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Part: MF6
Category:
Analog & Mixed-Signal Processing
-> Filters
-> Low Pass Filters
Description: 6th Order Switched Capacitor Butterworth Lowpass Filter (obsolete)
Company: National Semiconductor Corporation
Datasheet: Download MF6 datasheet File size : 700 kB
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Datasheet text preview:
MF6 6th Order Switched Capacitor Butterworth Lowpass Filter
June 1999
MF6 6th Order Switched Capacitor Butterworth Lowpass Filter
General Description
The MF6 is a versatile easy to use, precision 6th order Butterworth lowpass active filter. Switched capacitor techniques eliminate external component requirements and allow a clock tunable cutoff frequency. The ratio of the clock frequency to the lowpass cutoff frequency is internally set to 50 to 1 (MF6-50) or 100 to 1 (MF6-100). A Schmitt trigger clock input stage allows two clocking options, either self-clocking (via an external resistor and capacitor) for stand-alone applications, or an external TTL or CMOS logic compatible clock can be used for tighter cutoff frequency control. The maximally flat passband frequency response together with a DC gain of 1 V/V allows cascading MF6 sections for higher order filtering. In addition to the filter, two independent CMOS op amps are included on the die and are useful for any general signal conditioning applications.
Features
n n n n n n No external components Cutoff frequency accuracy of ± 0.3% typical Cutoff frequency range of 0.1 Hz to 20 kHz Two uncommitted op amps available 5V to 14V total supply voltage Cutoff frequency set by external or internal clock
Block and Connection Diagrams
All Packages
DS005065-2
Top View Order Number MF6CWM-50 or MF6CWM-100 See NS Package Number M14B
DS005065-1
TRI-STATE ® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation
DS005065
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Absolute Maximum Ratings (Note 11)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Voltage at Any Pin Input Current at Any Pin (Note 13) Package Input Current (Note 13) Power Dissipation (Note 14) Storage Temperature ESD Susceptibility (Note 12) 14V V- - 0.2V, V+ + 0.2V 5 mA 20 mA 500 mW -65°C to +150°C 800V
Soldering Information Vapor Phase (60 sec.) 215°C Infrared (15 sec.) 220°C See AN-450 "Surface Mounting Methods and Their Effect on Product Reliability" (Appendix D) for other methods of soldering surface mount devices.
Operating Ratings (Note 11)
Temperature Range MF6CWM-50, MF6CWM-100 Supply Voltage (VS = V+-V-) TMIN TA TMAX 0°C TA +70°C 5V to 14V
Filter Electrical Characteristics
The following specifications apply for fCLK 250 kHz (Note 3) unless otherwise specified. Boldface limits apply for TMIN to TMAX; all other limits TA = TJ = 25°C.
Parameter Conditions Typical (Note 8) V+ = +5V, V- = -5V fc, Cutoff Frequency Range (Note 1) Total Supply Current Maximum Clock Feedthrough Filter Output Op Amp 1 Out Op Amp 2 Out Ho, DC Gain fCLK/fc Clock to Cutoff Frequency Ratio DC Offset Voltage Minimum Output Voltage Swing Maximum Output Short Circuit Current (Note 6) Dynamic Range (Note 2) Additional Magnitude Response Test Points (Note 4) MF6-100 MF6-50 MF6-100 MF6-50 fCLK = 250 kHz f = 6000 Hz f = 4500 Hz fCLK = 250 kHz f = 3000 Hz f = 2250 Hz Attenuation Rate MF6-50 f1 = 6000 Hz f2 = 8000 Hz MF6-100 fCLK = 250 kHz f1 = 3000 Hz f2 = 4000 Hz V+ = +2.5V, V- = -2.5V fc, Cutoff Frequency Range (Note 1) MF6-100 MF6-50 Min Max Min Max 0.1 10k 0.1 5k Hz -36 -36 dB/ octave fCLK = 250 kHz -36 -36 octave -9.48 -0.97 -9.48 ± 0.3 -0.97 ± 0.3 -9.48 ± 0.75 -0.97 ± 0.4 dB/ dB -9.47 -0.92 -9.47 ± 0.6 -0.92 ± 0.6 -9.47 ± 0.75 -0.92 ± 0.4 dB 83 81 dB Source Sink MF6-50 MF6-100 RL = 10 k -200 -400 +4.0 -4.1 50 1.5 mA +3.5 -3.8 +3.5 -3.5 V mV MF6-50 MF6-100 Rsource 2 k 49.27 ± 0.3% 98.97 ± 0.3% 49.27 ± 1% 98.97 ± 1% 49.27 ± 1% 98.97 ± 1% MF6-100 MF6-50 Min Max Min Max fCLK = 250 kHz 4.0 30 25 20 0.0 6.0 0.1 20k 0.1 10k 8.5 mA mV (peak-topeak) Hz Tested Limit (Note 9) Design Limit (Note 10) Units
± 0.30
± 0.30
dB
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2
Filter Electrical Characteristics
Parameter
(Continued)
The following specifications apply for fCLK 250 kHz (Note 3) unless otherwise specified. Boldface limits apply for TMIN to TMAX; all other limits TA = TJ = 25°C.
Conditions Typical (Note 8) V+ = +2.5V, V- = -2.5V Total Supply Current Maximum Clock Feedthrough Filter Output Op Amp 1 Out Op Amp 2 Out Ho, DC Gain fCLK/fc, Clock to Cutoff Frequency Ratio DC Offset Voltage Minimum Output Voltage Swing Maximum Output Short Circuit Current (Note 6) Dynamic Range (Note 2) Additional Magnitude Response Test Points (Note 4) MF6-100 MF6-50 fCLK = 250 kHz f = 6000 Hz f = 4500 Hz fCLK = 250 kHz f = 3000 Hz f = 2250 Hz Attenuation Rate MF6-50 fCLK = 250 kHz f1 = 6000 Hz f2 = 8000 Hz MF6-100 fCLK = 250 kHz f1 = 3000 Hz f2 = 4000 Hz -36 -36 dB/ octave -36 -36 -9.67 -1.01 -9.67 ± 0.6 -1.01 ± 0.3 -9.67 ± 0.75 -1.01 ± 0.4 dB/ octave dB -9.54 -0.96 -9.54 ± 0.6 -0.96 ± 0.3 -9.54 ± 0.75 -0.96 ± 0.4 dB 77 dB Source Sink MF6-50 MF6-100 MF6-50 MF6-100 RL = 10 k 49.10 ± 0.3% 98.65 ± 0.3% -200 -400 +1.5 -2.2 28 0.5 mA +1.0 -1.7 +1.0 -1.5 V 49.10 ± 2% 98.65 ± 2% 49.10 ± 3% 98.65 ± 2.25% mV Rsource2 k fCLK = 250 kHz 2.5 20 15 10 0.0 4.0 4.0 mA mV (peak-topeak) Tested Limit (Note 9) Design Limit (Note 10) Units
± 0.30
± 0.30
dB
Op Amp Electrical Characteristics
Boldface limits apply for TMIN to TMAX; all other limits TA = TJ = 25°C.
Parameter Conditions Typical (Note 8) V+ = +5V, V- = -5V Input Offset Voltage Input Bias Current CMRR (Op Amp #2 Only) Output Voltage Swing Maximum Output Short Circuit Current (Note 6) Slew Rate DC Open Loop Gain Gain Bandwidth Product V+ = +2.5V, V- = -2.5V Input Offset Voltage Source Sink VCM1 = 1.8V, VCM2 = -2.2V RL = 10 k +4.0 -4.5 54 2.0 7.0 72 1.2 +3.8 -4.0 65 4.0 +3.6 -4.0 80 6.0 mA V/µs dB MHz V Tested Limit (Note 9) Design Limit (Note 10) Units
± 8.0
10 60
± 20
55
± 20
mV pA dB
± 8.0
± 20
± 20
mV
3
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