tea1110auh NXP Semiconductors, tea1110auh Datasheet - Page 5

• Manufacturer Part Number: tea1110auh
• Description: Low Voltage Versatile Telephone Transmission Circuit With Dialler Interface
• Manufacturer: NXP Semiconductors

Philips Semiconductors
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supply (pins LN, SLPE, V
The supply for the TEA1110A and its peripherals is
obtained from the telephone line; see Fig.3.
The IC generates a stabilized reference voltage (V
between pins LN and SLPE. V
compensated and can be adjusted by means of an
external resistor (R
increased by connecting R
SLPE (see Fig.4), or decreased by connecting R
between pins REG and LN. The voltage at pin REG is
used by the internal regulator to generate V
decoupled by C
capacitor, converted into an equivalent inductance
(see Section “Set impedance”), realizes the set
impedance conversion from its DC value (R
value (R
pin SLPE is proportional to the line current.
2000 Feb 15
handbook, full pagewidth
Low voltage versatile telephone
transmission circuit with dialler interface
CC
in the audio-frequency range). The voltage at
REG
VA
, which is connected to V
R exch
V exch
). V
R line
I line
ref
VA
CC
I SLPE
equals 3.35 V and can be
between pins REG and
and REG)
ref
I sh
is temperature
1
2
SLPE
LN
R SLPE
20
V d
SLPE
ref
EE
Fig.3 Supply configuration.
and is
. This
) to its AC
VA
ref
619
)
R CC
from pre amp
5
The voltage at pin LN is:
Where:
The preferred value for R
affect more than the DC characteristics; it also influences
the microphone and DTMF gains, the gain control
characteristics, the sidetone level and the maximum
output swing on the line.
V
I
SLPE
REG
LN
3
4.7 F
I
I
I
I* = current consumed between LN and V
C REG
I
line
CC
P
*
TEA1110A
= supply current for peripheral circuits
=
= current consumption of the IC
= line current
=
V
ref
I
line
I CC
+
R
–
SLPE
I
CC
V CC
14
11
V EE
–
I
P
I
SLPE
I –
SLPE
100 F
C VCC
is 20 . Changing R
MGG737
peripheral
Product specification
circuits
TEA1110A
I P
EE
.
SLPE
will