

 

 

 

 

 

 

Copyright ANPEC Electronics Corp.

5

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

 

 

APA4838

Pin Description (Cont.)

Pin

 

I/O

Description

Name

 

No

 

 

Bypass

 

22

 

Bypass pin

Right Gain 1

 

24

 

Connect pin 1 of the external gain setting resistor for right channel

Right Gain 2

 

25

 

Connect pin 2 of the external gain setting resistor for right channel

Right Out -

 

26

O

Right channel negative output pin

Right Out +

 

28

O

Right channel positive output pin

Truth Table for Logic Inputs

Mute

Gain

Mode

HP

Gain Mode of

DC Vol. Control

BTL Output

SE Output

Select

Sense

Power Amplifier

 

 

 

 

 

 

 

 

0

0

0

0

Unity Gain Setting

Fixed Level

Vol. Fixed

-

 

 

 

 

 

 

 

 

0

0

0

1

Unity Gain Setting

Fixed Level

Muted

Vol. Fixed

 

 

 

 

 

 

 

 

0

0

1

0

Unity Gain Setting

Adjustable

Vol. Adjustable

-

 

 

 

 

 

 

 

 

0

0

1

1

Unity Gain Setting

Adjustable

Muted

Vol. Adjustable

 

 

 

 

 

 

 

 

0

1

0

0

External Gain Setting

Fixed Level

Vol. Fixed

-

 

 

 

 

 

 

 

 

0

1

0

1

External Gain Setting

Fixed Level

Muted

Vol. Fixed

 

 

 

 

 

 

 

 

0

1

1

0

External Gain Setting

Adjustable

Vol. Adjustable

-

 

 

 

 

 

 

 

 

0

1

1

1

External Gain Setting

Adjustable

Muted

Vol. Adjustable

 

 

 

 

 

 

 

 

1

X

X

X

-

-

Muted

Muted

 

 

 

 

 

 

 

 

Copyright ANPEC Electronics Corp.

6

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

APA4838

Typical Application Circuit

 

 

 

 

 

 

 

VDD

 

VDD

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

µ

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R_var

 

DC Vol Control

 

 

 

 

 

 

 

 

 

VDD

 

 

 

 

 

 

20KΩ

 

20K

 

 

 

 

 

 

100K

 

 

 

Internal gain select

 

 

 

 

 

 

 

 

 

 

 

 

HP Sense

 

3

 

7

19

 

18

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

To Control Pin on

100KΩ

21

 

 

 

 

 

 

 

 

 

 

 

 

Headphone Jack

 

Mute

5

Mode

 

 

 

 

 

 

20K

 

 

 

 

 

 

 

4

Control

 

 

10K

 

10KΩ

 

0.068µ F

 

 

 

 

 

 

Mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Left Dock

13

 

 

 

 

 

 

 

 

 

 

 

 

Left

 

 

20K

 

 

 

 

 

 

 

 

17

- Left Out

 

 

 

 

 

 

 

 

 

 

 

-

 

+

 

 

 

Audio

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20KΩ

Left In

 

 

 

 

 

 

+

 

 

 

 

 

 

Input

12

 

 

 

 

 

 

 

220µ F

 

 

 

 

 

 

 

 

-

 

 

 

 

 

 

 

Control

Pin

 

 

 

+

 

 

 

 

 

 

20K

20K

 

 

 

 

 

F

 

 

+

 

 

 

 

1K

 

Pin

Ring

 

200KΩ

0.33µ

 

Beep

 

Volume

 

 

 

 

 

 

Beep In

 

 

 

11

 

 

 

 

-

15

 

 

 

 

 

 

 

Bias

 

Control

 

 

+ Left Out

 

 

 

 

 

 

 

Detect

 

 

 

+

 

 

 

 

 

 

 

 

 

 

 

 

31 steps

 

 

 

To HP sense

 

 

 

200KΩ

Right In

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Right

 

 

+

 

 

 

 

 

 

Circuit

 

 

 

 

 

 

 

10

 

 

 

 

Bias

 

 

 

 

 

Audio

 

 

+

 

 

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sleeve

Input

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20KΩ

0.33µ

F

 

 

 

 

 

 

 

+

28

+ Right Out

 

 

 

 

20KΩ

 

 

 

 

 

 

 

 

 

 

 

Tip

 

 

 

9

 

 

 

 

 

 

-

 

 

 

 

 

 

 

Right Dock

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Headphone Jack

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD

 

 

 

 

 

 

 

 

20K

20K

 

- Right Out

 

 

 

 

 

 

6,16,27

 

Power

 

 

 

+

 

26

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-

 

 

+

 

 

 

 

 

 

 

 

 

Management

 

 

 

 

 

 

 

 

 

 

 

1,8,14,20,23

 

 

 

 

 

220µ F

 

 

 

 

 

 

 

 

10K

 

 

 

1KΩ

 

 

 

 

GND

Bypass

 

 

 

 

 

10KΩ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22

 

Click and Pop

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20K

 

 

 

0.1µ F

0.1µ F

0.1µ

F

 

 

 

Suppression

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Circuitry

 

 

 

 

 

 

0.068µ F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2.2µ

F

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

24

 

25

 

 

 

 

 

 

 

 

 

 

 

 

Shutdown

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20KΩ

 

20K

 

 

 

 

 

Copyright ANPEC Electronics Corp.

7

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

APA4838

Application Information

Volume Control Table

Gain (dB)

 

Voltage Range (% of Vdd)

 

Voltage Range (Vdd=5V)

 

Low

 

High

Recommended

Low

 

High

Recommended

 

 

 

 

 

 

 

 

 

0

77.5%

 

100.00%

100.000%

3.875

 

5.000

5.000

 

 

 

 

 

 

 

 

 

-1

75.0%

 

78.5%

76.875%

3.750

 

3.938

3.844

 

 

 

 

 

 

 

 

 

-2

72.5%

 

76.25%

74.375%

3.625

 

3.813

3.719

 

 

 

 

 

 

 

 

 

-3

70.0%

 

73.75%

71.875%

3.500

 

3.688

3.594

 

 

 

 

 

 

 

 

 

-4

67.5%

 

71.25%

69.375%

3.375

 

3.563

3.469

 

 

 

 

 

 

 

 

 

-5

65.0%

 

68.75%

66.875%

3.250

 

3.438

3.344

 

 

 

 

 

 

 

 

 

-6

62.5%

 

66.25%

64.375%

3.125

 

3.313

3.219

 

 

 

 

 

 

 

 

 

-8

60.0%

 

63.75%

61.875%

3.000

 

3.188

3.094

 

 

 

 

 

 

 

 

 

-10

57.5%

 

61.25%

59.375%

2.875

 

3.063

2.969

 

 

 

 

 

 

 

 

 

-12

55.0%

 

58.75%

56.875%

2.750

 

2.938

2.844

 

 

 

 

 

 

 

 

 

-14

52.5%

 

56.25%

54.375%

2.625

 

2.813

2.719

 

 

 

 

 

 

 

 

 

-16

50.0%

 

53.75%

51.875%

2.500

 

2.688

2.594

 

 

 

 

 

 

 

 

 

-18

47.5%

 

51.25%

49.375%

2.375

 

2.563

2.469

 

 

 

 

 

 

 

 

 

-20

45.0%

 

48.75%

46.875%

2.250

 

2.438

2.344

 

 

 

 

 

 

 

 

 

-22

42.5%

 

46.25%

44.375%

2.125

 

2.313

2.219

 

 

 

 

 

 

 

 

 

-24

40.0%

 

43.75%

41.875%

2.000

 

2.188

2.094

 

 

 

 

 

 

 

 

 

-26

37.5%

 

41.25%

39.375%

1.875

 

2.063

1.969

 

 

 

 

 

 

 

 

 

-28

35.0%

 

38.75%

36.875%

1.750

 

1.938

1.844

 

 

 

 

 

 

 

 

 

-30

32.5%

 

36.25%

34.375%

1.625

 

1.813

1.719

 

 

 

 

 

 

 

 

 

-32

30.0%

 

33.75%

31.875%

1.500

 

1.688

1.594

 

 

 

 

 

 

 

 

 

-34

27.5%

 

31.25%

29.375%

1.375

 

1.563

1.469

 

 

 

 

 

 

 

 

 

-36

25.0%

 

28.75%

26.875%

1.250

 

1.438

1.344

 

 

 

 

 

 

 

 

 

-38

22.5%

 

26.25%

24.675%

1.125

 

1.313

1.219

 

 

 

 

 

 

 

 

 

-40

20.0%

 

23.75%

21.875%

1.000

 

1.188

1.094

 

 

 

 

 

 

 

 

 

-42

17.5%

 

21.25%

19.375%

0.875

 

1.063

0.969

 

 

 

 

 

 

 

 

 

-44

15.0%

 

18.75%

16.875%

0.750

 

0.937

0.844

 

 

 

 

 

 

 

 

 

-46

12.5%

 

16.25%

14.375%

0.625

 

0.812

0.719

 

 

 

 

 

 

 

 

 

-48

10.0%

 

13.75%

11.875%

0.500

 

0.687

0.594

 

 

 

 

 

 

 

 

 

-50

7.5%

 

11.25%

9.375%

0.375

 

0.562

0.469

 

 

 

 

 

 

 

 

 

-52

5.0%

 

8.75%

6.875%

0.250

 

0.437

0.344

 

 

 

 

 

 

 

 

 

-78

0.0%

 

6.25%

0.000%

0.000

 

0.312

0.000

 

 

 

 

 

 

 

 

 

Copyright ANPEC Electronics Corp.

8

www.anpec.com.tw

Rev. A.1 - Feb., 2003

 

 

APA4838

Typical Characteristics

THD+N vs. Frequency

 

10

VDD=5V

 

 

 

 

 

 

 

 

RL=3Ω

 

 

 

 

Po=1.8W

 

 

 

 

BTL

 

 

(%)

1

 

Av=2

 

 

 

 

 

 

 

 

THD+N

 

 

Av=4

 

 

 

Av=8

 

0.1

 

 

 

 

 

 

 

 

0.01

 

 

 

 

20

100

1k

20k

Frequency (Hz)

THD+N vs. Frequency

 

10

VDD=5V

 

 

 

 

 

 

 

 

RL=4Ω

 

 

 

 

Po=1.5W

 

 

 

 

BTL

 

 

(%)

1

 

 

 

 

 

 

 

THD+N

 

Av=2

 

 

 

Av=4

 

 

0.1

Av=8

 

 

 

 

 

 

 

0.01

 

 

 

 

20

100

1k

20k

Frequency (Hz)

THD+N vs. Output Power

 

10

VDD=5V

 

 

 

 

 

 

 

 

 

 

RL=3Ω

 

 

 

 

 

Av=2

 

 

 

 

 

BTL

 

 

 

(%)

1

 

 

f=20KHz

 

 

 

 

 

 

THD+N

0.1

 

f=1KHz

 

 

 

 

 

 

 

 

 

 

 

 

 

f=20Hz

 

 

 

 

0.01

 

 

 

 

 

10m

100m

1

3

Output Power (W)

THD+N vs. Output Power

 

10

 

 

 

 

VDD=5V

 

 

 

 

RL=4Ω

 

 

 

 

Av=2

 

 

 

 

BTL

 

 

 

 

1

 

 

 

(%)

f=20KHz

 

 

 

 

 

 

 

THD+N

0.1

 

 

 

f=1KHz

 

 

 

 

 

 

 

 

f=20Hz

 

 

 

 

0.01

 

1

 

 

100m

500m

3

Output Power (W)

Copyright ANPEC Electronics Corp.

9

www.anpec.com.tw

Rev. A.1 - Apr., 2003

 

 

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