EVAL-SSM2377Z: 3.17W Mono @ 4Ω, 2.5 ~ 5.5V in


The SSM2377 is a fully integrated, high efficiency, Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 2.5 W of continuous output power with <1% THD + N when driving a 4 Ω load from a 5.0 V supply.

Spread-spectrum pulse density modulation (PDM) is used to provide lower EMI-radiated emissions compared with other Class-D architectures. The inherent randomized nature of spread-spectrum PDM eliminates the clock intermodulation (beating effect) of several amplifiers in close proximity.

The SSM2377 produces ultralow EMI emissions that significantly reduce the radiated emissions at the Class-D outputs, particularly above 100 MHz. The SSM2377 passes FCC Class B radiated emission testing with 50 cm, unshielded speaker cable without any external filtering.

The device also includes a gain select pin that allows the user to select a 6 dB or a 12 dB gain. This option improves gain matching between multiple SSM2377 devices within a single application as compared to using external resistors to set the gain. Input impedance is 80 kΩ and is independent of the gain setting.

The user guide describes how to configure and use the SSM2377 evaluation board. The user guide should be read in conjunction with the SSM2377 data sheet, which provides detailed information about the specifications, internal block diagrams, and application guidance for the amplifier IC.

The SSM2377 evaluation board carries a complete application circuit for driving a loudspeaker.


Manufacturer Analog Devices Inc.
Category Audio Amplifiers
Eval Board Part Number EVAL-SSM2377Z-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Amplifier Type Class D
Number of Outputs Mono
Output Power (RMS) @ Load 3.17 W @ 4 Ω
Voltage In 2.5 ~ 5.5 V
THD+N (1kHz) @ Conditions < 0.007% @ 1 W (8 Ω, 5.0 V)
Features Filterless Output
Frequency Jitter for EMI
Short Circuit Protection
Shutdown, Enable, Standby
Thermal Protection
Turn On/Off Depop
Efficiency @ Conditions >86%, 0.3 ~ 0.55 W @ 8Ω, 2.5V in
>85%, 0.3 ~ 1.1 W @ 8Ω, 3.6V in
>81%, 0.3 ~ 1.9 W @ 8Ω, 5V in
>80%, 0.4 ~ 1.5 W @ 4Ω, 3.6V in
>75%, 0.3 ~ 2.1 W @ 4Ω, 5V in
>75%, 0.3 ~ 0.8 W @ 4Ω, 2.5V in
Standby Current [Typical] 100 nA
Quiescent Current [Typical] 2.5 mA
Component Count + Extras 8 + 11
Application / Target Market Audio: MP3 Players
Cell Phones
Portable Devices
Design Author Analog Devices
Main I.C. Base Part SSM2377ACBZ-RL
Quiescent Current [Maximum] - Not Given
Standby Current [Maximum] - Not Given
Date Created By Author 2011-06
Date Added To Library 2021-09

Eval Board

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