SSM6515

RECOMMENDED FOR NEW DESIGNS

Ultra Low Power, Class-D Audio Amplifier

Data Sheet (Rev. A) Product Selection Table

Part Models: 2
1ku List Price: Starting From $1.68

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Overview

Filterless digital input, mono differential output Class-D amplifier with 3-level Σ-Δ modulation optimized for headphone drive
Operates from single 1.8 V supply
80 mW output power, 16 Ω load at <0.1% THD + N
2.57 μV rms noise, 113 dB A weighted signal-to-noise ratio and dynamic range
0.003% THD + N at 30 mW, 1 kHz output 32 Ω load
I²C control with up to 4 pin selectable addresses or standalone operation
Multiple serial data formats
- TDM, I²S, or left justified slave
- PDM input operating from 2.8224 MHz to 12.288 MHz
Support sample rates from 8 kHz to 768 kHz
3.9 μs latency with 6 MHz PDM input

Flexible digital gain adjustment
DC blocking high-pass filter with programmable corner frequency
1.55 mW typical idle power in high performance mode
Low power modes for reduced power consumption
Flexible output gain limiter and clipping
Auto power-down feature with zero digital input
Short-circuit protection
Pop and click suppression
User-selectable ultralow EMI emissions mode
Power-on reset
1.8 V PV_DD supply
1.2 V to 1.8 V IOV_DD supply
11-ball, 0.984 mm × 1.444 mm, 0.35 mm pitch WLCSP

The SSM6515 is a fully integrated, high efficiency, mono Class-D audio amplifier with digital input that is ideally suited for use in wireless headphones. The application circuit requires few external components and operates from a 1.8 V (PV_DD) supply and a 1.2 V to 1.8 V (IOV_DD) supply. With 1.8 V signaling, these can be shared. It can deliver 85 mW of continuous output power into a 16 Ω load with <1% total harmonic distortion plus noise (THD + N).

The SSM6515 features a high efficiency, low noise modulation scheme that requires no external inductor/capacitor (LC) output filters. This scheme continues to provide high efficiency even at very low output power resulting in battery life savings compared to conventional headphone amplifiers. The device operates with > 90% efficiency at 55 mW into a 16 Ω load and it has a signal-to-noise ratio (SNR) of 113 dB, A weighted. Spread spectrum, stable common-mode pulse density modulation provides a much lower electromagnetic interference (EMI) radiated emissions compared with other Class-D architectures.

The digital input eliminates the need of an external digital-to-analog converter (DAC). The SSM6515 has a micropower shutdown mode with a typical shutdown current of 6 μA at the 1.8 V PV_DD supply and can automatically power down with no input. The device also includes pop and click suppression circuitry that minimizes voltage glitches at the output during turn on and turn off. Inputs support various serial audio formats, including I²S, time division multiplexing (TDM), and pulse density modulation (PDM).

The SSM6515 is designed to operate with an I²C control interface or in standalone mode and specified over the temperature range of −40°C to +85°C. The device has built-in output short-circuit protection. The SSM6515 is available in a halide free, 11-ball, 0.984 mm × 1.444 mm, 0.35 mm pitch wafer-level chip scale package (WLCSP).

APPLICATIONS

Wireless headphones
Active noise canceling headphones
Smartphone earpiece speakers
Hearing assistance devices
Portable electronics

Part Models: 2
1ku List Price: Starting From $1.68

Documentation

Data Sheet 1

SSM6515: Ultra Low Power, Class-D Audio Amplifier Data Sheet (Rev.A) 04/27/2022

User Guide 1

UG-2030: Evaluating the SSM6515 Ultra Low Power, Class-D Audio Amplifier (Rev.0) 04/27/2022

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
SSM6515BCBZRL	11-Ball WLCSP (0.984 mm x 1.444 mm x 0.44 mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
SSM6515BCBZRL7	11-Ball WLCSP (0.984 mm x 1.444 mm x 0.44 mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

Evaluating the SSM6515 Ultra Low Power, Class-D Audio Amplifier

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Product Details

The EVAL-SSM6515Z provides access to all analog and digital inputs/outputs on the SSM6515.

The SSM6515 amplifier is controlled by Analog Devices, Inc., SigmaStudio^® software, which interfaces to the EVAL-SSM6515Z via a USB connection. The EVAL-SSM6515Z can be powered by the USB bus or by a single 3.8 V to 5 V supply. These supplies are regulated to the voltages required on the EVAL-SSM6515Z. The printed circuit board (PCB) is a 4-layer design, with a ground plane and a power plane on the inner layers. The EVAL-SSM6515Z contains 0.1 in. pitch male headers for connecting to external speakers. The minimum speaker load must be 8 Ω. The EVAL-SSM6515Z consists of two SSM6515s for evaluating the stereo headphone output.

For full details on the SSM6515, see the SSM6515 data sheet, which must be consulted in conjunction with this user guide when using the EVAL-SSM6515Z.