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參數(shù)資料
| 型號： | 935263448518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/電話 |
| 英文描述： | SPEAKER PHONE CIRCUIT, PQFP44 |
| 封裝： | PLASTIC, SOT-307, QFP-44 |
| 文件頁數(shù)： | 8/43頁 |
| 文件大小： | 237K |
| 代理商： | 935263448518 |
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1999 Oct 14
16
Philips Semiconductors
Product specication
Speech and handsfree IC
TEA1098
When a dial tone is present on the line, without monitoring,
it would be recognized as noise because it has a constant
amplitude. This would cause the TEA1098 to go into Idle
mode, and the user would hear the dial tone fade away.
To prevent this, a dial tone detector monitors input signals
between pins HFRX and GND. In standard applications,
the detector does not consider a signal level above
25 mV (RMS) to be noise. This level is proportional to the
value of RRSEN. Similarly, a transmit detector monitors
input signals between pins TXIN and GNDTX. In standard
applications the detector does not consider a signal level
above 0.75 mV (RMS) to be noise. This level is
proportional to the value of RTSEN.
Figure 12 shows that the output of the decision logic is a
current source. The logic table shows the relationship
between the input levels and the value of the current
source. The current source can charge or discharge the
capacitor CSWT at a switch-over current of 10 A. If the
current is zero, the voltage on pin SWT becomes equal to
the voltage on pin IDT via the high-ohmic resistor RIDT
(idling). The resulting voltage difference between pins
SWT and IDT can vary between
400 and +400 mV and
determines the TEA1098 mode (see Table 1).
handbook, full pagewidth
MGL345
13 mV
TENV
TNOI
RENV
from logic
from dynamic
limiter
RNOI
Vdt
XX
1
10 A
+10 A
X1
0
X
1X
0
X
XX
1
0
00
0
X
0
Vref
RIDT
CSWT
SWT
28 (25)
27 (24)
(3) 7
(2) 6
(7) 11
(5) 9
IDT
DUPLEX CONTROLLER
LOGIC(1)
ATTENUATOR
Fig.12 Decision logic.
(1) When DLC < 0.2 V,
10 A is forced.
Pin numbers in parenthesis apply to the TEA1098H. Pin numbers not in parenthesis apply to the TEA1098TV.
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