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LMF100 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMF100
Description  High Performance Dual Switched Capacitor Filter
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMF100 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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High Performance Dual Switched Capacitor Filter
General Description
The LMF100 consists of two independent general purpose
high performance switched capacitor filters. With an external
clock and 2 to 4 resistors, various second-order and
first-order filtering functions can be realized by each filter
block. Each block has 3 outputs. One output can be config-
ured to perform either an allpass, highpass, or notch func-
tion. The other two outputs perform bandpass and lowpass
functions. The center frequency of each filter stage is tuned
by using an external clock or a combination of a clock and re-
sistor ratio. Up to a 4th-order biquadratic function can be re-
alized with a single LMF100. Higher order filters are imple-
mented by simply cascading additional packages, and all the
classical filters (such as Butterworth, Bessel, Elliptic, and
Chebyshev) can be realized.
The LMF100 is fabricated on National Semiconductor’s high
LMCMOS. This allows for the production of a very low off-
set, high frequency filter building block. The LMF100 is
pin-compatible with the industry standard MF10, but pro-
vides greatly improved performance.
n Wide 4V to 15V power supply range
n Operation up to 100 kHz
n Low offset voltage:
(50:1 or 100:1 mode):
Vos1 = ±5mV
Vos2 = ±15 mV
Vos3 = ±15 mV
n Low crosstalk −60 dB
n Clock to center frequency ratio accuracy ±0.2% typical
n f0 x Q range up to 1.8 MHz
n Pin-compatible with MF10
4th Order 100 kHz Butterworth Lowpass Filter
Connection Diagram
LMCMOSis a trademark of National Semiconductor Corporation.
Surface Mount and Dual-In-Line Package
Top View
Order Number
See NS Package Number N20A or M20B
July 1999
© 1999 National Semiconductor Corporation

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