UA
F
42
SBFS002B – JULY 1992 – REVISED OCTOBER 2010
UA
F
42
www.ti.com
UNIVERSAL ACTIVE FILTER
Check for Samples:
1
FEATURES
•
VERSATILE:
– Low-Pass, High-Pass
– Band-Pass, Band-Reject
SIMPLE DESIGN PROCEDURE
ACCURATE FREQUENCY AND Q:
– Includes On-Chip 1000pF ±0.5% Capacitors
DESCRIPTION
The UAF42 is a universal active filter that can be
configured for a wide range of low-pass, high-pass,
and band-pass filters. It uses a classic state-variable
analog architecture with an inverting amplifier and two
integrators. The integrators include on-chip 1000pF
capacitors trimmed to 0.5%. This architecture solves
one of the most difficult problems of active filter
design—obtaining tight tolerance, low-loss capacitors.
A DOS-compatible filter design program allows easy
implementation of many filter types, such as
Butterworth, Bessel, and Chebyshev. A fourth,
uncommitted FET-input op amp (identical to the other
three) can be used to form additional stages, or for
special filters such as band-reject and Inverse
Chebyshev.
The classical topology of the UAF42 forms a
time-continuous filter, free from the anomalies and
switching noise associated with switched-capacitor
filter types.
The UAF42 is available in 14-pin plastic DIP and
SOIC-16 surface-mount packages, specified for the
–25°C to +85°C temperature range.
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High-Pass
Out
R
R
In
1
1000pF
(1)
2
•
•
APPLICATIONS
•
•
•
•
•
TEST EQUIPMENT
COMMUNICATIONS EQUIPMENT
MEDICAL INSTRUMENTATION
DATA ACQUISITION SYSTEMS
MONOLITHIC REPLACEMENT FOR UAF41
Band-Pass
Out
Low-Pass
Out
1000pF
(1)
V+
In
2
R
In
3
R = 50kW
±
0.5%
GND
R
V-
NOTE: (1) ±0.5%.
1
2
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
Copyright © 1992–2010, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
TI [ TEXAS INSTRUMENTS ]
