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參數(shù)資料
| 型號(hào)： | TEA7063 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SPEECH CIRCUIT WITH POWER MANAGEMENT |
| 中文描述： | 語(yǔ)音電路電源管理 |
| 文件頁(yè)數(shù)： | 5/15頁(yè) |
| 文件大?。?/td> | 228K |
| 代理商： | TEA7063 |
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CIRCUIT DESCRIPTION
1. DC CHARACTERISTICS
1.1 V
C
(pin 17)
The stabilized voltage VC is connected to Vline
(pin 16) through an internal shunt regulator T1,
T2, which presents to the line a high AC imped-
ance at frequecncies higher than 200Hz. At this
purpose the value of C1 (at pin 17) must be not
lower than 47
μ
F (suggestedvalue is 100
μ
F).
The shunt regulator, T1 and T2, also controls the
extra current source, or power management, at
pin 12 (seealso paragraph6).
1.2 V
LINE
(pin 16)
The line voltage (pin 16) is determined by the
value of the external resistor R6 and by the inter-
nal current, I
int
, flowing between V
C
(pin 17) and
Ground (seealso paragr.: 1.1):
V
LINE
= V
C
+ R 6 x I
int
V
C
is fixed by designat about2.5V.
I
int
is reversely related to R9:
I
int
= 8 Volt/R9+ 60
μ
A at I
L
> 25mA
I
int
= 4 Volt/R9+ 60
μ
A at I
L
= 6mA
where I
L
depends on I
LB
(see supply manage-
ment)
V
LINE
must be externally adjusted (with R6) to
guarantee both DC and AC characteristic in ac-
cordance to the specific standard of the different
adminastrations.
Another adjustment of the DC characteristic is
possible with R9. Increasing the value of R9
causes a decrease of I
int
and consequently a re-
duction of the product I
int
x R9. (see also Para-
graph7)
Figure2
Figure1
TEA7063
5/15
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