MAX260ACNG+

Overview

The MAX260ACNG+ is a CMOS dual second-order universal switched-capacitor active filter in a 24-pin Plastic DIP package. It provides microprocessor control over precise filter functions, including bandpass, lowpass, highpass, notch, and allpass configurations. The device operates on single +5V or ±5V supplies with a typical power supply current of 15mA at ±5V. It features two independent filter sections with separate clock inputs (CLKA, CLKB) and supports center frequency programming via a 6-bit f0 input and Q programming via an 8-bit input. The AC grade guarantees a clock-to-f0 ratio accuracy of 1%.

Feature Summary

• Microprocessor interface for independent control of center frequency and Q factor
• Dual second-order sections supporting multiple filter topologies without external components
• Auto-zero circuitry for superior DC offset and drift performance
• Flexible clocking options using crystals, RC networks, or external generators

Applications

• µP-tuned filters
• Anti-aliasing filters
• Digital signal processing
• Adaptive filters
• Signal analysis

Procurement Notes

Verify the component authenticity by checking the marking code against the official datasheet specifications. Confirm the package type is 24-pin Plastic DIP and the temperature range matches the commercial grade requirements. Ensure the ordering suffix corresponds to the specific accuracy grade needed for the application design.

Selection Notes

Select the MAX260ACNG+ when high DC accuracy and low offset voltage are critical, as it includes auto-zero circuitry not found in the MAX261 or MAX262 variants. This model is suitable for applications requiring a center frequency range up to 7.5kHz. Verify that the system clock capabilities align with the device's maximum clock frequency limits for the desired filter modes.

Part Context

The MAX260ACNG+ belongs to the MAX260/MAX261/MAX262 family of microprocessor-programmable universal active filters. While sharing the same interface and basic architecture, the MAX260 is distinguished by its auto-zero technology, which minimizes DC errors compared to the MAX261 and MAX262. This makes it the preferred choice for precision low-frequency filtering applications within the series.

Replacement Considerations

Direct functional replacements within the same package include the MAX260BCNG+, which offers 2% accuracy instead of 1%. For extended temperature ranges, the MAX260AENG (-40°C to +85°C) is available. SMD equivalents such as the MAX260ACWG exist but require different footprint considerations.