Diodes PAM8407 User Manual

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A PRODUCT LINE OF

DIODES INCORPORATED

2x3W Stereo Differential Input Class D Audio Amplifier

Description

The PAM8407 is a filter-less Class-D amplifier with high SNR and differential input that helps eliminate noise. Advanced 32-step Up/Down volume control minimizes external components and allows speaker volume control.

The PAM8407 supports 2.5V to 6V operation make it idea for up to 4 cells alkaline battery applications.

Features like greater than 87% efficiency and small PCB area make the PAM8407 Class-D amplifier ideal for portable applications. The output uses a filter-less architecture minimizing the number of external components and PCB area whilst providing a high performance, simple and lower cost system.

The PAM8407 built in auto recovery SCP (short circuit protection) and thermal shutdown.

The PAM8407 is available in SO-16 package.

New Product

Features

 3W Output at 10% THD with a 4Ω load and 5V Supply  2.4W Output at 1% THD with a 4Ω Load and 5V Supply  2.5V to 6.0V VDD Operating  Fully Differential Input  Filterless, Low Quiescent Current and Low EMI  Low THD+N  32-stepUp/Down Volume Control from -80dB to 24dB  Superior Low Noise: 60uV  Minimize Pop/Clip Noise  Auto Recovery Short Circuit Protection  Thermal Shutdown  Pb-Free SO-16 Package

with U

/Down Volume Control

Pin Assignments

RINP

RINN

SD

UP

DOWN

GND

LINN LINP

Applications

 PC Speaker  Wireless Speaker  Home Sound Systems  Active Speakers  Docking stations

PAM8407

SO-16

1

2

3

4 5

6 7

8

XXXYW WLL

PAM8407

16 15

14

13

12

11

10

9

VDD

ROUTP ROUTN GND GND

LOUTN

LOUTP

VDD

Typical Applications Circuit

RINP

RINN

SHDN

LINN

LINP

C5

01. uF C6

01. uF

ON

C7

01. uF C8

01.

PAM8407

Document number: DS36815 Rev. 1 - 2

uF

1 RINP

2 RINN

3 SD

4 UP

5 DOWN

6 GND

7 LINN

8 LINP

PAM8407

www.diodes.com

VDD 16

ROUTP 15

ROUTN 14

GND 13

GND 12

LOUTN 11

LOUTP 10

1 of 12

VDD 9

4Ω

C2

1uF

C2

1uF

V

DD

V

DD

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A PRODUCT LINE OF

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Pin Descriptions

PIN Number PIN Name Description

1 RINP Positive Input of Right Channel Power Amplifier.

2 RINN Negative Input of Right Channel Power Amplifier.

3 SD Full Chip Shutdown Control Input (active low).

4 UP Volume UP Control (active low)Ground Connection.

5 DOWN Volume down Control (active low)

6,12,13 GND Ground.

7 LINN Negative Input of Left Channel Power Amplifier.

8 LINP Positive Input of Left Channel Power Amplifier.

New Product

9,16 VDD Power Supply.

10 LOUTP Positive Output of Left Channel Power Amplifier.

11 LOUTN Negative Output of Left Channel Power Amplifier.

14 ROUTN Negative Output of Right Channel Power Amplifier.

15 ROUTP Positive Output of Right Channel Power Amplifier.

Functional Block Diagram

2x3W Stereo Differential Input Class D Audio Amplifier

with U

/Down Volume Control

PAM8407

VDD

GND

RINP

RINN

VDD

UP

VDD

DOW N

LIN N

LINP

VDD

Absolute Maximum Ratings (@T

In terf ac e Co n tro l

= +25°C, unless otherwise specified.)

A

+

-

Attenuation Decoder

OSCILLATOR

OSC

+

-

Parameter Rating Unit

Supply Voltage (VDD) 6.5

Pins Input Voltage (SD, UP, Down, IN) -0.3 to VDD+0.3

Storage Temperature -65 to +150

Maximum Junction Temperature +150

Junction to ambient thermal resistance 40

MODULATOR

INTERNAL

MODUL ATO R

DRIVER

Thermal

Protection

BIAS AND REFERE NCES

Current

Protection

DRIVER

GND

ROUTP

ROUTN

VDD

SD

LOUT N

LOUT P

V

°C

°C/W

PAM8407

Document number: DS36815 Rev. 1 - 2

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A PRODUCT LINE OF

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2x3W Stereo Differential Input Class D Audio Amplifier

with U

/Down Volume Control

Recommended Operating Conditions (@T

= +25°C, unless otherwise specified.)

A

Symbol Parameter Min Max Unit

VDD

TA

TJ

Operating Ambient Temperature Range -40 +85 °C

Supply Voltage 2.5 6.0 V

Junction Temperature Range -40 +125 °C

Electrical Characteristics (@TA=25°C, VDD=5.0V, Gain=24dB, RL=8Ω (33μH)+R+L(33μH), unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

New Product

Supply Voltage Range

Quiescent Current

Output Offset Voltage

Drain-Source On-State Resistance

V

R

DS(ON)

I

— 2.5 — 5.5 V

DD

No Load —

Q

No Load —

OS

I

DS

= 0.5A

P MOSFET —

N MOSFET — 0.2 —

PAM8407

8 — mA

10 — mV

0.3 —

Ω

1.4 —

R

= 8Ω

Output Power

Total Harmonic Distortion Plus Noise

Power Supply Ripple Rejection PSRR Input AC-GND, f = 1KHz, Vpp = 200mV — 70 — dB

Channel Separation CS

Oscillator Frequency

Efficiency η

Noise Vn

Signal Noise Ratio SNR f = 20-20kHz, THD = 1% — 95 — dB

Turn-on Time Ton VDD = 5V — 0.65 — S

Mute Current

Shutdown Current

Logic Input High

Logic Input Low

Over Temperature Protection OTP — — 150 — °C

P

THD+N

f

OSC

I

MUTE

I

SD

V

THD+N = 1%,

O

f = 1kHz

= 8Ω，PO = 0.85W, f = 1KHz

R

L

RL = 4Ω，PO = 1.75W, f = 1KHz

P

= 1W, f = 1KHz

O

— 200 250 300 kHz

P

= 1.1W,f = 1kHz, RL = 8Ω

O

PO = 2.4W,f = 1kHz, RL = 4Ω

Input AC-GND

MUTE = VDD — 4 10 mA

V

IH

IL

= 0V

SD

Include SD, UP, DOWN 1.4 — — V

Include SD, UP, DOWN — — 0.6 V

L

RL = 4Ω

A-weighting — 60 —

No A-weighting — 80 —

—

2.4 —

—

0.08 —

—

0.08 —

-95 — dB

—

— 87 — %

— 83 — %

— — 1 µA

W

%

μV

Over Temperature Hysteresis OTH — — 40 — °C

PAM8407

Document number: DS36815 Rev. 1 - 2

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Performance Characteristics (@T

THD+N Vs. Output Power (RL=8Ω) THD+N Vs. Output Power (RL=4Ω)

20

10

f=100Hz/1kHz/10kHz

5

(Red/Pink/Blue)

2

1

0.5

%

0.2

0.1

0.05

0.02

0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 2

New Product

PAM8407

Document number: DS36815 Rev. 1 - 2

THD+N Vs. Frequency (RL=8Ω) THD+N Vs. Frequency (RL=4Ω)

10

5

2

1

0.5

%

0.2

0.1

0.05

0.02

0.008 20 20k50 100 200 500 1k 2k 5k 10k

PO=0.3W/0.5W/1W (Red/Pink/Blue)

PSRR Vs. Frequency Crosstalk Vs Frequency

+0

-5

-10

-15

-20

-25

-30

-35

d

-40

B

-45

-50

-55

-60

-65

-70

-75

-80

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

2x3W Stereo Differential Input Class D Audio Amplifier

with U

= +25°C, V

A

W

Hz

= 5V, Gain = 24dB, RL = L(33μH) + R + L(33μH), unless otherwise noted.)

DD

%

d B

4 of 12

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/Down Volume Control

40

20

f=100Hz/1kHz/10kHz

10

(Red/Pink/Blue)

5

2

1

0.5

0.2

0.1

0.05

0.02

0.01 1m 2m 5m 10m 20m 50m 100m 200m 500m 1 2

10

PO=0.5W/1W/2W

5

(Red/Pink/Blue)

2

1

0.5

0.2

0.1

0.05

0.02

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

+0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-110

-120

-130

-140

T

L to R

R to L

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

PAM8407

W

Hz

January 2014