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PDM Input Class D Audio Power Amplifier

High-Performance, Low-Noise Digital Input Class D Amplifier

Product Details

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

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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.

Simplified Block Diagram

MAX98358: Simplified Block Diagram MAX98358: Simplified Block Diagram Zoom icon

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 Search

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