The MAX9877 combines a high-efficiency Class D audio power amplifier with a stereo Class AB capacitor-less DirectDrive® headphone amplifier. Maxim's 3rd generation, filterless Class D amplifier with active emissions limiting technology provides Class AB performance with Class D efficiency.
The MAX9877 delivers up to 725mW from a 3.7V supply into an 8Ω load with 87% efficiency to extend battery life. The filterless modulation scheme combined with active emissions limiting circuitry and spread-spectrum modulation greatly reduces EMI while eliminating the need for output filtering used in traditional Class D devices.
The stereo Class AB headphone amplifier in the MAX9877 uses Maxim's patented DirectDrive architecture, that produces a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, space, and component height.
The device utilizes a user-defined input architecture, three preamplifier gain settings, an input mixer, volume control, comprehensive click-and-pop suppression, and I²C control. A bypass mode feature disables the integrated Class D amplifier and utilizes an internal DPST switch to allow an external amplifier to drive the speaker that is connected at the outputs of the MAX9877.
The MAX9877 is available in a thermally efficient, space-saving 20-bump WLP package.
Key Features
Applications/Uses
Low Emissions, Filterless Class D Amplifier Achieves Better than 10dB Margin Under EN55022 Class B Limits
Low RF Susceptibility Design Rejects TDMA Noise from GSM Radios
Input Mixer with User-Defined Input Mode
725mW Speaker Output (RSPK = 8Ω, PVDD = 3.7V)
53mW Headphone Output (RHP = 16Ω, VDD = 3.7V)
Low 0.05% THD+N at 1kHz (Class D Power Amplifier)
Low 0.016% THD+N at 1kHz (Headphone Amplifier)
87% Efficiency (RSPK = 8Ω, POUT = 750mW)
1.6Ω Analog Switch for Speaker Amplifier Bypass
High Speaker Amplifier PSRR (72dB at 217Hz)
High Headphone Amplifier PSRR (84dB at 217Hz)
I²C Control
Hardware and Software Shutdown Mode
Click-and-Pop Suppression
Current-Limit and Thermal Protection
Available in a Space-Saving, 2.5mm x 2.0mm WLP Package
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 prices
and delivery, please see the price and availability page
or contact an authorized distributor.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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MAX9877
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
MAX9877EWP+TG45
WLP;20 pin;0 mm²
Outline Drawing: (PDF)
Land Pattern: Not Available
Use pkgcode/variation: W202A2+2*
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