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LMF100

SNOSBG9B – JULY 1999 – REVISED JUNE 2015

LMF100 Dual High-Performance Switched Capacitor Filters

Not Recommended for New Designs

1 Features

3 Description

The LMF100 device consists of two independent

1

•

Wide 4-V to 15-V Power Supply Range

general-purpose,

high-performance

switched

•

Operation up to 100 kHz

capacitor filters. With an external clock and two to

•

Low Offset Voltage:

four resistors, each filter block can realize various

second-order and first-order filtering functions. Each

–

Typically (50:1 or 100:1 mode):

block

has

three

outputs.

One

output

can

be

–

Vos1 = ±5 mV

configured to perform either an allpass, highpass, or

–

Vos2 = ±15 mV

notch function. The other two outputs perform

bandpass

and

lowpass

functions.

The

center

–

Vos3 = ±15 mV

frequency of each filter stage is tuned by using an

•

Low Crosstalk: –60 dB

external clock or a combination of a clock and resistor

•

Clock to Center Frequency Ratio Accuracy ±0.2%

ratio. Up to a fourth-order biquadratic function can be

(Typical)

realized with one LMF100. Higher order filters are

implemented

by

simply

cascading

additional

•

packages, and all the classical filters (such as

•

Pin-Compatible With MF10

Butterworth, Bessel, Elliptic, and Chebyshev) can be

realized.

2 Applications

The LMF100 is fabricated on TI’s high-performance

•

Replacing Active RC Filters With Reduced Form

analog silicon gate CMOS process, LMCMOS™. This

Factors and Higher Accuracy and Tunability

allows for the production of a very low-offset, high-

•

An Alternative to Integrated Continuous Time

frequency filter building block. The LMF100 is pin-

Filters

compatible with the industry standard MF10, but

provides greatly improved performance.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SOIC (20)

12.60 mm × 10.00 mm

LMF100

PDIP (20)

24.33 mm × 6.35 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Fourth-Order 100-kHz Butterworth Lowpass Filter

Transfer Curve of Butterworth LP Filter Roll-Off

Magnitude vs Frequency

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.