Burr Brown UAF42AU-1, UAF42AU, UAF42AP-1, UAF42AP Datasheet

©

1990 Burr-Brown Corporation PDS-1070H Printed in U.S.A. January, 1998

FEATURES

● VERSATILE—

LOW-PASS, HIGH-PASS
BAND-PASS, BAND-REJECT

● SIMPLE DESIGN PROCEDURE

● ACCURATE FREQUENCY AND Q —

INCLUDES ON CHIP 1000pF

±0.5%

CAPACITORS

APPLICATIONS

● TEST EQUIPMENT

● COMMUNICATIONS EQUIPMENT

● MEDICAL INSTRUMENTATION

● DATA ACQUISITION SYSTEMS

● MONOLITHIC REPLACEMENT FOR UAF41

UNIVERSAL ACTIVE FIL TER

DESCRIPTION

The UAF42 is a universal active filter which can be
configured for a wide range of low-pass, high-pass,
and band-pass filters. It uses a classical state-variable
analog architecture with an inverting amplifier and
two integrators. The integrators include on-chip 1000pF
capacitors trimmed to 0.5%. This 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 time­continuous filter, free from the anomalies and switch­ing noise associated with switched-capacitor filter
types.

The UAF42 is available in 14-pin plastic DIP and
SOL-16 surface-mount packages, specified for the –
25°C to +85°C temperature range.

UAF42

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High-Pass

Out

R

R

R

1000pF

(1)

In

2

In

3

In

1

R

1000pF

(1)

Band-Pass

Out

Low-Pass

Out

GND

V+

V–

NOTE: (1) ±0.5%

R = 50kΩ ±0.5%

UAF42

UAF42

UAF42

2

SPECIFICATIONS

ELECTRICAL

At TA = +25°C, VS = ±15V, unless otherwise noted.

UAF42AP, AU
PARAMETER CONDITIONS MIN TYP MAX UNITS
FILTER PERFORMANCE

Frequency Range, fn 0 to 100 kHz
Frequency Accuracy f = 1kHz 1 %
vs Temperature 0.01 %/°C
Maximum Q 400 —
Maximun (Q • Frequency) Product 500 kHz
Q vs Temperature (f

O

• Q) < 10

4

0.01 %/°C

(f

O

• Q) < 10

5

0.025 %/°C

Q Repeatability (f

O

• Q) < 10

5

2%
Offset Voltage, Low-Pass Output ±5mV
Resistor Accuracy 0.5 1% %

OFFSET VOLTAGE

(1)

Input Offset Voltage ±0.5 ±5mV
vs Temperature ±3 µV/°C
vs Power Supply V

S

= ±6 to ±18V 80 96 dB

INPUT BIAS CURRENT

(1)

Input Bias Current VCM = 0V 10 50 pA
Input Offset Current V

CM

= 0V 5 pA

NOISE

Input Voltage Noise

Noise Density: f = 10Hz 25 nV/√Hz

f = 10kHz 10 nV/√Hz

Voltage Noise: BW = 0.1 to 10Hz 2 µVp-p

Input Bias Current Noise

Noise Density: f = 10kHz 2 fA/√Hz

INPUT VOLTAGE RANGE

(1)

Common-Mode Input Range ±11.5 V
Common-Mode Rejection V

CM

= ±10V 80 96 dB

INPUT IMPEDANCE

(1)

Differential 1013 || 2 Ω || pF
Common-Mode 10

13

|| 6 Ω || pF

OPEN-LOOP GAIN

(1)

Open-Loop Voltage Gain VO = ±10V, RL = 2kΩ 90 126 dB

FREQUENCY RESPONSE

(1)

Slew Rate 10 V/µs
Gain-Bandwidth Product G = +1 4 MHz
Total Harmonic Distortion G = +1, f = 1kHz 0.0004 %

OUTPUT

(1)

Voltage Output RL = 2kΩ±11 ±11.5 V
Short Circuit Current ±25 mA

POWER SUPPLY

Specified Operating Voltage ±15 V
Operating Voltage Range ±6 ±18 V
Current ±6 ±7mA

TEMPERATURE RANGE

Specification –25 +85 °C
Operating –25 +85 °C
Storage –40 +125 °C
Thermal Resistance,

θ

JA

100 °C/W

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

✻ Same as specification for UAF42AP.
NOTES: (1) Specifications apply to uncommitted op amp, A

4

. The three op amps forming the filter are identical to A4 but are tested as a complete filter.