TS5070 Datasheet, PDF (14/32 Pages) STMicroelectronics – PROGRAMMABLE CODEC/FILTER COMBO 2ND GENERATION

TS5070 - TS5071
APPLICATION INFORMATION
Figure 2 shows a typical application of the TS5070
together with a transformer SLIC.
The design of the transformer is greatly simplified
due to the on-chip hybrid balancecancellation filter.
Only one single secondary winding is required (see
application note AN.091 - Designing a subscriber
line card module using the TS5070/COMBO IIG).
Figures 3 and 4 show an arrangement with SGS-
Thomson monolithic SLICS.
POWER SUPPLIES
While the pins of the TS5070 and TS5071/COMBO
IIG devices are well protected against electrical
misuse, it is recommended that the standard
CMOS practice of applying GND to the device be-
fore any otherconnectionsare made shouldalways
be followed.In applicationswhere the printedcircuit
card may be plugged into a hot socket with power
and clocks already present, an extra long ground
pin on the connectorshould be used and a Schottky
diode connected between VSS and GND. To mini-
mize noise sources all ground connections to each
device should meet at a common point as close as
possible to the GND pin in order to prevent the in-
teraction of ground return currents flowing through
a common bus impedance. Power supply decou-
pling capacitors of 0.1 µF shouldbe connectedfrom
this common device ground point to VCC and VSS
as closeto thedevice pins as possible. VCC and VSS
should also be decoupled with low effective series
resis-tance capacitorsof at least10 µF locatednear
the card edge connector.
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