Audio
MAX98356

MAX98356

PDM Input Class D Audio Power Amplifier

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


Description

The MAX98356 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 MAX98356 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. The IC can be configured to produce a left channel, right channel, or left/2 + right/2 output from the stereo input data. The IC also features an extremely robust digital audio interface with very high wideband jitter tolerance (12ns typ) on PDM_CLK.

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 a 9-pin WLP package (1.345mm x 1.435mm x 0.64mm) and is specified over the -40°C to +85°C temperature range.
MAX98356: Simplified Block Diagram MAX98356: Simplified Block Diagram Enlarge++

Key Features

  • Single-Supply Operation (2.5V to 5.5V)
  • 3.2W Output Power into 4Ω at 5V
  • 1.8mA Quiescent Current
  • 92% Efficiency (RL = 8Ω, POUT = 900mW, VDD = 3.7V)
  • 29µVRMS Output Noise (AV = 6dB)
  • Low 0.013% THD+N at 1kHz
  • Exceptionally High Jitter Tolerance
  • 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 Package: 1.345mm x 1.435mm WLP (0.4mm Pitch)

Applications/Uses

  • Cellular Phones
  • Notebook Computers
  • Portable Media Players
  • Tablets
  • Ultrasonic Devices
Part Number Class Spkr. Amp. VCC
(V)
Spkr. Amp. VCC
(V)
Spkr. Amp. ICC
(mA)
POUT into 4Ω @ 1% THD+N
(W)
POUT into 4Ω @ 10% THD+N
(W)
POUT into 8Ω @ 1% THD+N
(W)
POUT into 8Ω @ 10% THD+N
(W)
Spkr. Amp. Half Pwr. THD+N
(%)
SNR
(dB)
PSRR
(dB)
Budgetary
Price
min max typ min min min min A- Weighted min See Notes
MAX98356  D 2.5 5.5 2.5 2.5 3.2 1.4 1.8 0.013 105 77 $0.82 @1k
See All Speaker Amplifiers (37)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX98356EVKIT:  Evaluation Kit for the MAX98356
 

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