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參數(shù)資料
| 型號(hào)： | L6372 |
| 英文描述： | OCTAL INDUSTRIAL INPUT INTERFACE(253.91 k) |
| 中文描述： | 八路工業(yè)輸入接口（253.91十一） |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 253K |
| 代理商： | L6372 |
Frequency Generation
-
Internal
If the local oscillator is used, the pin Osc will
be connected to a capacitor C, grounded on
the otherside.
The oscillation is achieved by an internal cur-
rent generator, that repeatedly charges and
discharges the capacitor C between two volt-
age levels (V
hosc
and V
losc
, typically 3.5V and
1.5V). The current has the same absolute
value (I
chg
) both during the charge and dis-
charge phase.
I
chg
is obtained mirroring the current that
flows through R
ref
(1.26V/R
ref
),with a coeffi-
cient of 0.457, so that, for instance, if R
ref
is
12K
, I
chg
is typically50
μ
A.
The frequencycan be calculatedas:
F
osc
=
I
chg
2
C
(
V
hosc
V
losc
)
For instance, if R
re
f = 12K
and C = 1.2nF,
F
OSC
is about 10KHz.
The method to determine F
OSC
indicatedhere
abovegives the value to be expectedwith the
highest probability. All the positive causes of
deviation in the chip, including V
S
and T
j
, will
not, in practice, combine and create a devia-
tion, from such calculated F
OSC
value, in ex-
cess of
±
12%.
-
External
If an external signal is to be used, it will be
fed directly into the Osc pin, without any ca-
pacitor for oscillation purposes. The internal
impedance of the generator of such signal
must be low enough to override I
chg
, and the
voltage swing must exceed the upper (V
hosc
)
and lower (V
Iosc
) thresholds. In order to have
a margin, add 20% to the I
chg
value calcu-
lated with the formula
I
chg
=(
0.457
1.26V
)
R
ref
and use for V
losc
andV
hosc
the extreme
values given in the datasheet.
FilterOperation
Each filter is a synchronousstate machine, with 8
significant states, clocked by the oscillator fre-
quencydivided by 8.
In 4 states (0XX) the output is 0, in the other 4
states(1XX) the outputis 1.
At the chip start-up(power-on reset) or in case of
overtemperaturethe fundamental0 state is forced
( it corresponds to the reset of the filter state).
When the normal operation of the chipis allowed,
the input to the filter generatesthe following tran-
sition table:
Figure5:
Input ChannelCharacteristics
L6372
10/15
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