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LMF100
High Performance Dual Switched Capacitor Filter
TL/H/5645
LMF100
High
Performance
Dual
Switched
Capacitor
Filter
January 1995
LMF100 High Performance Dual Switched Capacitor Filter
General Description
The LMF100 consistsoftwo independent general purpose
high performance switched capacitor filters. Withan exter-
nal clock and2to4 resistors, various second-order and
first-order filtering functions canbe realizedby each filter
block. Each blockhas3 outputs. One outputcanbe config-
uredto perform eitheran allpass, highpass,or notch func-
tion. The othertwo outputs perform bandpassand lowpass
functions.The center frequencyof each filter stageis tuned usingan external clockora combinationofa clockand
resistor ratio.Uptoa 4th-order biquadratic functioncanbe
realized witha single LMF100.Higher order filters areimple-
mentedby simply cascading additional packages, andall
the classical filters (suchas Butterworth, Bessel, Elliptic,
and Chebyshev)canbe realized.
The LMF100is fabricatedon National Semiconductor’s
high performance analog silicon gate CMOS process,
LMCMOSTM. This allowsforthe productionofa verylow
offset, high frequency filter building block. The LMF100is
pin-compatible withthe industry standard MF10,but pro-
vides greatly improved performance.
Features Wide4Vto15V power supply range Operationupto100kHz Low offset voltage typically
(50:1or 100:1 mode) Vos1e g5mV
Vos2e g15mV
Vos3e g15mV Low crosstalk b60dB Clockto center frequency ratio accuracy g0.2% typicalf0cQ rangeupto1.8 MHz Pin-compatible with MF10
4th Order 100 kHz Butterworth Lowpass Filter
TL/H/5645–2
TL/H/5645–3
Connection Diagram
Surface Mountand Dual-In-Line Package
TL/H/5645–18
Top View
Order Number LMF100AE/883or5962-9153301M2A,
LMF100AJ,LMF100AJ/883or 5962-9153301MRA,
LMF100CIJ,LMF100ACN, LMF100CCN, LMF100CINor
LMF100CIWM
SeeNS Package NumberJ20A, N20Aor M20B
LMCMOSTMisa trademarkof National Semiconductor Corporation.
C1995National SemiconductorCorporation RRD-B30M115/PrintedinU.S.A.
