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參數(shù)資料
| 型號(hào)： | 935263449112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | SPEAKER PHONE CIRCUIT, PDSO40 |
| 封裝： | PLASTIC, SOT-158, VSOP-40 |
| 文件頁數(shù)： | 43/43頁 |
| 文件大?。?/td> | 237K |
| 代理商： | 935263449112 |
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1999 Oct 14
9
Philips Semiconductors
Product specication
Speech and handsfree IC
TEA1098
handbook, full pagewidth
0.07
0.06
8
6
2
0
0.01
voltages
(V)
0.02
0.05
MICS
VDD
VBB
SLPE
LN
Iline (A)
0.04
0.03
4
FCA049
Fig.5 Main DC voltages.
VDD SUPPLY FOR MICROCONTROLLERS (PIN VDD)
The voltage on the VDD supply point follows the voltage on
VBB with a difference typically of 250 mV, internally limited
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 VDD does not exceed 1.5 V (see Fig.6).
An external voltage can be connected to VDD with limited
extra consumption on VDD (typically 100 A). This voltage
source should not be below 3.5 V or above 6 V.
VBB and VDD can supply current to external circuits within
the line limits, taking into account the internal current
consumption.
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 of up to 1 mA and has an output impedance equal
to 200
.
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 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 VBB falls below 2.7 V, it is detected by the
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 VBB falls below 2.5 V, the TEA1098 is forced into a
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.
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