MAX268BCWG+

Overview

The MAX268BCWG+ is a pin-programmable universal and bandpass active filter manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 4.74V to 12.6V, or ±2.37V to ±6.3V. The device features two second-order filter sections housed in a 24-SOIC package with a width of 0.295 inches (7.50mm). It supports a center frequency or cutoff frequency of 140kHz. The component is designed for surface-mount installation and functions reliably across an operating temperature range from 0°C to +70°C.

Feature Summary

• Pin-programmable configuration allows selection of various filter functions including bandpass, lowpass, highpass, notch, and allpass without external components.
• Dual second-order filter sections enable independent control of center frequency, Q factor, and operating mode via digital inputs.
• Integrated clock generation support accepts crystal, RC network, or external clock signals to set filter parameters.

Applications

• Signal processing circuits requiring precise frequency selection
• Telecommunications equipment utilizing switched-capacitor filtering
• Instrumentation systems needing programmable bandwidth adjustment

Procurement Notes

Verify the specific suffix 'CWG+' against the manufacturer's current datasheet to confirm package type and temperature grade. Confirm RoHS compliance status as indicated in the latest documentation. Check for end-of-life notifications or discontinuance alerts prior to finalizing procurement plans.

Selection Notes

Select this component when dual second-order switched-capacitor filtering is required with digital programmability. Ensure the application environment stays within the specified 0°C to +70°C temperature range. Verify that the available clock input matches the desired center frequency of 140kHz.

Part Context

This part belongs to the MAX263/MAX264/MAX267/MAX268 family of pin-programmable universal and bandwidth filters. These devices share common architectural features such as CMOS technology and switched-capacitor operation, differing primarily in performance specifications like maximum center frequency and package options.

Replacement Considerations

Consider the MAX268ACWG+ for similar functionality with potentially different commercial/industrial temperature ratings. Verify pin compatibility and electrical specifications against the original design requirements before substitution.

FAQ

What determines the center frequency of the MAX268BCWG+?

The center frequency is determined by the input clock signal and the 6-bit f0 program input, allowing precise tuning without affecting other filter parameters.

Can the MAX268BCWG+ operate without external passive components?

Yes, the device is a switched-capacitor filter that does not require external capacitors or resistors for configuring bandpass, lowpass, highpass, notch, or allpass functions.

How is the filter Q controlled in this device?

The filter Q is programmed independently through the device's pin-programmable interface, separate from the frequency setting controls.