MAXIM MAX9713, 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 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 95dB. 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 6; 12/06

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.

EVALUATION KIT

AVAILABLE

Ordering Information

PART

AMP

32 TQFN-EP*

Mono

32 TQFN-EP*

Stereo

*EP = Exposed paddle.
+Denotes lead-free package.

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

TEMP RANGE PIN-PACKAGE

MAX9713ETJ+ -40oC to +85oC

MAX9714ETJ+ -40oC to +85oC

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)

Single-Layer Board:

MAX9713 32-Pin TQFN (derate 21.3mW/°C

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

MAX9714 32-Pin TQFN (derate 27mW/°C

above +70°C)..........................................................2162.2mW

Multilayer Board:

MAX9713 32-Pin TQFN (derate 34.5mW/°C

above +70°C)..........................................................2758.6mW

MAX9714 32-Pin TQFN (derate 37mW/°C

above +70°C)..........................................................2963.0mW

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= 0.47µF, C

REG

= 0.01µF, 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)

PARAMETER

CONDITIONS

UNITS

GENERAL

Supply Voltage Range V

DD

Inferred from PSRR test 10 25 V

MAX9713 10

Quiescent Current I

DD

RL = ∞

MAX9714 18 23

mA

Shutdown Current

0.2 1.5 µA

CSS = 470nF 100

Turn-On Time t

ON

CSS = 180nF 50

ms

Amplifier Output Resistance in
Shutdown

SHDN = GND 150 330

kΩ

AV = 13dB 35 58 80

AV = 16dB 30 48 65

AV = 19.1dB 23 39 55

Input Impedance R

IN

AV = 22.1dB 20 31 42

kΩ

G1 = L, G2 = L

G1 = L, G2 = H

G1 = H, G2 = L

13

Voltage Gain A

V

G1 = H, G2 = H

16

dB

Gain Matching Between channels (MAX9714) 0.5 %

Output Offset Voltage V

OS

±6 ±30

mV

fIN = 1kHz, input referred 60

dB

VDD = 10V to 25V 54 76

f

RIPPLE

= 1kHz 76

Power-Supply Rejection Ratio
(Note 3)

PSRR

200mV

P-P

ripple

f

RIPPLE

= 20kHz 60

dB

SYMBOL

MIN TYP MAX

I

SHDN

Common-Mode Rejection Ratio CMRR

21.9 22.1 22.3

18.9 19.1 19.3

12.8

15.9

17.5

13.2

16.3

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= 0.47µF, C

REG

= 0.01µF, 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)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

RL = 16Ω 8

Output Power P

OUT

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

R

L

= 8Ω 6

W

Total Harmonic Distortion Plus
Noise

fIN = 1kHz, either FFM or SSM, RL = 8Ω,
P

OUT

= 4W

%

FFM 94

BW = 22Hz to
22kHz

SSM 88

FFM 97

Signal-to-Noise Ratio SNR

R

L

= 8Ω, P

OUT

=

4W, f = 1kHz

A-weighted

SSM 91

FS1 = L, FS2 = L 300 335 370

FS1 = L, FS2 = H 460

FS1 = H, FS2 = L 236

Oscillator Frequency f

OSC

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

P

OUT

= 5W, fIN = 1kHz, RL = 16Ω 85

Efficiency η

P

OUT

= 4W, f = 1kHz, RL = 8Ω 75

%

DIGITAL INPUTS (SHDN, FS_, G_)

V

IH

2.5

Input Thresholds

V

IL

0.8

V

Input Leakage Current ±1µA

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

.

THD+N

0.07

dB

kHz

MAX9713/MAX9714

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

4 _______________________________________________________________________________________

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

MAX9713 toc01

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.1

1

10

0.01
10 100k

VDD = +15V
A

V

= 13dB

R

L

= 8

Ω

P

OUT

= 4W

P

OUT

= 100mW

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

MAX9713 toc02

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.1

1

10

0.01
10 100k

VDD = +20V
A

V

= 13dB

R

L

= 8

Ω

P

OUT

= 4W

P

OUT

= 100mW

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

MAX9713 toc03

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.1

1

10

0.01
10 100k

VDD = +15V
A

V

= 13dB

R

L

= 16

Ω

P

OUT

= 5W

P

OUT

= 55mW

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

MAX9713 toc04

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.1

1

10

0.01
10 100k

VDD = +20V
A

V

= 13dB

R

L

= 16

Ω

P

OUT

= 7.5W

P

OUT

= 120mW

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9713 toc07

OUTPUT POWER (W)

THD+N (%)

123456

0.01

0.1

1

10

100

0.001
07

VDD = 20V
A

V

= 13dB

R

L

= 8

Ω

f = 100Hz

f = 1kHz

f = 10kHz

f = 10kHz

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. FREQUENCY

MAX9713 toc05

FREQUENCY (Hz)

THD+N (%)

10k1k100

0.1

1

10

0.01
10 100k

VDD = +15V
A

V

= 13dB

P

OUT

= 4W

R

L

= 8Ω

SSM

FFM

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9713 toc06

OUTPUT POWER (W)

THD+N (%)

4321

0.01

0.1

1

10

100

0.001
0765

VDD = 15V
A

V

= 13dB

R

L

= 8Ω

f = 100Hz

f = 1kHz

f = 10kHz

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9713 toc08

OUTPUT POWER (W)

THD+N (%)

642

0.01

0.1

1

10

100

0.001
08

VDD = 15V
A

V

= 13dB

R

L

= 16Ω

f = 100Hz

f = 1kHz

f = 10kHz

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9713 toc09

OUTPUT POWER (W)

THD+N (%)

105

0.01

0.1

1

10

100

0.001
015

VDD = 20V
A

V

= 13dB

R

L

= 16Ω

f = 100Hz

f = 1kHz

f = 10kHz

Typical Operating Characteristics

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

MAX9713/MAX9714

6W, Filterless, Spread-Spectrum

Mono/Stereo Class D Amplifiers

_______________________________________________________________________________________ 5

TOTAL HARMONIC DISTORTION PLUS

NOISE vs. OUTPUT POWER

MAX9713 toc10

OUTPUT POWER (W)

THD+N (%)

642

0.01

0.1

1

10

100

0.001
08

VDD = 15V
A

V

= 13dB
f = 1kHz
R

L

= 8Ω

SSM

FFM

EFFICIENCY vs. OUTPUT POWER

MAX9713 toc11

OUTPUT POWER (W)

EFFICIENCY (%)

8642

10

20

30

40

50

60

70

80

90

100

0

010

RL = 16Ω

RL = 8Ω

VDD = 15V
A

V

= 13dB

EFFICIENCY vs. OUTPUT POWER

MAX9713 toc12

OUTPUT POWER (W)

EFFICIENCY (%)

963

10

20

30

40

50

60

70

80

90

100

0

012

RL = 16Ω

R

L

= 8

Ω

VDD = 20V
A

V

= 13dB

OUTPUT POWER

vs. SUPPLY VOLTAGE

MAX9713 toc13

SUPPLY VOLTAGE (V)

OUTPUT POWER (W)

22191613

8

7

6

5

4

3

2

1

0

10 25

AV = 13dB
THD+N = 10%
R

L

= 8Ω

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

MAX9713 toc16

FREQUENCY (Hz)

PSRR (dB)

10k1k100

-60

-50

-40

-30

-20

-10

0

-70
10 100k

VDD = 15V
A

V

= 13dB

V

RIPPLE

= 200mV

P-P

RL = 16Ω

10

9

8

7

6

5

4

3

2

1

0

1 10 100

OUTPUT POWER

vs. LOAD RESISTANCE

MAX9713 toc14

LOAD RESISTANCE (Ω)

OUTPUT POWER (W)

VDD = 15V
A

V

= 13dB

THD+N = 10%

THD+N = 1%

COMMON-MODE REJECTION RATIO

vs. FREQUENCY

MAX9713 toc15

FREQUENCY (Hz)

CMRR (dB)

10k1k100

-80

-70

-60

-50

-40

-30

-20

-10

0

-90

10 100k

VDD = 15V
A

V

= 13dB

R

L

= 8Ω

CROSSTALK vs. FREQUENCY

MAX9713 toc17

FREQUENCY (Hz)

CROSSTALK (dB)

1010.1

-80

-100

-60

-40

-20

0

-120

0.01 100

LEFT TO RIGHT

RIGHT TO LEFT

OUTPUT REFERRED
A

V

= 13dB

OUTPUT FREQUENCY SPECTRUM

MAX9713 toc18

FREQUENCY (Hz)

OUTPUT MAGNITUDE (dB)

15105

-120

-100

-80

-60

-40

-20

0

20

-140
020

FFM MODE
P

OUT

= 5W
f =1kHz
R

L

= 8Ω

UNWEIGHTED

Typical Operating Characteristics (continued)

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

MAX9713/MAX9714

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

6 _______________________________________________________________________________________

OUTPUT FREQUENCY SPECTRUM

MAX9713 toc19

FREQUENCY (Hz)

OUTPUT MAGNITUDE (dB)

15k10k5k

-120

-100

-80

-60

-40

-20

0

20

-140
0 20k

SSM MODE
P

OUT

= 5W
f = 1kHz
R

L

= 8Ω

UNWEIGHTED

OUTPUT FREQUENCY SPECTRUM

MAX9713 toc20

FREQUENCY (Hz)

OUTPUT MAGNITUDE (dB)

15k10k5k

-120

-100

-80

-60

-40

-20

0

20

0 20k

SSM MODE
P

OUT

= 5W
f = 1kHz
R

L

= 8Ω
A-WEIGHTED
RBW = 10kHz

0

-100
1M 10M 100M

WIDEBAND OUTPUT SPECTRUM

(FFM MODE)

-80

MAX1973toc21

FREQUENCY (Hz)

OUTPUT AMPLITUDE (dB)

-60

-40

-20

-30

-50

-70

-90

-10

RBW = 10kHz

0

-100
1M 10M 100M

WIDEBAND OUTPUT SPECTRUM

(SSM MODE)

-80

MAX9713toc22

FREQUENCY (Hz)

OUTPUT AMPLITUDE (dB)

-60

-40

-20

-30

-50

-70

-90

-10

SHUTDOWN SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX9713 toc25

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

18161412

0.10

0.05

0.15

0.20

0.25

0.30

0.35

0

10 20

TURN-ON/TURN-OFF RESPONSE

MAX9713 toc23

20ms/div

MAX9714

OUTPUT

1V/div

5V/divSHDN

f = 1kHz
R

L

= 8Ω

CSS = 180pF

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX9713 toc24

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

18161412

5

10

15

20

25

0

10 20

Typical Operating Characteristics (continued)

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