Diodes PAM8007 User Manual

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Description

The PAM8007 is a 3W, Class-D audio amplifier with headphone

amplifier. Advanced 64-Step DC volume control minimizes external

components and allows speaker volume control and headphone

volume control. It offers low THD+N, to produce high-quality sound

reproduction. The new filterless architecture allows the device to drive

the speaker directly, without 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

PAM8007 is much better than class-AB cousins. It can extend the

battery life thus be ideal for portable applications.

The PAM8007 is available in a SSOP-24 and SOP-24 package.

Features

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PAM8007

FILTERLESS 3W CLASS-D STEREO AUDIO AMPLIFIER

with DC VOLUME CONTROL and HEADPHONE OUTPUT

Pin Assignments

• 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 DC Volume Control

• Headphone Output Function

• Superior Low Noise

• Low Pop Noise

• Efficiency Up to 92%

• Short Circuit Protection

• Thermal Shutdown

• Few External Components to Save the Space and Cost

• Pb-Free Package

Applications

• LCD Monitors / TV Projectors

• Notebook Computers

• Portable Speakers

• Portable DVD Players, Game Machines

• VoIP/Speaker Phones

PAM8007

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Typical Applications Circuit

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PAM8007

Pin Descriptions

Number

1 -OUT_L Left Channel Negative Output

2 PGNDL Left Channel Power GND

3 PGNDL Left Channel Power GND

4 +OUT_L Left Channel Positive Output

5 PVDDL Left Channel Power Supply

6 MUTE Mute Control Input (active low)

7 VDD Analog VDD

8 INL Left Channel Input

9 EAR INL Left Earphone Input

10 VDC Analog Reference for Gain Control Section

11 VOLUME DC Volume Control to Set the Gain of Class-D

12 EAR OUT L Left Earphone Output(Non-Inverting)

13 EAR OUT R Right Earphone Output(Non-Inverting)

14 VREF Internal Analog Reference, connect a bypass capacitor from VREF to GND

15 LINE/EAR Line / Earphone Switch. Speaker Output (active low), Earphone Output (active high)

16 EAR LN R Right Earphone Input

17 INR Right Channel Input

18 GND Analog GND

19 SHDN Shutdown Control Input (active low)

20 PVDDR Right Channel Power Supply

21 +OUT_R Right Channel Positive Output

22 PGNDR Right Channel Power GND

23 PGNDR Right Channel Power GND

24 -OUT_R Right Channel Negative Output

PAM8007

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Function

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Functional Block Diagram

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PAM8007

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 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 2.5 to 5.5 V

Ambient Operation Temperature Range -20 to +85 °C

Junction Temperature Range -20 to +125 °C

PAM8007

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= +25°C, unless otherwise specified.)

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-0.3 to V

+0.3

DD

= +25°C, unless otherwise specified.)

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V

°C

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PAM8007

Thermal Information

Parameter Package Symbol Max Unit

= 8Ω

= 200mV

PP

= 200mV

PP

90

32

°C/W

2.5 5.5 V

12 16 mA

Ω

1.55 1.75

2.85 3.1

0.12

0.15

W

%

63 dB

-88 dB

85 92 %

80 88 %

µV

69 mW

0.04 %

73 dB

95 dB

µV

8 12 mA

20 µA

V

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Thermal Resistance (Junction to Ambient)

Thermal Resistance (Junction to Case)

SSOP-24

SOP-24 79.2

SSOP-24

SOP-24 27

θ

JA

θ

JC

Electrical Characteristics (@T

= +25°C, VDD = 5V, Gain = 24dB, RL = 8Ω, unless otherwise specified.)

A

Parameter Symbol Test Conditions Min Typ Max Units

Class D Stage

Supply Voltage Range

Quiescent Current

Output Offset Voltage

Drain-Source On-State Resistance

Output Power

Total Harmonic Distortion Plus Noise

V

I

V

R

DS(ON)

P

THD+N

Power Supply Ripple Rejection PSRR

Channel Separation CS

Oscillator Frequency

f

OSC

Efficiency η

Noise

V

DD

No Load

Q

No Load 10 50 mV

OS

IDS = 0.5A

THD+N = 10%

O

f = 1kHz

R

= 8Ω, PO = 1W, f = 1KHz

L

= 4Ω, PO = 2W, f = 1KHz

L

P MOSFET 0.23

N MOSFET 0.17

R

L

RL = 4Ω

Input AC-GND, f = 1KHz, V

V

= 1V

O

200 250 300 kHz

P

= 1.75W, f =1 kHz, RL = 8Ω

O

, f = 1KHz

RMS

PO = 3.0W, f =1 kHz, RL = 4Ω

N

Input AC-GND Gain = 12dB

A-Weighting 65

No A-Weighting 90

Signal Noise Ratio SNR f = 20 – 20kHz, THD = 1% 84 dB

Earphone Stage

Output Power

Total Harmonic Distortion Plus Noise THD+N

Power Supply Ripple Rejection PSRR

Channel Separation CS

Noise

P

THD+N = 1%, RL = 32Ω, f = 1kHz

O

R

= 32Ω, PO = 10mW, f = 1kHz

L

Input AC-GND, f = 1kHz, V

V

= 1V

O

V

Input

N

AC-GND

, f = 1kHz

RMS

A-Weighting 19

No A-Weighting 25

Signal Noise Ratio SNR f = 20 – 20kHz, THD = 1% 97 dB

Control Section

Mute Current

Shutdown Current

SHDN Input High

SHDN Input Low

MUTE Input High

MUTE Input Low

Line/Ear Input High

Line/Ear Input Low

I

MUTE

I

SHDN

V

SH

SL

MH

ML

DH

DL

V

= 0V

MUTE

= 0V

SHDN

1.5

0.4

1.5

0.4

2.5

0.4

Over Temperature Protection OTP 150 °C

Over Temperature Hysteresis OTH 30 °C

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Typical Performance Characteristics (@T

Speaker

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= +25°C, unless otherwise specified.)

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Typical Performance Characteristics (cont.) (@T

Speaker

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= +25°C, unless otherwise specified.)

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