MAX98358ETE_技术文档

EVALUATION KIT AVAILABLE

Click here for production status of speciﬁc part numbers.

MAX98358

PDM Input Class D Audio Power Amplifier

General Description

Features

● Single-Supply Operation (2.5V to 5.5V)

The MAX98358 is a digital pulse-density modulated

(PDM) input Class D power amplifier that provides Class

AB audio performance with Class D efficiency. This IC

offers five selectable gain settings (3dB, 6dB, 9dB, 12dB,

and 15dB) set by a single gain-select input (GAIN). The IC

can be configured to produce a left channel, right channel,

or (left/2 + right/2) output from the stereo input data.

● 3.2W Output Power into 4Ω at 5V

● 1.8mA Quiescent Current (V

= 3.7V)

= 1.5W)

DD

OUT

● 92% Efficiency (R = 8Ω, P

L

● 29µV

Output Noise (A = 6dB)

V

RMS

● Low 0.013% THD+N at 1kHz

The MAX98358 takes a stereo pulse density modulated

(SPDM) input signal directly into the DAC. Data on the

rising edge of PDM_CLK is considered left-channel data

while data on the falling PDM_CLK edge is right channel.

A mono sum feature is also implemented with SPDM data

input by summing the data from both rising and falling

clock edges.

● Supported PDM_CLK Rates of 1.84MHz–4.32MHz

and 5.28MHz–8.64MHz

● Supports Left, Right, or Left/2 + Right/2 Outputs

● Sophisticated Edge Rate Control Enables Filterless

Class D Outputs

● 77dB PSRR at 217Hz

Active emissions-limiting, edge-rate limiting, and over-

shoot control circuitry greatly reduce EMI. A filterless

spread-spectrum modulation scheme eliminates the need

for output filtering found in traditional Class D devices and

reduces the component count of the solution.

● Low RF Susceptibility Rejects TDMA

Noise from GSM Radios

● Extensive Click-and-Pop Reduction Circuitry

● Robust Short-Circuit and Thermal Protection

The IC is available in 9-pin WLP (1.345mm x 1.435mm

x 0.64mm) and 16-pin TQFN (3mm x 3mm x 0.75mm)

packages and is specified over the -40°C to +85°C tem-

perature range.

● Available in Space-Saving Packages:

1.345mm x 1.435mm WLP (0.4mm Pitch)

3mm x 3mm TQFN

Applications

● Notebook and Netbook Computers

Simpliﬁed Block Diagram

● Cellular Phones

● Tablets

● Portable Media Players

SHUTDOWN

AND

CHANNEL

SELECT

GAIN

CONTROL

MAX98358

Ordering Information and Functional Diagram appears at

end of data sheet.

CLASS D

OUTPUT

STAGE

DIGITAL

AUDIO

INTERFACE

PDM

INPUT

DAC

19-6786; Rev 6; 10/19

MAX98358

PDM Input Class D Audio Power Ampliﬁer

TABLE OF CONTENTS

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Simplified Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Package Thermal Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Speaker Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Bump/Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Bump/Pin Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Detailed Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Digital Audio Interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Supported PDM_CLK Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

PDM_CLK Jitter Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

PDM Timing Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Standby Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

S D_M O D E Pin and Shutdown Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Class D Speaker Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Ultra-Low EMI Filterless Output Stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Speaker Current Limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Gain Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Click-and-Pop Suppression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Filterless Class D Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Power-Supply Input. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Layout and Grounding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

WLP Applications Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Functional Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Package Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Maxim Integrated

│ 2

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

LIST OF FIGURES

Figure 1. PDM Audio Interface Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Figure 2. PDM Digital Audio Interface Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Figure 3. SD_MODE Resistor Connection Using Open-Drain Driver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 4. SD_MODE Resistor Connection Using Push-Pull Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 5. EMI with 12in of Speaker Cable and No Output Filtering. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 6. Left-Channel Operation with 6dB Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 8. Right-Channel Operation with 6dB Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 7. Left-Channel Operation with 12dB Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 9. Stereo Operation Using Two MAX98358s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 10. Monomix (Left/2 + Right/2) PDM Operation with 6dB Gain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 11. MAX98358 WLP Ball Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

LIST OF TABLES

Table 1. PDM_CLK Channel Select. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 2. PDM_CLK Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 3. Calculated PDM_CLK Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 4. RMS Jitter Tolerance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 5. SD_MODE Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 6. Examples of SD_MODE Pullup Resistor Values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 7. Gain Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Maxim Integrated

│ 3

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Absolute Maximum Ratings

V

, PDM_CLK and PDM_DATA to GND ..............-0.3V to +6V

Continuous Power Dissipation ..............................(T = +70°C)

A

DD

All Other Pins to GND.............................. -0.3V to (V

+ 0.3V)

WLP (derate 13.7mW/°C above +70°C)....................1096mW

TQFN (derate 20.8mW/°C above +70°C)..................1666mW

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

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

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

Soldering Temperature (reflow).......................................+260°C

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

DD

Continuous Current In/Out of V /GND/OUT_..................±1.6A

DD

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

Duration of OUT_ Short Circuit to GND or V …....Continuous

DD

Duration of OUTP Short to OUTN.............................Continuous

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.

(Note 1)

Package Thermal Characteristics

WLP

TQFN

Junction-to-Ambient Thermal Resistance (θ ) ..........48°C/W

Junction-to-Ambient Thermal Resistance (θ ) ..........73°C/W

JA

Junction-to-Case Thermal Resistance (θ )...............50°C/W

Junction-to-Case Thermal Resistance (θ ).................7°C/W

JC

Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer

board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.

Electrical Characteristics

(V

= 5V, V

= 0V, GAIN = V

(+6dB). PDM_CLK = 3.072MHz, speaker loads (Z

) connected between OUTP and OUTN,

SPK

DD

GND

DD

Z

= ∞, T = T

to T

, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)

MAX A

SPK

A

MIN

PARAMETER

SYMBOL

CONDITIONS

MIN

2.5

TYP

MAX

5.5

2.3

2.7

2.2

2

UNITS

Supply Voltage Range

Undervoltage Lockout

V

Guaranteed by PSSR test

V

DD

UVLO

1.4

1.8

2.2

1.8

0.6

T

= +25°C

A

Quiescent Current

Shutdown Current

Standby Current

I

mA

µA

DD

= +25°C, V

= 3.7V

A

DD

I

SD_MODE = 0V, T = +25°C

SHDN

A

SD_MODE = 1.8V, no PDM_CLK,

I

340

400

STNDBY

T

= +25°C

A

Time from receipt of ﬁrst clock cycle to full

operation

Turn-On Time

t

0.6

±0.3

-72

0.7

ms

ON

Output Oﬀset Voltage

V

T

= +25°C, gain = 15dB

±2.5

mV

OS

A

Peak voltage, T

=

Into shutdown

A

+25°C, A-weighted,

32 samples per

second (Note 3)

Click-and-Pop Level

K

dBV

dB

CP

Out of shutdown

-66

V

= 2.5V to 5.5V, T = +25°C

60

75

77

DD

A

f = 217Hz,

Power-Supply Rejection Ratio

PSRR

200mV

P-P

ripple

T

= +25°C

A

(Notes 3, 4)

f = 10kHz,

60

200mV

P-P

Maxim Integrated

│ 4

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Electrical Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = V

(+6dB). PDM_CLK = 3.072MHz, speaker loads (Z

) connected between OUTP and OUTN,

SPK

DD

GND

DD

Z

= ∞, T = T

to T

, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)

MAX A

SPK

A

MIN

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

3.2

MAX

UNITS

Z

= 4Ω + 33µH

= 8Ω + 68µH

SPK

1.8

THD+N 10%

THD+N = 1%

= 8Ω + 68µH,

0.93

V

= 3.7V

DD

Output Power (Note 3)

P

W

OUT

Z

= 4Ω + 33µH

= 8Ω + 68µH

2.5

1.4

SPK

= 8Ω + 68µH,

0.77

0.02

0.013

99

V

= 3.7V

DD

f = 1kHz, P

= 1W, T = +25°C,

A

= 4Ω + 33µH (WLP)

OUT

0.06

Z

SPK

Total Harmonic Distortion +

Noise

f = 1kHz, P

= 1W, T = +25°C,

OUT A

THD+N

DR

%

Z

= 4Ω + 33µH (TQFN)

SPK

f = 1kHz, P

= 0.5W, T = +25°C,

A

OUT

Z

= 8Ω + 68FH

SPK

A-weighted, PDM_CLK = 6.144MHz,

= 2.54V

Dynamic Range

Output Noise

dB

V

RMS

V

A-weighted (Note 4)

GAIN = GND through 100kΩ

GAIN = GND

29

15

12

9

µV

RMS

N

14.4

11.4

8.4

15.6

12.6

9.6

Gain (Relative to a 2.1dBV

Reference Level)

A

GAIN = unconnected

dB

V

GAIN = V

5.4

6

6.6

DD

GAIN = V

through 100kΩ

2.4

3

3.6

Current Limit

I

2.8

A

LIM

h

Z

= 8Ω + 68µH, THD+N = 10%,

SPK

Eﬃciency

92

%

f = 1kHz, gain = 12dB

DAC Gain Error

1

%

Frequency Response

±0.5

330

±20

dB

Class D Oscillator Frequency

Spread-Spectrum Bandwidth

DIGITAL AUDIO INTERFACE

f

kHz

OSC

PDM_CLK High Frequency

Range

f

5.28

1.84

8.64

4.32

MHz

CLKH

PDM_CLK Low Frequency

Range

f

CLKL

PDM_CLK High Time

PDM_CLK Low Time

t

40

ns

PDM_CLKH

t

PDM_CLKL

Maximum Low-Frequency

PDM_CLK Jitter

RMS jitter below 40kHz

RMS jitter above 40kHz

0.5

12

ns

Maximum Low-Frequency

PDM_CLK Jitter

Maxim Integrated

│ 5

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Electrical Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = V

(+6dB). PDM_CLK = 3.072MHz, speaker loads (Z

) connected between OUTP and OUTN,

SPK

DD

GND

DD

Z

= ∞, T = T

to T

, unless otherwise noted. Typical values are at T = +25°C.) (Note 2)

MAX A

SPK

A

MIN

PARAMETER

SYMBOL

CONDITIONS

Digital audio inputs

= 0V, V = 5.5V, T = +25°C

MIN

TYP

MAX

UNITS

V

Input High Voltage

Input Low Voltage

Input Leakage Current

Input Capacitance

V

1.3

IH

V

0.6

+1

V

IL

I

, I

V

-1

µA

pF

IH IL

IN

DD

A

C

3

IN

Maximum

Minimum

75

25

PDM Ones Density

%

PDM_DATA to PDM_CLK

Setup Time

t

10

SETUP

ns

PDM_DATA to PDM_CLK

Hold Time

t

HOLD

SD_MODE COMPARATOR TRIP POINTS

B0

B1

B2

0.08

0.65

1.245

92

0.16

0.77

1.4

0.355

0.825

1.5

See SD_MODE and shutdown operation

for details

V

SD_MODE Pulldown Resistor

R

100

108

kΩ

PD

GAIN COMPARATOR TRIP POINTS

0.65 x

0.85 x

A

= 3dB gain

= 6dB gain

= 9dB gain

= 12dB gain

= 15dB gain

V

DD

0.9 x

V

DD

V

DD

0.4 x

0.6 x

V

DD

V

GAIN

V

DD

0.1 x

0

V

DD

0.15 x

0.35 x

V

DD

V

DD

Note 2: 100% production tested at T = +25°C. Specifications over temperature limits are guaranteed by design.

A

Note 3: Class D amplifier testing performed with a resistive load in series with an inductor to simulate an actual speaker load. For

R = 8Ω, L = 68µH. For RL = 4Ω, L = 33µH.

L

Note 4: Digital silence used for input signal.

Note 5: Dynamic range is measured using the EIJA method. -60dbFS 1kHz output signal. A-weighted and normalized to 0dBFS.

f = 20Hz to 20kHz.

Maxim Integrated

│ 6

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

t

PDM_CLK

t

PDM_CLKH

PDM_CLKL

PDM_CLK

t

HOLD

SETUP

HOLD

SETUP

PDM_DATA

LEFT

RIGHT

LEFT

RIGHT

Figure 1. PDM Audio Interface Timing Diagram

Typical Operating Characteristics

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z

) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

SHUTDOWN CURRENT

vs. SUPPLY VOLTAGE

QUIECENT CURRENT

vs. SUPPLY VOLTAGE

toc02

toc01

1.0

4.0

V_DDIO= 1.8V

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

2.5

3.0

3.5

4.0

4.5

5.0

5.5

SUPPLY VOLTAGE (V)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER

toc03

toc04

toc05

0

V_DD= 3.7V

Z_SPK= 8Ω + 68μH

V_DD= 4.2V

Z_SPK= 8Ω + 68μH

V_DD= 5V

Z_SPK= 8Ω + 68μH

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-20

-30

-40

-50

-60

-70

-80

-90

-100

-20

-30

-40

-50

-60

-70

-80

-90

-100

6kHz

1kHz

100Hz

1

0.001

0.01

0.1

1

10

0.001

0.01

0.1

10

0.001

0.01

0.1

1

10

OUTPUT POWER (W)

Maxim Integrated

│ 7

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Typical Operating Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT POWER

toc07

toc08

toc06

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

0

V_DD= 4.2V

Z_SPK= 4Ω + 33μH

V_DD= 5V

Z_SPK= 4Ω + 33μH

V_DD= 3.7V

Z_SPK= 4Ω + 33μH

-10

-20

-30

-40

-50

-60

-70

-80

-90

-20

-30

-40

-50

6kHz

-60

-70

-80

100Hz

1kHz

100Hz

1

-90

-100

0.001

0.01

0.1

1

10

0.001

0.01

0.1

1

10

0.01

0.1

10

OUTPUT POWER (W)

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT FREQUENCY

toc10

toc11

toc09

0

V_DD= 4.2V

Z_SPK= 8Ω + 68μH

V_DD= 5V

Z_SPK= 8Ω + 68μH

V_DD= 3.7V

Z_SPK= 8Ω + 68μH

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

-20

-30

-40

-50

-60

-70

-80

-90

-100

-20

-30

-40

-50

-60

-70

-80

-90

-100

P_OUT= 100mW

P_OUT= 850mW

P_OUT= 150mW

100

P_OUT= 75mW

P_OUT= 500mW

100

P_OUT= 350mW

100

10

1000

10000

100000

10

1000

10000

100000

10

1000

10000

100000

FREQUENCY (Hz)

Maxim Integrated

│ 8

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Typical Operating Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

TOTAL HARMONIC DISTORTION PLUS NOISE

vs. OUTPUT FREQUENCY

toc14

toc13

toc12

0

-10

-20

-30

-40

-50

-60

-70

-80

-90

-100

0

V_DD= 4.2V

Z_SPK= 4Ω + 33μH

V_DD= 5V

Z_SPK= 4Ω + 33μH

V_DD= 3.7V

Z_SPK= 4Ω + 33μH

-10

-20

-30

-40

-50

-60

-20

-30

-40

-50

-60

-70

-80

-90

P_OUT= 250mW

P_OUT= 1.5W

P_OUT= 150mW

-70

-80

P_OUT= 850mW

100

P_OUT= 350mW

P_OUT= 600mW

100

-90

-100

10

1000

10000

100000

10

100

1000

10000

100000

10

1000

10000

100000

FREQUENCY (Hz)

OUTPUT POWER vs.

LOAD RESISTANCE

OUTPUT POWER

vs. LOAD RESISTANCE

OUTPUT POWER vs.

LOAD RESISTANCE

toc16

toc18

toc15

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

2.5

2.0

1.5

1.0

0.5

0.0

V_DD= 4.2V

V_DD= 5V

V_DD= 3.7V

10% THD+N

1% THD+N

1

10

100

1

10

100

1

10

100

LOAD RESISTANCE

Maxim Integrated

│ 9

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Typical Operating Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

NORMALIZED GAIN

vs. FREQUENCY

OUTPUT POWER

vs. SUPPLY VOLTAGE

OUTPUT POWER

vs. SUPPLY VOLTAGE

toc20

toc19

3

toc18

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

2.5

NORMALIZED TO 1kHz

Z_SPK= 4Ω + 33µH

Z_SPK= 8Ω + 68µH

2

1

2.0

1.5

1.0

0.5

0.0

THD+N = 10%

0

THD+N = 1%

-1

-2

-3

10

100

1000

10000

100000

2.5

3.0

3.5

4.0

4.5

5.0

5.5

2.5

3.0

3.5

4.0

4.5

5.0

5.5

FREQUENCY (Hz)

SUPPLY VOLTAGE (V)

EFFICIENCY

vs. OUTPUT POWER

POWER DISSIPATION

vs. OUTPUT POWER

EFFICIENCY vs. OUTPUT POWER

toc22

toc21

toc23

100

90

80

70

60

50

40

30

20

10

0

100

90

80

70

60

50

40

30

20

10

0

0.20

Z_SPK= 8Ω + 68μH

0.18

0.16

0.14

0.12

0.10

0.08

0.06

0.04

0.02

0.00

V_DD= 5V

V_DD= 3.7V

V_DD= 4.2V

V_DD= 3.7V

V_DD= 4.2V

V_DD= 5V

V_DD= 4.2V

V_DD= 3.7V

Z_SPK= 8Ω + 68μH

0.0001

0.001

0.01

0.1

1

0.0

0.5

1.0

1.5

2.0

0.001

0.01

0.1

1

10

OUTPUT POWER (W)

Maxim Integrated

│ 10

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Typical Operating Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

POWER DISSIPATION

EFFICIENCY vs. OUTPUT POWER

vs. OUTPUT POWER

EFFICIENCY vs. OUTPUT POWER

toc25

toc26

toc24

100

90

80

70

60

50

40

30

20

10

0

0.50

100

Z_SPK= 4Ω + 33μH

0.45

90

80

70

60

50

40

30

20

10

0

V_DD= 5V

0.40

V_DD= 5V

V_DD= 4.2V

V_DD= 3.7V

0.35

0.30

V_DD= 3.7V

V_DD= 4.2V

V_DD= 5V

V_DD= 4.2V

0.25

0.20

0.15

0.10

V_DD= 3.7V

0.05

Z_SPK= 4Ω + 33μH

0.00

0.0001

0.001

0.01

0.1

1

0.001

0.01

0.1

1

10

0

1

2

3

OUTPUT POWER (W)

POWER-SUPPLY REJECTION RATIO

vs. SUPPLY VOLTAGE

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

TURN-ON RESPONSE

toc28

toc29

toc27

100

90

80

70

60

50

40

30

20

10

0

100

90

80

70

60

50

40

30

20

10

0

Z_SPK= 8Ω + 68µH

OUTPUT

1V/div

SD_MODE

1V/div

Z_SPK= 8Ω + 68µH

2ms/div

2.50

3.00

3.50

4.00

4.50

5.00

5.50

10

100

1000

10000

100000

SUPPLY VOLTAGE (V)

FREQUENCY (Hz)

Maxim Integrated

│ 11

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Typical Operating Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

INBAND OUTPUT SPECTRUM

TURN-OFF RESPONSE

toc31

toc32

20

0

20

toc30

f_PDMCLK= 6.144MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 6.144MHz

Z_SPK= 8Ω + 68μH

0

-20

OUTPUT

1V/div

-20

-40

-60

-80

SD_MODE

1V/div

-100

-120

-140

-100

-120

-140

1ms/div

0

5000

10000

15000

20000

0

5000

10000

15000

20000

FREQUENCY (Hz)

INBAND OUTPUT SPECTRUM

toc35

INBAND OUTPUT SPECTRUM

toc34

toc33

20

0

20

0

20

f_PDMCLK= 5.6448MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 5.6448MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 6.144MHz

Z_SPK= 8Ω + 68μH

0

-20

-40

-60

-80

-20

-40

-60

-80

-100

-120

-140

-100

-120

-140

-100

-120

-140

0

5000

10000

15000

20000

0

5000

10000

FREQUENCY (Hz)

15000

20000

0

5000

10000

FREQUENCY (Hz)

15000

20000

FREQUENCY (Hz)

Maxim Integrated

│ 12

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Typical Operating Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

INBAND OUTPUT SPECTRUM

toc38

toc37

toc36

20

0

20

f_PDMCLK= 3.072MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 3.072MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 5.6448MHz

Z_SPK= 8Ω + 68μH

0

-20

0

-20

-40

-60

-80

-20

-40

-60

-80

-100

-120

-140

-100

-120

-140

-100

-120

-140

0

5000

10000

15000

20000

0

5000

10000

15000

20000

0

5000

10000

FREQUENCY (Hz)

15000

20000

FREQUENCY (Hz)

INBAND OUTPUT SPECTRUM

toc41

INBAND OUTPUT SPECTRUM

toc40

toc39

20

0

20

0

20

0

f_PDMCLK= 2.8224MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 2.8224MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 3.072MHz

Z_SPK= 8Ω + 68μH

-20

-40

-60

-80

-100

-120

-140

-100

-120

-140

-100

-120

-140

0

5000

10000

FREQUENCY (Hz)

15000

20000

0

5000

10000

FREQUENCY (Hz)

15000

20000

0

5000

10000

15000

20000

FREQUENCY (Hz)

Maxim Integrated

│ 13

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Typical Operating Characteristics (continued)

(V

= 5V, V

= 0V, GAIN = GND (12dB). PDM_CLK = 3.072MHz, speaker loads (Z ) connected between OUTP and OUTN,

DD

GND

SPK

T

= T

to T , unless otherwise noted. Typical values are at T = +25°C.)

A

MIN

MAX A

INBAND OUTPUT SPECTRUM

toc44

toc43

toc42

20

0

20

f_PDMCLK= 2.048MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 2.048MHz

Z_SPK= 8Ω + 68μH

f_PDMCLK= 2.8224MHz

Z_SPK= 8Ω + 68μH

0

-20

0

-20

-40

-60

-80

-20

-40

-60

-80

-100

-120

-140

-100

-120

-140

-100

-120

-140

0

5000

10000

FREQUENCY (Hz)

15000

20000

0

5000

10000

15000

20000

0

5000

10000

FREQUENCY (Hz)

15000

20000

FREQUENCY (Hz)

GROUP DELAY vs. FREQUENCY

INBAND OUTPUT SPECTRUM

toc45

toc46

20

0

20

18

16

14

12

10

8

f_PDMCLK= 2.048MHz

Z_SPK= 8Ω + 68μH

-20

-40

-60

-80

6

-100

-120

-140

4

2

0

5000

10000

15000

20000

20

200

2000

20000

FREQUENCY (Hz)

Maxim Integrated

│ 14

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Bump/Pin Conﬁgurations

TOP VIEW

BUMP SIDE DOWN

TOP VIEW

MAX98358

12

11

10

9

+

SD_MODE

A1

V

OUTP

A3

DD

V

A2

13

14

N.C.

8

7

6

5

DD

PDM_DATA GAIN

OUTN

B3

GND

B1

B2

MAX98358

N.C.

GND 15

PDM_CLK

C1

GND

C2

GND

C3

16

PDM_CLK

+

1

2

3

4

WLP

TQFN

Bump/Pin Description

BUMP

NAME

FUNCTION

WLP

TQFN

Shutdown and Channel Select. Determines left, right, or (left/2 + right/2) mix and also used for

shutdown. See Table 5.

A1

4

SD_MODE

A2

A3

B1

7, 8

9

V

Power-Supply Input

DD

OUTP

Positive Speaker Ampliﬁer Output

1

PDM_DATA Digital Input Signal

Ampliﬁer Gain

Gain Connections

Gain (dB)

GND through 100kΩ resistor

GND

15

12

9

B2

2

GAIN

Unconnected

V

6

DD

V

through 100kΩ resistor

3

DD

B3

C1

10

16

OUTN

Negative Speaker Ampliﬁer Output

PDM Bit Clock Input Signal. Supports frequency ranges: 1.84MHz–4.32MHz and 5.28 MHz–

8.64MHz.

PDM_CLK

3, 11,

14, 15

C2, C3

—

GND

N.C.

EP

Ground

5, 6,

12, 13

No Connection

Exposed Pad. The exposed pad is not internally connected. Connect the exposed pad to a solid

ground plane for thermal dissipation.

—

Maxim Integrated

│ 15

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

The output stage features low-quiescent current, com-

prehensive click-and-pop suppression, and excellent RF

immunity. The IC offers Class AB audio performance with

Class D efficiency in a minimal board-space solution. The

Class D amplifier features spread-spectrum modulation

with edge-rate and overshoot control circuitry that offers

significant improvements in switch-mode amplifier radi-

ated emissions. The amplifier features click-and-pop sup-

pression that reduces audible transients on startup and

shutdown. The amplifier includes thermal-overload and

short-circuit protection.

Detailed Description

The MAX98358 is a digital PDM input Class D power

amplifier. The PDM modulation scheme uses the relative

density of digital pulses to represent the amplitude of an

analog signal. The IC accepts stereo PDM data through

PDM_DATA and PDM_CLK.

SD_MODE selects which audio channel is output by the

amplifier and is used to put the IC into shutdown. The

GAIN pin offers five gain settings and allows the output of

the amplifier to be tuned to the appropriate level.

Digital Audio Interface

The IC takes a stereo PDM input signal directly into the

DAC. Data read on the rising edge of PDM_CLK is left-

channel data while data read on the falling PDM_CLK

edge is right channel (Table 1).

Table 1. PDM_CLK Channel Select

PDM_CLK EDGE

CHANNEL

DIRECTION

Rising edge

Falling edge

Left

Supported PDM_CLK Rates

Right

Table 2 indicates the range of PDM_CLK rates that are

supported by the IC. Table 3 indicates the specific clock

rates to use based on the baseband rate and the overs-

ample rate of the incoming PDM signal.

Table 2. PDM_CLK Rates

SUPPORTED CLOCK RATES (MHz)

PDM_CLK Jitter Tolerance

1.84–4.32

5.28–8.64

The IC features a very high PDM_CLK jitter tolerance of

0.5ns for RMS jitter below 40kHz and 12ns for wideband

RMS jitter while maintaining a dynamic range greater than

98dB (Table 4).

Table 3. Calculated PDM_CLK Rates

INPUT CLOCK RATES (MHz)

BASEBAND SAMPLE

32x OVERSAMPLED

64x OVERSAMPLED

PDM

128x OVERSAMPLED

PDM

256x OVERSAMPLED

PDM

RATE (kHz)

PDM

8

16

—

2.048

4.096

5.6448*

6.144*

—

2.048

4.096

—

32

—

2.048

2.8224

3.072

5.6448*

6.144*

44.1

48

—

88.2

96

2.8224

3.072

—

*The mono left/2 + right/2 feature is not supported at PDM_CLK rates of 5.28MHz and above.

Table 4. RMS Jitter Tolerance

FREQUENCY

< 40kHz

RMS JITTER TOLERANCE (ns)

0.5

12

40kHz–PDM_CLK

Maxim Integrated

│ 16

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

PDM Timing Characteristics

SD_MODE Pin and Shutdown Operation

Figure 2 shows the PDM operation of the IC. The bit-

depth is one bit and each bit alternates between left-

channel and right-channel data.

The IC features a low-power shutdown mode, drawing

less than 0.6µA (typ) of supply current. During shutdown,

all internal blocks are turned off, including setting the

output stage to a high-impedance state. Drive SD_MODE

low to put the IC into shutdown.

If the PDM generator produces data that is stuck at logic-

high or logic-low, then the output of the IC is railed, forc-

ing DC at the load. Therefore, it is recommended that the

PDM generator includes protection to detect this invalid

condition. If such a condition is detected, then the IC

should either be put into shutdown or PDM_CLK should

be stopped.

The state of SD_MODE determines the audio channel

that is sent to the amplifier output (Table 5).

Drive SD_MODE high to select the left channel of the

stereo input data. Drive SD_MODE high through a suf-

ficiently small resistor to select the right channel of

the stereo input data. Drive SD_MODE high through a

sufficiently large resistor to select monomix mode where

both the left and right words of the stereo input data are

summed (left/2 + right/2). The monomix (left/2 + right/2)

mode is not supported for PDM_CLK rates 5.28MHz.

and above. RLARGE and RSMALL are determined by

the VDDIO voltage (logic voltage from control interface)

that is driving SD_MODE according to the following two

equations:

Standby Mode

The MAX98358 automatically enters standby mode when

PDM_CLK is removed. In standby mode, the Class D

speaker amplifier is turned off and the outputs go into

a high-impedance state, ensuring that the unwanted

current is not transferred to the load during this condi-

tion. Standby mode should not be used in place of the

shutdown mode because the shutdown mode provides

the lowest power consumption and the best power-on/off

click-and-pop performance.

R

(kΩ) = 94.0 x VDDIO - 100

(kΩ) = 222.2 x VDDIO - 100

SMALL

R

LARGE

SD_MODE = LOGIC-HIGH

PDM_CLK

PDM_DATA

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

L

R

RIGHT CHANNEL IGNORED

SD_MODE = PULLUP THROUGH R

PDM_CLK

SMALL

PDM_DATA

L

R

L

R

L

R

L

R

L

R

LEFT CHANNEL IGNORED

SD_MODE = PULLUP THROUGH R

PDM_CLK

LARGE

PDM_DATA

L

R

L

R

L

R

L

R

L

R

LEFT AND RIGHT CHANNELS AVERAGED

Figure 2. PDM Digital Audio Interface Timing

Table 5. SD_MODE Control

SD_MODE STATUS

SELECTED CHANNEL

High

V

> B2 trip point

Left

SD_MODE

B2 trip point (1.4V typ) > V

B1 trip point

>

SD_MODE

Pullup through R

Right

SMALL

B1 trip point (0.77V typ) > V

B0 trip point

>

SD_MODE

Pullup through R

Low

*

(Left/2 + right/2)

Shutdown

LARGE

B0 trip point (0.16V typ) > V

SD_MODE

Maxim Integrated

│ 17

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Figure 3 and Figure 4 show how to connect an external

resistor to SD_MODE when using an open-drain driver or

a pullup/down driver.

Gain Selection

The IC offers five programmable gain selections through

a singel gain input (GAIN). Gain is referenced to the

full-scale output of the DAC, which is 2.1dBV (Table 7).

Assuming that the desired output swing is not limited by

the supply voltage rail, the IC’s output level can be calcu-

lated based on the PDM input ones’s density and selected

amplifier gain according to the following equation:

When the device is configured in left channel mode

(SD_MODE is directly driven to logic-high by the con-

trol interface) care must be taken to avoid violating

the Absolute Maximum Ratings limits for SD_MODE.

Ensuring that V

is always greater than V

is one

DD

DDIO

way to prevent SD_MODE from violating the Absolute

Output signal level (dBV) = 20 x log[abs(PDM one’s

density(%) - 50) /25] (dBFS) + 2.1dB + selected

speaker amplifier gain (dB)

Maximum Ratings limits. If this is not possible in the

application (e.g., if V

< 3.0V and V

= 3.3V), then

DD

DDIO

it is necessary to add a small resistance (~2kΩ) in series

with SD_MODE to limit the current into the SD_MODE

pin. This is not a concern when using the right channel or

monomix modes.

where the one’s density of the PDM input ranges from

75% (maximum positive magnitude) to 25% (maximum

negative magnitude). 0dFBS is referenced to 0dBV.

Class D Speaker Ampliﬁer

Click-and-Pop Suppression

The filterless Class D amplifier offers much higher effi-

ciency than Class AB amplifiers. The high efficiency of

a Class D amplifier is due to the switching operation of

the output stage transistors. Any power loss associated

with the Class D output stage is mostly due to the I2R

loss of the MOSFET on-resistance and quiescent current

overhead.

The IC speaker amplifier features Maxim’s compre-

hensive click-and-pop suppression. During startup, the

click-and-pop suppression circuitry reduces audible tran-

sient sources internal to the device. To achieve optimal

click-and-pop reduction at startup, it is recommended

that idle data be sent to the digital audio interface for the

first 0.5ms of turn-on time. When entering shutdown, the

differential speaker outputs simultaneously drop to GND.

Ultra-Low EMI Filterless Output Stage

Traditional Class D amplifiers require the use of external

LC filters, or shielding, to meet EN55022B electromagnet-

ic-interference (EMI) regulation standards. Maxim’s active

emissions-limiting edge-rate control circuitry and spread-

spectrum modulation reduces EMI emissions while main-

taining up to 92% efficiency.

Table 6. Examples of SD_MODE Pullup

Resistor Values

LOGIC VOLTAGE

R

(kΩ)

R

(kΩ)

SMALL

LARGE

LEVEL (V

) (V)

DDIO

1.8

3.3

69.8

210

300

634

Maxim’s spread-spectrum modulation mode flattens wide-

band spectral components while proprietary techniques

ensure that the cycle-to-cycle variation of the switching

period does not degrade audio reproduction or efficiency.

The ICs’ spread-spectrum modulator randomly varies the

switching frequency by ±20kHz around the center fre-

quency (330kHz). Above 10MHz, the wideband spectrum

looks like noise for EMI purposes (Figure 5).

Table 7. Gain Selection

GAIN

GAIN (dB)

Connect to GND through

100kΩ ±5% resistor

15

Speaker Current Limit

Connect to GND

Unconnected

12

9

If the output current of the speaker amplifier exceeds the

current limit (2.8A typ), the IC disables the outputs for

approximately 100µs. At the end of the 100µs, the outputs

are re-enabled. If the fault condition still exists, the IC con-

tinues to disable and re-enable the outputs until the fault

condition is removed.

Connect to V

6

DD

Connect to V

through

DD

3

100kΩ ±5% resistor

Maxim Integrated

│ 18

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

V

DDIO

PROCESSOR

GPIO

LEFT MODE

B2 (1.4V typ)

MAX98358

R

V

SD_MODE

RIGHT MODE

B1 (0.77V typ)

100kΩ

±8%

LEFT/2 + RIGHT/2 MODE

B0 (0.16V typ)

Figure 3. SD_MODE Resistor Connection Using Open-Drain Driver

PROCESSOR

V

DDIO

LEFT MODE

B2 (1.4V typ)

MAX98358

R

V

SD_MODE

GPIO

RIGHT MODE

B1 (0.77V typ)

100kΩ

±8%

LEFT/2 + RIGHT/2 MODE

B0 (0.16V typ)

Figure 4. SD_MODE Resistor Connection Using Push-Pull Driver

90

70

50

30

10

-10

0

100 200 300 400 500 600 700 800 900 1000

FREQUENCY (MHz)

Figure 5. EMI with 12in of Speaker Cable and No Output Filtering

Maxim Integrated

│ 19

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

2.5V TO 5.5V

10µF

0.1µF

10µF

0.1µF

CODEC

GPIO*

V

GAIN

B2

DD

V

GAIN

B2

DD

SD_MODE

PDM_CLK

PDM_DATA

A2

SD_MODE

PDM_CLK

PDM_DATA

A2

GPIO*

PDM CLOCK

A1

C1

B1

A1

C1

B1

OUTP

OUTN

OUTP

OUTN

A3

MAX98358

PDM CLOCK

B3

PDM DATA OUT

C2, C3

GND

C2, C3

GND

*RESPONDS TO LEFT CHANNEL WHEN GPIO IS HIGH.

THE MAX98358 IS SHUTDOWN WHEN GPIO IS LOW.

*RESPONDS TO LEFT CHANNEL WHEN GPIO IS HIGH.

THE MAX98358 IS SHUTDOWN WHEN GPIO IS LOW.

Figure 6. Left-Channel Operation with 6dB Gain

Figure 7. Left-Channel Operation with 12dB Gain

2.5V TO 5.5V

10µF

0.1µF

CODEC

R

SMALL

V

GAIN

B2

DD

(69.8kΩ)**

SD_MODE

PDM_CLK

A2

A1

C1

GPIO*

OUTP

OUTN

A3

B3

PDM CLOCK

MAX98358

PDM_DATA B1

PDM DATA OUT

C2, C3

GND

*RESPONDS TO RIGHT CHANNEL WHEN GPIO IS HIGH.

**69.8kΩ ASSUMES V = 1.8V.

GPIO

THE MAX98358 IS SHUTDOWN WHEN GPIO IS LOW.

Figure 8. Right-Channel Operation with 6dB Gain

Maxim Integrated

│ 20

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

2.5V TO 5.5V

10µF

0.1µF

GAIN

V

DD

B2

A2

SD_MODE

PDM_CLK

PDM_DATA

A1

C1

B1

OUTP

OUTN

A3

MAX98358

B3

C2

GND

CODEC

GPIO*

*RESPONDS TO LEFT CHANNEL WHEN GPIO IS HIGH.

THE MAX98358 IS SHUTDOWN WHEN GPIO IS LOW.

2.5V TO 5.5V

PDM CLOCK

10µF

0.1µF

PDM DATA OUT

R

SMALL

V

DD

GAIN

(69.8kΩ)**

SD_MODE

PDM_CLK

PDM_DATA

B2

A2

A1

C1

B1

OUTP

OUTN

A3

B3

MAX98358

C2, C3

GND

*RESPONDS TO RIGHT CHANNEL WHEN GPIO IS HIGH.

**69.8kΩ ASSUMES V = 1.8V.

GPIO

THE MAX98358 IS SHUTDOWN WHEN GPIO IS LOW.

Figure 9. Stereo Operation Using Two MAX98358s

Maxim Integrated

│ 21

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Filterless Class D Operation

WLP Applications Information

Traditional Class D amplifiers require an output filter

to recover the audio signal from the amplifier’s output.

The filter adds cost, size, and decreases efficiency and

THD+N performance. The MAX98358’s filterless modula-

tion scheme does not require an output filter. The device

relies on the inherent inductance of the speaker coil and

the natural filtering of both the speaker and the human ear

to recover the audio component of the square-wave output.

For the latest application details on WLP construction,

dimensions, tape carrier information, PCB techniques,

bump-pad layout, and recommended reflow temperature

profile, as well as the latest information on reliability testing

results, refer to the Application Note 1891: Wafer-Level

Packaging (WLP) and Its Applications. Figure 11 shows

the dimensions of the WLP balls used on the IC.

Because the switching frequency of the IC is well beyond

the bandwidth of most speakers, voice coil movement due

to the switching frequency is very small. Use a speaker

with a series inductance > 10µH. Typical 8Ω speakers

exhibit series inductances in the 20µH to 100µH range.

2.5V TO 5.5V

10µF

0.1µF

CODEC

GPIO*

R

LARGE

(300kΩ)**

V

DD

GAIN

B2

A2

Power-Supply Input

SD_MODE

PDM_CLK

PDM_DATA

A1

C1

B1

OUTP

OUTN

V

DD

, which ranges from 2.5V to 5.5V, powers the IC,

A3

B3

including the speaker amplifier. Bypass V

with a 0.1µF

DD

MAX98358

PDM CLOCK

and 10µF capacitor to GND. Some applications might

require only the 10µF bypass capacitor, making it pos-

sible to operate with a single external component. Apply

additional bulk capacitance at the IC if long input traces

PDM DATA OUT

C2, C3

GND

between V

and the power source are used.

DD

*LEFT AND RIGHT ARE SUMMED WHEN GPIO IS HIGH.

**300kΩ ASSUMES V = 1.8V.

GPIO

THE MAX98358 IS SHUTDOWN WHEN GPIO IS LOW.

Layout and Grounding

Proper layout and grounding are essential for optimum

performance. Good grounding improves audio perfor-

mance and prevents switching noise from coupling into

the audio signal.

Figure 10. Monomix (Left/2 + Right/2) PDM Operation with 6dB

Gain

Use wide, low-resistance output traces. As load imped-

ance decreases, the current drawn from the device

outputs increases. At higher current, the resistance of

the output traces decreases the power delivered to the

load. For example, if 2W is delivered from the speaker

output to a 4Ω load through 100mΩ of total speaker

trace, 1.904W is being delivered to the speaker. If power

is delivered through 10mΩ of total speaker trace, 1.951W

is being delivered to the speaker. Wide output, supply,

and ground traces also improve the power dissipation of

the IC. Parasitic capacitance on the output causes higher

0.24mm

quiescent current by V

x 330kHz x C

.

DD

PARASITIC

For example, at V

and a total parasitic capacitance of

DD

100pF (50pF on each output trace), the increase in quies-

cent current is: 5 x 330kHz x 100pF = 165µA.

0.21mm

The IC is inherently designed for excellent RF immunity.

For best performance, add ground fills around all signal

traces on top or bottom PCB planes.

Figure 11. MAX98358 WLP Ball Dimensions

Maxim Integrated

│ 22

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Functional Diagram

2.5V TO 5.5V

10µF

0.1µF

V

DD

GAIN

A2

(7, 8)

B2

(2)

MAX98358

C1

(9)

A3

OUTP

OUTN

PDM_CLK

PDM_DATA

SD_MODE

(16)

DIGITAL

AUDIO

INTERFACE

CLASS D

OUTPUT

STAGE

DAC

B3

(10)

(1)

B1

A1 (3)

(3, 11, 14, 15)

C2, C3

GND

() APPLIES TO TQFN PACKAGE

Ordering Information

PART

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

9 WLP

MAX98358EWL+T

MAX98358ETE+

16 TQFN

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Maxim Integrated

│ 23

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Package Information

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,

“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

PACKAGE TYPE

9 WLP

PACKAGE CODE

W91F1+1

OUTLINE NO.

21-0896

LAND PATTERN NO.

Refer to Application Note 1891

90-0031

16 TQFN

T1633+4

21-0136

0.05 S

maxim

TM

integrated

0.05

AB

Maxim Integrated

│ 24

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Package Information (continued)

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,

“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

(NE - 1)

X e

MARKING

E

E/2

D2/2

(ND - 1)

e

X e

D/2

AAAA

C

D2

D

L

k

b

0.10 M

C A B

C

L

E2/2

L

E2

C

L

C

L

0.10

C

0.08

C

A

A2

A1

L

e

maxim

integratedTM

PACKAGE OUTLINE,

8, 12, 16L THIN QFN, 3x3x0.75mm

1

21-0136

V

3

Maxim Integrated

│

25

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Package Information (continued)

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,

“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

PKG

8L 3x3

12L 3x3

16L 3x3

EXPOSED PAD VARIATIONS

REF. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX.

D2

E2

PKG.

PIN ID

JEDEC

A

b

0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80

0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30

CODES

MAX.

NOM.

MAX.

MIN. NOM.

MIN.

0.25

0.95

0.65

0.95

TQ833-1

T1233-1

0.70 1.25

1.10 1.25

0.80 0.95

1.10 1.25

0.70 1.25

0.25

0.95

0.65

0.35 x 45°

WEEC

D

3.00 BSC

1.10

0.80

1.10

1.25

0.95

1.25

WEED-1

WEED-2

E

e

3.00 BSC

0.65 BSC.

3.00 BSC

0.50 BSC.

3.00 BSC

0.50 BSC.

T1233-1C

T1233-3

0.35 0.55 0.75 0.45 0.55 0.65 0.30 0.40 0.50

L

N

T1233-3C

T1633-2

8

12

16

ND

NE

A1

A2

k

2

3

4

T1633-2C

T1633F-3

2

3

4

0.225 x 45° WEED-2

0

0.02 0.05

0

0.02 0.05

0

0.02 0.05

T1633FH-3 0.65

0.20 REF

T1633-4

0.95

-

0.35 x 45°

WEED-2

0.25

T1633-4C

T1633MK-5 0.95

EXPOSED PAD VARIATIONS

D2

MIN. NOM.

E2

L

PKG.

PIN ID

CODES

MAX.

1.25

NOM.

1.10

MIN.

0.95

MAX.

1.25

NOM.

MIN.

0.35

MAX.

0.35 x 45°

T1233-4

1.10

0.95

0.45 0.55

0.45

0.35 x 45°

T1233-4C

T1233-5C

1.10

1.60

1.25

1.70

0.95

1.50

1.10

1.60

0.95

1.50

1.25

1.70

0.35

0.40

0.55

0.45 0.50

0.35 0.45

0.35 x 45°

1.25

0.25

T1633-5

0.95

1.10 1.25

0.95

1.10

T1633-5C

T1633-7C

maxim

integratedTM

PACKAGE OUTLINE,

8, 12, 16L THIN QFN, 3x3x0.75mm

2

21-0136

V

3

Maxim Integrated

│

26

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Package Information (continued)

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,

“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

NOTES:

1. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.

2. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5-2009.

3. N IS THE TOTAL NUMBER OF TERMINALS.

4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF

TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER

MAY BE EITHER A MOLD OR MARKED FEATURE.

5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.20 mm AND 0.25 mm FROM TERMINAL TIP.

6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.

7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.

8. DRAWING CONFORMS TO JEDEC MO220 REVISION C. T1233-4, T1233-4C, T1233-5C, T1633-5, T1633-5C AND T1633-7C WITH

CUSTOM LEAD DIMENSION.

9. MARKING SHOWN IS FOR PACKAGE ORIENTATION REFERENCE ONLY.

10. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.

11. WARPAGE NOT TO EXCEED 0.10mm.

12. MATERIAL MUST BE COMPLIANT WITH MAXIM SPECIFICATION 10-0131 FOR SUBSTANCE CONTENT, MUST BE Eu ROHS

COMPLIANT WITHOUT EXEMPTION AND PB-FREE.

13. ALL DIMENSIONS APPLY TO BOTH LEADED (-) AND Pb FREE (+) PARTS.

maxim

integratedTM

PACKAGE OUTLINE,

8, 12, 16L THIN QFN, 3x3x0.75mm

3

21-0136

V

3

Maxim Integrated

│

27

www.maximintegrated.com

MAX98358

PDM Input Class D Audio Power Ampliﬁer

Revision History

REVISION REVISION

PAGES

DESCRIPTION

CHANGED

NUMBER

DATE

0

1

2

9/13

Initial release

—

11/13

8/14

Removed future product reference

21

Added THD+N TQFN typical only spec to Electrical Characteristics table

3

5–12, 16–18

24

Added Table of Contents, updated SSM spec, replaced all typical operating

characteristics, and corrected typos

3

4

5

1/15

8/15

8/17

Corrected package outline for WLP package

Updated soldering temperature and added lead temperature in the Absolute Maximum

Ratings section

4

Updated Features section, corrected typo in Electrical Characteristics table, added

Group Delay vs. Frequency TOC

6

10/19

1, 5, 14

For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and speciﬁcations without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

©

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

2019 Maxim Integrated Products, Inc.

│ 28


型号：	MAX98358ETE
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	PDM Input Class D Audio Power Amplifier 光电二极管
文件：	总28页 (文件大小：1878K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX98358ETE [MAXIM]

相关型号：

SI9130DB

SI9135LG-T1

SI9135LG-T1-E3

SI9135_11

SI9136_11

SI9130CG-T1-E3

SI9130LG-T1-E3

SI9130_11

SI9137

SI9137DB

SI9137LG

SI9122E