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1988-03-03
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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.
***