SSM4567ACBZ-R7 datasheet(4/52 Pages) AD

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SSM4567

Data Sheet

Rev. 0| Page 4 of 52

GENERAL DESCRIPTION

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).

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