LMF90CIN National Semiconductor, LMF90CIN Datasheet

LMF90CIN

Manufacturer Part Number
LMF90CIN
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of LMF90CIN

Architecture
Switched Capacitor
Single Supply Voltage (typ)
5V
Dual Supply Voltage (typ)
±3/±5V
Power Supply Requirement
Single/Dual
Operating Temperature (min)
-40C
Operating Temperature (max)
85C
Package Type
MDIP
Lead Free Status / RoHS Status
Not Compliant
C 1995 National Semiconductor Corporation
LMF90
4th-Order Elliptic Notch Filter
General Description
The LMF90 is a fourth-order elliptic notch (band-reject) filter
based on switched-capacitor techniques No external com-
ponents are needed to define the response function The
depth of the notch is set using a two-level logic input and
the width is programmed using a three-level logic input Two
different notch depths and three different ratios of notch
width to center frequency may be programmed by connect-
ing these pins to V
logic pin sets the ratio of clock frequency to notch frequen-
cy
An internal crystal oscillator is provided Used in conjunction
with a low-cost color TV crystal and the internal clock fre-
quency divider a notch filter can be built with center fre-
quency at 50 Hz 60 Hz 100 Hz 120 Hz 150 Hz or 180 Hz
for rejection of power line interference Several LMF90s can
be operated from a single crystal An additional input is pro-
vided for an externally-generated clock signal
Features
Y
Typical Connection
Center frequency set by external clock or on-board
clock oscillator
a
ground or V
TL H 10354
60 Hz Notch Filter
b
Another three-level
Y
Y
Y
Key Specifications
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Y
No external components needed to set response char-
acteristics
Notch width attenuation and clock-to-center-frequency
ratio independently programmable
14 pin 0 3 wide package
f
f
Supply voltage range
Passband Ripple (typ)
Attenuation at f
f
Notch Bandwidth (typ)
Output offset voltage (max)
Automatic test equipment
Communications
Power line interference rejection
0
0
CLK
Range
accuracy over full temperature range (max)
f
0
TL H 10354 – 1
0
(typ)
g
Connection
Diagram
Order Number LMF90CCN
39 dB or 48 dB (selectable)
LMF90CCWM LMF90CIJ
0 127 f
See NS Package Number
2V to
LMF90CCJ LMF90CIN
Dual-In-Line and Small
J14A M14B or N14A
Outline Packages
LMF90CMJ 883
100 1 50 1 or 33 3 1
LMF90CMJ or
LMF90CIWM
g
0
RRD-B30M115 Printed in U S A
Top View
7 5V or 4V to 15V
0 26 f
0 1 Hz to 30 kHz
December 1994
0
TL H 10354 – 2
or 0 55 f
0 25 dB
120 mV
1 5%
0

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LMF90CIN Summary of contents

Page 1

... Automatic test equipment Y Communications Y Power line interference rejection Y Connection Diagram Dual-In-Line and Small Outline Packages Top View Order Number LMF90CCN LMF90CIWM LMF90CCWM LMF90CIJ LMF90CCJ LMF90CIN LMF90CMJ or LMF90CMJ 883 TL H 10354 – 1 See NS Package Number J14A M14B or N14A RRD-B30M115 Printed December 1994 120 mV ...

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DC Electrical Characteristics Note 1 Absolute Maximum Ratings indicate limits beyond which damage to the device may occur Note 2 Operating Ratings indicate conditions for which the device is intended to be functional These ratings do not guarantee specific performance ...

Page 8

Typical Performance Characteristics Notch Depth vs Clock Frequency Power Supply Current vs Power Supply Voltage Offset Voltage vs Supply Voltage Passband Width vs Supply Voltage Notch Depth vs Notch Depth Supply Voltage vs Temperature Power Supply Current Offset Voltage vs ...

Page 9

Typical Performance Characteristics Stopband Width vs Supply Voltage Clock-to-Center-Frequency Ratio Deviation vs Supply Voltage Positive Output Voltage Swing vs Load Resistance (Continued) Clock-to-Center-Frequency Stopband Width Ratio Deviation vs Temperature vs Clock Frequency Clock-to-Center-Frequency Ratio Deviation Output Swing vs Temperature vs ...

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Pin Descriptions W (Pin 1) This three-level logic input sets the width of the notch Notch width When W is tied to V (pin 14) GND (pin b 13 (pin 8) the ...

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Definition of Terms (Continued) Passband Gain the notch filter’s gain for signal frequen- cies near The passband gain of a notch filter is CLK also called ‘‘H ’’ For the LMF90 the passband gain ...

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Applications Information 2 2 PROGRAMMING PINS The LMF90 has five control pins that are used to program the filter’s characteristics via a three-level logic scheme In dual-supply applications these inputs are tied to either ...

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Applications Information ALIASING Another important characteristic of sampled-data systems is their effect on signals at frequencies greater than one-half the sampling frequency (The LMF90’s sampling frequency is the same as the filter’s clock frequency This is the fre- ...

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Applications Information NOISE Switched-capacitor filters have two kinds of noise at their outputs There is a random ‘‘thermal’’ noise component whose level is typically on the order of hundreds of micro- volts The other kind of noise is ...

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Applications Information DUAL-SUPPLY CLOCK OPTIONS FIGURE 6 Dual supply external CMOS-level clock Internal frequency divider disabled FIGURE 7 Dual supply TTL-level clock Internal frequency divider disabled (Continued 10354– 10354– 11 ...

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Applications Information DUAL-SUPPLY CLOCK OPTIONS FIGURE 8 Dual Supply external CMOS-level clock Internal frequency divider enabled Output of logic divider available on pin 6 FIGURE 9 Dual supply internal crystal clock oscillator Internal frequency divider enabled Output of ...

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Applications Information SINGLE-SUPPLY CLOCK OPTIONS FIGURE 10 Single 5V supply external TTL-level clock Internal frequency divider disabled a FIGURE 11 Single Internal frequency divider enabled Output of logic divider available on pin 6 (Continued) 5V supply external CMOS-level ...

Page 18

Applications Information SINGLE-SUPPLY CLOCK OPTIONS FIGURE 12 Single 10V supply external TTL-level clock Internal frequency divider disabled a FIGURE 13 Single 10V supply external CMOS-level clock Internal frequency divider disabled a (Continued 10354 – 16 ...

Page 19

Applications Information SINGLE-SUPPLY CLOCK OPTIONS FIGURE 14 Single Internal frequency divider enabled Output of logic divider available on pin 6 FIGURE 15 Single 5V or 10V supply internal crystal clock oscillator Internal frequency divider enabled a a Output ...

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Typical Application 20 ...

Page 21

Physical Dimensions inches (millimeters) 14 Lead Ceramic Dual-In-Line Package (J) Order Number LMF90CIJ LMF90CMJ LMF90CMJ 883 or LMF90CCJ 14 Lead Molded Package Small Outline 0 300 Wide Order Number LMF90CCWM or LMF90CIWM NS Package Number J14A NS Package Number M14B ...

Page 22

... Physical Dimensions inches (millimeters) (Continued) 14 Lead Molded Dual-In-Line Package (N) Order Number LMF90CCN or LMF90CIN LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMICONDUCTOR CORPORATION As used herein ...

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