MF10ACWM National Semiconductor, MF10ACWM Datasheet

MF10ACWM

Manufacturer Part Number
MF10ACWM
Description
Manufacturer
National Semiconductor
Datasheet

Specifications of MF10ACWM

Architecture
Switched Capacitor
Filter Type
Universal
Cutoff Frequency
30KHz
Dual Supply Voltage (typ)
±5V
Power Supply Requirement
Single/Dual
Operating Temperature (min)
0C
Operating Temperature (max)
70C
Operating Temperature Classification
Commercial
Package Type
SOIC W
Lead Free Status / Rohs Status
Not Compliant
© 2001 National Semiconductor Corporation
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
resistors, can produce various 2nd order functions. Each
building block has 3 output pins. One of the outputs can be
configured to perform either an allpass, highpass or a notch
function; the remaining 2 output pins perform lowpass and
bandpass functions. The center frequency of the lowpass
and bandpass 2nd order functions can be either directly
dependent on the clock frequency, or they can depend on
both clock frequency and external resistor ratios. The center
frequency of the notch and allpass functions is directly de-
pendent on the clock frequency, while the highpass center
frequency 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.
System Block Diagram
Package in 20 pin molded wide body surface mount and 20 pin molded DIP.
DS010399
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
n Easy to use
n Clock to center frequency ratio accuracy
n Filter cutoff frequency stability directly dependent on
n Low sensitivity to external component variation
n Separate highpass (or notch or allpass), bandpass,
n f
n Operation up to 30 kHz
n 20-pin 0.3" wide Dual-In-Line package
n 20-pin Surface Mount (SO) wide-body package
external clock quality
lowpass outputs
O
x Q range up to 200 kHz
01039901
±
0.6%
www.national.com
May 2001

Related parts for MF10ACWM

MF10ACWM Summary of contents

Page 1

... MF10 packages. System Block Diagram Package in 20 pin molded wide body surface mount and 20 pin molded DIP. © 2001 National Semiconductor Corporation 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 ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. + − Supply Voltage (V − Voltage at Any Pin Input Current at Any Pin (Note 2) Package Input Current (Note 2) Power Dissipation (Note 3) Storage Temperature ...

Page 3

Electrical Characteristics + − +5.00V and V = −5.00V unless otherwise specified. Boldface limits apply for T 25˚C. Symbol Parameter (Note Offset Voltage OS3 (Note Offset Voltage OS2 (Note ...

Page 4

... MF10ACN/CCN when board mounted is 55˚C/W. For the MF10AJ/CCJ, this number JMAX increases to 95˚C/W and for the MF10ACWM/CCWM this number is 66˚C/W. Note 4: The accuracy of the Q value is a function of the center frequency (f Characteristics” ...

Page 5

Typical Performance Characteristics Power Supply Current vs. Power Supply Voltage Negative Output Voltage Swing vs. Load Resistance (N/AP/HP Output) Positive Output Swing vs. Temperature Positive Output Voltage Swing vs. Load Resistance (N/AP/HP Output) 01039934 Negative Output Swing vs. Temperature 01039936 ...

Page 6

Typical Performance Characteristics Q Deviation vs. Temperature Q Deviation vs. Clock Frequency f /f Deviation vs. Temperature CLK O www.national.com (Continued) Q Deviation vs. Temperature 01039940 Q Deviation vs. Clock Frequency 01039942 f /f Deviation vs. Temperature CLK O 01039944 ...

Page 7

Typical Performance Characteristics f /f Deviation vs. Clock Frequency CLK O Deviation vs. Nominal Q CLK O (Continued Deviation vs. Clock Frequency CLK O 01039946 Deviation of f 01039948 7 01039947 /f vs. Nominal Q ...

Page 8

Pin Descriptions LP(1,20), BP(2,19), N/AP/HP(3,18) The second order lowpass, bandpass and notch/allpass/highpass outputs. These outputs can typically sink 1.5 mA and source 3 mA. Each output typically swings to within 1V of each supply. INV(4,17) The inverting input of the ...

Page 9

Definition of Terms H : the gain (in V/V) of the lowpass output as f OLP ( Figure the gain (in V/V) of the highpass output as f OHP ( Figure ...

Page 10

Definition of Terms www.national.com (Continued) 01039907 (a) 01039908 (b) 01039957 FIGURE 2. 2nd-Order Low-Pass Response 10 ...

Page 11

Definition of Terms (Continued) 01039909 (a) 01039910 (b) FIGURE 3. 2nd-Order High-Pass Response 11 01039958 www.national.com ...

Page 12

Definition of Terms www.national.com (Continued) 01039911 (a) 01039912 (b) 01039960 FIGURE 4. 2nd-Order Notch Response 12 ...

Page 13

Definition of Terms (Continued) 01039913 (a) 01039914 (b) 01039961 FIGURE 5. 2nd-Order All-Pass Response 13 www.national.com ...

Page 14

Definition of Terms (a) Bandpass 01039950 (d) Notch FIGURE 6. Response of various 2nd-order filters as a function of Q. Gains and center frequencies are normalized to unity. 2.0 Modes of Operation The MF10 is a switched capacitor (sampled ...

Page 15

Modes of Operation MODE 2: Notch 2, Bandpass, Lowpass: f (See Figure 9 ) (Continued) FIGURE 7. MODE 1 FIGURE 8. MODE 1a < f MODE 3: Highpass, Bandpass, Lowpass Outputs notch O (See Figure 01039916 ...

Page 16

Modes of Operation * In Mode 3, the feedback loop is closed around the input summing amplifier; the finite GBW product of this op amp causes a slight Q enhancement. If this is a problem, connect a small capacitor ...

Page 17

Modes of Operation MODE 3a: HP, BP, LP and Notch with External Op Amp (See Figure 11 ) MODE 4: Allpass, Bandpass, Lowpass Outputs(See (Continued) Figure Due to the sampled data nature of the filter, a ...

Page 18

Modes of Operation MODE 5: Numerator Complex Zeros, BP, LP (See Figure 13 ) www.national.com (Continued) FIGURE 12. MODE 4 MODE 6a: Single Pole, HP, LP Filter (See Figure 14 ) MODE 6b: Single Pole LP Filter (Inverting and ...

Page 19

Modes of Operation TABLE 1. Summary of Modes. Realizable filter types (e.g. low-pass) denoted by asterisks. Unless otherwise noted, gains of various filter outputs are inverting and adjustable by resistor ratios. Mode (2) 1a ...

Page 20

Applications Information The MF10 is a general-purpose dual second-order state variable filter whose center frequency is proportional to the frequency of the square wave applied to the clock input ( connecting pin 12 to the appropriate DC ...

Page 21

Applications Information FIGURE 16. Fourth-Order Chebyshev Low-Pass Filter from Example in 3.1. ± 5V Power Supply. 0V–5V TTL or −5V FIGURE 17. Fourth-Order Chebyshev Low-Pass Filter from Example in 3.1. Single +10V Power Supply. 0V–5V TTL Logic Levels. Input ...

Page 22

Applications Information FIGURE 18. Three Ways of Generating V www.national.com (Continued) 01039927 (a) Resistive Divider with Decoupling Capacitor 01039928 (b) Voltage Regulator 01039929 (c) Operational Amplifier with Divider + /2 for Single-Supply Operation 22 ...

Page 23

Applications Information (Continued) 3.2 SINGLE SUPPLY OPERATION The MF10 can also operate with a single-ended power sup- ply. Figure 17 shows the example filter with a single-ended + + power supply. V and V are again connected to the ...

Page 24

Applications Information (Continued) For most applications, the outputs are AC coupled and DC offsets are not bothersome unless large signals are applied www.national.com FIGURE 19. MF10 Offset Voltage Sources 01039931 FIGURE 20. Method for Trimming V to the filter ...

Page 25

Applications Information (Continued) any of the outputs will cause gain nonlinearities and will change f and Q. When operating in Mode 3, offsets can O become excessively large if R2 and R4 are used to make f /f significantly ...

Page 26

Applications Information Connection Diagram www.national.com (Continued) Surface Mount and Dual-In-Line Package 01039904 Top View Order Number MF10CCWM See NS Package Number M20B Order Number MF10ACN or MF10CCN See NS Package Number N20A 26 ...

Page 27

... Physical Dimensions inches (millimeters) unless otherwise noted Molded Package (Small Outline) (M) Order Number MF10ACWM or MF10CCWM NS Package Number M20B 20-Lead Molded Dual-In-Line Package (N) Order Number MF10ACN or MF10CCN NS Package Number N20A 27 www.national.com ...

Page 28

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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