TEA1098ATV PHILIPS [NXP Semiconductors], TEA1098ATV Datasheet - Page 10

• Manufacturer Part Number: TEA1098ATV
• Description: Speech and handsfree IC
• Manufacturer: PHILIPS [NXP Semiconductors]

Philips Semiconductors
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 up to 1 mA and has an output impedance equal to
200 .
L
For line currents below 9 mA, the reference voltage is
automatically adjusted to a lower value; the V
follows the SLPE voltage with 250 mV difference. The
excess current available for other purposes than DC
biasing of the IC becomes small. In this low voltage area,
the IC has limited performances.
When the V
detector of the receive dynamic limiter on pin LSAO acts
continuously, discharging the capacitor connected to
pin DLC. In the DC condition, the loudspeaker is then
automatically disabled below this voltage.
2000 Mar 21
handbook, full pagewidth
OW VOLTAGE BEHAVIOUR
UPPLY FOR MICROPHONE
I DD (A)
Speech and handsfree IC
100.0u
100.0n
100.0p
10.0p
10.0u
10.0n
1.0u
1.0n
1.0
BB
voltage becomes lower than 2.7 V, the V
(
PINS
MICS
1.5
AND
Fig.6 Current consumption on V
GNDTX)
BB
voltage
BB
10
2.0
When V
a low voltage mode whatever the levels on the logic inputs
are. It is a speech mode with reduced performances only
enabling the microphone channel (between the MIC inputs
and 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
typically equal to 300 A.
P
To reduce consumption during dialling or register recall
(flash), the TEA1098A is provided with a power-down input
(PD). When the voltage on pin PD is LOW, the current
consumption from V
typically. Therefore a capacitor of 470 F on V
sufficient to power the TEA1098A during pulse dialling or
flash. The PD input has a pull-up structure. In this mode,
the capacitor C
OWER
-
DOWN MODE
BB
goes below 2.5 V, the TEA1098A is forced into
DD
REG
.
is internally disconnected.
BB
(
PIN
2.5
and V
PD)
DD
is reduced to 460 A
Preliminary specification
V DD (V)
TEA1098A
MGL438
BB
3.0
is