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MAX260BEWG+

hot MAX260BEWG+

MAX260BEWG+

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Part Number MAX260BEWG+
Manufacturer Maxim Integrated
Description IC FILTER ACT MPU PROG 24-SOIC
Datasheet MAX260BEWG+ Datasheet
Package 24-SOIC (0.295", 7.50mm Width)
In Stock 824 piece(s)
Unit Price $ 15.98 *
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MAX260BEWG+

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MAX260BEWG+ Specifications

ManufacturerMaxim Integrated
CategoryIntegrated Circuits (ICs) - Interface - Filters - Active
Datasheet MAX260BEWG+ Datasheet
Package24-SOIC (0.295", 7.50mm Width)
Series-
Filter TypeUniversal Switched Capacitor
Frequency - Cutoff or Center7.5kHz
Number of Filters2
Filter Order2nd
Voltage - Supply4.74 V ~ 12.6 V, ��2.37 V ~ 6.3 V
Mounting TypeSurface Mount
Package / Case24-SOIC (0.295", 7.50mm Width)
Supplier Device Package24-SOIC

MAX260BEWG+ Datasheet

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General Description 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 a variety of band- pass, lowpass, highpass, notch, and allpass configura- tions. Each device contains two second-order filter sections that place center frequency, Q, and filter oper- ating mode under programmed control. An input clock, along with a 6-bit f0 program input, determine the filter's center or corner frequency without affecting other filter parameters. The filter Q is also pro- grammed independently. Separate clock inputs for each filter section operate with either a crystal, RC net- work, or external clock generator. The MAX260 has offset and DC specifications superior to the MAX261 and MAX262 and a center frequency (f0) range of 7.5kHz. The MAX261 handles center fre- quencies to 57kHz, while the MAX262 extends the cen- ter 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. Applications µP-Tuned Filters Anti-Aliasing Filters Digital Signal Processing Adaptive Filters Signal Analysis Phase-Locked Loops Features  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 M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters ________________________________________________________________ Maxim Integrated Products 1 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 LPA INB LPB BPBN.C. HPA N.C. BPA TOP VIEW D0 OSC OUT GND V-CLK OUT A3 D1 INA 16 15 14 13 9 10 11 12 WR A0 HPB A1CLKB CLKA A2 V+ MAX260 24 23 22 21 20 19 18 17 1 2 3 4 5 6 7 8 LPA INB LPB BPBOP IN HPA OP OUT BPA HPB D0 OSC OUT V- CLK OUT A3 D1 INA 16 15 14 13 9 10 11 12 WR GND A0 A1CLKB CLKA A2 V+ MAX261 MAX262 Pin Configurations Ordering Information OUTPUT BPHPLPINBPHPLPIN INPUT +5V V+ GND -5V V- CLKA OSC CLKOUT CLKB PROGRAM INPUTS CRYSTAL FOURTH-ORDER BANDPASS FILTER MAX260 MAX261 MAX262 FILTER A FILTER B Functional Diagram 19-0352; Rev 2; 7/02 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PACKAGE A C C U R A C Y MAX260ACNG 0°C to +70°C Plastic DIP 1% MAX260BCNG 0°C to +70°C Plastic DIP 2% MAX260AENG -40°C to +85°C Plastic DIP 1% MAX260BENG -40°C to +85°C Plastic DIP 2% MAX260ACWG 0°C to +70°C Wide SO 1% MAX260BCWG 0°C to +70°C Wide SO 2% MAX260AMRG -55°C to +125°C CERDIP 1% MAX260BMRG -55°C to +125°C CERDIP 2% *All devices—24-pin packages 0.3in-wide packages Ordering Information continued at end of data sheet.

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters 2 _______________________________________________________________________________________ ABSOLUTE MAXIMUM RATINGS Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Total Supply Voltage (V+ to V-) .............................................15V Input Voltage, any pin ..........................(V- - 0.3V) to (V+ + 0.3V) Input Current, any pin ......................................................±50mA Power Dissipation Plastic DIP (derate 8.33mW/°C above 70°C) ...............660mW CERDIP (derate 12.5mW/°C above 70°C) .................1000mW Wide SO (derate 11.8mW/°C above 70°C) ..................944mW Operating Temperature Ranges MAX260/MAX261/MAX262XCXG .......................0°C to +70°C MAX260/MAX261/MAX262XEXG .....................-40°C to +85°C MAX260/MAX261/MAX262XMXG ..................-55°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (Soldering, 10s) ................................+300°C ELECTRICAL CHARACTERISTICS (V+ = +5V, V- = -5V, CLKA = CLKB = ±5V 350kHz for the MAX260 and 1.5MHz for the MAX261/MAX262, fCLK/f0 = 199.49 for MAX260/MAX261 and 139.80 for MAX262, Filter Mode 1, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS f0 Center Frequency Range See Table 1 Maximum Clock Frequency See Table 1 MAX260A ±0.2 ±1.0 MAX260B ±0.2 ±2.0 MAX261/MAX262A ±0.2 ±1.0 fCLK/f0 Ratio Error (Note 1) TA = TMIN to TMAX MAX261/MAX262B ±0.2 ±2.0 % f0 Temperature Coefficient -5 ppm/°C Q = 8 MAX260A ±1 ±6 Q = 8 MAX260B ±1 ±10 Q = 32 MAX260A ±2 ±10 Q = 32 MAX260B ±2 ±15 Q = 64 MAX260A ±4 ±20 Q = 64 MAX260B ±4 ±25 Q = 8 MAX261/MAX262A ±1 ±6 Q = 8 MAX261/MAX262B ±1 ±10 Q = 32 MAX261/MAX262A ±2 ±10 Q = 32 MAX261/MAX262B ±2 ±15 Q = 64 MAX261/MAX262A ±4 ±20 Q Accuracy (deviation from ideal continuous filter) (Note 2) TA = TMIN to TMAX Q = 64 MAX261/MAX262B ±4 ±25 % Q Temperature Coefficient ±20 ppm/°C MAX260 ±0.1 ±0.3 DC Lowpass Gain Accuracy MAX261/MAX262 ±0.1 ±0.5 dB MAX260 -5 MAX261/MAX262 -5Gain Temperature Coefficient Lowpass (at D.C.) Bandpass (at f0) MAX260/MAX261/MAX262 +20 ppm/°C

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (V+ = +5V, V- = -5V, CLKA = CLKB = ±5V 350kHz for the MAX260 and 1.5MHz for the MAX261/MAX262, fCLK/f0 = 199.49 for MAX260/MAX261 and 139.80 for MAX262, Filter Mode 1, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS MAX260A ±0.05 ±0.25 MAX260B ±0.15 ±0.45 MAX261A ±0.40 ±1.00 MAX261B ±0.80 ±1.60 MAX262A ±0.40 ±1.20 TA = TMIN to TMAX, Q = 4 Mode 1 MAX262B ±0.80 ±1.60 MAX260A ±0.075 ±0.30 MAX260B ±0.075 ±0.50 MAX261A ±0.50 ±1.10 MAX261B ±0.90 ±1.60 MAX262A ±0.50 ±1.30 Offset Voltage At Filter Outputs—LP, BP, HP (Note 3) Mode 3 MAX262B ±0.90 ±1.60 V Offset Voltage Temperature Coefficient fCLK/f0 = 100.53, Q = 4 TA = TMIN to TMAX ±0.75 mV/°C Clock Feedthrough ±4 mV Crosstalk -70 dB Q = 1, 2nd-Order, LP/BP See Typ. Oper. Char. 4th-Order LP (Figure 26) 90Wideband Noise 4th-Order BP (Figure 24) (Note 4) 100 µVRMS Harmonic Distortion at f0 Q = 4, VIN = 1.5VP-P -67 dB Supply Voltage Range TA = TMIN to TMAX ±2.37 ±5 ±6.3 V MAX260 15 20 MAX261 16 20Power Supply Current (Note 5) TA = TMIN to TMAX CMOS Level Logic Inputs MAX262 16 20 mA Shutdown Supply Current Q0A - Q6A = all 0, CMOS Level Logic Inputs (Note 5) 1.5 mA INTERNAL AMPLIFIERS Output Signal Swing TA = TMIN to TMAX, 10kΩ load (Note 6) ±4.75 V Source 50 Output Signal Circuit Current Sink 2 mA Power Supply Rejection Ratio 0Hz to 10kHz -70 dB Gain Bandwidth Product 2.5 MHz Slew Rate 6 V/µs

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters 4 _______________________________________________________________________________________ ELECTRICAL CHARACTERISTICS (for V± = ±2.5V ±5%) (V+ = +2.37V, V- = -2.37V, CLKA = CLKB = ±2.5V 250kHz for the MAX260 and 1MHz for the MAX261/MAX262, fCLK/f0 = 199.49 for MAX260/MAX261 and 139.80 for MAX262, Filter Mode 1, TA = +25°C, unless otherwise noted.) PARAMETER CONDITIONS MIN TYP MAX UNITS f0 Center Frequency Range (Note 7) Maximum Clock Frequency (Note 7) MAX26XA ±0.1 1fCLK/f0 Ratio Error (Notes 1, 8) Q = 8 MAX26XB ±0.1 2 % MAX260A ±2 ±6Q = 8 fCLK/f0 = 199.49 MAX260B ±2 ±10 MAX261A ±2 ±6 fCLK/f0 = 199.49 MAX261B ±2 ±10 MAX262A ±2 ±6 Q Accuracy (deviation from ideal continuous filter) (Notes 2, 8) fCLK/f0 = 139.80 MAX262B ±2 ±10 % Output Signal Swing All Outputs (Note 6) ±2 V Power Supply Current CMOS Level Logic Inputs (Note 5) 7 mA Shutdown Current CMOS Level Logic Inputs (Note 5) 0.35 mA Note 1: fCLK/f0 accuracy is tested at 199.49 on the MAX260/MAX261, and at 139.8 on the MAX262. Note 2: Q accuracy tested at Q = 8, 32, and 64. Q of 32 and 64 tested at 1/2 stated clock frequency. Note 3: The offset voltage is specified for the entire filter. Offset is virtually independent of Q and fCLK/f0 ratio setting. The test clock frequency for mode 3 is 175kHz for the MAX260 and 750kHz for the MAX261/MAX262. Note 4: Output noise is measured with an RC output smoothing filter at 4 ✕ f0 to remove clock feedthrough. Note 5: TTL logic levels are: HIGH = 2.4V, LOW = 0.8V. CMOS logic levels are: HIGH = 5V, LOW = 0V. Power supply current is typi- cally 4mA higher with TTL logic and clock input levels. Note 6: On the MAX260 only, the HP output signal swing is typically 0.75V less than the LP or BP outputs. Note 7: At ±2.5V supplies, the f0 range and maximum clock frequency are typically 75% of values listed in Table 1. Note 8: fCLK/f0 and Q accuracy are a function of the accuracy of internal capacitor ratios. No increase in error is expected at ±2.5V as compared to ±5V; however, these parameters are only tested to the extent indicated by the MIN or MAX limits. INTERFACE SPECIFICATIONS (Note 9) (V+ = +5V, V+ = -5V, TA = +25°C, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS WR Pulse Width tWR 250 150 ns Address Setup tAS 25 ns Address Hold tAH 0 ns Data Setup tDS 100 50 ns Data Hold tDH 10 0 ns Logic Input High VIH WR, D0, D1, A0–A3, CLKA, CLKB TA =TMIN to TMAX 2.4 V Logic Input Low VIL WR, D0, D1, A0–A3, CLKA, CLKB TA =TMIN to TMAX 0.8 V 10 60Input Leakage Current IIN WR, D0, D1, A0–A3, CLKB CLKA TA =TMIN to TMAX 6 µA Input Capacitance CIN WR, D0, D1, A0–A3, CLKA, CLKB 15 pF Note 9: Interface timing specifications are guaranteed by design and are not subject to test.

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters _______________________________________________________________________________________ 5 Pin Description PIN MAX260 MAX261/ MAX262 NAME FUNCTION 9 9 V + Positive supply voltage 17 16 V - Negative supply voltage 18 17 GND Analog Ground. Connect to the system ground for dual supply operation or mid-supply for single sup- ply operation. GND should be well bypassed in single supply applications. 11 11 CLKA Input to the oscillator and clock input to section A. This clock is internally divided by 2. 12 12 CLKB Clock input to filter B. This clock is internally divided by 2. 8 8 CLK OUT C l ock outp ut for cr ystal and R- C osci l l ator op er ati on 19 18 OSC OUT Connects to crystal or R-C for self-clocked operation PIN MAX260 MAX261/ MAX262 NAME FUNCTION 5, 23 5, 23 INA, INB Filter inputs 1, 21 1, 21 BPA, BPB Bandpass outputs 24, 22 24, 22 LPA, LPB Lowpass outputs 3, 14 3, 20 HPA, HPB Highpass/notch/allpass outputs 16 15 WR Write enable input 15, 13, 10, 7 14, 13, 10, 7 A0, A1, A2, A3 Address inputs for f0 and Q input data locations 20, 6 19, 6 D0, D1 Data inputs for f0 and Q programming 2 OP OUT Outp ut of uncom m i tted op am p on M AX 261/ M AX 262 onl y. P i n 2 i s a no- connect on the M AX 260. 4 OP IN Inver ti ng i np ut of uncom - m i tted op am p on M AX 261/ M AX 262 onl y ( noni nver ti ng i np ut i s i nter nal l y connected to g r ound ) . P i n 4 i s a no- connect on the M AX 260.

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters 6 _______________________________________________________________________________________ Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) -20 -10 10 0 20 30 0.2 0.60.4 0.8 1.0 1.2 1.4 Q ERROR vs. CLOCK FREQUENCY MAX260 M A X 2 6 0 /6 1 /6 2 t o c0 1 CLOCK FREQUENCY (MHz) Q E R R O R ( % ) MODE 4±5V 25°C Q = 8 fCLK/f0  N = 0 MODES 2 & 3 MODE 1 5 10 15 20 25 IDD vs. POWER SUPPLY VOLTAGE M A X 2 6 0 /6 1 /6 2 t o c0 2 V+ TO V- (V) I D D ( m A ) 5 8 96 7 10 11 12 CLK FREQ = 500KHz 25°C CONTROL PINS (5V, 0V) CLOCKS (5V, 0V) CLOCKS (5V, -5V) 13 15 14 17 16 19 18 20 0.5 1.5 2.5 3.5 IDD vs. CLOCK FREQUENCY M A X 2 6 0 /6 1 /6 2 t o c0 3 CLOCK FREQUENCY (MHz) I D D ( m A ) CLOCK (2.4V, 0.8V) CLOCK (5V, 0V) ±5V CONTROL PINS (5V, 0V) 25°C CLOCK (5V, -5V) -4 0 4 8 12 16 20 0.5 1.51.0 2.0 2.5 3.0 3.5 Q ERROR vs. CLOCK FREQUENCY MAX261/MAX262 M A X 2 6 0 /6 1 /6 2 t o c0 4 CLOCK FREQUENCY (MHz) Q E R R O R ( % ) MODE 3 MODE 2 MODES 1, 4 ±5V Q = 8 TA = 25°C  N = 0 fCLK f0 -1.2 -1.0 -0.8 -0.6 -0.4 -0.2 0 0.2 1.0 1.5 2.0 2.5 3.0 3.5 FCLK/F0 ERROR vs. CLOCK FREQUENCY MAX261/MAX262 M A X 2 6 0 /6 1 /6 2 t o c0 5 CLOCK FREQUENCY (MHz) F C LK /F 0 ER R O R ( % ) MODES 2, 3 MODES 1, 4±5V Q = 8 TA = 25°C fCLK f0  N = 0 0 2 1 4 3 7 6 5 8 0.2 1.00.6 1.4 1.8 2.2 2.8 3.0 OUTPUT SIGNAL SWING vs. CLOCK FREQUENCY M A X 2 6 0 /6 1 /6 2 t o c0 6 CLOCK FREQUENCY (MHz) P EA K T O P EA K , O U TP U T S W IN G ( V ) MAX261/MAX262 ALL MODES MAX260 MODE 4 ±5V 25°C Q = 8 fCLK/f0  N = 0 MAX260 MODES 1, 2, 3 Q = 1 Q = 8 Q = 64 MODE LP BP HP/AP/N LP BP HP/AP/N LP BP HP/AP/N 1 -84 -90 -84 -80 -82 -85 -72 -73 -85 2 -88 -90 -88 -84 -82 -84 -77 -73 -76 3 -84 -90 -88 -80 -82 -82 -73 -73 -74 M A X 2 6 1 / M A X 2 6 2 4 -83 -89 -84 -79 -81 -85 -71 -73 -85 1 -87 -89 -86 -81 -81 -86 -73 -73 -86 2 -89 -88 -85 -83 -80 -82 -75 -72 -74 3 -87 -88 -85 -80 -82 -80 -71 -72 -72 M A X 2 6 0 4 -87 -88 -86 -81 -81 -86 -71 -72 -86 MEASUREMENT BANDWIDTH Q = 1 Q = 8 Q = 64 Wideband -84 -80 -72 3kHz -87 -87 -86 C Message Weighted -93 -93 -93 Wideband RMS Noise (db ref. to 2.47VRMS, 7VP-P) ±5V Supplies Note 1: fCLK = 1MHz for MAX261/MAX262, fCLK = 350kHz for MAX260 Note 2: fCLK/f0 ratio programmed at N = 63 (see Table 2) Note 3: Clock feedthrough is removed with an RC lowpass ar 4f0, ie., R = 3.9kΩ, C = 2000pF for MAX261. Noise Spectral Distribution (MAX261, fCLK = 1MHz, dB ref. to 2.47VRMS, 7VP-P)

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters _______________________________________________________________________________________ 7 Introduction Each MAX260/MAX261/MAX262 contains two second- order switched-capacitor active filters. Figure 1 shows the filter's state variable topology, employed with two cascaded integrators and one summing amplifier. The MAX261 and MAX262 also contain an uncommitted amplifier. On-chip switches and capacitors provide feedback to-control each filter section's f0 and Q. Internal capacitor ratios are primarily responsible for the accuracy of these parameters. Although these switched-capacitor networks (SCN) are in fact sampled systems, their behavior very closely matches that of continuous filters, such as RC active filters. The ratio of the clock frequency to the filter center frequency (fCLK/f0) is kept large so that ideal second-order state- variable response is maintained. The MAX262 uses a lower range of sampling (fCLK/f0) ratios than the MAX260 or MAX261 to allow higher operating f0 frequencies and signal bandwidths. These reduced sample rates result in somewhat more devia- tion from ideal continuous filter parameters than with the MAX260/MAX261. However, these differences can be compensated using Figure 20 (see Application Hints) or Maxim's filter design software. The MAX260 employs auto-zero circuitry not included in the MAX261 or MAX262. This provides improved DC characteristics, and improved low-frequency perform- ance at the expense of high-end f0 and signal band- width. The N/HP/AP outputs of the MAX260 are internal- ly sample-and-held as a result of i ts auto-zero operation. Signal swing at this output is somewhat reduced as a result (MAX260 only). See Table 1 for bandwidth comparisons of the three filters. Maxim also provides design programs that aid in con- verting filter response specifications into the f0 and Q program codes used by the MAX260 series devices. This software also precompensates f0 and Q when low sample rates are used. It is important to note that, in all MAX260 series filters, the filter's internal sample rate is one half the input clock rate (CLKA or CLKB) due to an internal division by two. All clock-related data, tables, and other dis- cussions in this data sheet refer to the frequency at the CLKA or CLKB input, i.e., twice the internal sample rate, unless specifically stated otherwise. Quick Look Design Procedure The MAX260, MAX261, and MAX262, with Maxim's filter design software, greatly simplify the design procedures for many active filters. Most designs can be realized using a three-step process described in this section. If the design software is not used, or if the filter complexi- ty is beyond the scope of this section, refer to the remainder of this data sheet for more detailed applica- tions and design information. M1M0 S2 SCNIN S3S1 MODE SELECT SCN Q0–Q6 (TABLE 3) F0–F5 (TABLE 2) S1 SAMPLE-HOLD MAX260 ONLY N/HP/AP BP LP S2 S3 + - - SCN = SWITCH-CAPACITOR NETWORK + - ∫ ∫ SCN SCN Σ S-H Figure 1. Filter Block Diagram (One Second-Order Section)

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters 8 _______________________________________________________________________________________ Step 1—Filter Design Start with the program “PZ” to determine what type of f i l ter is needed. This helps determine the type (Butterworth, Chebyshev, etc.) and the number of poles for the optimum choice. The program also plots the fre- quency response and calculates the pole/zero (f0) and Q values for each second-order section. Each MAX260/MAX261/MAX262 contains two second-order sections, and devices can be cascaded for higher order filters. MAX260 MAX261* MAX262* INA OUT IN 5 24 3 1 23 22 (20)14 21 LPA HPA BPA LPB HPB BPB INB WR D0 D1 A0 A2 A3 CLKA CLKB A1 16(15) 20(19) 6 1 2 3 4 5 6 7 11 24 25 23 22 21 20 19 18 DB-25 MALE PLUG (BACK VIEW) 12 15(14) 10 7 11 12 9 18(17) 17(16) CLK IN TTL (SEE FIGURE 4) 0.1µF 0.1µF -5V+5V 13 V+ V-GND *PIN NUMBERS IN ( ) ARE FOR MAX261/MAX262 100 AB$ = "FILTER A" : GOSUB 150 : REM GET DATA FOR SECTION A 110 ADD = 0 : GOSUB 220 : REM WRITE DATA TO THE PRINTER PORT 120 AB$ = "FILTER B" : GOSUB 150 : REM GET DATA FOR B 130 ADD = 32 : GOSUB 220 : REM WRITE DATA TO PRINTER PORT 140 GOTO 100 150 PRINT "MODE (1 to 4, see Table 5) "; AB$; : INPUT M 160 IF M<1 OR M>4 THEN GOTO 150 170 PRINT "CLOCK RATIO (0 to 63, N of Table 2) "; AB$; : INPUT F 180 IF F<0 OR F>63 THEN GOTO 170 190 PRINT "Q (0 to 127, N of Table 3) "; AB$; : INPUT Q 200 IF Q<0 OR Q>127 THEN GOTO 190 ELSE : PRINT 210 RETURN 220 LPRINT CHR$(ADD+M-1); : ADD = ADD+4 230 FOR I = 1 TO 3 240 X = (ADD + (F - 4*INT(F/4))) : LPRINT CHR$(X); 250 F=INT(F/4) : ADD = ADD + 4 260 NEXT I 270 FOR I = 1 TO 4 280 X=(ADD + (Q - 4*INT(Q/4))) : LPRINT CHR$(X); 290 Q=I (Q/4) :: ADD = ADD + 4 300 NEXT I 310 RETURN Figure 2. Basic Program and Hardware Connections to Parallel Printer Port for “Quick Look” Using a PC

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M A X 2 6 0 /M A X 2 6 1 /M A X 2 6 2 Microprocessor Programmable Universal Active Filters _______________________________________________________________________________________ 9 Step 2—Generate Programming Coefficients Starting with the f0 and Q values obtained in Step 1, use the program “MPP” to generate the digital coefficients that program each second-order section's f0 and Q. The program displays values for “N” (“N = _ for f0” and “N = _ for Q”). N is the decimal equivalent of the binary code that sets the filter section’s f0 or Q. These are the same “N”s that are listed in Tables 2 and 3. An input clock frequency and filter mode must also be selected in this step; however, if a specific-clock rate is not selected, “GEN” picks one. With regard to mode selection, mode 1 is the most convenient choice for most bandpass and lowpass filters. Exceptions are elliptic bandpass and lowpass filters, which require mode 3. Highpass filters also use mode 3, while allpass filters use mode 4. For further information regarding these filter modes, see the Filter Operating Modes sec- tion. Step 3—Loading the Filter When the N values for the f0 and Q of each second- order filter section are determined, the filter can then be programmed and operated. What follows is a con- venient method of programming the filter and evalu- ating a design if a PC is available. A short BASIC program loads data into the MAX260/ MAX261/MAX262 through the PC's parallel printer port. The program asks for the filter mode, as well as the N values for the f0 and Q of each section. These coeffi- cients are then loaded into the filter in the form of ASCII characters. This program can be used with or without Maxim's other filter design software. The program and the appropriate hardware connections for a Centronics- type printer port are shown in Figure 2. Filter Design Software Maxim provides software programs to help speed the transition from frequency response design require- ments to working hardware. A series of programs are available, including: Program PZ. Given the requirements, such as center frequency, Q, passband ripple, and stopband attenua- tion, PZ calculates the pole frequencies, Q's, zeros, and the number of stages needed. Program MPP. For programmed filters, MPP computes the input codes to use and describes the expected performance of the design. Program FR. When a design of one or more stages is completed, FR checks the final cascaded assembly. The output frequency response can be compared with that expected from PZ. Program PR.BAS Allows a MAX260/MAX261/MAX262 to be programmed through a personal computer. The mode, f0, and Q of each section are typed in, and the proper codes are sent to the filter through the comput- er’s parallel printer port. This program is also provided in Figure 2. Other design programs are also included for use with other Maxim filter products. Other Filter Products Maxim has developed a number of other filter products in addition to the MAX260, MAX261, and MAX262. PIN-PROGRAMMABLE ACTIVE FILTERS—A dual sec- ond-order universal filter that needs no external compo- nents. A microprocessor interface is not required. MAX263 0.4Hz to 30kHz f0 range MAX264 1Hz to 75kHz f0 range RESISTOR AND PIN-PROGRAMMABLE FILTERS—A dual second-order universal filter where f0 adjustment beyond pin-programmable resolution employs external resistors. MAX265 0.4Hz to 30kHz f0 range. Includes two uncommitted op amps. MAX266 1Hz to 75kHz f0 range. Includes two un- committed op amps. MF10 Industry Standard, Resistor Programmed Only PIN-PROGRAMMABLE BANDPASS FILTERS—A dual second-order bandpass that needs no external components. A microprocessor interface is not required. MAX267 0.4Hz to 30kHz f0 range MAX268 1Hz to 75kHz f0 range PROGRAMMABLE ANTI-ALIAS FILTER—A program- mable dual second-order continuous (not switched) lowpass filter. No clock noise is generated. Designed for use as an anti-alias filter in front of, or as a smooth- ing filter following, any sampled filter or system. MAX270 1kHz to 25kHz Cutoff Frequency Range 5th-ORDER LOW PASS FILTER—Features zero offset and drift errors for designs requiring high DC accuracy. MAX280, LT1062 0.1Hz to 20kHz Cutoff Frequency Range

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Rosa*****Sharp

February 10, 2020

Worked wonderfully. Went through the instructions to the tea to make sure it was done correctly.

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February 4, 2020

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January 15, 2020

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January 12, 2020

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November 29, 2019

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November 29, 2019

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November 17, 2019

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October 27, 2019

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October 23, 2019

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