Product Summary

The MF8CCN 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 second-order bandpass filters, or cascaded to form a single fourth-order bandpass filter. The center frequency of MF8CCN is controlled by an external clock for optimal accuracy, and may be set anywhere between 0.1 Hz and 20 kHz. The ratio of clock frequency to center frequency is programmable to 100:1 or 50:1. Two inputs are available for TTL or CMOS clock signals. The TTL input will accept logic levels referenced 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 selfoscillate using an external resistor and capacitor.

Parametrics

MF8CCN absolute maximum ratings: (1)Supply Voltage (VS = V+ - V-): -0.3V to 15V; (2)Voltage at any Input: V- -0.3V to V+ +0.3V; (3)Input Current at any Input Pin: ±1 mA; (4)Output Short-Circuit Current: ±1 mA; (5)Power Dissipation: 500 mW; (6)Storage Temperature: -65℃ to 150℃; (7)Soldering Information: J Package: 10 sec. 260℃; N Package: 10 sec. 300℃; (8)SO Package: Vapor Phase (60 sec.) 215℃; Infrared (15 sec.) 220℃.

Features

MF8CCN features: (1)Center frequency set by external clock; (2)Q set by five-bit digital word; (3)Uncommitted inverting op amp; (4)4th-order all-pole filters using only three external resistors; (5)Cascadable for higher-order filters; (6)Bandwidth, response characteristic, and center frequency independently programmable; (7)Separate TTL and CMOS clock inputs; (8)18 pin 0.3* wide package.

Diagrams

MF8CCN Typical Application