SSM2305RMZ-R2

Overview

The SSM2305RMZ-R2 is a mono, filterless Class-D audio amplifier manufactured by Analog Devices Inc. It operates from a single supply voltage ranging from 2.5 V to 5.5 V and delivers up to 2.8 W into a 4 Ω load or 1.6 W into an 8 Ω load at 5.0 V with less than 10% THD+N. The device features a signal-to-noise ratio of 98 dB, utilizes Σ-Δ modulation for spread-spectrum operation to minimize EMI, and includes built-in thermal shutdown and short-circuit protection. It is housed in an 8-lead Mini Small Outline Package (MSOP).

Feature Summary

• Filterless design utilizing Sigma-Delta modulation eliminates the need for external output LC filters.
• Integrated pop-and-click suppression circuitry minimizes audible transients during power-up and power-down.
• Micropower shutdown mode reduces current consumption to approximately 20 nA when disabled.
• Fixed gain configuration of 18 dB with provisions for user-adjustable gain via external resistors.

Applications

• Mobile phones
• MP3 players
• Portable gaming devices
• Educational toys

Procurement Notes

Verify that the ordering suffix matches the required package type and reel quantity. Confirm RoHS compliance status as indicated by the Z suffix. Ensure the temperature range specification aligns with the intended operating environment requirements before finalizing procurement orders.

Selection Notes

Select this component for applications requiring high efficiency and minimal external component count. The MSOP package is suitable for space-constrained designs where lead frame chip scale packages are not preferred. Verify input biasing requirements to determine if coupling capacitors are necessary based on the source impedance.

Part Context

This part belongs to the SSM2305 series of Class-D audio amplifiers designed for mobile phone applications. It shares functional characteristics with other variants in the family but differs in packaging options. The RMZ suffix specifically denotes the 8-lead Mini Small Outline Package variant within the product line.

Replacement Considerations

SSM2305CPZ-R2

FAQ

Does the SSM2305 require external output filters?

No, the SSM2305 uses a filterless Sigma-Delta modulation scheme that relies on the speaker's inherent inductance and natural filtering capabilities.

How is the gain configured on the SSM2305?

The default closed-loop gain is 18 dB. Users can reduce the gain by connecting external resistors according to the formula provided in the datasheet.