The MAX260/MAX261/MAX262 CMOS dual second-order universal switched-capacitor active filters allow microprocessor control of precise filter functions. No external components are required for various bandpass, lowpass, highpass, notch, and all pass configurations. Each device contains two second-order filter sections that place centre frequency, Q, and filter operating mode under programmed control. An input clock and a 6-bit f0 program input determine the filter's centre or corner frequency without affecting other filter parameters. The filter Q is also programmed independently. Separate clock inputs for each filter section operate with a crystal, RC network, or external clock generator.
The MAX260SOFT has offset and DC specifications superior to the MAX261 and MAX262 and a center frequency (f0) range of 7.5kHz. The MAX261 handles center frequencies to 57kHz, while the MAX262 extends the center frequency range to 140kHz by employing lower clock-to-f0 ratios. All devices are available in 24-pin DIP and small-outline packages in commercial, extended, and military temperature ranges.
characterization
-
Filter Design Software Available
-
Microprocessor Interface
-
64-Step Center Frequency Control
-
128-Step Q Control
-
Independent Q and f0 Programming
-
Guaranteed Clock to f0 Ratio-1% (A grade)
-
75kHz f0 Range (MAX262)
-
Single +5V and ±5V Operation
Application Areas
-
μP-Tuned Filters
-
Adaptive Filters
-
Anti-Aliasing Filters
-
Digital Signal Processing (DSP)
-
Phase-Locked Loops (PLLs)
-
Signal Analysis
(Product Image: Diagram)
Technical Parameters
-
Number of Channels
-
2
-
Cutoff Frequency
-
7.5 kHz
-
Supply Voltage Max
-
12.6 V
-
Supply Voltage Min
-
4.74 V
MAX260SOFT Datasheet
-
MAX260 data sheet for guidance
downloading