Datasheet

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. 0.1 mF supply decou-
pling capacitors should be connected from this common
ground point to V
CC
and V
BB
, 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 V
CC
and
V
BB
with 10 m F capacitors.
Note: See Application Note 370 for further details
Typical Asynchronous Application
TL/H/5070–5
Note 1: Transmit gain
e
20
c
log
#
R1
a
R2
R2
J
,(R1
a
R2)
t
10 kX
Note 2: Receive gain
e
20
c
log
#
2
c
R3
R4
J
,R4
t
10 kX
FIGURE 4
13