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LMF60 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMF60
Description  LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMF60 Datasheet(HTML) 5 Page - National Semiconductor (TI)

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Logic Input-Output Characteristics (Continued)
The following specifications apply for Vb e 0V (Note 15) LSh e 0V unless otherwise specified Boldface limits apply for TA
e
TJ e TMIN to TMAX all other limits TA e TJ e 25 C
Symbol
Parameter
Conditions
Typical
Limits
Units
(Note 8)
(Note 9)
(Limits)
SCHMITT TRIGGER
VTa
Positive Going Input
V
a
e
10V
61
60
V (Min)
Threshold Voltage
88
89
V (Max)
V
a
e
5V
30
29
V (Min)
43
44
V (Max)
VTb
Negative Going Input
V
a
e
10V
14
13
V (Min)
Threshold Voltage
38
39
V (Max)
V
a
e
5V
07
06
V (Min)
19
20
V (Max)
VTa bVTb
Hysteresis
V
a
e
10V
23
21
V (Min)
74
76
V (Max)
V
a
e
5V
11
09
V (Min)
36
38
V (Max)
VOH
Logical ‘‘1’’ Voltage
V
a
ea
10V
91
90
V (Min)
IO eb10 mA Pin 11
V
a
ea
5V
46
45
V (Min)
VOL
Logical ‘‘0’’ Voltage
V
a
ea
10V
09
10
V (Max)
IO eb10 mA Pin 11
V
a
ea
5V
04
05
V (Max)
ISOURCE
Output Source
CLK R to V
b
Current Pin 11
V
a
ea
10V
49
37
mA (Min)
V
a
ea
5V
16
12
mA (Min)
ISINK
Output Sink
CLK R to V
a
Current Pin 11
V
a
ea
10V
49
37
mA (Min)
V
a
ea
5V
16
12
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 (VIN) at any pin exceeds the power supply rails (VIN k Vb or VIN l Va) 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 TJ Max iJA and the ambient temperature TA The maximum
allowable power dissipation is PD e (TJ Max b TA) iJA or the number given in the absolute ratings whichever is lower For this device TJ Max e 125 C and the
typical junction-to-ambient thermal resistance of the LMF60CCN when board mounted is 67 CW For the LMF60CIJ this number decreases to 62 CW For the
LMF60CIWM iJA e 78 CW
Note 5
Human body model 100 pF discharged through a 15 kX 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 (fCLK) of 500 kHz at a5V and 250 kHz at g25V 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 301 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 g5V supplies the dynamic range is referenced to 262 Vrms (37V peak) where the wideband noise over a 20 kHz bandwidth is typically 100 mV For
g
25V supplies the dynamic range is referenced to 0849 Vrms (12V peak) where the wideband noise over a 20 kHz bandwidth is typically 75 mVrms
Note 13
The filter’s magnitude response is tested at the cutoff frequency fC atfIN e 2fC and at these two additional frequencies
Note 14
The LMF60 is operated with symmetrical supplies and LSh is tied to GND
Note 15
For simplicity all the logic levels (except for the TTL input logic levels) have been referenced to Vb e 0V The logic levels will scale accordingly for g5V
and g25V 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)
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