MAX260ACNG Maxim Integrated Products, MAX260ACNG Datasheet - Page 9

• Manufacturer Part Number: MAX260ACNG
• Description: Active Filter
• Manufacturer: Maxim Integrated Products

Specifications of MAX260ACNG

• Number Of Channels: 2
• Cutoff Frequency: 7.5 KHz
• Supply Voltage (max): 12.6 V
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Supply Voltage (min): 4.74 V
• Package / Case: PDIP N-24
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Starting with the f
the program “MPP” to generate the digital coefficients
that program each second-order section's f
program displays values for “N” (“N = _ for f
_ for Q”). N is the decimal equivalent of the binary code
that sets the filter section’s f
“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.
When the N values for the f
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 f
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.
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.
Step 2—Generate Programming
0
0
and Q of each section. These coeffi-
_______________________________________________________________________________________
and Q values obtained in Step 1, use
Filter Design Software
Step 3—Loading the Filter
0
0
or Q. These are the same
and Q of each second-
Coefficients
Microprocessor Programmable
0
0
and Q. The
” and “N =
Universal Active Filters
Program PR.BAS Allows a MAX260/MAX261/MAX262
to be programmed through a personal computer. The
mode, f
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.
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 f
MAX264 1Hz to 75kHz f
RESISTOR AND PIN-PROGRAMMABLE FILTERS—A
dual second-order universal filter where f
beyond pin-programmable resolution employs external
resistors.
MAX265 0.4Hz to 30kHz f
MAX266 1Hz to 75kHz f
MF10
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 f
MAX268 1Hz to 75kHz f
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
, and Q of each section are typed in, and the
uncommitted op amps.
committed op amps.
Industry Standard, Resistor Programmed Only
0.1Hz to 20kHz Cutoff Frequency
Range
Other Filter Products
0
0
range
range
0
0
0
range
range
range. Includes two un-
0
range. Includes two
0
adjustment
9