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TEA1098A Arkusz danych(PDF) 10 Page - NXP Semiconductors

Numer części TEA1098A
Szczegółowy opis  Speech and handsfree IC
Download  40 Pages
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1098A Arkusz danych(HTML) 10 Page - NXP Semiconductors

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2000 Mar 21
10
Philips Semiconductors
Preliminary specification
Speech and handsfree IC
TEA1098A
Fig.6 Current consumption on VDD.
handbook, full pagewidth
1.0
IDD (A)
1.5
2.5
3.0
VDD (V)
2.0
100.0u
10.0u
100.0n
10.0n
1.0u
10.0p
1.0n
100.0p
MGL438
SUPPLY FOR MICROPHONE (PINS MICS AND GNDTX)
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
Ω.
LOW VOLTAGE BEHAVIOUR
For line currents below 9 mA, the reference voltage is
automatically adjusted to a lower value; the VBB voltage
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 VBB voltage becomes lower than 2.7 V, the VBB
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.
When VBB goes below 2.5 V, the TEA1098A is 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. 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
µA.
POWER-DOWN MODE (PIN PD)
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 VBB and VDD is reduced to 460 µA
typically. Therefore a capacitor of 470
µF on VBB is
sufficient to power the TEA1098A during pulse dialling or
flash. The PD input has a pull-up structure. In this mode,
the capacitor CREG is internally disconnected.


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