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Tiny, Cost-Effective, Plug-and-Play Digital Class-D Amplifier

One-of-a-Kind Filterless, High-Performance Class-D Amplifier in a Tiny WLP Package with no Vias or Programming Required

Product Details

The MAX98360A/B/C/D is an easy-to-use, low-cost, digital pulse-code modulation (PCM) input Class-D amplifier that provides industry-leading, Class-AB audio performance with Class-D efficiency. The digital audio interface automatically recognizes different PCM and TDM clocking schemes which eliminates the need for I2C programming. Simply supply power, LRCLK, BCLK, and digital audio to generate audio. Furthermore, a novel pinout allows customers to use the cost-effective WLP package with no need for expensive vias.

The digital audio interface is highly flexible. The devices support I2S, left-justified, and 8-channel time division multiplexed (TDM) data formats. The digital audio interface accepts 8kHz, 16kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz sample rates. Data words can be 16-bit, 24-bit, or 32-bit in I2S and left-justified modes and 16-bit or 32-bit in TDM mode.

Digital audio interface input thresholds are ideal for interfacing to 1.2V and 1.8V logic. The devices can tolerate logic input voltages up to 5.5V.

The MAX98360A and MAX98360B have fast 1ms turn-on times while the MAX98360C and MAX98360D ramp the volume over 13ms during turn-on and turn-off.

The devices eliminate the need for the external MCLK signal that is typically used for PCM communication. This reduces EMI and possible board coupling issues in addition to reducing the size and pin count. The devices also feature a very high wideband jitter tolerance (12ns, typ) on BCLK and LRCLK to provide robust operation.

Active emissions-limiting, edge-rate limiting, and overshoot 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.

The devices are specified over the -40°C to +85°C temperature range.

MAX98360 Version Management

Ramping Frame Sync Pulse on LRCLK 50% Duty Cycle on LRCLK
Turn-On/Off Ramp Start-Up Time Format BCLK Active Edge Format BCLK Active Edge
MAX98360A Ramp Disabled 1ms TDM rising I2S rising
MAX98360B Ramp Disabled 1ms TDM falling LJ rising
MAX98360C Ramp Enabled 13ms TDM rising I2S rising
MAX98360D Ramp Enabled 13ms TDM falling LJ rising

Key Features

  • Simple Plug-and-Play Design
  • Single-Supply Operation (2.5V to 5.5V)
  • 3.2W Output Power into 4Ω at 5V
  • 2.2mA Quiescent Current
  • 1ms Turn-On Time (for MAX98360A and MAX98360B)
  • 92% Efficiency (RL = 8Ω, THD+N = 10%)
  • 10μVRMS Output Noise
  • 110dB Dynamic Range
  • Low 0.009% THD+N at 1kHz
  • No MCLK Required
  • Sample Rates of 8kHz to 96kHz
  • Supports Left, Right, or (Left/2 + Right/2) Output in I2S and Left-Justified Modes
  • Sophisticated Edge Rate Control Enables Filterless Class-D Outputs
  • 81dB PSRR at 217Hz
  • 1.5μA Standby Current Allows Elimination of GPIO for EN Pin
  • Low RF Susceptibility Rejects TDMA Noise from GSM Radios
  • Class-D Switching Frequency Trimmed to 5% for Better EMI Planning
  • Extensive Click-and-Pop Reduction Circuitry
  • Robust Short-Circuit and Thermal Protection
  • Available in Space-Saving Package: 9-Pin WLP (0.4mm Pitch) or 10-Pin FC2QFN (0.5mm Pitch)
  • 3.69mm2 Solution Size for WLP With A Single Bypass Capacitor

Applications/Uses

  • Single Li-ion Cell/5V Devices
  • Smart Speakers
  • Notebook Computers
  • IoT Devices
  • Gaming Devices (Audio and Haptics)
  • Smartphones
  • Tablets
  • Cameras
Parametric specs for Speaker Amplifiers
# Channels 1
Class D
Spkr. Amp. VCC (V) (min) 2.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 2
POUT into 4Ω @ 1% THD+N (W) (min) 2.5
POUT into 4Ω @ 10% THD+N (W) (min) 3.2
POUT into 8Ω @ 1% THD+N (W) (min) 1.4
POUT into 8Ω @ 10% THD+N (W) (min) 1.8
Spkr. Amp. Half Pwr. THD+N (%) 0.006
SNR (dB) (A- Weighted) 110
PSRR (dB) (min) 80
Package/Pins FC2QFN/10
THIN WLP/9
Budgetary
Price (See Notes)
$0.92 @1k
View More

Simplified Block Diagram

MAX98360A, MAX98360B, MAX98360C, MAX98360D: Functional Diagram MAX98360A, MAX98360B, MAX98360C, MAX98360D: Functional Diagram Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Additional Resources

MAX98360A/B/C/D Ebrief ›

Description

The MAX98360 Evaluation Systems (EV Systems) are fully assembled and tested systems that evaluate the MAX98360A/B/C/D mono Class D audio amplifiers. The EV Systems consist of a MAX98360 Development Board (DEV Board), Maxim’s Audio Interface Board III (AUDINT3), and a USB cable.

It is recommended that the DEV Board be evaluated with the AUDINT3 board, as an EV System. MAX98360A and MAX98360C support the standard I2S interface, and MAX98360B and MAX98360D support standard leftjustified mode. All MAX98360 variants support an 8-channel TDM digital audio interface.

The AUDINT3 board provides the USB-to-PCM interface in addition to the 1.8V VDDIO supply needed to evaluate the DEV Board. The MAX98360 DEV Board requires one additional supply input, 2.5V–5.5V (VDD) when evaluating using the AUDINT3 board.

View Details

Features

  • 2.5V to 5.5V Single-Supply Operation
  • I2S, Left-Justified, or TDM Input
  • Five Selectable Gains (-3dB, 3dB, 6dB, 9dB, and 12dB)
  • Audio Channel Select (Left, Right, and Mono Mix)
  • Filterless Operation
  • Low EMI
  • Complete Hardware System with Easy Setup, No Tools or Special Software Required

Description

The MAX98360 Evaluation Systems (EV Systems) are fully assembled and tested systems that evaluate the MAX98360A/B/C/D mono Class D audio amplifiers. The EV Systems consist of a MAX98360 Development Board (DEV Board), Maxim’s Audio Interface Board III (AUDINT3), and a USB cable.

It is recommended that the DEV Board be evaluated with the AUDINT3 board, as an EV System. MAX98360A and MAX98360C support the standard I2S interface, and MAX98360B and MAX98360D support standard leftjustified mode. All MAX98360 variants support an 8-channel TDM digital audio interface.

The AUDINT3 board provides the USB-to-PCM interface in addition to the 1.8V VDDIO supply needed to evaluate the DEV Board. The MAX98360 DEV Board requires one additional supply input, 2.5V–5.5V (VDD) when evaluating using the AUDINT3 board.

View Details

Features

  • 2.5V to 5.5V Single-Supply Operation
  • I2S, Left-Justified, or TDM Input
  • Five Selectable Gains (-3dB, 3dB, 6dB, 9dB, and 12dB)
  • Audio Channel Select (Left, Right, and Mono Mix)
  • Filterless Operation
  • Low EMI
  • Complete Hardware System with Easy Setup, No Tools or Special Software Required

Description

The MAX98360 Evaluation Systems (EV Systems) are fully assembled and tested systems that evaluate the MAX98360A/B/C/D mono Class D audio amplifiers. The EV Systems consist of a MAX98360 Development Board (DEV Board), Maxim’s Audio Interface Board III (AUDINT3), and a USB cable.

It is recommended that the DEV Board be evaluated with the AUDINT3 board, as an EV System. MAX98360A and MAX98360C support the standard I2S interface, and MAX98360B and MAX98360D support standard leftjustified mode. All MAX98360 variants support an 8-channel TDM digital audio interface.

The AUDINT3 board provides the USB-to-PCM interface in addition to the 1.8V VDDIO supply needed to evaluate the DEV Board. The MAX98360 DEV Board requires one additional supply input, 2.5V–5.5V (VDD) when evaluating using the AUDINT3 board.

View Details

Features

  • 2.5V to 5.5V Single-Supply Operation
  • I2S, Left-Justified, or TDM Input
  • Five Selectable Gains (-3dB, 3dB, 6dB, 9dB, and 12dB)
  • Audio Channel Select (Left, Right, and Mono Mix)
  • Filterless Operation
  • Low EMI
  • Complete Hardware System with Easy Setup, No Tools or Special Software Required

Description

The MAX98360 Evaluation Systems (EV Systems) are fully assembled and tested systems that evaluate the MAX98360A/B/C/D mono Class D audio amplifiers. The EV Systems consist of a MAX98360 Development Board (DEV Board), Maxim’s Audio Interface Board III (AUDINT3), and a USB cable.

It is recommended that the DEV Board be evaluated with the AUDINT3 board, as an EV System. MAX98360A and MAX98360C support the standard I2S interface, and MAX98360B and MAX98360D support standard leftjustified mode. All MAX98360 variants support an 8-channel TDM digital audio interface.

The AUDINT3 board provides the USB-to-PCM interface in addition to the 1.8V VDDIO supply needed to evaluate the DEV Board. The MAX98360 DEV Board requires one additional supply input, 2.5V–5.5V (VDD) when evaluating using the AUDINT3 board.

View Details

Features

  • 2.5V to 5.5V Single-Supply Operation
  • I2S, Left-Justified, or TDM Input
  • Five Selectable Gains (-3dB, 3dB, 6dB, 9dB, and 12dB)
  • Audio Channel Select (Left, Right, and Mono Mix)
  • Filterless Operation
  • Low EMI
  • Complete Hardware System with Easy Setup, No Tools or Special Software Required

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.

Parameters

Parametric specs for Speaker Amplifiers
# Channels 1
Class D
Spkr. Amp. VCC (V) (min) 2.5
Spkr. Amp. VCC (V) (max) 5.5
Spkr. Amp. ICC (mA) (typ) 2
POUT into 4Ω @ 1% THD+N (W) (min) 2.5
POUT into 4Ω @ 10% THD+N (W) (min) 3.2
POUT into 8Ω @ 1% THD+N (W) (min) 1.4
POUT into 8Ω @ 10% THD+N (W) (min) 1.8
Spkr. Amp. Half Pwr. THD+N (%) 0.006
SNR (dB) (A- Weighted) 110
PSRR (dB) (min) 80
Package/Pins FC2QFN/10
THIN WLP/9
Budgetary
Price (See Notes)
$0.92 @1k

Key Features

  • Simple Plug-and-Play Design
  • Single-Supply Operation (2.5V to 5.5V)
  • 3.2W Output Power into 4Ω at 5V
  • 2.2mA Quiescent Current
  • 1ms Turn-On Time (for MAX98360A and MAX98360B)
  • 92% Efficiency (RL = 8Ω, THD+N = 10%)
  • 10μVRMS Output Noise
  • 110dB Dynamic Range
  • Low 0.009% THD+N at 1kHz
  • No MCLK Required
  • Sample Rates of 8kHz to 96kHz
  • Supports Left, Right, or (Left/2 + Right/2) Output in I2S and Left-Justified Modes
  • Sophisticated Edge Rate Control Enables Filterless Class-D Outputs
  • 81dB PSRR at 217Hz
  • 1.5μA Standby Current Allows Elimination of GPIO for EN Pin
  • Low RF Susceptibility Rejects TDMA Noise from GSM Radios
  • Class-D Switching Frequency Trimmed to 5% for Better EMI Planning
  • Extensive Click-and-Pop Reduction Circuitry
  • Robust Short-Circuit and Thermal Protection
  • Available in Space-Saving Package: 9-Pin WLP (0.4mm Pitch) or 10-Pin FC2QFN (0.5mm Pitch)
  • 3.69mm2 Solution Size for WLP With A Single Bypass Capacitor

Applications/Uses

  • Single Li-ion Cell/5V Devices
  • Smart Speakers
  • Notebook Computers
  • IoT Devices
  • Gaming Devices (Audio and Haptics)
  • Smartphones
  • Tablets
  • Cameras

Description

The MAX98360A/B/C/D is an easy-to-use, low-cost, digital pulse-code modulation (PCM) input Class-D amplifier that provides industry-leading, Class-AB audio performance with Class-D efficiency. The digital audio interface automatically recognizes different PCM and TDM clocking schemes which eliminates the need for I2C programming. Simply supply power, LRCLK, BCLK, and digital audio to generate audio. Furthermore, a novel pinout allows customers to use the cost-effective WLP package with no need for expensive vias.

The digital audio interface is highly flexible. The devices support I2S, left-justified, and 8-channel time division multiplexed (TDM) data formats. The digital audio interface accepts 8kHz, 16kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz sample rates. Data words can be 16-bit, 24-bit, or 32-bit in I2S and left-justified modes and 16-bit or 32-bit in TDM mode.

Digital audio interface input thresholds are ideal for interfacing to 1.2V and 1.8V logic. The devices can tolerate logic input voltages up to 5.5V.

The MAX98360A and MAX98360B have fast 1ms turn-on times while the MAX98360C and MAX98360D ramp the volume over 13ms during turn-on and turn-off.

The devices eliminate the need for the external MCLK signal that is typically used for PCM communication. This reduces EMI and possible board coupling issues in addition to reducing the size and pin count. The devices also feature a very high wideband jitter tolerance (12ns, typ) on BCLK and LRCLK to provide robust operation.

Active emissions-limiting, edge-rate limiting, and overshoot 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.

The devices are specified over the -40°C to +85°C temperature range.

MAX98360 Version Management

Ramping Frame Sync Pulse on LRCLK 50% Duty Cycle on LRCLK
Turn-On/Off Ramp Start-Up Time Format BCLK Active Edge Format BCLK Active Edge
MAX98360A Ramp Disabled 1ms TDM rising I2S rising
MAX98360B Ramp Disabled 1ms TDM falling LJ rising
MAX98360C Ramp Enabled 13ms TDM rising I2S rising
MAX98360D Ramp Enabled 13ms TDM falling LJ rising

Simplified Block Diagram

MAX98360A, MAX98360B, MAX98360C, MAX98360D: Functional Diagram MAX98360A, MAX98360B, MAX98360C, MAX98360D: Functional Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.