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參數(shù)資料
| 型號： | LMF40 |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 321K |
| 代理商： | LMF40 |
Logic Input-Output Characteristics
(Continued) The following specifications apply for V
b
e
0V unless
otherwise specified.
Boldface limits apply for T
A
e
T
J
e
T
MIN
to T
MAX
:
all other limits T
A
e
T
J
e
25
§
C.
Symbol
Parameter
Conditions
Typical
(Note 10)
Limits
(Note 11)
Units
(Limit)
SCHMITT TRIGGER
(Continued)
V
T
b
Negative Going Input
Threshold Voltage
CLK IN Pin
V
a
e a
10V
1.4 /
1.3
3.8 /
3.9
V (min)
V (max)
V
a
e a
5V
0.7 /
0.6
1.9 /
2.0
V (min)
V (max)
V
T
a b
V
T
b
Hysteresis CLK IN Pin
V
a
e a
10V
2.3 /
2.1
7.4 /
7.6
V (min)
V (max)
V
a
e a
5V
1.1 /
0.9
3.6 /
3.8
V (min)
V (max)
Logical ‘‘1’’ Output
Voltage CLK R
Pin
I
O
e b
10
m
A
V
a
e a
10V
V
a
e a
5V
9.1 /
9.0
4.6 /
4.5
V (min)
V (min)
Logical ‘‘0’’ Output
Voltage CLK R
Pin
I
O
e b
10
m
A
V
a
e a
10V
V
a
e a
5V
0.9 /
1.0
0.4 /
0.5
V (max)
V (max)
Output Source Current
CLK R Pin
CLK R to V
b
V
a
e a
10V
V
a
e a
5V
4.9 /
3.7
1.6 /
1.2
mA (min)
mA (min)
Output Sink Current
CLK R Pin
CLK R to V
a
V
a
e a
10V
V
a
e a
5V
4.9 /
3.7
1.6 /
1.2
mA (min)
mA (min)
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its specified operating range.
Note 2:
All voltages are specified with respect to ground.
Note 3:
The filter’s cutoff frequency is defined as the frequency where the magnitude response is 3.01 dB less than the DC gain of the filter.
Note 4:
For
g
5V supplies the dynamic range is referenced to 2.62 V
rms
(3.7V peak) where the wideband noise over a 20 kHz bandwidth is typically 100
m
V
rms
for
the LMF40. For
g
2.5V supplies the dynamic range is referenced to 0.849 V
rms
(1.2V peak) where the wideband noise over a 20 kHz bandwidth is typically
75
m
V
rms
for the LMF40.
Note 5:
The specifications for the LMF40 have been given for a clock frequency (f
CLK
) of 500 kHz at
g
5V and 250 kHz at
g
2.5V. Above this clock frequency the
cutoff frequency begins to deviate from the specified error band of
g
0.8% over the temperature range, but the filter still maintains its magnitude characteristics.
See Application Information, Section 1.4.
Note 6:
The filter’s magnitude response is tested at the cutoff frequency, f
c
, f
S
e
2 f
c
, and at these other two additional frequencies.
Note 7:
For simplicity all logic levels have been referenced to V
b
e
0V (except for the TTL input logic levels). The logic levels will scale accordingly for
g
5V and
g
2.5V supplies.
Note 8:
The short circuit source current is measured by forcing the output that is being tested to its maximum positive swing and then shorting that output to the
negative supply. The short circuit sink current is measured by forcing the output that is being tested to its maximum negative voltage and then shorting that output
to the positive supply. These are worst case conditions.
Note 9:
The LMF40 is operated with symmetrical supplies and L. Sh. is tied to ground.
Note 10:
Typicals are at T
J
e
25
§
C and represent the most likely parametric norm.
Note 11:
Guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 12:
Human body model; 100 pF discharged through a 1.5 k
X
resistor.
Note 13:
When the input voltage (V
IN
) at any pin exceeds the power supply voltages (V
IN
k
V
b
or V
IN
l
V
a
) the absolute value of the current at that pin should
be limited to 5 mA or less. The 20 mA package input current limits the number of pins that can exceed the power supply voltages with 5 mA current limit to four.
Note 14:
The maximum power dissipation must be de-rated at elevated temperatures and is dictated by T
JMAX
,
i
JA
, and the ambient temperature T
A
. The
maximum allowable power dissipation is PD
e
(T
JMAX
b
T
A
)/
i
JA
or the number given in the Absolute Maximum Ratings, whichever is lower. For the LMF40,
T
JMAX
e
125
§
C, and the typical junction-to-ambient thermal resistance, when board mounted, is 67
§
C/W for the LMF40CIN, 62
§
C/W for the LMF40CIJ and
LMF40CMJ, and 78
§
C/W for the LMC40CIWM.
Note 15:
In popular usage the term cutoff frequency defines that frequency at which a filter’s gain drops 3.01 dB below its DC value. Equations (2) and (3) and
design example 2.1, however, use the term cutoff frequency (f
b
) to define that frequency at which a filter’s gain drops by a variable amount as determined from the
given design specifications.
Note 16:
See AN-450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ for other methods of soldering surface mount devices or see the section
titled ‘‘Surface Mount’’ in the Linear Data Book.
Note 17:
The nominal ratio of the clock frequency to the low-pass cutoff frequency is internally set to 50-to-1 (LMF40-50) or 100-to-1 (LMF40-100).
5
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