tea1097h NXP Semiconductors, tea1097h Datasheet - Page 10

• Manufacturer Part Number: tea1097h
• Description: Speech And Loudspeaker Amplifier Ic With Auxiliary Inputs/outputs And Analog Multiplexer
• Manufacturer: NXP Semiconductors

Philips Semiconductors
S
The MICS output can be used as a supply for an electret
microphone. Its voltage is equal to 2 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 pin LSAO acts continuously,
discharging the capacitor at pin DLC. In the DC condition,
the loudspeaker is automatically disabled below this
voltage.
1999 Apr 08
handbook, full pagewidth
OW VOLTAGE BEHAVIOUR
UPPLY FOR MICROPHONE
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
(pA)
I DD
10
10
10
10
10
10
10
10
8
7
6
5
4
3
2
1.0
BB
voltage reaches 2.7 V, the V
(
PINS
MICS
1.5
AND
Fig.6 Current consumption on V
GNDTX)
BB
BB
detector of
voltage
10
2.0
When V
forced in 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 equal to 300 A (typ.).
P
To reduce current consumption during dialling or register
recall (flash), the TEA1097 is provided with a power-down
input (PD). When the voltage on pins PD and AUXC is
LOW, the current consumption from V
reduced to 460 A (typ.). Therefore a capacitor of 470 F
connected to pin 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
OWER
-
DOWN MODE
BB
becomes lower than 2.5 V, the TEA1097 is
DD
.
BB
(
PINS
is sufficient to power the TEA1097
2.5
REG
PD
is internally disconnected.
AND
V DD (V)
AUXC)
Product specification
BB
and V
TEA1097
FCA050
DD
3.0
is