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DATA SHEET
The LND-FIL32-PKG
UP TO 48 CHANNEL VOLTAGE
MULTIPLEXER + BANDPASS FILTER
The LND-FIL309
Up to 48 Channel
Voltage Multiplexer
+ Bandpass Filter
What is the LND-FIL309?
The LND-FIL309 is an analog voltage multiplexer with up to 48 input channels, followed
by a pre-amp with pins for an external resistor to set gain. Digital logic inputs control
selection of the desired mux register. The mux can pass either AC or DC signals through
the selected line while simultaneously clamping all unused inputs to USEL. The mux
output is directly accessible, as is the output of the pre-amp. The centre frequency of
the bandpass filter is software adjustable. The output of the filter is buffered. The LNDFIL309 is particularly useful for using a single analysis channel to selectively examine
multiple analog sensor inputs using microcontroller control. Applications include embedded
systems, position controllers, and multi-channel filters. For customers with high volumes
requiring less than 48 input channels, Linear Dimensions can package the LND-FIL309
in packages with fewer pins.
How does it work?
Reset
To reset the device, set all data pins to zero, hold pin M and pin D low for at least 64
clock cycles, then return M and D to their quiescent (high) states. This clears the digital
state information on all internal registers.
Load Internal Registers
To select a mux channel, put the channel number onto the 6 bit wide data register and
pull M low and then high while D remains high. To select new channels simply repeat
the process with the appropriate mux channel number on the data inputs.
To Adjust Center Frequency
Select MUX address 63, put 1 on the data lines, pull both M and D low. Changing the
value on the data lines and pulling M and D low again will set the center frequency. The
center frequency will move linearly with the value written. To write new values repeat
the process.
How Do I get samples?
The LND-FIL309 is available in 84 pin PGA sample packages. Depending upon the
number of channels required, the device is available in most standard surface mount
and dip packages including 68-pin PLCC.
Features
•
Digitally select up to 48
input channels
•
Clamps all unused
channels to external pin
•
Select AC or DC voltages
•
Standard logic voltage
operation
•
Adjustable Bnadpass
Center Frequency
Applications
•
Sensor Arrays
•
Security Monitors
•
Input Devices
•
EmbeddedControllers
Linear Dimensions, Inc. 445 East Ohio Street, Chicago, IL 60611 p 312.3211810 f 312.321.1830
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