TEA1064A/C1 Philips Semiconductors (Acquired by NXP), TEA1064A/C1 Datasheet - Page 6

• Manufacturer Part Number: TEA1064A/C1
• Description: TEA1064A; Low Voltage Versatile Telephone Transmission Circuit With Dialler Interface And Transmit Level Dynamic Limiting
• Manufacturer: Philips Semiconductors (Acquired by NXP)

Philips Semiconductors
FUNCTIONAL DESCRIPTION
Supplies V
Power for the TEA1064A and its peripheral circuits is
usually obtained from the telephone line. The IC develops
its own supply voltage at V
drop. The internal supply requires a decoupling capacitor
between V
set by a 3.6 k resistor between STAB and V
The DC current flowing into the set is determined by the
exchange supply voltage V
resistance R
and the DC voltage (including polarity guard) on the
subscriber set (see Fig.3).
The internal voltage regulator generates a
temperature-compensated reference voltage that is
available between V
[V
regulator requires decoupling by a capacitor between REG
and V
March 1994
handbook, full pagewidth
ref
Low voltage versatile telephone transmission circuit
with dialler interface and transmit level dynamic limiting
The voltage V
line current determine the supply capabilities and the maximum output swing on
the line (no loop damping is necessary).
The line voltage V
= V
EE
CC2-SLPE
(C3).
CC1
CC1
exch
LN-SLPE
and V
, V
, the subscriber line DC resistance R
LN
= 3.3 V (typ.)]. This internal voltage
CC2
V exch
R exch
= V
is fixed to V
CC2
EE
, LN, SLPE, REG and STAB (Fig.3)
ref
. The internal current stabilizer is
and SLPE
([I
line
Fig.3 Application with regulated line voltage (stabilized V
CC1
exch
ref
= 3.3
1.55 mA]
R line
, the feeding bridge
and regulates its voltage
TEA1064A
0.25 V. Resistor R16 together with the
17
DC
AC
REG
C3
R9).
I line
10
EE
STAB
R5
I SLPE
.
line
1
SLPE
LN
20
R9
R1
I CC1
6
The reference voltage can be used to:
Regulated line voltage
In this application the V
as shown in Fig.3. This configuration gives a stabilized
voltage across pins LN and SLPE which, applied via the
low-pass filter R16, C15, provides a supply to the
peripherals that is independent of the line current and
depends only on the peripheral supply current.
The value of R16 and the level of the DC voltage V
determine the supply capabilities. In the basic application
R16 = 392
peripheral supply current as a function of supply voltage is
shown in Fig.4. To increase the supply capabilities, the DC
voltage V
or by decreasing the value of R16.
(1) The TEA1064A application with regulated line voltage is the
16
V EE
V CC1
11
regulate directly the line voltage (stabilized
V
to stabilize the supply voltage for peripherals.
0.25 mA
I p
LN-SLPE
same as is used for TEA1060/TEA1061, TEA1067 and
TEA1068 integrated circuits.
0.25 mA
19 V CC2
LN-SLPE
= V
and C15 = 220 F. The worst-case
CC2-SLPE
can be increased by using R
C1
LN-SLPE
)
CC2
(1)
R16
C15
pin is connected to the LN pin
MGR058
).
peripheral
circuits
I p
Product specification
TEA1064A
V p
VA(REG-SLPE)
LN-SLPE