ADAU1452 Datasheet, PDF (177/180 Pages) Analog Devices – SigmaDSP Digital Audio Processor

Data Sheet
ADAU1452/ADAU1451/ADAU1450
Power Supply Isolation with Ferrite Beads
EOS/ESD Protection
Ferrite beads can be used for supply isolation. When using
Although the ADAU1452/ADAU1451/ADAU1450 has robust
ferrite beads, always place the beads outside the local high
internal protection circuitry against overvoltages and
frequency decoupling capacitors, as shown in Figure 86. If the
electrostatic discharge, an external transient voltage suppressor
ferrite beads are placed between the supply pin and the decoupling
(TVS) is recommended for all systems to prevent damage to the
capacitor, high frequency noise is reflected back into the IC
IC. For examples, see the AN-311 Application Note.
because there is no suitable return path to ground. As a result,
EMI increases, creating noisy supplies.
DGND
1
IOVDD VDRIVE DVDD
2
3
71
DGND
72
100nF
(BYPASS)
1kΩ
100nF
(BYPASS)
FERRITE
MAIN
BEAD
3.3V SUPPLY
10µF ₊
OR 4.7µF
RESERVOIR
IOVDD
3.3V
10µF ₊
OR 4.7µF
DVDD ^RESERVOIR
1.2V
Figure 86. Ferrite Bead Power Supply Isolation Circuit Example
TYPICAL APPLICATIONS BLOCK DIAGRAM
HEAD
UNIT
I²C
SPI
CAN
TRANSCEIVER
MICRO-
CONTROLLER
SPI
ADAU1452/
ADAU1451/
ADAU1450
SPI
ADAU1977
MICROPHONE
ADC
AD1938/
AD1939
CODEC
8-CHANNEL
DAC
PDM
ANALOG
MICROPHONES
CLASS AB/D
4-CHANNEL
AMPLIFIER
CLASS AB/D
4-CHANNEL
AMPLIFIER
SPEAKERS
PDM
MICROPHONES
eFLASH
Figure 87. Automotive Infotainment Amplifier Block Diagram
Rev. C | Page 177 of 180