TEA1098 Philips Semiconductors, TEA1098 Datasheet - Page 9

• Manufacturer Part Number: TEA1098
• Description: Speech and handsfree IC
• Manufacturer: Philips Semiconductors

Philips Semiconductors
V
The voltage on the V
V
to 3.35 V. This voltage is temperature compensated.
This supply point can provide a current of up to typically
3 mA. Its internal consumption stays low (a few 10 nA) as
long as V
An external voltage can be connected to V
extra consumption on V
source should not be below 3.5 V or above 6 V.
V
the line limits, taking into account the internal current
consumption.
S
The MICS output can be used as a supply for an electret
microphone. Its voltage is equal to 2.0 V; it can source a
current of up to 1 mA and has an output impedance equal
to 200 .
1999 Oct 14
handbook, full pagewidth
DD
BB
BB
UPPLY FOR MICROPHONE
Speech and handsfree IC
voltages
with a difference typically of 250 mV, internally limited
and V
SUPPLY FOR MICROCONTROLLERS
(V)
8
6
4
2
0
DD
0
DD
does not exceed 1.5 V (see Fig.6).
can supply current to external circuits within
DD
0.01
supply point follows the voltage on
DD
(
PINS
(typically 100 A). This voltage
MICS
(
0.02
AND
PIN
V
GNDTX)
DD
DD
)
with limited
Fig.5 Main DC voltages.
0.03
9
L
For line currents below 9 mA, the reference voltage is
automatically adjusted to a lower value; the V
follows the SLPE voltage with a difference of 250 mV.
Any excess current available, other than for the purposes
of DC biasing the IC, will be small. At low reference
voltage, the IC has limited performance.
When voltage V
receive dynamic limiter circuit connected to pin LSAO and
is continuously activated, discharging the capacitor
connected to pin DLC. In the DC condition, the
loudspeaker is then automatically disabled below this
voltage.
When V
low voltage mode irrespective of the logic input levels. This
is a speech mode with reduced performance which only
enables the microphone channel (between the MIC inputs
and pin LN) and the earpiece amplifier. These two
channels are able to deliver signals for line currents as
small as 3 mA. The HFC input is tied to GND sinking a
current of typically 300 A.
OW VOLTAGE BEHAVIOUR
0.04
BB
falls below 2.5 V, the TEA1098 is forced into a
BB
0.05
falls below 2.7 V, it is detected by the
0.06
Product specification
I line (A)
TEA1098
SLPE
V DD
MICS
V BB
FCA049
LN
BB
0.07
voltage