tea1069n NXP Semiconductors, tea1069n Datasheet - Page 8

• Manufacturer Part Number: tea1069n
• Description: Versatile Speech/dialler/ringer With Music-on-hold
• Manufacturer: NXP Semiconductors

Philips Semiconductors
Thus, the regulated voltage on the line terminal (V
be calculated as:
V
reference voltage of 3.7 V and R9 is an external resistor
connected between SLPE and V
The circuit has an internal current stabilizer operating at a
level determined by resistor R5 connected between STAB
and V
In normal use the value of R5 would be 3.6 k and the
value of R9 would be 20 .
Changing the value of R5 or R9 will affect microphone
gain, DTMF gain, gain control characteristics, sidetone
level, maximum output swing on LN and the DC
characteristics (especially at low line current).
At line currents below 9 mA the internal reference voltage
is automatically adjusted to a lower value (typically 1.6 V
1998 Jan 08
V
I
handbook, full pagewidth
SLPE
ref
LN
Versatile speech/dialler/ringer with
music-on-hold
is the internally generated temperature compensated
=
EE
=
V
.
ref
I
line
+
–
I
SLPE
I
CC
+
R9
I
p
+
, where
0.5 10
V exch
R exch
EE
–
.
3
A
TEA1069
TEA1069A
R line
DC
AC
Fig.4 Supply arrangement.
REG
I SLPE
C3
LN
) can
I line
STAB
0.5 mA
R5
I SLPE
8
at 1 mA). This means that more sets can be operated in
parallel with DC line voltages (excluding the polarity guard)
down to an absolute minimum voltage of 1.6 V. At line
currents below 9 mA the circuit has limited sending and
receiving levels.
Under normal conditions, when I
the static behaviour of the circuit is that of a 3.7 V regulator
diode (V
In the audio frequency range the dynamic impedance is
largely determined by R1. Figure 5 shows the equivalent
impedance of the circuit.
Current (I
peripheral circuits depends on the external components
used. Figure 6 shows this current for V
MUTE is HIGH i.e. when the receiving amplifier (supplied
from V
reduced. Current availability can be increased by
connecting the supply IC TEA1081 in parallel with R1, or
by increasing the DC line voltage by means of an external
resistor (R
LN
SLPE
R9
R1
V CC
CC
0.5 mA
I CC
ref
V EE
) is driven, the available current is further
p
) with an internal resistance equal to that of R9.
VA
) available from V
= R60) connected between REG and SLPE.
C1
TEA1069; TEA1069A
peripheral
circuits
MBH197
CC
I p
for the dialler part and
SLPE
>> I
Product specification
CC
CC
> 2.2 V. When
+ 0.5 mA + I
p
,