ETC5064FN datasheet(14/18 Pages) STMICROELECTRONICS

14 / 18 page

APPLICATION INFORMATION

POWER SUPPLIES

While the pins at the ETC506X family are well pro-

tected against electrical misure, it is recommended

that the standard CMOS practice be followed, en-

suring that ground is connected to the device before

any other connections are made. In applications

where the printed circuit board may be plugged into

a ”hot” socket with power and clocks already pre-

sent, an extra long ground pin in the connector

should be used.

All ground connections to each device should meet

at a common point as close as possible to the GNDA

pin. This minimizes the interaction of ground return

currents flowing through a common bus impedance.

0.1

µF supply decoupling capacitors should be con-

nected from this common ground point to VCC and

VBB as close to the device as possible.

For best performance, the ground point of each

CODEC/FILTER on a card should be connected to

a common card ground in star formation, rather than

via a ground bus. This common ground point should

be decoupled to VCC and VBB with 10

µF capaci-

tors.

For best performance, TSx should be grounded if

not used.

Figure 4 : Typical Asynchronous Application.

ETC5064 - ETC5064-X - ETC5067 - ETC5067-X

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ETC5064FN 数据表(PDF) 14 Page - STMicroelectronics