tea1099h NXP Semiconductors, tea1099h Datasheet - Page 7

• Manufacturer Part Number: tea1099h
• Description: Speech And Handsfree Ic With Auxiliary Inputs/outputs And Analog Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
The preferred value for R
will affect more than the DC characteristics; it also
influences the transmit gains to the line, the gain control
characteristic, the sidetone level and the maximum output
swing on the line.
As can be seen from Fig.3, the internal circuitry is supplied
by pin V
the line interface. The line current is flowing through the
R
becoming available for a loudspeaker amplifier or any
peripheral IC. Its voltage is equal to 3.0 V for line currents
lower than 18 mA. It than increases linearly with the line
current and reaches the value of 5.3 V for line currents
greater than 45 mA. It is temperature compensated.
See Fig.4 for the main DC voltages.
1999 Apr 08
handbook, full pagewidth
SLPE
Speech and handsfree IC with auxiliary
inputs/outputs and analog multiplexer
resistor and is sunk by the V
BB
, which is a strong supply point combined with
GND
REG
LN
C REG
4.7 F
SLPE
SLPE
is 20 . Changing this value
BB
TP1
TN1
voltage stabilizer,
R3
R2
preamp
Fig.3 Line interface principle.
from
R1
J1
R SLPE
20
D1
7
J2
The aim of the current switch TR1 and TR2 is to reduce
distortion of large AC line signals. Current I
to V
V
value, the current I
The reference voltage V
an external resistor between pins REG and SLPE.
For large line currents, this increase can slightly affect
some dynamic performances such as maximum signal
level on the line for 2% Total Harmonic Distortion (THD).
The voltage on pin V
resistor.
BB
E1
BB
+ 0.25 V. When the voltage on SLPE is lower than this
via TR1 when the voltage on SLPE is greater than
GND
TR1
TN2
TR2
SLPE
BB
ref
is not affected by this external
is shunted to GND via TR2.
can be increased by connecting
MGM298
E2
GND
Product specification
D1
TEA1099H
V BB
SLPE
is supplied