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參數(shù)資料
| 型號： | TEA7092TQ |
| 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)： | 17/57頁 |
| 文件大?。?/td> | 574K |
| 代理商： | TEA7092TQ |
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I
L
(mA)
0
20
10
40
30
60
50
80
70
100
90
I
L
(
I
LS
Ip
IVMC
0
20
40
60
80
100
120
0
2
4
6
8
10
A
Figure21
II - SPEECHFEATURES
(continued)
II.1.4 - Further Information
(V
CC
/ V
REF
/ I
REF
/ V
MC
/ V
RMC
/ V
LS
/ V
REFL
)
For moreinformation on thesepins see Section I.4 - Input/outputConfigurations.
V
CC
(Pin 26) , V
REF
(Pin25) , I
REF
(Pin 29)
The V
CC
supplies the transmit path, handset and
handfree microphone amplifiers, the receive path,
earphoneamplifier and thetransmit squelch/antia-
coustic feedbackstage.
The current consumptionon this pin, I
P
, is 1.3mA
at a20mA line current (see Figure 21).
From the V
CC
supply, the V
REF
stageis built. V
REF
is usedasan AC ground forall thestagespowered
from V
CC
.
The outputcurrent compliance of V
REF
is :
±
1mA.
The referencevoltage at V
REF
is : V
CC
/2.
I
REF
Pin is used as an internal current reference.
The R2 value is fixedand should not be modified.
It is recommended to connecta
±
1%resistor value
on thispin.
The voltage at I
REF
pin has a 300mV constant
value.
V
MC
(Pin2) , V
RMC
(Pin 8)
These 2 pins supply the microcontroller. These
2 pinsare connectedthrough a serial regulator.
On V
MC
a 470
μ
F capacitor is connected, this ca-
pacitor is chargedonly when TEA7092 ispowered
from Pin V
L
(Pin3) (OFF-HOOKstate) and is used
to power supply the microcontroller during pulse
dialing, flash and earth button, when the line loop
is open.
As described in Section II.1.3, this capacitor is
quicklycharged during the ”Start up” condition.
The DC value at V
MC
is :
V
MC
= V
L
- 0.4V
and is internally limited at 6V max.
V
RMC
is powered from the highest DC value be-
tween Pin V
LS
(Pin 1) and Pin V
MC
(Pin 2) in
OFF-HOOK state or from Pin V
LS
(Pin 1) in ring
mode.
V
RMC
is a 3.5Vstabilized power supply.
V
RMC
suppliesthe oscillator, the logic part (Micro-
controllerinterface, errorbeep, and ring frequency
generators) and the logic part of the D.A.C. used
for the waiting melody and the DTMF generators.
Thecurrentconsumptiononthispinis 250
μ
Awhen
the oscillator is ONand 50
μ
Awhen theoscillator is
OFF code (0111010)is sent.
Note :
To reduce the C10 value connected at
PinV
MC
(Pin 2), it is recommended to inhibit the
oscillatorduringthe pulse dialingandflash signali-
zations.
In ring mode only the 4.7
μ
F capacitor connected
on Pin V
RMC
(Pin8) is charged to achievea short
delay to generate the ring signal on the loud-
speaker.
V
LS
(Pin1) , V
REFL
(Pin 4)
The V
LS
supplies the loudspeaker amplifier part.
The current source,I
LS
, betweenthe Pin V
L
(Pin3)
and the Pin V
LS
(Pin 1) gives the main part of the
line current to supply the loudspeaker amplifier
(seeFigure 21) :
I
LS
= 0.74 x I
L
- 1.8mA; for I
L
< 15mA
I
LS
= 0.92 x I
L
- 4.5mA; for I
L
> 15mA
The internal current consumption on V
LS
is 1mA,
so the current I
LS1
available for the loudspeaker
and other peripheralsis :
I
LS1
= I
LS
- 1mA
The DC value at V
LS
depends of the DC value at
PinV
L
(Pin3) and is equal to :
V
LS
(Pin1) = V
L
(Pin3) - (0.95 + 10 x I
LS
) Volts
From the V
LS
supply,the V
REFL
stage is built. The
V
REFL
is buffered in order to be used as an AC
ground for all the stagespowered from V
LS
.
The reference voltageat V
REFL
is : V
LS
/2.
TEA7092 - TELEPHONE SET INTEGRATEDCIRCUIT
17/57
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