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FDA801B：4x50 W class-D digital input power amplifier with I2C diagnostics, Digital Impedance Meter and low voltage operation

FDA801B is a new BCD technology quad BRIDGE class D amplifier, specially intended for automotive applications.

Thanks to the technology used, it is possible to integrate a high performance D/A converter together with powerful MOSFET outputs in class D, to get an outstanding efficiency compared with the standard class AB.

The integrated D/A converter allows to reach outstanding performances (110 dB S/N ratio with 108 dB of dynamic range). The feedback loop includes the output L-C low-pass filter, allowing superior frequency response linearity and lower distortion independently from the inductor and capacitor quality.

FDA801B is fully configurable through I²C bus interface and integrates a full diagnostics array specially intended for automotive applications. Thanks to the solutions implemented to contain EMI emissions, the device is intended to be used in the standard single DIN car-radio box together with the tuner.

Moreover FDA801B is able to work with power supply as low as 6 V, thus supporting the most recent low voltage ('start-stop') car-makers specification.

Key Features

• Integrated 110 dB D/A conversion
• I2 S and TDM digital input (3.3/1.8 V)
• Input sampling frequency: 44.1 kHz, 48 kHz, 96 kHz, 192 kHz
• Class-D channels with 93% efficiency
• EMI control for AM compatibility
• EMI compliance evaluated following normative IEC61967-4 and IEC62132-4
• Low radiation function (LRF)
• Idle tones free DAC
• Output lowpass filter included in the feedback allowing lower cost filter components
• Max. output power
  • 4 x 50 W/4 Ω @ 15.2 V, 1 kHz
• High output power capability
  • 28 W/4 Ω 10 % THD, Vd = 14.4 V
• Full I2 C bus driving (3.3/1.8 V):
  • Channels independent tristate
  • Channel independent soft play/mute
  • I2 C bus diagnostics , including DC and AC load detection and load value recognition (DIM)
• Integrated fault protection
• Input and output offset detector
• Clipping detector
• ESD protection
• 6 V operation (“Start - Stop” engines compatibility)
• 2 and 1 Ω load driving capability

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