STA321TR View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STA321TR

4-channel digital audio system with FFX™ driver

STMicroelectronics 

STA321

Electrical specifications

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

VDD_REG1

VDD_REG2

REG_BYPASS

DC

Vddi

Vddi

DC

Core

PVDD

DC

Vddipll

PLL

STA321

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).

Doc ID 15351 Rev 3

19/157

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