MAX263, MAX264, MAX267, MAX268 Pin-Programmable Universal and Bandpass Filters
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19-0597; Rev 4; 12/07 yn>jxiyn Pin Programmable Universal and Bandpass Filters ___General Description The MAX263/264 and MAX267/268 CMOS switched-capacitor active filters are designed for prcision filtering applications. Center frequency, Q, and oper-ating mode are ail selected via pin-strapped inputs. The MAX263/264 uses no external components for a variety of bandpass, lowpass, highpass, notch and allpass filters. The MAX267/268 is dedicated to bandpass applications and includes an uncommitted op-amp. Two second-order filter sections are included in both devices. An input clock and a 5-bit programming input precisely set the filter center/corner frequency. Q is also programmed from 0.5 to 64. Separate clock inputs for each filter half operate with either an external clock or a crystal. The MAX263 and 267 operate with center frequencies up to 57kHz while the MAX264 and 268 extend the fo range to 140kHz by employing lower fcLK/fo ratios. The MAX263/264 is supplied in 28 pin wide DIP and small outline packages while the MAX267/268 is supplied in 24 pin narrow DIP and wide SO packages. AN devices are available in commercial, extended, and military temprature ranges. Features S S Ci S S 1 00 ♦ 32-Step Center Frequency Control ♦ 128-Step Q Control ♦ Independent Q and f0 Programming ♦ Guaranteed Clock to f0 Ratio驗1% (A grade) ♦ 75kHz f0 Range (MAX264/268) ♦ Single +5V and ±5V Opration Ordering Information PART TEMP. RANGE PACKAGE* ACCURACY MAX263ACPI 0°C to +70° C Plastic DIP 1% MAX263BCPI 0°C to +70° C Plastic DIP 2% MAX263AEPI -40°C to +85°C Plastic DIP 1% MAX263BEPI -40°C to +85°C Plastic DIP 2% MAX263ACWI 0°C to +70° C Wide SO 1% MAX263BCWI 0°C to +70° C Wide SO 2% MAX263AMJI -55° C to +125°C CERDIP 1% MAX263BMJI -55° C to +125°C CERDIP 2% MAX264ACPI 0°C to +70° C Plastic DIP 1% MAX264BCPI 0°C to +70° C Plastic DIP 2% Applications Sonar and Avionics Instruments Anti-Aliasing Filters Digital Signal Processing Vibration and Audio Analysis Matched Tracking Filters (Ordering Information continue! at end of data sheet.) " MAX263/264 packages are 28-pin 0.6" wide DIP and 28-pin 0.3" wide SO (Small Outline). MAX267/268 packages are 24-pin 0.3" narrow DIP and 24-pin 0.3" wide SO (Small Outline). Typical Application Pin Configuration swiyjxiyfi MAX263 TOP VIEWS FILTER A CLK FILTER B (60Hz NOTCH) (120HJ NOTCH) JITL 20kHz MAX267 MAX268 (BANDPASS ONLY) Ml «驕» SI ot I« J>2 __q3 if" 02 mT] OSC OUT IfJOND lil v- __f1 m] 01 "ˮloo 5V V te LOGIC 0 LOGIC MODE 60Hz-120Hz NOTCH FILTER JV\J'YXAJV\___________Maxim Integrated Products 1 Forfree samples & the latest literature: httpj/www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.

Pin Programmable Uni versai and Bandpass Filters ELECTRICAL CHARACTERISTICS (Continued) (V+ = +5V, V- = -5V, CLKA = CLKB = ± 5V, 1.5MHz, fCLK/f0 = 197.92 for MAX263/67 and 138.23 for MAX264/68, Filter Mode 1, "1" = V+ and "0" = V" on F and Q inputs, TA = +25°C unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS Harmonie Distortion at f0 Q = 4, VIN = 1.5VPP -67 dB Supply Voltage Range Ta = TM|N to TMAX ±2.37 ±5 ±6.3 V Power Supply Current (Note 5) ta = TMIN *° tmax MAX263/67 MAX264/68 14 20 14 20 mA Shutdown Supply Current (Note 5) Q0-Q6 = ail 0 2.5 mA f0, Q Programming Inputs TA...

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Pin Programmable Unlversal and Bandpass Filters _Pin Description MAX263 MAX264 PIN # MAX267 MAX268 PIN # NAME FUNCTION 10 8 V+ Positive suppiy voltage 18 16 v~ Ngative suppiy voltage 19 17 GND Analog Ground. Connect to the System ground for dual suppiy opration or mid-supply for single suppiy op驩ration. GND should be well bypassed in single suppiy applications. 13 11 CLKa Input to the oscillator and clock input to section A. This clock is internally divided by 2. 14 12 CLKb Clock input to filter B. This clock is internally divided by 2 20 18 OSC OUT Connects to crystal for self clocked...

P/n Programmable Universal and Bandpass Filters 00 s I | SCN = SWITCH-CAPACITOR NETWORK N/HP/AP (MAX263/64 ONLY) H SCN - BP SCN > LP (MAX263/64 ONLY) r S1 S2 S3 t t t SCN MODE SELECT SCN U MO Ml (MAX263/64 ONLY) u O0-Q6 (TABLE 3) F0-F4 (TABLE 2) THE MAX267/68 OPERATES ONLY AS A MODE 1 BANDPASS. INTERNAL SWITCHES S1. S2, S3 ARE SHOWN FOR MODE 1. Figure 1. Filter Block Diagram (One Second-Order Section) Introduction The second-order sections in the MAX263/64/67/68 are identical and may be used as matched dual track-ing filters, or can be cascaded to form higher-order filters. They can also be...

Pin Programmable Universal and Bandpass Filters _Detailed Description fo and Q Programming Figure 2 shows a block diagram of a complte filter. Each 2nd-order filter section has its own clock input, however, package pin limitations require that f0, Q, and Mode control be shared by both sections. The actual center frequency is a function of the filter's clock rate, 5-bit f0 control word (see Table 2), and operating Mode. For some filter designs, the MAX263/64/67/68 may require separate docks for each second-order section since separate programming inputs are not provided. Such designs may be...