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參數(shù)資料
| 型號： | TEA7092TQT |
| 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)： | 54/57頁 |
| 文件大?。?/td> | 574K |
| 代理商： | TEA7092TQT |
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V
RING
(V)
0
2
4
6
8
U
RCO(Pin 41)
V
PP
(LSOUT)
V
LS
(Pin1)
0
10
20
30
40
50
1
3
5
7
NO
WORKING
AREA
A
Figure 71
VI - RINGER FEATURES
(continued)
VI.4 - Output Power Optimization
(continued)
The principle is :
- From the current I(V
ZP
) in the resistor R37, a
current IAis issued and equal to :
I
(
V
ZP
)
39
μ
A
2.6
I
A
=
R38
9
(1)
The 39
μ
Acurrent is the biascurrent of the internal
2.6V zener connectedon Pin V
ZP
(Pin38).
I
(
V
ZP
)
=
V
RING
2.6
R37
- The current IA generates a voltage on
Pin RCO (Pin 41)equal to :
V(RCO) = R40 x IA (3)
- This input voltage, mixed with the ring frequency
is amplified to the loudspeakerconnectedon pin
LSOUT (Pin 44), and the peak to peak square
output voltageV
PP
(LSOUT) is :
V
PP
(LSOUT) = 16 x V(RCO) (4)
(1), (2), (3) & (4)
V
PP
(
LSOUT
) =
16
9
When the V
RING
input voltage is high enough
to
saturate
the
Pin LSOUT(Pin 44), compared to PinV
LS
(Pin1),
(V
LS
(Pin 1) - V
PP
(LSOUT) < 0.2V), the switch in
serial with thecurrentsourceonPinLSSOF(Pin 6)
is activated, and the input voltage on
Pin LSSOF (Pin 6) is convertedin current, with a
1/17.5k
transconductance. Finally this current
increases the voltage on Pin V
LS
(Pin 1) and al-
lows the output voltage, V
PP(LSOUT)
Pin LSOUT (Pin 44) to increase.
At low V
RING
input voltage, Pin V
LS
(Pin 1) is
clamped at a 3V minimum voltage, to maintain a
proper supply to the microcontroller on
Pin V
RMC
(Pin 8), and the output voltage on
Pin LSOUT(Pin44) is progressivelyreduced.
When the V
RING
input voltage increases, the
Pin V
LS
(Pin 1) increasesup to 6V and is clamped
to 6V by an internal zener.
(2)
R40
V
RING
R37
39
μ
A
2.6
R35
//
R38
output
stage
on
on
The Figure 71 gives thevoltage on PinV
LS
(Pin1),
on Pin RCO (Pin 41) and the V
PP(LSOUT)
on
PinLSOUT (Pin44) versusthe V
RING
inputvoltage
with : R37 = 200k
, R38= 150k
, R40 = 47k
The values of R37, R38and R40should be calcu-
late to adapt the output power requested on
PinLSOUT (Pin 44) to the available power,during
ring mode, on the terminal wire as described on
Figures69 and 70 of thisapplicationnote.
The recommended values for a ring network of,
C
RING
= 1
μ
F, R
RING
= 1.5k
are :
- R37 =200k
, R38= 150k
- P40 = 47k
,
if f
RING
= 25 or50Hz / R
LOUDSPEAKER
= 50
-R40=39k
, iff
RING
=50Hz/R
LOUDSPEAKER
=32
-R40=33k
, iff
RING
=25Hz/R
LOUDSPEAKER
=32
VI.5 - MicrocontrollerManagement
(RI / RESET)
In ring mode, two pieces of information are given
to control the microcontroller :
- PinRESET(Pin 11)which goesat level”1” if Pin
V
RMC
(Pin8) >2.6V.
- Pin RI/VI (Pin 10) which goes at level ”1” if :
Pin RSU (Pin 40) > 19V
Pin V
RMC
(Pin 8) > 2.6V
Currentin Pin V
ZP
(Pin 38) > 40
μ
A
- After a ring mode, Pin RI/VI (Pin 10) goes back to
level”0”,if PinRSU (Pin 40)goeslower than8V.
TEA7092 - TELEPHONE SET INTEGRATED CIRCUIT
54/57
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