LMF40CIWM-100 National Semiconductor, LMF40CIWM-100 Datasheet

LMF40CIWM-100

Manufacturer Part Number
LMF40CIWM-100
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LMF40CIWM-100

Architecture
Switched Capacitor
Dual Supply Voltage (typ)
±3/±5V
Power Supply Requirement
Single/Dual
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Filter Type
Low Pass Filter
Lead Free Status / RoHS Status
Not Compliant
C 1995 National Semiconductor Corporation
LMF40 High Performance 4th-Order
Switched-Capacitor Butterworth Low-Pass Filter
General Description
The LMF40 is a versatile easy to use precision 4th-order
Butterworth low-pass filter fabricated using National’s high
performance LMCMOS process Switched-capacitor tech-
niques eliminate external component requirements and al-
low a clock-tunable cutoff frequency The 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) A Schmitt
trigger clock input stage allows two clocking options either
self-clocking (via an external resistor and capacitor) for
stand-alone applications or for tighter cutoff frequency con-
trol an external TTL or CMOS logic compatible clock can
be applied The maximally flat passband frequency re-
sponse together with a DC gain of 1 V V allows cascading
LMF40 sections together for higher-order filtering
Block and Connection Diagrams
Ordering Information
TRI-STATE is a registered trademark of National Semiconductor Corporation
Pin numbers in parentheses are for the 14-pin package
Industrial (
LMF40CIN-50 LMF40CIN-100
LMF40CIWM-50
LMF40CIWM-100
Military (
LMF40CMJ-50 LMF40CMJ-100
b
b
55 C
40 C
s
s
T
A s
T
A s
a
TL H 10557
a
125 C)
85 C)
Package
M14B
M14B
N08E
J08A
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Cutoff frequency range of 0 1 Hz to 40 kHz
Cutoff frequency accuracy of
Low offset voltage
Low clock feedthrough of 5 mV
Dynamic range of 88 dB typical
No external components required
8-pin mini-DIP or 14-pin wide-body small-outline pack-
ages
4V to 14V single dual supply operation
Cutoff frequency set by external or internal clock
Pin-compatible with MF4
Communication systems
Instrumentation
Automated control systems
TL H 10557 – 1
Small-Outline-Wide-Body Package
g
100 mV maximum
Dual-In-Line Package
g
P-P
1 0% maximum
Top View
Top View
typical
RRD-B30M115 Printed in U S A
December 1994
g
5V supply
TL H 10557 – 2
TL H 10557 – 3

Related parts for LMF40CIWM-100

LMF40CIWM-100 Summary of contents

Page 1

... LMF40 sections together for higher-order filtering Block and Connection Diagrams Pin numbers in parentheses are for the 14-pin package Ordering Information Industrial ( LMF40CIN-50 LMF40CIN-100 LMF40CIWM-50 LMF40CIWM-100 Military ( 125 LMF40CMJ-50 LMF40CMJ-100 TRI-STATE is a registered trademark of National Semiconductor Corporation C 1995 National Semiconductor Corporation TL H 10557 Features ...

Page 2

... WM Package Vapor Phase (60 sec ) (Note 16) 15V WM Package Infrared (15 sec ) ESD Susceptibility (Note 12 Pin 1 CLK Operating Ratings 500 150 C a Temperature Range LMF40CIN-50 LMF40CIN-100 LMF40CIWM-50 LMF40CIWM-100 LMF40CMJ-50 LMF40CMJ-100 Supply Voltage Range (V 500 kHz Boldface limits apply for Typical Conditions (Note 10) 5 CMJ CIN CIJ CIWM Source ...

Page 3

Filter Electrical Characteristics The following specifications apply for f e CLK Symbol Parameter (Continued Unadjusted DC OS Offset Voltage LMF40-50 LMF40-100 V Output ...

Page 4

Filter Electrical Characteristics The following specifications apply for f CLK Symbol Parameter (Continued Clock to Cutoff CLK c Frequency ...

Page 5

Logic Input-Output Characteristics otherwise specified Boldface limits apply for T Symbol Parameter SCHMITT TRIGGER (Continued) V Negative Going Input b T Threshold Voltage CLK IN Pin V V Hysteresis CLK IN Pin Logical ‘‘1’’ Output ...

Page 6

Typical Performance Characteristics f f Deviation CLK c vs Power Supply Voltage DC Gain Deviation vs Power Supply Voltage f f Deviation CLK c vs Power Supply Voltage DC Gain Deviation vs Power Supply Voltage f f Deviation f CLK ...

Page 7

Typical Performance Characteristics Power Supply Current vs Power Supply Voltage Negative Voltage Swing vs Power Supply Voltage DC Offset Voltage Deviation vs Power Supply Voltage (Continued) Power Supply Current Positive Voltage Swing vs Temperature vs Power Supply Voltage Positive Voltage ...

Page 8

Pin Descriptions (Numbers are for 14-pin package) Pin Pin Function Name 1 CLK IN A CMOS Schmitt-trigger input to be used with an external (1) CMOS logic level clock Also used for self clocking Schmitt- trigger oscillator ...

Page 9

LMF40 Application Information 1 2 POWER SUPPLY The LMF40 can be powered from a single supply or split supplies The split supply mode shown in Figure 2 is the most flexible and easiest to implement Supply voltages of ...

Page 10

Designing with the LMF40 Likewise the attenuation at f can be found using (3) with s the above values and Attn (2 kHz) 10 log kHz 1 kHz) e ...

Page 11

Designing with the LMF40 (a) FIGURE 2 Split Supply Operation with CMOS Level Clock (a) and ...

Page 12

Designing with the LMF40 TL H 10557– 13 FIGURE 5a LMF40-100 Amplitude Response with 5V Supplies g FIGURE 6 Design Example Magnitude Response Specification The response of the filter design must fall within the shaded area of the ...

Page 13

Designing with the LMF40 FIGURE 8a One LMF40-50 vs Two LMF40-50s Cascaded FIGURE 9 LMF40-50 Abrupt Clock Frequency Change (Continued) FIGURE 7 Cascading Two LMF40s FIGURE 8b Phase Response of Two Cascaded LMF40-50s TL H 10557 – 20 ...

Page 14

Designing with the LMF40 (a) Input Signal Spectrum FIGURE 11 The phenomenon of aliasing in sampled-data systems An input signal whose frequency is greater than one-half the sampling frequency will cause an output to appear at a frequency ...

Page 15

... Physical Dimensions inches (millimeters) Order Number LMF40CMJ-50 or LMF40CMJ-100 Order Number LMF40CIWM-50 or LMF40CIWM-100 NS Package Number J08A NS Package Number M14B 15 ...

Page 16

... Hong Kong Ltd 49) 0-180-530 85 86 13th Floor Straight Block a Ocean Centre 5 Canton Rd 49) 0-180-530 85 85 Tsimshatsui Kowloon a Tel ( 49) 0-180-532 78 32 Hong Kong a 49) 0-180-532 93 58 Tel (852) 2737-1600 a Tel ( 49) 0-180-534 16 80 Fax (852) 2736-9960 a National Semiconductor Japan Ltd Tel 81-043-299-2309 Fax 81-043-299-2408 ...

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