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SSM2377:  Filterless, High Efficiency, Mono 2.5 W Class-D Audio Amplifer

Product Details

Product Status:Recommended for New Designs

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 driving a 4 Ω load from a 5.0 V supply.

The SSM2377 features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modu-lation operates with high efficiency even at low output power.

The SSM2377 operates with 92% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has an SNR of >100 dB.

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 signifi-cantly 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 ultralow EMI emissions of the SSM2377 are also helpful for antenna and RF sensitivity problems.

The device is configured for either a 6 dB or a 12 dB gain setting by connecting the GAIN pin to the VDD pin or the GND pin, respectively. Input impedance is a fixed value of 80 kΩ, indepen-dent of the gain select operation.

The SSM2377 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin.

The device also includes pop-and-click suppression circuitry, which minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation. Built-in input low-pass filtering is also included to suppress out-of-band noise interference to the PDM modulator.

The SSM2377 is specified over the industrial temperature range of −40°C to +85°C. It has built-in thermal shutdown and output short-circuit protection. It is available in a halide-free, 9-ball, 0.4 mm pitch, 1.2 mm × 1.2 mm wafer level chip scale package (WLCSP).


  • Mobile phones
  • MP3 players
  • Portable electronics


  • Filterless Class-D amplifier with spread-spectrum Σ-Δ modulation
  • 2.5 W into 4 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <1% total harmonic distortion plus noise (THD + N)
  • 92% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
  • >100 dB signal-to-noise ratio (SNR)
  • High PSRR @ 217 Hz: 80dB
  • Ultra-low EMI emissions mode
  • Single-supply operation from 2.5 V to 5.5 V
  • Gain Select Function:
    6dB or 12dB
  • Fixed input impedance of 80 kΩ
  • 100 nA shutdown current
  • Short-circuit and thermal protection with autorecovery
  • Available in a 9-ball,
    1.2 mm × 1.2 mm WLCSP
  • Pop-and-click suppression

Functional Block Diagram for SSM2377

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SSM2377 Model Options
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

SSM2377 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
EVAL-SSM2377Z Status: Production Evaluation Board $60.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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