SSM4567

Digital 2.5 W, 5.1 V, Boost Class-D Audio Amplifier with Output Sensing
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Product Details

The SSM4567 is a digital input Class-D power amplifier that includes an integrated boost converter, allowing higher output power than with a normal battery supply. This means that maximum output power is constant across the battery voltage range. The SSM4567 is ideal for power sensitive applications where system noise can corrupt the small analog signal sent to the amplifier, such as mobile phones, tablets, and portable media players.

The SSM4567 combines an audio digital-to-analog converter (DAC), a power amplifier, and PDM or PCM (I2S/TDM) digital audio interfaces on a single chip. Using the SSM4567, audio can be transmitted digitally to the audio amplifier, significantly reducing the effect of noise sources on the transmitted audio and eliminate the need for input coupling capacitors. The SSM4567 is capable of delivering 2.5 W of continuous output power with <1% THD + N driving a 4 Ω load from a 3.6 V supply.

The SSM4567 can be controlled by I2C, PDM pattern control, or TDM control. It can also operate in standalone mode without a control interface.

The SSM4567 includes circuitry to sense output current, output voltage, and the VBAT supply voltage. Current sensing is performed using an on-chip sense resistor that is connected between an output pin and the load. Output current and voltage are sent to an ADC. The outputs of these ADCs are available on the digital serial output port. The VBAT supply voltage can be used with an automatic gain control circuit that is fully configurable. This AGC can limit the maximum output at low battery voltages to avoid drawing too much current from the battery, thereby extending battery life.

The SSM4567 features a high efficiency, low noise modulation scheme that requires no external LC output filters. The closed-loop, five-level modulator design retains the benefits of an all digital amplifier, yet enables very good PSRR and audio performance. The modulation continues to provide high efficiency even at low output power and has an SNR of 104 dB, A-weighted. Spread spectrum pulse density modulation is used to provide lower EMI radiated emissions compared with other Class-D architectures.

The SSM4567 has a micropower shutdown mode with a typical shutdown current of 0.2 μA for the VBAT power supply. Shutdown is enabled automatically by gating input clock and data signals.

The SSM4567 is specified over the industrial temperature range of −40°C to +85°C. It has a built-in thermal shutdown and amplifier and boost output short-circuit protection. It is available in a 19-ball, 1.74 mm × 2.1 mm wafer level chip scale package (WLCSP).

APPLICATIONS

  • Mobile handsets
  • Tablets
  • Portable media players

Product Lifecycle

checked Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits

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EVAL-SSM4567 Circuit Diagram

Product Details

The SSM4567 evaluation board is a complete solution for driving loudspeakers with boosted battery power supply as well as sense output current, output voltage and the VBAT supply voltage. It includes the SSM4567 amplifier IC and the additional components needed to connect digital audio using an I2S/TDM interface or an SPDIF optical interface.

The SSM4567 combines an audio digital-to-analog converter (DAC), a power amplifier, and PDM or PCM(I2S/TDM) digital audio interfaces on a single chip. Using the SSM4567, audio can be transmitted digitally to the audio amplifier, significantly reducing the effect of noise sources on the transmitted audio and eliminate the need for input coupling capacitors. The SSM4567 is capable of delivering 2.5 W of continuous output power with <1% THD + N driving a 4 Ω load from a 3.6 V supply.

The SSM4567 can be controlled by I2C, PDM Pattern control, or TDM control. It can also operate in stand-alone mode without a control interface.

The SSM4567 includes circuitry to sense output current, output voltage, and the VBAT supply voltage. Current sense is performed using an on-chip sense resistor that is connected between an output pin and the load. Output current and voltage are sent to an ADC. The outputs of these ADCs are available on the digital serial output port. The VBAT supply voltage can be used with an automatic gain control circuit that is fully configurable. This AGC can limit the maximum output at low battery voltages to avoid too high current off the battery.

This user guide describes how to use the EVAL-SSM4567Z to test the features of the SSM4567 amplifier. It describes the hardware and software of the SSM4567 evaluation board, including detailed schematics and PCB layout artwork.

The SSM4567 data sheet, provides detailed information about the specifications, internal block diagrams, and application guidance for the amplifier IC.

Equipment Required
  • Audio source with optical fiber or 10-pin 0.100" digital audio header
  • Power supply (5.0 V, 2.0 A recommended)
  • EVAL-SSM4567Z board
  • Analog Devices USB-to-I2C adapter dongle, EVAL-ADUSB2Z
  • PC running Windows XP or later; USB 2.0 port required
  • Speaker, or other load

Software & Systems Requirements

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Design Resources

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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.

SSM4567 Material Declaration
PCN-PDN Information Quality And Reliability Symbols and Footprints

Sample & Buy

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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.


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Evaluation Boards Pricing displayed is based on 1-piece.
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.