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MF8CCJ Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MF8CCJ Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 24 page  TLH8694 January 1995 MF8 4th-Order Switched Capacitor Bandpass Filter General Description The MF8 consists of two second-order bandpass filter stages and an inverting operational amplifier The two filter stages are identical and may be used as two tracking sec- ond-order bandpass filters or cascaded to form a single fourth-order bandpass filter The center frequency is con- trolled by an external clock for optimal accuracy and may be set anywhere between 01 Hz and 20 kHz The ratio of clock frequency to center frequency is programmable to 1001 or 501 Two inputs are available for TTL or CMOS clock signals The TTL input will accept logic levels refer- enced to either the negative power supply pin or the ground pin allowing operation on single or split power supplies The CMOS input is a Schmitt inverter which can be made to self- oscillate using an external resistor and capacitor By using the uncommitted amplifier and resistors for nega- tive feedback any all-pole (Butterworth Chebyshev etc) filter can be formed This requires only three resistors for a fourth-order bandpass filter Q of the second-order stages may be programmed to any of 31 different values by the five ‘‘Q logic’’ pins The available Q values span a range from 05 through 90 Overall filter bandwidth is programmed by connecting the appropriate Q logic pins to either Va or Vb Filters with order higher than four can be built by cascading MF8s Features Y Center frequency set by external clock Y Q set by five-bit digital word Y Uncommitted inverting op amp Y 4th-order all-pole filters using only three external resistors Y Cascadable for higher-order filters Y Bandwidth response characteristic and center frequency independently programmable Y Separate TTL and CMOS clock inputs Y 18 pin 03 wide package Key Specifications Y Center frequency range 01 Hz to 20 kHz Y Q range 05 to 90 Y Supply voltage range 9V to 14V (g45V to g7V) Y Center frequency accuracy 1% over full temperature range Typical Application Connection Diagrams TLH8694 – 1 Fourth-Order Butterworth Bandpass Filter Dual-In-Line Package TLH8694 – 2 Top View Order Number MF8CCJ or MF8CCN See NS Package Number J18A or N18A C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
Similar Part No. - MF8CCJ |
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Similar Description - MF8CCJ |
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