參數(shù)資料
型號(hào)： LMF60
廠商： National Semiconductor Corporation
英文描述： LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter
中文描述： LMF60高性能6階巴特沃斯低通開(kāi)關(guān)電容濾波器
文件頁(yè)數(shù)： 5/20頁(yè)
文件大小： 391K
代理商： LMF60
Logic Input-Output Characteristics
(Continued)
The following specifications apply for V
b
e
0V (Note 15), L.Sh
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 8)
Limits
(Note 9)
Units
(Limits)
SCHMITT TRIGGER
V
T
a
Positive Going Input
Threshold Voltage
V
a
e
10V
6.1
8.8
/
/
6.0
8.9
V (Min)
V (Max)
V
a
e
5V
3.0
4.3
/
/
2.9
4.4
V (Min)
V (Max)
V
T
b
Negative Going Input
Threshold Voltage
V
a
e
10V
1.4
3.8
/
/
1.3
3.9
V (Min)
V (Max)
V
a
e
5V
0.7
1.9
/
/
0.6
2.0
V (Min)
V (Max)
V
T
a
b
V
T
b
Hysteresis
V
a
e
10V
2.3
7.4
/
/
2.1
7.6
V (Min)
V (Max)
V
a
e
5V
1.1
3.6
/
/
0.9
3.8
V (Min)
V (Max)
V
OH
Logical ‘‘1’’ Voltage
I
O
e b
10
m
A, Pin 11
V
a
e a
10V
V
a
e a
5V
V
a
e a
10V
V
a
e a
5V
CLK R to V
b
V
a
e a
10V
V
a
e a
5V
CLK R to V
a
V
a
e a
10V
V
a
e a
5V
9.1
4.6
/
/
9.0
4.5
V (Min)
V (Min)
V
OL
Logical ‘‘0’’ Voltage
I
O
e b
10
m
A, Pin 11
0.9
0.4
/
/
1.0
0.5
V (Max)
V (Max)
I
SOURCE
Output Source
Current, Pin 11
4.9
1.6
/
/
3.7
1.2
mA (Min)
mA (Min)
I
SINK
Output Sink
Current, Pin 11
4.9
1.6
/
/
3.7
1.2
mA (Min)
mA (Min)
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional. Specified Electrical Characteristics do not apply when operating the device outside its specified conditions.
Note 2:
All voltages are measured with respect to AGND, unless otherwise specified.
Note 3:
When the input voltage (V
IN
) at any pin exceeds the power supply rails (V
IN
k
V
b
or V
IN
l
V
a
) the absolute value of 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 boundaries with 5 mA to four.
Note 4:
The Maximum power dissipation must be derated at elevated temperatures and is dictated by T
J Max
,
i
JA
, and the ambient temperature T
A
. The maximum
allowable power dissipation is PD
e
(T
J Max
b
T
A
)/
i
JA
or the number given in the absolute ratings, whichever is lower. For this device, T
J Max
e
125
§
C, and the
typical junction-to-ambient thermal resistance of the LMF60CCN when board mounted is 67
§
C/W. For the LMF60CIJ this number decreases to 62
§
C/W. For the
LMF60CIWM,
i
JA
e
78
§
C/W.
Note 5:
Human body model: 100 pF discharged through a 1.5 k
X
resistor.
Note 6:
See AN450 ‘‘Surface Mounting Methods and Their Effect on Product Reliability’’ or the section titled ‘‘Surface Mount’’ found in any current Linear Databook
for other methods of soldering surface mount devices.
Note 7:
The specifications given are for a clock frequency (f
CLK
) of 500 kHz at
a
5V and 250 kHz at
g
2.5V. Above this frequency, the cutoff frequency begins to
deviate from the specified error band over the temperature range but the filter still maintains its amplitude characteristics. See application hints.
Note 8:
Typicals are at 25
§
C and represent the most likely parametric norm.
Note 9:
Guaranteed to National’s Average Outgoing Quality Level (AOQL).
Note 10:
The cutoff frequency of the filter is defined as the frequency where the magnitude response is 3.01 dB less than the DC gain of the filter.
Note 11:
The short circuit source current is measured by forcing the output 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 being tested to its maximum negative voltage and then shorting that output to the positive supply. These
are worst case conditions.
Note 12:
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. 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
.
Note 13:
The filter’s magnitude response is tested at the cutoff frequency, f
C
, at f
IN
e
2 f
C
, and at these two additional frequencies.
Note 14:
The LMF60 is operated with symmetrical supplies and L.Sh is tied to GND.
Note 15:
For simplicity all the logic levels (except for the TTL input logic levels) have been referenced to V
b
e
0V. The logic levels will scale accordingly for
g
5V
and
g
2.5V supplies.
Note 16:
The nominal ratio of the clock frequency to the low-pass cutoff frequency is internally set to 50-to-1 (LMF60-50) or 100-to-1 (LMF60-100).
http://www.national.com
5
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