MF10 Universal Monolithic Dual Switched Capacitor Filter
December 1994
MF10
Universal Monolithic Dual
Switched Capacitor Filter
General Description
The MF10 consists of 2 independent and extremely easy to
use general purpose CMOS active filter building blocks
Each block together with an external clock and 3 to 4 resis-
tors can produce various 2nd order functions Each building
block has 3 output pins One of the outputs can be config-
ured to perform either an allpass highpass or a notch func-
tion the remaining 2 output pins perform lowpass and band-
pass functions The center frequency of the lowpass and
bandpass 2nd order functions can be either directly depen-
dent on the clock frequency or they can depend on both
clock frequency and external resistor ratios The center fre-
quency of the notch and allpass functions is directly depen-
dent on the clock frequency while the highpass center fre-
quency depends on both resistor ratio and clock Up to 4th
order functions can be performed by cascading the two 2nd
order building blocks of the MF10 higher than 4th order
functions can be obtained by cascading MF10 packages
Any of the classical filter configurations (such as Butter-
worth Bessel Cauer and Chebyshev) can be formed
For pin-compatible device with improved performance refer
to LMF100 datasheet
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Easy to use
Clock to center frequency ratio accuracy
g
0 6%
Filter cutoff frequency stability directly dependent on
external clock quality
Low sensitivity to external component variation
Separate highpass (or notch or allpass) bandpass low-
pass outputs
f
O
c
Q range up to 200 kHz
Operation up to 30 kHz
20-pin 0 3 wide Dual-In-Line package
20-pin Surface Mount (SO) wide-body package
System Block Diagram
Connection Diagram
Surface Mount and Dual-In-Line
Package
TL H 10399 – 4
Top View
Order Number MF10AJ or MF10CCJ
See NS Package Number J20A
Order Number MF10ACWM or
MF10CCWM
See NS Package Number M20B
Order Number MF10ACN or
MF10CCN
See NS Package Number N20A
TL H 10399 – 1
C
1995 National Semiconductor Corporation
TL H 10399
RRD-B30M115 Printed in U S A
NSC [ NATIONAL SEMICONDUCTOR ]
