MAX98356 Datasheet, PDF (1/22 Pages) Maxim Integrated Products – PDM Input Class D Audio Power Amplifier

19-6311; Rev 0; 5/12
EVALUATION KIT AVAILABLE
MAX98356
PDM Input Class D Audio Power Amplifier
General 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 + 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 over-
shoot 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 -40NC to
+85NC temperature range.
Applications
Cellular Phones
Tablets
Portable Media Players
Notebook Computers
Ultrasonic Devices
Features
S Single-Supply Operation (2.5V to 5.5V)
S 3.2W Output Power into 4I at 5V
S 1.7mA Quiescent Current
S 92% Efficiency (R_L = 8I, P_OUT = 900mW,
VDD = 3.7V)
S 29µV_RMS Output Noise (A_V = 6dB)
S Low 0.013% THD+N at 1kHz
S Exceptionally High Jitter Tolerance
S Supported PDM_CLK Rates of 1.84MHz–4.32MHz
and 5.28MHz–8.64MHz
S Supports Left, Right, or (Left + Right)/2 Outputs
S Sophisticated Edge Rate Control Enables
Filterless Class D Outputs
S 77dB PSRR at 217Hz
S Low RF Susceptibility Rejects TDMA
Noise from GSM Radios
S Extensive Click-and-Pop Reduction Circuitry
S Robust Short-Circuit and Thermal Protection
S Available in Space-Saving Package:
1.345mm x 1.435mm WLP (0.4mm Pitch)
Simplified Block Diagram
Ordering Information and Functional Diagram appears at
end of data sheet.
PDM
INPUT
SHUTDOWN
AND
CHANNEL
SELECT
DIGITAL
AUDIO
INTERFACE
MAX98356
DAC
GAIN
CONTROL
CLASS D
OUTPUT
STAGE
For related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX98356.related
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For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.