Device overview

FDA2100BLV

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DocID030219 Rev 1

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Device overview

The FDA2100BLV is a fully digital single chip class D amplifier with high immunity to the

demodulation filter effects, built-in diagnostic functions and step-up driver. The high

integration level and the on-board signal processing allow an excellent audio performance

to be achieved. Thanks to the digital input and a feedback strategy in the power stage that

make the amplifier robust with respect to the output filter non-idealities, the number and size

of the external components are minimized.

Differently from the typical PWM switching amplifiers, a new feedback technique is adopted

by FDA2100BLV. The LC filter is included in the feedback loop making the amplifier highly

insensitive to the characteristics of such a demodulator group. This solution optimizes the

system performance in terms of THD and frequency response. Regardless of the big phase

shifting introduced by the output filter the device shows a great phase margin for any load

condition.

A number of features has also been included to reduce EMI, making the system compliant

with the stringent limits typical of automotive applications and the fully digital approach

provides a strong GSM immunity.

The FDA2100BLV includes digital I2C and I2S interfaces, internal 20 bits DAC conversion,

digital signal processing for interpolation and noise shaping, step-up driver, internal PLL for

a pure clock generation and self diagnostic functions and automatic detection of wrong load

connections or variation of the load with respect to the expected one.

In particular, considering diagnostic feature, the FDA amplifiers family provides different

functions to detect several possible fault conditions. Any warning information will be stored

in the I2C interface and kept until the first I2C bus reading operation.

The main FDA2100BLV's diagnostic features are the following ones:



Load detection;



Under/over voltage evens;



Chip over temperature;



Digital input offset;



Output clipping;



Over temperature of an external component (i.e. step-up DMOS) through a suitable

NTC external sensor;



Output current digital acquisition.

FDA2100BLV can drive two 4 Ω speakers with an operating voltage up to 35 V.