ANPEC APA4838RI-TR Datasheet

APA4838

Stereo 2.8W Audio Power Amplifier with DC Volume Control

and Selectable Gain

Features General Description

• 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 , I

• Low Shutdown Current , I

= 15mA at Stereo BTL

DD

= 0.7µA

DD

• Bridge-Tied Load (BTL) or Single-Ended-(SE)

Modes Operation

• Output Power at 1% THD+N , V

DD

=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 , V

DD

=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

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

Pin Description

GND

Shutdown

Gain S e lec t

Mode

Mute

V

DC Vol

GND

Right Dock

Righ t In Beep In

Left In

Left D o c k

GND

DD

1 2

3 4 5 6 7

8

9 10 11 12 13 14

28 27 26 25 24 23 22 21 20 19 18 17 16 15

Righ t O ut + V

DD

Righ t O ut Righ t G ain 2

Righ t G ain 1 GND BYPASS HP Sense GND Left G a in 1

Left G a in 2 Left O u t -

V

DD

Left O u t +

• Portable Applications

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. Rev. A.1 - Apr., 2003

www.anpec.com.tw1

APA4838

Ordering and Marking Information

APA4838

APA4838 R :

Block Diagram

Mode

Mute

HP Sense

DC_V ol

Left Dock

Ω

20K

Ω

20K Left Audio Input

Right Audio Input

200K

20K

Ω

0.33

µ

F

µ

F

Right Dock

APA4838 XXXXX

Left In

Beep In

Rig h t In

Handling Code Temp. Range Package Code

Ga in Selec t

Mode

Control

Beep

Detect

+

Bias +

-

Package Code R : T S S O P-P Temp. Range I : -40 to 8 5 C Handling Code TU : T u be T R : T ap e & Ree l

XXXXX - Date Code

Left Gain1

10K

20K

Ω

°

Ω

Left Gain2

10K

+

20K

Ω

20K

Volume Control

+

31 steps

Bias

+

-

20K

Ω

20K

0.068µF

- Left Out

Ω

+ Left Out

+ Right Out

Ω

20K

Shutdown

V

DD

GND

Bypass

Copyright  ANPEC Electronics Corp. Rev. A.1 - Apr., 2003

Power

Managem ent

Click and Pop

Suppression

Circuitry

20K

+

- Right O u t

Ω

20K

Ω

-

Ω

10K

Ω

20K

0.068µF

Right Gain1

20K

Right Gain2

Ω

20K

Ω

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APA4838

Absolute Maximum Ratings

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

Symbol Parameter Rating Unit

V

DD

V

IN

T

A

T

J

T

STG

T

S

V

ESD

P

D

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=0.5µF, 3 positive pulses plus 3 negative pulses

Supply Voltage -0.3 to 6 V Input Voltage Range, HP sense, Shutdown,

Mute, Mode, Gain Select

-0.3 to V

+0.3 V

DD

Operating Ambient Temperature Range -40 to 85 Maximum Junction Temperature Internally Limited* Storage Temperature Range -65 to +150 Soldering Temperature,10 seconds 260 Electrostatic Discharge -2000 to 2000*

2

Power Dissipation Internally Limited W

C

°

1

C

°

C

°

C

°

V

Recommended Operating Conditions

Min. Max. Unit

Supply Voltage, V

DD

High level threshold voltage, V

Low level threshold voltage, V Common mode input voltage, V

IH

HP Sense 4 Shutdown, Mute, Mode, Gain Select 1.0

Shutdown, Mute, Mode, Gain Select 2

IL

ICM

HP Sense 3

4.5 5.5 V

VDD-1.0 V

Thermal Characteristics

Symbol Parameter Value Unit

R

THJA

* 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.

Thermal Resistance from Junction to Ambient in Free Air

TSSOP-P* 45 K/W

V

Copyright  ANPEC Electronics Corp. Rev. A.1 - Apr., 2003

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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

V

I I

Supply Voltage 4.5 5.5 V

DD

Quiescent Power Supply

DD

Current Shutdown Curre nt V

SD

V

=0V, IO=0A 15 25 mA

IN

= V

PIN 2

DD

Electrical Characteristics for Volume Attenuators

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

Symbol Parameter Test Conditions

C

RANGE

A

M

Attenuator Range

Mute Attenuation

Gain with V Attenuation with V V

=5V, Bridged Mode -70

PIN 5

V

=5V, Single-Ended Mode -70

PIN 5

=5V ±0.5

PIN 7

=0V -65 -78

Min. T yp. Max.

Min. Typ. Max.

APA4838

0.7 2.0

APA4838

Unit

A

µ

Unit

dB

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

V

OS

P

Output Offset Voltage VIN=0V 5 mV

O

Output Power

THD=1%, f=1kHz

=3

R

Ω

L

R

=4

Ω

L

R

=8

Ω

L

THD=10%, f=1kHz

=8

R

Ω

L

THD+N Total Harmonic Distortion + Noise AVD=2, f=1kHz

R

=4Ω , PO =1.5W

L

R

=8Ω , PO=1W

L

V

PSRR Power Supply Rejection Ratio

X

TALK

Channel Separation

SNR Signal-to-Noise Ratio

V

Output Noise Voltage

N

=100mV

RIPPLE

=8Ω, f=1kHz

R

L

=2.2µF, f=1kHz, RL=8

C

B

=5V, PO =1.1W, RL=8Ω,A-Wtd

V

DD

Filter

=8Ω,A-Wtd Filter

R

L

Rms CB

=2.2µF,

Ω

APA4838

Typ.

2.3

2.0

1.2

1.5

0.07

0.07 70 dB 90 dB 95 dB 30

Unit

W

%

V

µ

Copyright  ANPEC Electronics Corp. Rev. A.1 - Apr., 2003

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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

V

THD+N

PSRR

X SNR Signal-to-Noise Ratio

Output Offset Voltage VIN=0V 5 mV

OS

P

Output Power

O

Total Harmonic Distortio n plus Noise

Power Supply Rej ec tio n Ratio

Channel Separation

TALK

V

Output Noise Voltage

N

THD=1%, f=1kHz, THD=10%, f=1kHz,

AV= 1 , V P

=75mW, RL=32Ω, AV= 1, f=1kHz

O

V

RIPPLE

C

=2.2µF, RL=8Ω , f=1kHz

B

P

=75mW, RL=32Ω, A-Wtd Filter

O

=32Ω, A-Wtd Filter

R

L

=1V

OUT

=100mV

RMS

R

=32

L

R

=32

L

, RL=10kΩ, f=1kHz

, f=120Hz, CB=2.2µF

Ω Ω

APA4838

Typ.

95

110

0.05 %

0.07 % 52 dB

90 dB

102 dB

20

Unit

mW

V

µ

Pin Description

Name No

GND 1, 8, 14,

20, 23

Shutdown 2 I Shutdown mode control signal input, place entire IC in shutdown mode when

Gain Select 3 I Gain select input pin, logic high will switch the amplifier to external gain

Mode 4 I Mode select input pin, fixed gain when logic L and gain adjustable mode

Mute 5 I Mute control input pin, active H. V

DD

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

I/O Description

Ground connection for circuitry.

held high, Idd=0.7uA

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

when logic H.

Copyright  ANPEC Electronics Corp. Rev. A.1 - Apr., 2003

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APA4838

Pin Description (Cont.)

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

Select

0000Unity Gain SettingFixed LevelVol. Fixed -

0001Unity Gain SettingFixed Level Muted Vol. Fixed

0010Unity Gain SettingAdjustableVol. Adjustable -

0011Unity Gain SettingAdjustable MutedVol. Adjustable

Mode

HP

Sense

Gain Mode of

Power Amplifier

DC Vol. Control BTL Output SE Output

0100External Gain SettingFixed LevelVol. Fixed -

0101External Gain SettingFixed Level Muted Vol. Fixed

0110External Gain SettingAdjustableVol. Adjustable -

0111External Gain SettingAdjustable MutedVol. Adjustable

1 X X X - - Muted Muted

Copyright  ANPEC Electronics Corp. Rev. A.1 - Apr., 2003

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APA4838

Typical Application Circuit

To Control P in on

Headphone Ja c k

Left

Audio

Input

Beep In

Right

Audio

Input

20K

200K

20K

100K

Ω

V

DD

Ω

Left Dock

Left In

0.33

Right In

0.33

Right Dock

V

DD

1,8,14,20,23

GND

µ

F0.1µF0.1µF

0.1

100K

Mute

Mode

20K

+

µ

F

+

µ

F

20K

6,16,27

Bypass

HP Sense

Ω

21

5 4

13

Ω

12

11

10

Ω

9

22

2.2µ

F

R_var

Internal g a in sel ec t

Mode

Control

Beep

Detect

Power

Management

Click and P op

Suppression

Circuitry

V

DD

V

DD

1 µ

F

DC Vol Control

Ω

Bias

20K

18

Ω

20K

Ω

10K

- Left Out

17

Ω

20K

-

15

+

+ Left Out

+ 220µF

To HP sense

0.068µF

Ω

1K

Control

Ring

Circuit

+

-

+ Right Out

28

Tip

Sleeve

+

Bias

+

-

73

Volume Control

31 steps

Ω

20K

19

Ω

10K

+

20K

Headphone Ja ck

- Right O u t

26

+

20K

220µF

Ω

1K

10K

Ω

+

20K

-

Ω

10K

Ω

0.068µF

25242

Copyright  ANPEC Electronics Corp. Rev. A.1 - Apr., 2003

Shutdown

20K

Ω

20K

Ω

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APA4838

Application Information

Volume Control Table

Gain (dB) Voltage Range (% of Vdd) Voltage Range (Vdd=5V)

Low High R ecomme nded Low High Recomme nded

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. Rev. A.1 - Feb., 2003

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APA4838

Typical Characteristics

THD+N vs. Frequency

10

VDD=5V RL=3Ω Po=1.8W BTL

1

THD+N (%)

0.1

0.01 20 20k100 1k

Frequency (Hz)

Av=2

Av=4

Av=8

THD+N vs. Output Power

10

VDD=5V RL=3Ω Av=2 BTL

1

THD+N (%)

0.1

f=20Hz

0.01 10m 3100m 1

f=1KHz

Output Power (W)

f=20KHz

THD+N vs. Frequency

10

VDD=5V RL=4Ω Po=1.5W BTL

1

Av=2

Av=4

THD+N (%)

0.1

0.01 20 20k100 1k

Av=8

Frequency (Hz)

Copyright  ANPEC Electronics Corp. Rev. A.1 - Apr., 2003

THD+N vs. Output Power

10

VDD=5V RL=4Ω Av=2 BTL

1

0.1

THD+N (%)

0.01 100m 3500m

f=20KHz

f=1KHz

f=20Hz

Output Power (W)

1

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