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STA321 Folha de dados(PDF) 19 Page - STMicroelectronics

Nome de Peças STA321
Descrição Electrónicos  4-channel digital audio system with FFX??driver
PDF  157 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
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STA321 Folha de dados(HTML) 19 Page - STMicroelectronics

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STA321
Electrical specifications
Doc ID 15351 Rev 3
19/157
3.5
Embedded DC regulator
The power supply to the digital STA321 core and PLL is provided via embedded linear DC
regulators as shown below in Figure 6. When pin REG_BYPASS is tied to ground, the DC
regulators are active so that a voltage in the range 2.5 V to 3.6 V applied to pins VDD_REGx
or PVDD provides a regulated internal voltage to the core and the PLL. The voltages Vddi
and Vddipll range from 1.55 V to 1.95 V depending on operating conditions.
Figure 6.
Embedded DC regulator scheme
If the application allows multiple supplies or the power supply requirements are a
fundamental constraint, pin REG_BYPASS can be tied high and a 1.8 V external supply can
be applied directly to pins VDD_REGx and PVDD. In this case the operating range for such
an external supply is 1.55 V to 1.95 V.
Embedded DC regulators imply also static power consumption that must be take into
account when the power-down modes are active. The STA321 provides a deep powerdown
mode where also the regulators are active but in a low power consumption mode (see
Section 4.3.2 on page 27).
Core
PLL
DC
DC
DC
STA321
VDD_REG1
VDD_REG2
PVDD
Vddi
Vddi
Vddipll
REG_BYPASS



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