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LMF90CCN-LMF90CCWM
4th-Order Elliptic Notch Filter
TL/H/10354
LMF90
4th-Order
Elliptic
Notch
Filter
December 1994
LMF90
4th-Order Elliptic Notch Filter
General Description
The LMF90isa fourth-order elliptic notch (band-reject) filter
basedon switched-capacitor techniques.No external com-
ponentsare neededto definethe response function. The
depthofthe notchisset usinga two-level logic input,and
the widthis programmedusing athree-level logicinput. Two
different notch depths and three different ratiosof notch
widthto center frequency maybe programmedby connect-
ing these pinstoVa, ground,orVb. Another three-level
logicpin setsthe ratioof clock frequencyto notch frequen-
cy. internalcrystaloscillatoris provided.Usedin conjunction
witha low-cost colorTV crystalandthe internal clockfre-
quency divider,a notch filter canbe built with centerfre-
quencyat50Hz,60Hz,100Hz,120Hz,150Hz,or180Hz
forrejectionof power lineinterference.Several LMF90scan operated froma single crystal.An additional inputispro-
videdforan externally-generated clock signal.
Features Center frequencysetby external clockor on-board
clock oscillatorNo external components neededtoset response char-
acteristics Notch width, attenuation, and clock-to-center-frequency
ratio independently programmable14pin 0.3× wide package
Key Specificationsf0 Range 0.1Hzto30 kHzf0 accuracy overfull temperature range (max) 1.5% Supply voltage range g2Vto g7.5Vor4Vto 15V Passband Ripple (typ) 0.25dB Attenuationatf0 (typ) 39dBor48dB (selectable) fCLK:f0 100:1, 50:1,or 33.3:1 Notch Bandwidth (typ) 0.127f0, 0.26f0,or 0.55f0 Output offset voltage (max) 120mV
Applications Automatictest equipment Communications Powerline interference rejection
Typical ConnectionHz Notch Filter
TL/H/10354–1
Connection
Diagram
Dual-In-Lineand Small
Outline Packages
TL/H/10354–2
Top View
Order Number LMF90CCN,
LMF90CIWM,
LMF90CCWM,LMF90CIJ,
LMF90CCJ, LMF90CIN,
LMF90CMJor
LMF90CMJ/883
See NSPackage Number
J14A,M14Bor N14A
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
