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- uP PROGRAMMABLE FILTERS: MAX260 MAX261 MAX262
- -----------------------------------------------------------------------------
- Filter type Universal Universal Universal
- -----------------------------------------------------------------------------
- Clock/Center freq ratio, approx 100-200 100-200 40-140
- CLK/fc ratio - Mode 2 only 71-142 71-142 28-100
- -----------------------------------------------------------------------------
- Max Center Frequency 7.5 KHz 30 KHz 75 KHz
- for Q > 8
- -----------------------------------------------------------------------------
- Q Register ( A,B independent ) 7 bits 7 bits 7 bits
- -----------------------------------------------------------------------------
- Clock Ratio Register 6 bits 6 bits 6 bits
- ( A and B independent )
- -----------------------------------------------------------------------------
- Independent A,B mode selection Yes Yes Yes
- -----------------------------------------------------------------------------
- Independent A and B Clock Yes Yes Yes
- -----------------------------------------------------------------------------
- Uncommitted op amps None 1 1
- -----------------------------------------------------------------------------
- Crystal or RC Clock Yes Yes Yes
- -----------------------------------------------------------------------------
- ***
- PIN PROGRAMMABLE FILTERS: MAX 263 MAX264
- -----------------------------------------------------------------------------
- Filter type Universal Universal
- -----------------------------------------------------------------------------
- Clock/Center Freq. Ratio 100-200 40-140
- CLK/fc Ratio - Mode 2 only 71-142 28-100
- -----------------------------------------------------------------------------
- Max Center Frequency for Q > 8 30 KHz 75 KHz
- for high Q
- -----------------------------------------------------------------------------
- Q Register ( A,B same value ) 7 bits 7 bits
- -----------------------------------------------------------------------------
- Clock Ratio Register 5 bits 5 bits
- ( A and B same value )
- -----------------------------------------------------------------------------
- Independent A and B mode selection No No
- -----------------------------------------------------------------------------
- Independent A and B Clock Yes Yes
- -----------------------------------------------------------------------------
- Crystal or RC Clock Yes Yes
- -----------------------------------------------------------------------------
- ***
- RESISTOR PROGRAMMABLE FILTERS: MAX 265 MAX266
- -----------------------------------------------------------------------------
- Filter type Universal Universal
- -----------------------------------------------------------------------------
- Clock/Center freq. Ratio 100-200 40-140
- ( Can be changed with resistors )
- -----------------------------------------------------------------------------
- Max Center Frequency for Q > 8 30 KHz 75 KHz
- -----------------------------------------------------------------------------
- Q Setting ( A,B independent ) Set with resistors Set with resistors
- -----------------------------------------------------------------------------
- Clock ratio pin setting, 6 bits 6 bits
- same both sides, further
- independently modifiable with resistors
- -----------------------------------------------------------------------------
- Independent A and B Clock Yes Yes
- -----------------------------------------------------------------------------
- Uncommitted op amps 2 2
- -----------------------------------------------------------------------------
- On-chip crystal or RC oscillator Yes Yes
- -----------------------------------------------------------------------------
- ***
- PROGRAMMABLE BANDPASS FILTERS: MAX 267 MAX268
- -----------------------------------------------------------------------------
- Filter type Bandpass only Bandpass only
- -----------------------------------------------------------------------------
- Clock/Center Freq. Ratio 100-200 40-140
- -----------------------------------------------------------------------------
- Max Center Frequency for Q > 8 30 KHz 75 KHz
- -----------------------------------------------------------------------------
- Q Register ( A and B Same Value ) 7 bits 7 bits
- -----------------------------------------------------------------------------
- Clock Ratio Register 5 bits 5 bits
- ( A and B Same Value )
- -----------------------------------------------------------------------------
- Uncommitted op amps 1 1
- -----------------------------------------------------------------------------
- Crystal or RC Clock Yes Yes
- -----------------------------------------------------------------------------
- ***
-
- THE FEATURES OF THIS PROGRAM
- -----------------------------------------------------------------------------
- Program PZ Given the type of filter ( Chebyshev, Butterworth, elliptic ),
- cutoff or center frequency, passband ripple, Q, atttenuation,
- PZ will calculate the center frequencies , Q's, zeros and the
- number of stages needed.
- -----------------------------------------------------------------------------
- Program RP For devices which use resistor programming, RP will calculate
- the values of the resistors, given the specs of the individual
- first or second order stages, worked out by PZ.
- -----------------------------------------------------------------------------
- Program RPCHECK Given any set of programming resistors, the clock ratio and
- clock frequency, RPCHECK will calculate the actual performance
- of a stage for all of the modes. This might be used to test the
- sensitivity to resistor tolerances of a design out of RP.
- -----------------------------------------------------------------------------
- Program MPP For digitally programmed filters MPP outputs the proper
- programming codes and describes the performance of the design
- when given the filter center frequencies and Q's.
- -----------------------------------------------------------------------------
- ***
- -----------------------------------------------------------------------------
- Program FR When a design of one or more double pole or single pole stages is
- completed using the above aids for setting up resistors and
- digital codes, FR will check the final assembly of stages when
- they are cascaded into one system. The output frequency response
- can be compared with that expected from PZ.
- -----------------------------------------------------------------------------
- Program BP In the special case of bandpass filters, another mode of
- implementation is the multiple feedback technique using the
- special parts MAX 267/268. Program BP will calculate the
- resistor values and give the frequency response which can be
- compared with that expected from PZ. This method has the benefit
- of requiring only one clock frequency for all stages and allows
- for arbitrary gain.
- -----------------------------------------------------------------------------
- Program FV The graphics program FV can be used directly from the menu or
- from inside Programs PZ, FR and BP. It will display on the screen
- graphical representations of gain, phase and group delay using as
- input data the files developed by PZ, FR and BP.
- ***
- PROGRAM OUTPUT FILES ( Engineering reports and frequency response listings )
-
- PZ First run of PZ: report file is PZ1.R and frequency response files are
- PZ1A, PZ1B,. . . . . .PZ1I etc. for 9 possible runs
- Ninth run of PZ: summary file is PZ9.R and frequency response files are
- PZ9A, PZ9B,. . . . . .PZ9I
-
- RP First run report file is RP1.R and so on for 9 runs
- Ninth run report file is RP9.R
-
- RPCHECK First run report file is CHECK1.R and so on for 9 runs
- Ninth run report file is CHECK9.R
-
- MPP First run report file is MPP1.R and so on for 9 runs
- Ninth run report file is MPP9.R
-
- FR First run output files for different frequency response conditions
- are FR1A, FR1B etc for 9 possible files to FR1I
- for 9 runs down to FR9A, FR9B, . . . . . . . FR9I
-
- BP First run gives BP1.R and then BP1A . . . . . BP1I
- Ninth run gives BP9.R and then BP9A . . . . . BP9I
- ***
- NOTES ON OUTPUT FILES
-
- As noted above the programs generate two types of files, report files and
- frequency response files. The program names the files automatically starting
- with '1' and 'A' and then successively going to 2, 3 ... and B, C, ....
- Report files give design information and have a subscript ".R" while frequency
- response files which can be used by the graphics package have no subscript.
-
- AUTOMATIC RENAMING OF OUTPUT FILES
-
- The program names the files automatically and always uses the same names.
- Consequently any old files in the directory would be overwritten and lost if
- the program did not rename them. However, the program does check to see if a
- file of the same name exists and renames it by adding a letter to the end of
- the name so that the name is unique in the directory.
- Examples: PZ1.R may be renamed PZ1.RA; BP1A may be renamed BP1A.C
- The first letter which results in a unique name is appended for renaming.
-
-
- ***
- BROWSING IN FILES
-
- It is often necessary to use the output of one program as the input for another
- one. For instance, the output of PZ in file PZ1.R would be needed to provide
- the pole, zero, Q information for either MPP or RP. The existing output files
- can be conveniently examined directly from the main menu by using the BROWSE
- option which gives access to all files in the working directory. Data can
- be noted by hand or the PRINT SCREEN feature of the keyboard may be used to
- print the pertinent passages.
-
- MISCELLANEOUS HINTS
-
- In many cases where the user is asked for a Y/N answer to a question, the
- negative option may be taken by pressing RETURN without typing a letter.
- In almost all cases answers may be lower or uppercase without affecting the
- result. In case the user wishes to abort a program, pressing CONTROL-BREAK
- will return the user to DOS.
- ***
- USE OF TITLES ON FILES
-
- The first line of every output file is a main title which would normally be
- the title of the overall project. This title also appears on the top of the
- graphics display. The user gets the opportunity to make this title at the
- startup of FILTER.
-
- The second line of every output file has the date and time of the start of the
- subprogram and the subtitle which can be written at the start of each
- subprogram. The same first and second line titles, with the same time and date
- will be on all files of the same run and can be used to connect the design
- data to the proper frequency response data. The second line title helps to
- identify files in the BROWSE option and in FV graphics.
-
- FURTHER HELP
-
- Each individual program has its own help file which may be invoked after
- selecting the program.
- ***
-