TEA7063 ST Microelectronics, Inc., TEA7063 Datasheet - Page 5

• Manufacturer Part Number: TEA7063
• Description: Speech Circuit With Power Management
• Manufacturer: ST Microelectronics, Inc.

CIRCUIT DESCRIPTION
1. DC CHARACTERISTICS
1.1 V
The stabilized voltage VC is connected to Vline
(pin 16) through an internal shunt regulator T1,
T2, which presents to the line a high AC imped-
ance at frequecncies higher than 200Hz. At this
purpose the value of C1 (at pin 17) must be not
lower than 47 F (suggested value is 100 F).
The shunt regulator, T1 and T2, also controls the
extra current source, or power management, at
pin 12 (see also paragraph 6).
1.2 V
The line voltage (pin 16) is determined by the
value of the external resistor R6 and by the inter-
nal current, I
Figure 1
Figure 2
C
LINE
(pin 17)
(pin 16)
int
, flowing between V
C
(pin 17) and
Ground (see also paragr.: 1.1):
V
V
I
I
I
where I
ment)
V
guarantee both DC and AC characteristic in ac-
cordance to the specific standard of the different
adminastrations.
Another adjustment of the DC characteristic is
possible with R9. Increasing the value of R9
causes a decrease of I
duction of the product I
graph 7)
int
int
int
LINE
C
LINE
is reversely related to R9:
= 8 Volt/R9 + 60 A at I
= 4 Volt/R9 + 60 A at I
is fixed by design at about 2.5V.
= V
must be externally adjusted (with R6) to
L
C
depends on I
+ R 6 x I
int
int
LB
int
and consequently a re-
L
L
x R9. (see also Para-
(see supply manage-
> 25mA
= 6mA
TEA7063
5/15