MAX98371EWV+

MAX98371EWV+ Datasheet

MAX98371

Part	Datasheet
MAX98371EWV+	MAX98371EWV+ (pdf)

PDF Datasheet Preview
MAX98371 EVALUATION KIT AVAILABLE Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking The MAX98371 is a high-efficiency, mono Class D audio amplifier featuring Dynamic Headroom Tracking DHT . DHT automatically optimizes the headroom available to the Class D amplifier as the power supply voltage varies, due to sudden transients and declining battery life to maintain a consistent listening experience. A wide 5.5V to 18V supply range allows the device to reach 19W into an load. The MAX98371’s flexible digital audio interface DAI supports I2S, Left-Justified, and TDM formats. The digital audio interface accepts 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz sample rates with 16-/24-/32-bit data supported for all data formats. In TDM mode, the device can support up to 16 channels of audio data. A unique clocking structure eliminates the need for an external MCLK signal that is typically needed for PCM communication. This reduces pin count and simplifys board layout. Active Emissions Limiting AEL with edge rate control minimizes EMI, and eliminates the need for output filtering found in traditional Class D devices. An 8-bit PVDD supply voltage ADC enables the Dynamic Headroom Tracking circuit. DHT optimizes audio program peak behavior as the supply voltage varies and provides flexible user-defined parameters. Thermal foldback protection ensures robust behavior when the thermal limits of the device are exercised. The circuit can be enabled to automatically reduce the output power above a user specified temperature. This allows for uninterrupted music playback even at high ambient temperatures. Traditional thermal protection is also available in addition to robust overcurrent protection. All MAX98371 control is performed using a standard 2-wire, I2C interface. One of sixteen slave addresses can be selected through two, four-level address pins. The IC is available in a 0.4mm pitch, 30-bump WLP package. It is specified over the extended, -40°C to +85°C temperature range. ●● Tablets ●● Notebook Computers ●● Soundbars Benefits and Features ●● Wide Supply Range 5.5V to 18V ●● Dynamic Headroom Tracking Maintains a Consistent Listening Experience ●● Integrated Thermal Foldback Allows Robust Operation in a WLP Package ●● Remote Output Sensing Allows Up to 20dB THD+N Improvement When Ferrites Are Used ●● Class D Edge Rate Control Enables Filterless Operation ●● 110dB A-Weighted Dynamic Range ●● Output Power at 1% THD+N: • 15.7W into 8Ω, VPVDD = 17V • 13.2W into 4Ω, VPVDD = 12V ●● Output Power at 10% THD+N • 19W into 8Ω, VPVDD = 17V • 15.8W into 4Ω, VPVDD = 12V ●● Speaker Amplifier Efficiency • 91% at 10W into 8Ω, VPVDD = 12V • 81% at 15W into 4Ω, VPVDD = 12V ●● Extensive Click-and-Pop Suppression ●● Space Saving, 30-Bump WLP Package 2.1mm x 2.6mm x 0.6mm, 0.4mm Pitch Simplified Block Diagram Ordering Information appears at end of data sheet. MAX98371 Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking TABLE OF CONTENTS General Description 1 Applications 1 Benefits and Features 1 Simplified Block Diagram 1 Detailed Functional Diagram 6 Absolute Maximum Ratings 7 Package Thermal Characteristics 7 Electrical Characteristics 7 I2C Timing Characteristics 14 Power Consumption 15 Typical Operating Characteristics 16 Pin Configurations 23 Pin Description 24 Detailed Description 25 Interrupts 29 Status 29 State 29 Flag 29 Enable 29 Clear 29 Digital Audio Interface 40 Interface Format 41 Configuring the DAI Format 41 Configuring the Digital Audio Input 42 Digital Passband Filtering 47 Biquad Filter 48 Signal Path Delay 48 PVDD ADC 49 Digital Volume Control 49 Output Voltage Scaling 50 Dynamic Headroom Tracking 51 DHT Ballistics 58 Limiter 61 Maxim Integrated 2 MAX98371 Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking TABLE OF CONTENTS continued Thermal ADC 61 Thermal Protection 61 Thermal Foldback 62 DOUT Operation and Data format 63 Interchip Communication 65 Multiamplifier Grouping 65 Double Data Drive 66 Class D Output Stage 71 Maxim Integrated 3 MAX98371 Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking LIST OF FIGURES Figure I2S Audio Interface Timing Diagram 13 Figure Left-Justified Audio Interface Timing Diagram 13 Figure 3.TDM Audio Interface Timing Diagrams 13 Figure I2C Interface Timing Diagram 14 Figure I2S Digital Audio Format Examples 44 Figure Left-Justified Digital Audio Format Examples 45 Figure TDM Digital Audio Format Examples 46 Figure Example of Dynamic Headroom Tracking in Mode 1 Operation 51 Figure Example of Dynamic Headroom Tracking in Mode 2 Operation with a High RP 52 Figure Example of Dynamic Headroom Tracking in Mode 2 Operation with a Low RP 53 Figure Example of Dynamic Headroom Tracking in Mode 3a Operation 55 Figure Example of Dynamic Headroom Tracking in Mode 3b Operation 56 Figure Example of Dynamic Headroom Tracking in Mode 3b with Limiter. 57 Figure Dynamic Headroom Tracking Attack functionality 58 Figure Thermal Foldback performance 63 Figure DOUT data structure 64 Figure Single Data Drive 66 Figure Double Data Drive illustration 66 Figure Typical Application Circuit with Ferrites Beads Used 72 Figure 20 .THD Performance Improvement Enabled by Remote Sensing 72 Figure START, STOP, and REPEATED START Conditions 74 Figure Acknowledge 75 Figure Writing One Byte of Data to the MAX98371 75 Figure n-Bytes of Data to the MAX98371 75 Figure Reading One Byte of Data from the MAX98371 76 Figure Reading n-Bytes of Data from the MAX98371 76 Figure MAX98371+ WLP Ball Dimensions 78 LIST OF TABLES Table MAX98371 Control Register Map 25 Table Interrupt Sources 29 Table Interrupt Registers 30 Table Supported Sample Rates 40 Table Supported BCLK Rates in Slave Mode 40 Table Configuration for Digital Audio Interface Format 41 Maxim Integrated 4 MAX98371 Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking LIST OF TABLES CONTINUED Table Configuration for Digital Audio Interface Format 42 Table TDM Channel Selection for Mono Replay 44 Table Digital Highpass Filter 47 Table Biquad Filter Coefficient Registers 48 Table Signal Path Delay 48 Table PVDD Measurement ADC 49 Table Digital Volume Ramping and Digital Volume 49 Table Digital Gain Settings and Output Voltage Scaling 50 Table Speaker Gain Minimum Voltage 54 Table Dynamic Headroom Tracking Attack Settings 59 Table Dynamic Headroom Tracking Release Settings 60 Table Dynamic Gain Enables 60 Table Limiter Threshold Select 60 Table Manual Limiter Threshold Settings 61 Table Limiter Threshold 61 Table Limiter Attack and Release Settings 62 Table Thermal ADC Measurements 62 Table Thermal Foldback Settings 63 Table Thermal Foldback Enable 63 Table DHT INFO 64 Table Thermal and DHT Link Enables 64 Table THERM INFO 64 Table InterChip Communication Configuration 65 Table DOUT Double Data Drive Mode 66 Table DOUT DHT Receive Channel Configuration 67 Table DOUT Thermal Foldback Receive Channel Configuration 68 Table DOUT Thermal Foldback Receive Channel Configuration 69 Table Extra BCLK Cycle Configuration 70 Table Manual HIZ Mode Configuration 70 Table Speaker Configuration 71 Table Clock Monitor Configuration 73 Table Reset Register 73 Table Global Enable Register 73 Table ADDR I2C Address Select 77 Table Recommended External Components 78 Maxim Integrated 5 MAX98371 Detailed Functional Diagram Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking Maxim Integrated 6 MAX98371 Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking Absolute Maximum Ratings PVDD to 20V OUT_ to -0.3V to VPVDD + 0.3V VREFC to 2.2V DVDD to 2.2V SDA, SCL, ADDR_, IRQ to DGND..........................-0.3V to 2.2V BCLK, LRCLK, DIN, RESET to DGND ...............................-0.3V to VDVDD + 0.3V AGND, DGND to PGND to 0.1V Short-Circuit Duration Between OUTP, OUTN and PGND or PVDD.........Continuous Between OUTP and OUTN Continuous Power Dissipation TA = +70°C for Multilayer Board derate 27mW/°C above Junction 150°C Operating Temperature to 85°C Storage Temperature to 150°C Soldering Temperature 260°C 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. Package Thermal Characteristics Note 1 Junction-to-Ambient Thermal Resistance 37°C/W Junction-to-Board Thermal Resistance 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 Electrical Characteristics VPVDD = 12V, VDVDD = RESET = 1.8V, VGND = 0V, CPVDD = 1x 220µF, 2x 10µF, 2x 0.1µF, CREFC = 1µF, CDVDD = 1µF, ZSPK = open, AC measurement bandwidth 20Hz to 22kHz, fS = 48kHz, 24-bit data, TA = TMIN to TMAX, unless, otherwise noted. Typical values are at TA = +25°C. Note 2 PARAMETER CONDITION MAX UNITS Power Supply Voltage Range VREFC Regulator Output VPVDD VDVDD VREFC PVDD Under Voltage Lockout PVDD UVLO DVDD Under Voltage Lockout DVDD UVLO Ordering Information PART TEMP RANGE PIN-PACKAGE MAX98371EWV+T -40°C to +85°C 30 WLP MAX98371EWV+ -40°C to +85°C 30 WLP +Denotes a lead Pb -free/RoHS-compliant package. T = Tape and reel. Package Information For the latest package outline information and land patterns footprints , go to 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 30-WLP PACKAGE CODE W302E2+1 OUTLINE NO. 21-0016 LAND PATTERN NO. Refer to Application Note 1891 Maxim Integrated 79 MAX98371 2/15 Initial release Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking PAGES CHANGED For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at 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. 2015 Maxim Integrated Products, Inc. 80

PDF Datasheet Preview

MAX98371

EVALUATION KIT AVAILABLE

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

The MAX98371 is a high-efficiency, mono Class D audio amplifier featuring Dynamic Headroom Tracking DHT . DHT automatically optimizes the headroom available to the Class D amplifier as the power supply voltage varies, due to sudden transients and declining battery life to maintain a consistent listening experience. A wide 5.5V to 18V supply range allows the device to reach 19W into an load.

The MAX98371’s flexible digital audio interface DAI supports I2S, Left-Justified, and TDM formats. The digital audio interface accepts 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz sample rates with 16-/24-/32-bit data supported for all data formats. In TDM mode, the device can support up to 16 channels of audio data. A unique clocking structure eliminates the need for an external MCLK signal that is typically needed for PCM communication. This reduces pin count and simplifys board layout.

Active Emissions Limiting AEL with edge rate control minimizes EMI, and eliminates the need for output filtering found in traditional Class D devices.

An 8-bit PVDD supply voltage ADC enables the Dynamic Headroom Tracking circuit. DHT optimizes audio program peak behavior as the supply voltage varies and provides flexible user-defined parameters.

Thermal foldback protection ensures robust behavior when the thermal limits of the device are exercised. The circuit can be enabled to automatically reduce the output power above a user specified temperature. This allows for uninterrupted music playback even at high ambient temperatures. Traditional thermal protection is also available in addition to robust overcurrent protection.

All MAX98371 control is performed using a standard 2-wire, I2C interface. One of sixteen slave addresses can be selected through two, four-level address pins. The IC is available in a 0.4mm pitch, 30-bump WLP package. It is specified over the extended, -40°C to +85°C temperature range.
●● Tablets ●● Notebook Computers ●● Soundbars

Benefits and Features
●● Wide Supply Range 5.5V to 18V ●● Dynamic Headroom Tracking Maintains a Consistent

Listening Experience ●● Integrated Thermal Foldback Allows Robust

Operation in a WLP Package ●● Remote Output Sensing Allows Up to 20dB THD+N

Improvement When Ferrites Are Used ●● Class D Edge Rate Control Enables Filterless

Operation ●● 110dB A-Weighted Dynamic Range ●● Output Power at 1% THD+N:
• 15.7W into 8Ω, VPVDD = 17V
• 13.2W into 4Ω, VPVDD = 12V ●● Output Power at 10% THD+N
• 19W into 8Ω, VPVDD = 17V
• 15.8W into 4Ω, VPVDD = 12V ●● Speaker Amplifier Efficiency
• 91% at 10W into 8Ω, VPVDD = 12V
• 81% at 15W into 4Ω, VPVDD = 12V ●● Extensive Click-and-Pop Suppression ●● Space Saving, 30-Bump WLP Package 2.1mm x 2.6mm x 0.6mm, 0.4mm Pitch

Simplified Block Diagram
Ordering Information appears at end of data sheet.

MAX98371

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

TABLE OF CONTENTS

General Description 1 Applications 1 Benefits and Features 1 Simplified Block Diagram 1 Detailed Functional Diagram 6 Absolute Maximum Ratings 7 Package Thermal Characteristics 7 Electrical Characteristics 7 I2C Timing Characteristics 14 Power Consumption 15 Typical Operating Characteristics 16 Pin Configurations 23 Pin Description 24 Detailed Description 25

Interrupts 29 Status 29 State 29 Flag 29 Enable 29 Clear 29

Digital Audio Interface 40 Interface Format 41 Configuring the DAI Format 41 Configuring the Digital Audio Input 42 Digital Passband Filtering 47 Biquad Filter 48 Signal Path Delay 48

PVDD ADC 49 Digital Volume Control 49 Output Voltage Scaling 50

Dynamic Headroom Tracking 51 DHT Ballistics 58 Limiter 61

Maxim Integrated 2

MAX98371

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

TABLE OF CONTENTS continued

Thermal ADC 61 Thermal Protection 61 Thermal Foldback 62 DOUT Operation and Data format 63 Interchip Communication 65 Multiamplifier Grouping 65 Double Data Drive 66 Class D Output Stage 71
Maxim Integrated 3

MAX98371

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

LIST OF FIGURES

Figure I2S Audio Interface Timing Diagram 13 Figure Left-Justified Audio Interface Timing Diagram 13 Figure 3.TDM Audio Interface Timing Diagrams 13 Figure I2C Interface Timing Diagram 14 Figure I2S Digital Audio Format Examples 44 Figure Left-Justified Digital Audio Format Examples 45 Figure TDM Digital Audio Format Examples 46 Figure Example of Dynamic Headroom Tracking in Mode 1 Operation 51 Figure Example of Dynamic Headroom Tracking in Mode 2 Operation with a High RP 52 Figure Example of Dynamic Headroom Tracking in Mode 2 Operation with a Low RP 53 Figure Example of Dynamic Headroom Tracking in Mode 3a Operation 55 Figure Example of Dynamic Headroom Tracking in Mode 3b Operation 56 Figure Example of Dynamic Headroom Tracking in Mode 3b with Limiter. 57 Figure Dynamic Headroom Tracking Attack functionality 58 Figure Thermal Foldback performance 63 Figure DOUT data structure 64 Figure Single Data Drive 66 Figure Double Data Drive illustration 66 Figure Typical Application Circuit with Ferrites Beads Used 72 Figure 20 .THD Performance Improvement Enabled by Remote Sensing 72 Figure START, STOP, and REPEATED START Conditions 74 Figure Acknowledge 75 Figure Writing One Byte of Data to the MAX98371 75 Figure n-Bytes of Data to the MAX98371 75 Figure Reading One Byte of Data from the MAX98371 76 Figure Reading n-Bytes of Data from the MAX98371 76 Figure MAX98371+ WLP Ball Dimensions 78

LIST OF TABLES

Table MAX98371 Control Register Map 25 Table Interrupt Sources 29 Table Interrupt Registers 30 Table Supported Sample Rates 40 Table Supported BCLK Rates in Slave Mode 40 Table Configuration for Digital Audio Interface Format 41

Maxim Integrated 4

MAX98371

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

LIST OF TABLES CONTINUED

Table Configuration for Digital Audio Interface Format 42 Table TDM Channel Selection for Mono Replay 44 Table Digital Highpass Filter 47 Table Biquad Filter Coefficient Registers 48 Table Signal Path Delay 48 Table PVDD Measurement ADC 49 Table Digital Volume Ramping and Digital Volume 49 Table Digital Gain Settings and Output Voltage Scaling 50 Table Speaker Gain Minimum Voltage 54 Table Dynamic Headroom Tracking Attack Settings 59 Table Dynamic Headroom Tracking Release Settings 60 Table Dynamic Gain Enables 60 Table Limiter Threshold Select 60 Table Manual Limiter Threshold Settings 61 Table Limiter Threshold 61 Table Limiter Attack and Release Settings 62 Table Thermal ADC Measurements 62 Table Thermal Foldback Settings 63 Table Thermal Foldback Enable 63 Table DHT INFO 64 Table Thermal and DHT Link Enables 64 Table THERM INFO 64 Table InterChip Communication Configuration 65 Table DOUT Double Data Drive Mode 66 Table DOUT DHT Receive Channel Configuration 67 Table DOUT Thermal Foldback Receive Channel Configuration 68 Table DOUT Thermal Foldback Receive Channel Configuration 69 Table Extra BCLK Cycle Configuration 70 Table Manual HIZ Mode Configuration 70 Table Speaker Configuration 71 Table Clock Monitor Configuration 73 Table Reset Register 73 Table Global Enable Register 73 Table ADDR I2C Address Select 77 Table Recommended External Components 78

Maxim Integrated 5

MAX98371

Detailed Functional Diagram

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

Maxim Integrated 6

MAX98371

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

Absolute Maximum Ratings

PVDD to 20V OUT_ to -0.3V to VPVDD + 0.3V VREFC to 2.2V DVDD to 2.2V SDA, SCL, ADDR_, IRQ to DGND..........................-0.3V to 2.2V BCLK, LRCLK, DIN,

RESET to DGND ...............................-0.3V to VDVDD + 0.3V AGND, DGND to PGND to 0.1V

Short-Circuit Duration Between OUTP, OUTN and PGND or PVDD.........Continuous Between OUTP and OUTN

Continuous Power Dissipation TA = +70°C for Multilayer Board derate 27mW/°C above

Junction 150°C Operating Temperature to 85°C Storage Temperature to 150°C Soldering Temperature 260°C

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.

Package Thermal Characteristics Note 1

Junction-to-Ambient Thermal Resistance 37°C/W Junction-to-Board Thermal Resistance

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

Electrical Characteristics

VPVDD = 12V, VDVDD = RESET = 1.8V, VGND = 0V, CPVDD = 1x 220µF, 2x 10µF, 2x 0.1µF, CREFC = 1µF, CDVDD = 1µF, ZSPK = open, AC measurement bandwidth 20Hz to 22kHz, fS = 48kHz, 24-bit data, TA = TMIN to TMAX, unless, otherwise noted. Typical values are at TA = +25°C. Note 2

PARAMETER

CONDITION

MAX UNITS

Power Supply Voltage Range

VREFC Regulator Output

VPVDD VDVDD VREFC

PVDD Under Voltage Lockout

PVDD UVLO

DVDD Under Voltage Lockout

DVDD UVLO
Ordering Information

PART

TEMP RANGE PIN-PACKAGE

MAX98371EWV+T
-40°C to +85°C
30 WLP

MAX98371EWV+
-40°C to +85°C
30 WLP
+Denotes a lead Pb -free/RoHS-compliant package.

T = Tape and reel.

Package Information

For the latest package outline information and land patterns footprints , go to 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
30-WLP

PACKAGE CODE

W302E2+1

OUTLINE NO.
21-0016

LAND PATTERN NO.

Refer to Application Note 1891

Maxim Integrated 79

MAX98371
2/15

Initial release

Digital Input Class D Speaker Amplifier with Dynamic Headroom Tracking

PAGES CHANGED
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at

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. 2015 Maxim Integrated Products, Inc. 80

Notice: we do not provide any warranties that information, datasheets, application notes, circuit diagrams, or software stored on this website are up-to-date or error free. The archived MAX98371EWV+ Datasheet file may be downloaded here without warranties.

Datasheet ID: MAX98371EWV+ 647440