MAX260ACWG 查看數據表（PDF） - Maxim Integrated
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MAX260ACWG Datasheet PDF : 26 Pages
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Microprocessor Programmable
Universal Active Filters
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
WR 16(15)
5
IN
INA
24
20(19)
D0
LPA
6
D1
3
HPA
15(14)
A0
1
BPA
MAX260
MAX261*
A1 13
23 INB
MAX262*
A2 10
22 LPB
A3 7
(20)14 HPB
CLKA 11
21 BPB
CLKB 12
OUT
V+
GND
V-
9
18(17)
17(16)
CLK IN
1
25
2
24
3
23
4
22
5
21
6
20
7
19
18
11
12
DB-25 MALE PLUG
(BACK VIEW)
0.1µF
+5V
0.1µF
-5V
TTL
(SEE FIGURE 4)
*PIN NUMBERS IN ( ) ARE FOR MAX261/MAX262
Figure 2. Basic Program and Hardware Connections to Parallel Printer Port for “Quick Look” Using a PC
Step 1—Filter Design
Start with the program “PZ” to determine what type of
filter 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.
8 _______________________________________________________________________________________
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