Device overview FDA2100BLV
6/11 DocID030219 Rev 1
2 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 I
2
C and I
2
S 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 I
2
C interface and kept until the first I
2
C 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.
