TP3064 datasheet(13/18 Pages) NSC

13 / 18 page

Applications Information

POWER SUPPLIES

While the pins of the TP3060 family are well protected

against electrical misuse it is recommended that the stan-

dard CMOS practice be followed ensuring 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

present 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 01 mF supply decou-

pling capacitors should be connected 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 mF capacitors

Note

See Application Note 370 for further details

Typical Asynchronous Application

TLH5070 – 5

Note 1

Transmit gain e 20 c log

R1aR2

J (R1 a R2) t 10 kX

Note 2

Receive gain e 20 c log

2cR3

J R4 t 10 kX

FIGURE 4

TP3064 Fiches technique(PDF) 13 Page - National Semiconductor (TI)