ANPEC APA4835RI-TU Datasheet

APA4835

Stereo 2.8W Audio Power Amplifier with DC Volume Control

and Selectable Gain

Features General Description

•

Operating Voltage : 3.3V to 5V

• Stereo switchable bridged/single-ended

power amplifiers

• DC Volume Control Interface , 0dB to –105dB

• Low Supply Current , I

• Low Shutdown Current , I

= 13mA 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

–2.2W/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

• Depop Circuitry Integrated

• System Beep Detect

• Thermal shutdown protection circuitry

The APA4835 is a monolithic integrated circuit , which provides DC volume control , and a stereo bridged audio power amplifiers capable of producing 2.8W (2.2W) into 3Ω with less than 10% (1.0%) THD+N. APA4835 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 APA4835 is from 0dB (DC_Vol=0.7VDD) to –105dB (DC_Vol=0V) with 32 steps. Both of the depop circuitry and the thermal shutdown protection circuitry are integrated in APA4835 , 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 , APA4835 combines a stereo bridge-tied 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 SE/BTL input control pin signal. Besides the low supply current design to increase the efficiency of the amplifiers , APA4835 also features a shutdown function which keeps the supply current only 0.7µA (typ).

Pin Description

• High supply voltage ripple rejection

• Low Crossover Distortion

• PC99 Compliant

• 28-pin TSSOP-P (with enhanced thermal pad)

power package available

Applications

• Notebook and Desktop Computers

• Multimedia Monitors

GND

SHUTDOWN

Gain Select

Mode

Mute

V

DC Vol

GND

Right Dock

Right In Beep In

Left In

Left Dock

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

Right Out + V

DD

Right Out Right Gain 2

Right Gain 1 GND BYPASS HP Sense GND Left Gain 1

Left Gain 2 Left Out V

DD

Left Out +

• 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.7 - Mar., 2003

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APA4835

Ordering Information

APA4835

APA4835 R :

Block Diagram

DC Vol Control

Ω

20K

200K

Ω

200K

Ω

20K

Ω

APA4835 XXXXX

Mode

Mute

HP Sense

Left Dock

Ω

20K

Left In

µ

F

0.33 Beep In

µ

0.33

F

Right In

Right Dock

Ω

20K

Shutdown

V

DD

GND

Bypass

Handling Code Temp. Range Package C ode

Internal gain select

Mode

Control

Beep

Detect

Power

Management

Click and Pop

Suppression

Circuitry

+

Bias +

-

Package C ode R : T S S OP-P Temp. Range I : -40 to 85 C Handling Code TU : T u be TR : T a pe & R e e l

X X X X X - D a te Code

20K

10K

Ω

Volume Control

32 steps

10K

Ω

°

Ω

-

+

20K

20K +

20K

Ω

10K

Ω

20K

Ω

+

-

20K

Ω

10K

Ω

20K

Ω

- Left Out

+ Left Out

+ Right Out

- Right Out

Ω

20K

0.068µF

20K

Ω

20K

Ω

Absolute Maximum Ratings

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

Symbol Parameter Rating Unit

V

DD

T

A

T

J

T

STG

T

S

V

ESD

Note :*1. APA4835 integrates internal thermal shutdown protection when junction temperature ramp up to 150°C. *2. Human body model : C=100pF, R=1500Ω, 3 positive pulses plus 3 negative pulses

Copyright  ANPEC Electronics Corp. Rev. A.7 - Mar., 2003

Supply Voltage 6 V Operating Ambient Temperature Range -40 to 85 Maximum Junction Temperature Internally limited*

1

Storage Temperature Range -65 to +150 Soldering Temperature,10 seconds 260 Electrostatic Discharge -2000 to 2000*

2

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C

°

C

°

C

°

C

°

V

APA4835

Thermal Characteristics

Symbol

R

THJA

*5in2 printed circuit board with 2oz trace and copper pad through 12 25mil diameter vias. The thermal pad on the TSSOP_P package without solder on the printed circuit board.

**5in2 printed circuit board with 2oz trace and copper pad through 12 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

Parameter Rating Unit

TSSOP-P*

TSSOP-P**

60 35

°C/W

Electical Characteristics

Electrical Characteristics for Entire IC

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

APA4835Symbol Parameter Test Conditions

Min. Typ. Max.

V

I

Supply Voltage 3.3 5.5 V

DD

Quiescent Power Supply

DD

VIN=0V, IO=0A 13 25 mA

Current

I V V

Shutdown Current V

SD

SE/BTL High Input Voltage 4 V

IH

SE/BTL Low In put Voltage 0.8 V

IL

PIN 2

= V

DD

0.7 2.0

Unit

A

µ

Electrical Characteristics for Volume Attenuators

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

Min. Typ. Max.

RANGE

M

Attenuator Range

Mute Attenuation

Gain with V Attenuation with V V

=5V, Bridged Mode -88A

PIN 5

=5V, Single-Ended Mode -88

V

PIN 5

PIN 7

=5V ±0.5C

=0V -90 -105

PIN 7

Electrical Characteristics for BTL Mode Operation

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

V

P

Output Offset Voltage VIN=0V 5 mV

OS

O

Output Power

THD=1%, f=1kHz R

=3

Ω

L

R

=4

Ω

L

R

=8

Ω

L

THD=10%, f=1kHz

=8

R

Ω

L

Copyright  ANPEC Electronics Corp. Rev. A.7 - Mar., 2003

APA4835Symbol Parameter Test Conditions

Unit

dB

APA4835 UnitSymbol Parameter Test Conditions

Typ.

2.2

W

2.0

1.2

1.5

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APA4835

Electical Characteristics (Cont.)

Electrical Characteristics for BTL Mode Operation (Cont.)

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

THD+N Total Harmonic Distortion + Noise

PSRR Power Supply Rejection Ratio

X

TALK

Channel Separation

SNR Signal-to-Noise Ratio

V

Output Noise Voltage

N

Electrical Characteristics for SE Mode Operation

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

AVD=2, 20Hz<f<20kHz R

=4Ω , PO =1W

L

R

=8Ω , PO=1W

L

=32Ω , PO =340mW

R

L

V

=200mV

RIPPLE

C

=2.2µF, f=120Hz

B

f=1kHz , C V

=5V, PO =1.1W, RL=8Ω,A-Wtd

DD

B

Rms

=2.2µF

, RL=8

Ω

Filter R

=8Ω,A-Wtd Filter

L

APA4835 UnitSymbol Parameter Test Conditions

Typ.

0.2

0.15

0.1 74 dB

95 dB 95 dB

30 uV

%

APA4835Symbol Parameter Test Conditions

Unit

Typ.

V

THD+N

PSRR Power Supply Rejectio n

Output Offset Voltage VIN=0V 5 mV

OS

P

Output Power

O

Total Harmonic Distortion plus Noise

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

AV= 1 , V

=75mW, RL=32Ω, AV= 1, f=1kHz

P

O

V

RIPPLE

=1V

OUT

=200mV

RMS

R

=32

L

R

=32

L

, f=1kHz, RL=1k

, f=120Hz, CB=2.2µF

Ω Ω

Ω

0.005 %

95

100

mW

0.01 %

58 dB

Ratio X SNR Signal-to-Noise Ratio

Channel Separation

TALK

V

Output Noise Voltage

N

f=1kHz , C P

=75mW, RL=32Ω, A-Wtd Filter

O

=1kΩ, A-Wtd Filter

R

L

=2.2µF

B

95 dB

102 dB

40 uV

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 held high, Idd=0.7u A Gain Select 3 I Gain select input pin Mode 4 I Mode select input pin Mute 5 I Mute control input pin

I/O Description

Ground connection for circuitry.

Copyright  ANPEC Electronics Corp. Rev. A.7 - Mar., 2003

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APA4835

Pin Description

Name No

VDD 6, 16, 27 Supply voltage input pin DC_Vol 7 I Volume control function input pin. Right Dock 9 O Right docking out put 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 Doc k 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 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 Ou t - 26 O Right channel negative output pi n Right Ou t + 28 O Right channel po sitive out put pin

I/O Description

Truth Table for Logic Inputs

Mute Mode HP Sense DC Vol. Control Bridged Output

0 0 0 Fixed Level V ol. Fixed 0 0 1 Fixed Level Muted Vol. Fi xed 0 1 0 Adjusted Vol. Changes 0 1 1 Adjusted Muted Vol. Changed 1××-MutedMuted

Copyright  ANPEC Electronics Corp. Rev. A.7 - Mar., 2003

Single-Ended

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APA4835

Typical Application Circuit

To Control Pin on Headphone Jack

Beep In

Right Audio Inpu t

20K

200KΩ

20KΩ

100K

Ω

V

DD

Ω

Left Dock

Left In

0.33

Righ t In

0.33

Right Dock

V

DD

1,8,14,20,23

GND

µF0.1µF0.1µF

0.1

100K

Mute

Mode

20K

+

µF

+

µF

20K

6,16,27

Bypass

HP Sense

Ω

21

5 4

13

Ω

12

11

10

Ω

9

22

2.2µF

R_var

Intern a l g a in select

Mode

Control

Beep

Detect

Power

Management

Click and Pop

Suppression

Circuitry

V

DD

r*=R_var/50

+

Bias +

-

1 µF

V

DD

73

Volume

Control

32 steps

DC Vol Control

20K

19

10K

10KΩ

18

10K

20K

20KΩ20KΩ

10KΩ

25242

+

-

20KΩ

Ω

Ω20KΩ

17

15

28

26

Ω

20K

- Left Out +

220µ F

+ Le ft O ut

+ Right Out

- Right Out

+

220µ F

20KΩ

0.068µ F

0.068µF

Ω

1K

To HP sense

Circuit

Control

Headphone Jack

1KΩ

Ring

Tip

Sleeve

Ω

+

-

Shutdown

20K

Ω20KΩ

* Add a resistor to avoid volume control gain error at power on status. For the R_var with 10KΩ variable resistor, the recommended value of r is in range of 100~200Ω.

Copyright  ANPEC Electronics Corp. Rev. A.7 - Mar., 2003

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APA4835

Typical Characteristics

10

VDD=5V

5

RL=3Ω

Po=1.75W

2

1

0.5

0.2

0.1

0.05

0.02

0.01

BTL

20 20k50 100 200 500 1k 2k 5k 10k

THD+N-Total Harmonic Distortion+Noise (%)

10

VDD=5V

5

RL=8Ω

Po=1.0W

2

1

0.5

BTL

10

VDD=5V

5

RL=4Ω

Po=1.5W

2

BTL

1

0.5

0.2

0.1

0.05

0.02

0.01 20 20k50 100 200 500 1k 2k 5k 10k

THD+N-Total Harmonic Distortion+Noise (%)

Frequency (Hz)Frequency (Hz)

VDD=5V

5

RL=16Ω

Po=0.5W

2

1

0.5

BTL

0.2

0.1

0.05

0.02

0.01 20 20k50 100 200 500 1k 2k 5k 10k

AV=2AV=8

AV=4

THD+N-Total Harmonic Distortion+Noise (%)

Copyright  ANPEC Electronics Corp. Rev. A.7 - Mar., 2003

0.2

0.1

0.05

0.02

0.01 20 20k50 100 200 500 1k 2k 5k 10k

AV=4

AV=2

AV=8

THD+N-Total Harmonic Distortion+Noise (%)

Frequency (Hz)Frequency (Hz)

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