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參數(shù)資料
| 型號： | TEA1097H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | Speech and loudspeaker amplifier 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, SOT-307-2, QFP-44 |
| 文件頁數(shù)： | 10/36頁 |
| 文件大?。?/td> | 167K |
| 代理商： | TEA1097H |
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1999 Apr 08
10
Philips Semiconductors
Product specification
Speech and loudspeaker amplifier IC with
auxiliary inputs/outputs and analog multiplexer
TEA1097
Fig.6 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 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
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 pin LSAO acts continuously,
discharging the capacitor at pin DLC. In the DC condition,
the loudspeaker is automatically disabled below this
voltage.
When V
BB
becomes lower than 2.5 V, the TEA1097 is
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
μ
A (typ.).
P
OWER
-
DOWN MODE
(
PINS
PD
AND
AUXC)
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
BB
and V
DD
is
reduced to 460
μ
A (typ.). Therefore a capacitor of 470
μ
F
connected to pin V
BB
is sufficient to power the TEA1097
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.
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