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參數(shù)資料
| 型號： | TEA7063DP |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SPEECH CIRCUIT WITH POWER MANAGEMENT |
| 中文描述： | 語音電路電源管理 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 228K |
| 代理商： | TEA7063DP |
6. CURRENT SOURCE FOR SPEAKERPHONE
6.1 CurrentSource
(pin 12)
Most of the DC current available from the line is
deliveredby the speechcircuit atthe outputI
source
(pin 12) through an internal current generator.
Typical values of this current, l
LS
with R9 = 100K,
are:
I
LS
= (0.3
I
LINE
)
forI
LINE
< 16.5mA
I
LS
= (0.9
I
LINE
-10mA)for I
LINE
> 16.5mA
(ex: I
LINE
= 16mA then I
LS
= 5mA
Figure9
I
LINE
= 30mA then I
LS
= 17mA
I
LINE
= 60mA then I
LS
= 44mA).
The voltage level at pin 12 must be defined by an
external regulator (i.e.: zener) and, if necessary,
filtered with a capacitor(47 to 220
μ
F).
In case V
LINE
(at pin 16) approaches voltage at
pin 12, then the internal current source switches
off and its DC current is shunt to ground through
and internal
complementary generator, thus
avoiding any negative effect on the AC and DC
impedancesof the telephonesetapplication.
5. MICROPROCESSOR INTERFACE
5.1 MicroprocessorSupply (pin 19)
At ”off-hook” the first priority of the circuit is to
make some current available at the Microproces-
sor Supply (pin 19) to charge quickly the external
capacitorC2.
This charging current is I
cpm
= 0.6
I
LINE
T-charge of about 10ms is necessary, with C2 =
47/
μ
F. to charge pin 19 at the specified value of
3.3V typical at I
LINE
= 25mA:
T-charge=3.3V
C2
0.6
I
LINE
typically
V
mp
= 3.3V in normal operation and current in-
creases linearly from 0.5mA min, at I
LINE
= 6mA,
to1.5mA, at I
LINE
= 25mA, remaining stable for
highervalues of I
LINE
. (with R9 = 100K)
In general:
I
mp
=130Volt
R9
+ 0.3mA at I
L
> 25mA
I
mp
=11Volt
R9
+ 0.3mA at I
L
> 6mA
A zener of 3.9V typical is generally suggested to
Figure 8
TEA7063
10/15
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TEA7063FP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SPEECH CIRCUIT WITH POWER MANAGEMENT |
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| TEA7088AFP | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7089 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
| TEA7089A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-RANGE PHONE DEDICATED CHIP |
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