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TEA1110A Datasheet(PDF) 4 Page - NXP Semiconductors

Part No. TEA1110A
Description  Low voltage versatile telephone transmission circuit with dialler interface
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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TEA1110A Datasheet(HTML) 4 Page - NXP Semiconductors

 
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1997 Apr 22
4
Philips Semiconductors
Product specification
Low voltage versatile telephone
transmission circuit with dialler interface
TEA1110A
PINNING
SYMBOL
PIN
DESCRIPTION
LN
1
positive line terminal
SLPE
2
slope (DC resistance) adjustment
REG
3
line voltage regulator decoupling
n.c.
4
not connected
DTMF
5
dual-tone multi-frequency input
MUTE
6
mute input to select speech or
dialling mode (active LOW)
IR
7
receiving amplifier input
AGC
8
automatic gain control/
line loss compensation
MIC
9
inverting microphone amplifier input
MIC+
10
non-inverting microphone amplifier
input
VEE
11
negative line terminal
QR
12
receiving amplifier output
GAR
13
receive gain adjustment
VCC
14
supply voltage for speech circuit and
peripherals
Fig.2 Pin configuration.
handbook, halfpage
MGG735
TEA1110A(T)
1
2
3
4
5
6
7
8
14
13
12
11
10
9
LN
SLPE
REG
n.c.
DTMF
MUTE
IR
AGC
MIC
MIC
+
VEE
QR
GAR
VCC
FUNCTIONAL DESCRIPTION
All data given in this chapter are typical values, except
when otherwise specified.
Supply (pins LN, SLPE, VCC and REG)
The supply for the TEA1110A and its peripherals is
obtained from the telephone line. See Fig.3.
The IC generates a stabilized reference voltage (Vref)
between pins LN and SLPE. Vref is temperature
compensated and can be adjusted by means of an
external resistor (RVA). Vref equals 3.35 V and can be
increased by connecting RVA between pins REG
and SLPE (see Fig.4), or decreased by connecting RVA
between pins REG and LN. The voltage at pin REG is
used by the internal regulator to generate Vref and is
decoupled by CREG, which is connected to VEE. This
capacitor, converted into an equivalent inductance
(see Section “Set impedance”), realizes the set
impedance conversion from its DC value (RSLPE) to its AC
value (RCC in the audio-frequency range). The voltage at
pin SLPE is proportional to the line current.
The voltage at pin LN is:
Where:
Iline = line current
ICC = current consumption of the IC
IP = supply current for peripheral circuits
I* = current consumed between LN and VEE.
The preferred value for RSLPE is 20 Ω. Changing RSLPE will
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
LN
V
ref
R
SLPE
I
SLPE
×
+
=
I
SLPE
I
line
I
CC
I
P
I∗
=


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