SSM4567:  Digital 2.5 W, 5.1 V, Boost Class-D Audio Amplifier with Output Sensing

Product Details

Product Status:Recommended for New Designs

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

FEATURES and BENEFITS

  • Filterless Class-D amplifier with spread-spectrum Σ-Δ modulation with integrated boost regulator (5.1 V)
  • Digitized output of output voltage, output current, and VBAT supply voltage
  • Integrated boost regulator
  • Multiple serial data formats:
    PDM input/output
    TDM slave with support for up to 8 chips on a single bus
    I2S or left justified slave
    Multichip I2S with support for up to 4 chips on one I2S bus
  • 8 kHz to 192 kHz PCM sample rates
  • 2.048 to 6.14 MHz PDM input sample rates
  • Standalone control modes
  • Configurable via I2C control, TDM control, or PDM patterns
  • 2.5 W into 4 Ω load and 1.42 W into 8 Ω load at 3.6 V supply with <1% total harmonic distortion plus noise (THD + N)
  • Available in 19-ball, 1.74 mm × 2.1 mm, 0.4 mm pitch WLCSP
  • See data sheet for additional features

Functional Block Diagrams for SSM4567

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Price, packaging, availability

SSM4567 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
SSM4567ACBZ-R7 Status: Production CHIPS W/SOLDER BUMPS/WLCSP 19 Ind Reel, 3000 - - Y  Material Info Notify Me Purchase
SSM4567ACBZ-RL Status: Production CHIPS W/SOLDER BUMPS/WLCSP 19 Ind Reel, 10000 - - Y  Material Info Notify Me Contact ADI
Price Table Help

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.

SSM4567 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-SSM4567Z Status: Production Evaluation Board $200.00 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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