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參數(shù)資料
| 型號： | TEA7092 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | TELEPHONE ANALOG FRONT END |
| 中文描述： | 電話模擬前端 |
| 文件頁數(shù)： | 50/57頁 |
| 文件大?。?/td> | 574K |
| 代理商： | TEA7092 |
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R37
R35
+
C6
D2
R38
C30
I(V
ZP
)
R32
R36
V
RING
D3
R33
D7
T1
T2
L1
+
C1
38
40
1
RSU
V
LS
V
ZP
11.2V
24V
5.6V
150k
2.6V
150k
26kHz
LOGIC
CONTROL
I
VZP
Info
1.2V
LOGIC
CONTROL
RI
V
LS
> 2.6V
V
RMC
> 2.6V
SERIAL
REGULATOR
8
VRMC
+
C15
135k
90k
100
μ
A
I/17.5k
40k
RI
6
LSSOF
R31
C19
LS AMP
(V
LS
- VLSOUT) < 0.2V
44
LSOUT
+
C2
Fi Ring
V
IN
I
A
= f{(I
VZP
)}
41
RCO
R40
C4
Gain = 16
TEA7092
39
SWP
A
Figure66
VI - RINGER FEATURES
VI.1 - RingerPower Supply
In ring mode only the ring part, the loudspeaker
amplifier, the logic part and the microcontroller
supply are powered.
The supply is provided by a switch mode power
supply.
Figure 66 showsthe ringpart.
The switch mode power supply converts the high
ac ring line voltage, 30 to 90V
RMS
at 25 or 50Hz,
into a low DC voltage, 3 to 5.6V,which is used to
supplytheloudspeakeramplifierandthemicrocon-
troller.The switchmode powersupplymadeby T1,
T2, L1, D7 and the resistors associated, is driven
through the Pin SWP(Pin 39).
The control on SWP is done by a 26kHz oscillator.
The coil L1 is 1mH, the diode D7 is a 1N4148.
VI.2 - Start-UpThreshold Level
By default, the ring thresholdlevel is internally set
up at 18.8VDC on Pin RSU (Pin 40) :
(3 x 5.6V + V
BE
(0.6V) + 2 x V
THN
(2 x 0.7V)),
equivalentto an AC ringlevel of 13.3V
RMS
.
Assoonas this thresholdlevel is reached,is a11.2V
hysteresisisintroducedtoassurethesystem’sstability
The V
RING1
start up level is set up on
Pin RSU (Pin 40) with R35 and if neccessary a
zener diode D5 added in serial with R35, most of
the countriesdon’t requestD5.
V
RING1
: Start up level.
V
RING1
=
18.8
+
Note :
Recommended value for R35is 56k
.
R35
300k
0.7
+
V
Z
(
D5
)
in V
TEA7092 - TELEPHONE SET INTEGRATED CIRCUIT
50/57
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PDF描述 |
|---|---|
| TEA7092TQ | TELEPHONE ANALOG FRONT END |
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