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參數資料
| 型號： | LMF90CIWM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬濾波器 |
| 英文描述： | 4th-Order Elliptic Notch Filter |
| 中文描述： | SWITCHED CAPACITOR FILTER, ELLIPTIC, NOTCH, PDSO14 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-14 |
| 文件頁數： | 1/22頁 |
| 文件大小： | 411K |
| 代理商： | LMF90CIWM |
TL/H/10354
L
December 1994
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
, ground, or V
. Another three-level
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
Center frequency set by external clock or on-board
clock oscillator
Y
No external components needed to set response char-
acteristics
Y
Notch width, attenuation, and clock-to-center-frequency
ratio independently programmable
Y
14 pin 0.3
×
wide package
Key Specifications
Y
f
0
Range
Y
f
0
accuracy over full temperature range (max)
Y
Supply voltage range
0.1 Hz to 30 kHz
1.5%
g
2V to
g
7.5V or 4V to 15V
Y
Passband Ripple (typ)
0.25 dB
Y
Attenuation at f
0
(typ)
Y
f
CLK
: f
0
Y
Notch Bandwidth (typ)
39 dB or 48 dB (selectable)
100:1, 50:1, or 33.3:1
0.127 f
0
, 0.26 f
0
, or 0.55 f
0
Y
Output offset voltage (max)
120 mV
Applications
Y
Automatic test equipment
Y
Communications
Y
Power line interference rejection
Typical Connection
60 Hz Notch Filter
TL/H/10354–1
Connection
Diagram
Dual-In-Line and Small
Outline Packages
TL/H/10354–2
Top View
Order Number LMF90CCN,
LMF90CIWM,
LMF90CCWM, LMF90CIJ,
LMF90CCJ, LMF90CIN,
LMF90CMJ or
LMF90CMJ/883
See NS Package Number
J14A, M14B or N14A
C
1995 National Semiconductor Corporation
RRD-B30M115/Printed in U. S. A.
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