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MAX98358
PDM Input Class D Audio Power Amplifier
High-Performance, Low-Noise Digital Input Class D Amplifier
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Key Features
Applications/Uses
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) | 1.8 |
| 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 (%) | 0.013 |
| SNR (dB) (A- Weighted) | 99 |
| PSRR (dB) (min) | 77 |
| Package/Pins | TQFN/16 WLP/9 |
| Budgetary Price (See Notes) | $0.91 @1k |
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Simplified Block Diagram
Technical Docs
| Data Sheet | PDM Input Class D Audio Power Amplifier | Mar 30, 2020 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur 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) | 1.8 |
| 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 (%) | 0.013 |
| SNR (dB) (A- Weighted) | 99 |
| PSRR (dB) (min) | 77 |
| Package/Pins | TQFN/16 WLP/9 |
| Budgetary Price (See Notes) | $0.91 @1k |
Key Features
- Single-Supply Operation (2.5V to 5.5V)
- 3.2W Output Power into 4Ω at 5V
- 1.8mA Quiescent Current (VDD = 3.7V)
- 92% Efficiency (RL = 8Ω, POUT = 1.5W)
- 29µVRMS Output Noise (AV = 6dB)
- Low 0.013% THD+N at 1kHz
- 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
- Low RF Susceptibility Rejects TDMA Noise from GSM Radios
- Extensive Click-and-Pop Reduction Circuitry
- Robust Short-Circuit and Thermal Protection
- Available in Space-Saving Packages: 1.345mm x 1.435mm WLP (0.4mm Pitch), 3mm x 3mm TQFN
Applications/Uses
- Cellular Phones
- Notebook and Netbook Computers
- Portable Media Players
- Tablets
Description
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.
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.
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 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 temperature range.
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.
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 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 temperature range.
Technical Docs
| Data Sheet | PDM Input Class D Audio Power Amplifier | Mar 30, 2020 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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