Diodes PAM8803 User Manual

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Description

The PAM8803 is a 3W, class-D audio amplifier with 64-step digital

volume control. It offers low THD+N, allowing it to produce high-

quality sound reproduction. The new filterless architecture allows the

device to drive the speaker directly, without needing low-pass output

filters which will save 30% system cost and 75% PCB area.

With the same numbers of external components, the efficiency of the

PAM8803 is much better than class-AB cousins. It extends battery

life, making it ideal for portable applications.

The PAM8803 is available in a SSOP-24 package.

Features

3W FILTERLESS STEREO CLASS-D AUDIO

AMPLIFIER WITH DIGITAL VOLUME CONTROL

Pin Assignments

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PAM8803

 3W Output at 10% THD with a 4Ω Load and 5V Power Supply

 Filterless, Low Quiescent Current and Low EMI

 Low THD+N

 64-Step Digital Volume Control

 Superior Low Noise

 Low Pop Noise

 Efficiency up to 90%

 Short Circuit Protection

 Thermal Shutdown

 Few External Components to Save Space and Cost

 Pb-Free Packages

Typical Applications Circuit

Applications

 LCD Monitors/TV Projectors

 Notebook Computers

 Portable Speakers

 Portable DVD Players, Game Machines

 Cellular Phones/Speaker Phones

PAM8803

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Pin Descriptions

Pin

Number

1 -OUT_L Left Channel Negative Output

2 PGND Power GND

3 PGND Power GND

4 +OUT_L Left Channel Positive Output

5 PVDD Power VDD

6 MUTE Mute Control Input (active low), pull-up

7 VDD Analog VDD

8 INL Left Channel Input

9 NC No Connect

10 VREF Internal analog reference, connect a bypass capacitor from VREF to GND

11 NC No Connect

12 NC No Connect

13 DN Volume down Control (active low)

14 UP Volume up Control (active low)

15 RST Volume Controller Reset (active low)

16 NC No Connect

17 INR Right Channel Input

18 GND Analog GND

19 SHDN Shutdown Control Input (active low), pull-down

20 PVDD Power VDD

21 +OUT_R Right Channel Positive Output

22 PGND Power GND

23 PGND Power GND

24 -OUT_R Right Channel Negative Output

Pin

Name

Function

Functional Block Diagram

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PAM8803

PAM8803

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PAM8803

Absolute Maximum Ratings (@T

These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability.
All voltages are with respect to ground.

Parameter Rating Unit

Supply Voltage at No Input Signal 6.0

Input Voltage

Maximum Junction Temperature 150

Storage Temperature -65 to +150

Soldering Temperature 300, 5sec

Recommended Operating Conditions (@T

Parameter Rating Unit

Supply Voltage Range 2.2 to 5.5 V

Ambient Temperature Range -40 to +85 °C

Junction Temperature Range -40 to +125 °C

= +25°C, unless otherwise specified.)

A

-0.3 to V

DD

+0.3

= +25°C, unless otherwise specified.)

A

V

°C

Thermal Information

Parameter Package Symbol Max Unit

Thermal Resistance (Junction to Ambient) SSOP-24

PAM8803

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96 °C/W

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Electrical Characteristics (@T

Parameter Symbol Test Conditions Min Typ Max Units

Supply Voltage Range

Quiescent Current

Mute Current

Shutdown Current

SHDN Input High

SHDN Input Low

MUTE Input High

MUTE Input Low

Output Offset Voltage

Drain-Source On-State Resistance

Output Power

Total Harmonic Distortion Plus Noise THD+N

Power Supply Ripple Rejection PSRR

Channel Separation CS

Oscillator Frequency

Efficiency η

Signal Noise Ratio SNR

Under Voltage Lock-Out UVLO 1.95 V

Over Temperature Protection OTP 150 °C

Over Temperature Hysteresis OTH 60 °C

PAM8803

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= +25°C, VDD = 5V, Gain = 18dB, RL = 8Ω, unless otherwise specified.)

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DD

V

2.2 5.5 V

No Load 7 15

8

8.5

2.5 4 mA

0.5 10 µA

1.1 1.3

1.5 1.7

1.9 2.1

2.8 3.0

0.19

0.22

0.17

0.25

45 55 dB

60 80 dB

85 89 %

80 83 %

85 dB

87 dB

I

MUTE

I

SHDN

V

V

V

V

V

R

DS(ON)

f

I

Q

SH

SL

MH

ML

OS

P

OSC

O

RL = 8Ω

RL = 4Ω

V

V

IDS = 0.5A

= 0V

MUTE

= 0V

SHDN

1.2

0.5

1.2

0.5

No Load 120 300 mV

PMOSFET 0.3 0.40

N MOSFET 0.22 0.35

= 8Ω, THD =1%

R

L

f =1kHz

RL = 8Ω, THD = 10%

RL = 4Ω, THD = 1%

RL = 4Ω, THD = 10%

= 8Ω, PO = 0.5W

R

L

RL = 8Ω, PO = 1.0W

RL = 4Ω, PO = 1.0W

RL = 4Ω, PO = 2.0W

No Input, f = 1kHz, V

P

= 1W, RL = 4Ω

O

170 210 250 kHz

P

= 1.7W, f = 1kHz, RL = 8Ω

O

= 200mV

PP

PO = 3.0W, f = 1kHz, RL = 4Ω

R

f = 22 to 22kHz
THD = 1%

= 4Ω

L

RL = 8Ω

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mA

V

V

Ω

W

%

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Typical Performance Characteristics (@T

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= +25°C, unless otherwise specified.)

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PAM8803

PAM8803

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