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參數(shù)資料
| 型號： | TEA1099H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Speech and handsfree IC with auxiliary inputs/outputs and analog multiplexer |
| 中文描述： | TELEPHONE SPEECH CKT, PQFP44 |
| 封裝： | 10 X 10 MM, 1.75 MM HEIGHT, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 9/40頁 |
| 文件大?。?/td> | 185K |
| 代理商： | TEA1099H |
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1999 Apr 08
9
Philips Semiconductors
Product specification
Speech and handsfree IC with auxiliary
inputs/outputs and analog multiplexer
TEA1099H
Fig.5 Current consumption on V
DD
.
handbook, full pagewidth
(pA)
10
7
1.0
1.5
2.5
3.0
VDD (V)
2.0
8
10
6
10
5
10
4
10
3
10
2
10
FCA050
S
UPPLY FOR MICROPHONE
(
PINS
MICS
AND
GNDTX)
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
OW VOLTAGE BEHAVIOUR
For line currents below 9 mA, the reference voltage is
automatically adjusted to a lower value; the V
BB
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 V
BB
voltage reaches 2.7 V, the V
BB
detector of
the receive dynamic limiter on LSAO acts and discharges
the DLC capacitor. The loudspeaker is then automatically
disabled below this DC voltage.
When V
BB
becomes lower than 2.5 V, the TEA1099H 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
μ
A.
P
OWER
-
DOWN MODE
(
PINS
PD
AND
AUXC)
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
BB
and
V
DD
is reduced to 460
μ
A typically. Therefore a capacitor
of 470
μ
F on V
BB
is sufficient to power the TEA1099H
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
REG
is internally disconnected.
R
INGER MODE
(
PINS
ESI, V
BB
, AUXC
AND
PD)
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
BB
from being discharged below 2.7 V.
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