tea1099h NXP Semiconductors, tea1099h Datasheet - Page 9

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

Philips Semiconductors
S
The MICS output can be used as a supply for electret
microphones. Its voltage is equal to 2.0 V; it can source
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
the receive dynamic limiter on LSAO acts and discharges
the DLC capacitor. The loudspeaker is then automatically
disabled below this DC voltage.
When V
forced into 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.
1999 Apr 08
OW VOLTAGE BEHAVIOUR
UPPLY FOR MICROPHONE
handbook, full pagewidth
Speech and handsfree IC with auxiliary
inputs/outputs and analog multiplexer
(pA)
I DD
BB
10
10
10
10
10
10
10
10
8
7
6
5
4
3
2
1.0
becomes lower than 2.5 V, the TEA1099H is
BB
voltage reaches 2.7 V, the V
(
PINS
MICS
1.5
AND
Fig.5 Current consumption on V
GNDTX)
BB
BB
detector of
voltage
9
2.0
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 current consumption during dialling or register
recall (flash), the TEA1099H is provided with a
power-down input (PD). When the voltage on both pins PD
and AUXC is LOW, the current consumption from V
V
of 470 F on V
during pulse dialling or flash. The PD input has a pull-up
structure, while AUXC has a pull-down structure. In this
mode, the capacitor C
R
The TEA1099H is designed to be activated during the
ringing phase. The loudspeaker amplifier can be used for
the ringing signal. The IC must be powered by an external
supply on ESI, while applying a HIGH level on the logic
input AUXC and a LOW level on PD input. Only the HFRX
input and the LSAO output are activated, in order to limit
the current consumption. Some dynamic limitation is
provided to prevent the LSAO output from saturation and
V
OWER
DD
BB
INGER MODE
from being discharged below 2.7 V.
is reduced to 460 A typically. Therefore a capacitor
-
DOWN MODE
DD
(
PINS
BB
.
is sufficient to power the TEA1099H
ESI, V
(
PINS
REG
2.5
PD
BB
is internally disconnected.
, AUXC
AND
AUXC)
V DD (V)
AND
Product specification
TEA1099H
PD)
FCA050
3.0
BB
and