Rainbow Electronics MAX9714 User Manual

General Description

The MAX9713/MAX9714 mono/stereo class D audio
power amplifiers provide class AB amplifier performance
with class D efficiency, conserving board space and
eliminating the need for a bulky heatsink. Using a class
D architecture, these devices deliver up to 6W while
offering greater than 85% efficiency. Proprietary and
patent-protected modulation and switching schemes
render the traditional class D output filter unnecessary.

The MAX9713/MAX9714 offer two modulation schemes:
a fixed-frequency mode (FFM), and a spread-spectrum
mode (SSM) that reduces EMI-radiated emissions due
to the modulation frequency. The device utilizes a fully
differential architecture, a full bridged output, and com­prehensive click-and-pop suppression.

The MAX9713/MAX9714 feature high 76dB PSRR, low

0.07% THD+N, and SNR in excess of 100dB. Short-cir­cuit and thermal-overload protection prevent the
devices from being damaged during a fault condition.
The MAX9713 is available in a 32-pin TQFN (5mm x
5mm x 0.8mm) package. The MAX9714 is available in a
32-pin TQFN (7mm x 7mm x 0.8mm) package. Both
devices are specified over the extended -40°C to
+85°C temperature range.

Applications

Features

♦ Filterless Class D Amplifier
♦ Unique Spread-Spectrum Mode Offers 5dB

Emissions Improvement Over Conventional
Methods

♦ Up to 85% Efficient
♦ 6W Output Power into 8Ω
♦ Low 0.07% THD+N
♦ High PSRR (76dB at 1kHz)
♦ 10V to 25V Single-Supply Operation
♦ Differential Inputs Minimize Common-Mode Noise
♦ Pin-Selectable Gain Reduces Component Count
♦ Industry-Leading Integrated Click-and-Pop

Suppression

♦ Low Quiescent Current (18mA)
♦ Low-Power Shutdown Mode (0.2µA)
♦ Short-Circuit and Thermal-Overload Protection
♦ Available in Thermally Efficient, Space-Saving

Packages:

32-Pin TQFN (5mm x 5mm x 0.8mm)–MAX9713
32-Pin TQFN (7mm x 7mm x 0.8mm)–MAX9714

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum

Mono/Stereo Class D Amplifiers

________________________________________________________________ Maxim Integrated Products 1

19-3039; Rev 0; 10/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

*EP = Exposed paddle.

LCD Monitors

LCD TVs

Desktop PCs

LCD Projectors

High-End Notebook
Audio

Hands-Free Car
Phone Adaptors

MAX9714

0.47µF
INL+ OUTL+

OUTL-INL-

0.47µF

H-BRIDGE

0.47µF
INR+ OUTR+

OUTR-INR-

0.47µF

H-BRIDGE

Pin Configurations appear at end of data sheet.

MAX9713

0.47µF
IN+ OUT+

OUT-

IN-

0.47µF

H-BRIDGE

Block Diagrams

PART TEMP RANGE

MAX9713ETJ -40

MAX9714ETJ -40oC to +85oC

o

C to +85oC

PIN-PACKAGE

32 TQFN-EP*

32 TQFN-EP*

AMP

Mono

Stereo

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

(All voltages referenced to GND.)
V

DD

to PGND, AGND .............................................................30V

OUTR_, OUTL_, C1N..................................-0.3V to (V

DD

+ 0.3V)

C1P............................................(V

DD

- 0.3V) to (CHOLD + 0.3V)

CHOLD........................................................(V

DD

- 0.3V) to +40V

All Other Pins to GND.............................................-0.3V to +12V

Duration of OUTR_/OUTL_

Short Circuit to GND, V

DD

......................................Continuous

Continuous Input Current (V

DD

, PGND, AGND) ...................1.6A

Continuous Input Current (all other pins)..........................±20mA

Continuous Power Dissipation (T

A

= +70°C)
MAX9713 32-Pin TQFN (derate 21.3mW/°C

above +70°C)..........................................................1702.1mW

MAX9714 32-Pin TQFN (derate 33.3mW/°C

above +70°C)..........................................................2666.7mW

Junction Temperature......................................................+150°C

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(VDD= 15V, GND = PGND = 0V, SHDN ≥ VIH, AV= 16dB, CSS= CIN= C

REG

= 0.47µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 = GND

(f

S

= 330kHz), RLconnected between OUTL+ and OUTL- and OUTR+ and OUTR-, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

A

= +25°C.) (Notes 1, 2)

GENERAL

Supply Voltage Range V

Quiescent Current I

Shutdown Current I

Turn-On Time t

Amplifier Output Resistance in
Shutdown

Input Impedance R

Voltage Gain A

Gain Matching Between channels (MAX9714) 0.5 %

Output Offset Voltage V

Common-Mode Rejection Ratio CMRR fIN = 1kHz, input referred 60 dB

Power-Supply Rejection Ratio
(Note 3)

Output Power P

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DD

DD

SHDN

ON

IN

V

OS

PSRR

OUT

Inferred from PSRR test 10 25 V

RL = ∞

CSS = 470nF 100

CSS = 180nF 50

SHDN = GND 150 330 kΩ

AV = 13dB 35 58 80

AV = 16dB 30 48 65

AV = 19.1dB 23 39 55

AV = 22.1dB 20 31 42

G1 = L, G2 = L 21.9 22.1 22.3

G1 = L, G2 = H 18.9 19.1 19.3

G1 = H, G2 = L 12.8 13 13.2

G1 = H, G2 = H 15.9 16 16.3

VDD = 10V to 25V 54 76

200mV

TH D + N = 10%,
f = 1kH z

P-P

ripple

MAX9713 10 17.5

MAX9714 18 23

f

RIPPLE

f

RIPPLE

RL = 16Ω 5.5 8

R

= 1kHz 76

= 20kHz 60

= 8Ω 6

L

0.2 1.5 µA

±1.6 ±1.3 mV

mA

ms

kΩ

dB

dB

W

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum

Mono/Stereo Class D Amplifiers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 15V, GND = PGND = 0V, SHDN ≥ VIH, AV= 16dB, CSS= CIN= C

REG

= 0.47µF, C1 = 100nF, C2 = 1µF, FS1 = FS2 = GND

(f

S

= 330kHz), RLconnected between OUTL+ and OUTL- and OUTR+ and OUTR-, TA= T

MIN

to T

MAX

, unless otherwise noted.

Typical values are at T

A

= +25°C.) (Notes 1, 2)

Note 1: All devices are 100% production tested at +25°C. All temperature limits are guaranteed by design.
Note 2: Testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For R

L

= 8Ω, L = 68µH.

For R

L

= 16Ω, L = 136µH.

Note 3: PSRR is specified with the amplifier inputs connected to GND through C

IN

.

Total Harmonic Distortion Plus
Noise

Signal-to-Noise Ratio SNR

Oscillator Frequency f

Efficiency η

DIGITAL INPUTS (SHDN, FS_, G_)

Input Thresholds

Input Leakage Current ±1µA

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

THD+N

OSC

f

= 1kHz, either FFM or SSM, RL = 8Ω,

IN

P

= 4W

OUT

BW = 22Hz to

R

= 8Ω, P

L

4W, f = 1kHz

FS1 = L, FS2 = L 300 335 370

FS1 = L, FS2 = H 460

FS1 = H, FS2 = L 236

FS1 = H, FS2 = H (spread-spectrum mode) 335

P

OUT

P

OUT

V

IH

V

IL

OUT

= 5W, f

= 4W, f = 1kHz, RL = 8Ω 75

22kHz

=

A-weighted

= 1kHz, RL = 16Ω 85

IN

FFM 94

SSM 88

FFM 97

SSM 91

2.5

0.07 %

0.8

dB

kHz

%

V

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers

4 _______________________________________________________________________________________

S

S

Typical Operating Characteristics

(136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

VDD = +15V

= 13dB

A

V

= 8Ω

R

L

1

THD+N (%)

0.1

0.01
10 100k

P

OUT

P

= 4W

OUT

= 100mW

10k1k100

FREQUENCY (Hz)

MAX9713 toc01

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

VDD = +20V

= 13dB

A

V

= 16Ω

R

L

1

P

= 7.5W

THD+N (%)

0.1

0.01

OUT

P

= 120mW

OUT

10 100k

FREQUENCY (Hz)

10k1k100

MAX9713 toc04

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

100

VDD = 20V

= 13dB

A

V

= 8Ω

R

L

10

MAX9713 toc07

TOTAL HARMONIC DISTORTION PLU

NOISE vs. FREQUENCY

10

VDD = +20V

= 13dB

A

V

= 8Ω

R

L

1

THD+N (%)

0.1

0.01
10 100k

P

OUT

P

= 4W

OUT

= 100mW

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

10

VDD = +15V

= 13dB

A

V

= 4W

P

OUT

= 8Ω

R

L

1

THD+N (%)

0.1

0.01
10 100k

SSM

FFM

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

100

VDD = 15V

= 13dB

A

V

= 16Ω

R

L

10

10k1k100

10k1k100

MAX9713 toc02

MAX9713 toc05

MAX9713 toc08

TOTAL HARMONIC DISTORTION PLU

NOISE vs. FREQUENCY

10

VDD = +15V

= 13dB

A

V

= 16Ω

R

L

1

P

= 5W

THD+N (%)

0.1

0.01

OUT

P

= 55mW

OUT

10 100k

FREQUENCY (Hz)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

100

VDD = 15V

= 13dB

A

V

= 8Ω

R

L

10

1

THD+N (%)

0.1

0.01

0.001
0765

f = 1kHz

f = 100Hz

4321

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

100

VDD = 20V

= 13dB

A

V

= 16Ω

R

L

10

MAX9713 toc03

10k1k100

MAX9713 toc06

f = 10kHz

MAX9713 toc09

1

THD+N (%)

0.1

0.01

0.001
07

f = 1kHz

f = 100Hz

123456

OUTPUT POWER (W)

f = 10kHz

f = 10kHz

1

THD+N (%)

0.1

0.01

0.001
08

f = 1kHz

f = 100Hz

OUTPUT POWER (W)

f = 10kHz

642

1

THD+N (%)

0.1

0.01

0.001
015

f = 1kHz

f = 100Hz

OUTPUT POWER (W)

f = 10kHz

105

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum

Mono/Stereo Class D Amplifiers

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.)

TOTAL HARMONIC DISTORTION PLUS

100

VDD = 15V

= 13dB

A

V

f = 1kHz

10

= 8Ω

R

L

1

THD+N (%)

0.1

0.01

0.001
08

SSM

FFM

642

OUTPUT POWER (W)

MAX9713 toc10

EFFICIENCY (%)

OUTPUT POWER

vs. SUPPLY VOLTAGE

NOISE vs. OUTPUT POWER

8

7

6

5

4

3

OUTPUT POWER (W)

2

AV = 13dB

1

THD+N = 10%

= 8Ω

R

L

0

10 25

SUPPLY VOLTAGE (V)

22191613

MAX9713 toc13

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

0

-10

-20

-30

PSRR (dB)

-40

-50

-60

-70
10 100k

VDD = 15V
A

V

V

RIPPLE

RL = 16Ω

FREQUENCY (Hz)

= 13dB

= 200mV

10k1k100

MAX9713 toc16

P-P

CROSSTALK (dB)

EFFICIENCY vs. OUTPUT POWER

100

RL = 16Ω

90

80

70

60

50

40

30

20

10

0

010

RL = 8Ω

OUTPUT POWER (W)

OUTPUT POWER

vs. LOAD RESISTANCE

10

VDD = 15V

9

= 13dB

A

V

8

7

6

5

4

OUTPUT POWER (W)

3

2

1

0

1 10 100

THD+N = 1%

LOAD RESISTANCE (Ω)

CROSSTALK vs. FREQUENCY

0

OUTPUT REFERRED

= 13dB

A

V

-20

-40

-60

-80

-100

-120

LEFT TO RIGHT

RIGHT TO LEFT

0.01 100
FREQUENCY (Hz)

VDD = 15V

= 13dB

A

V

8642

THD+N = 10%

1010.1

100

90

MAX9713 toc11

80

70

60

50

40

EFFICIENCY (%)

30

20

10

0

0

-10

MAX9713 toc14

-20

-30

-40

-50

CMRR (dB)

-60

-70

-80

-90

20

MAX9713 toc17

0

-20

-40

-60

-80

OUTPUT MAGNITUDE (dB)

-100

-120

-140

EFFICIENCY vs. OUTPUT POWER

RL = 16Ω

MAX9713 toc12

= 8Ω

R

L

VDD = 20V

= 13dB

A

V

012

OUTPUT POWER (W)

COMMON-MODE REJECTION RATIO

vs. FREQUENCY

10 100k

FREQUENCY (Hz)

OUTPUT FREQUENCY SPECTRUM

020

FREQUENCY (Hz)

963

VDD = 15V

= 13dB

A

V

= 8Ω

R

L

10k1k100

FFM MODE

= 5W

P

OUT

f =1kHz

= 8Ω

R

L

UNWEIGHTED

15105

MAX9713 toc15

MAX9713 toc18

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum
Mono/Stereo Class D Amplifiers

6 _______________________________________________________________________________________

MAX9713 toc24

Typical Operating Characteristics (continued)

(136µH with 16Ω, 68µH with 8Ω, part in SSM mode, unless otherwise noted.)

OUTPUT FREQUENCY SPECTRUM

20

0

-20

-40

-60

-80

OUTPUT MAGNITUDE (dB)

-100

-120

-140
0 20k

FREQUENCY (Hz)

SSM MODE

= 5W

P

OUT

f = 1kHz

= 8Ω

R

L

UNWEIGHTED

15k10k5k

MAX9713 toc19

OUTPUT MAGNITUDE (dB)

WIDEBAND OUTPUT SPECTRUM

(SSM MODE)

0

-10

-20

-30

-40

-50

-60

-70

OUTPUT AMPLITUDE (dB)

-80

-90

-100
1M 10M 100M

FREQUENCY (Hz)

OUTPUT FREQUENCY SPECTRUM

20

0

-20

-40

-60

-80

-100

-120
0 20k

FREQUENCY (Hz)

MAX9713toc22

SHDN

MAX9714

OUTPUT

SSM MODE
P

OUT

f = 1kHz

= 8Ω

R

L

A-WEIGHTED
RBW = 10kHz

15k10k5k

CSS = 180pF

f = 1kHz
R

L

WIDEBAND OUTPUT SPECTRUM

0

= 5W

TURN-ON/TURN-OFF RESPONSE

= 8Ω

-10

MAX9713 toc20

-20

-30

-40

-50

-60

-70

OUTPUT AMPLITUDE (dB)

-80

-90

-100

20ms/div

MAX9713 toc23

(FFM MODE)

RBW = 10kHz

MAX1973toc21

1M 10M 100M

FREQUENCY (Hz)

5V/div

1V/div

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

25

20

15

10

SUPPLY CURRENT (mA)

5

0

10 20

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

18161412

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

0.35

0.30

0.25

0.20

0.15

0.10

0.05

0

10 20

SUPPLY VOLTAGE (V)

18161412

MAX9713 toc25