DATA SHEET
The LND-RES81
Features
•
ExTREmely simple interface
•
Microcontroller friendly
•
Any value from 10k to 100k
with 20% accuracy & 1k
increments
•
Will not shift over time like
standard variable
potentiometers
•
Trim with automated
equipment rather than
manually
Applications
•
Frequency Synthesis
•
Digital Wireless
•
Wireless Lans
•
GSM, PCN, DECT, CT2,CTI
Linear Dimensions, Inc. 445 East Ohio Street, Chicago, IL 60611 p 312.3211810 f 312.321.1830
100K , 20%, 7 BIT SILICON RESISTOR
Ω
The LND-RES81
100k , 20%, 7 Bit
Silicon Resistor
What is the LND-RES81?
The LND-RES81 is a variable resistor for logic level applications. The device
is capable of operating from 10k to 100k with 20% accuracy, and 1k increments.
Though absolute tolerance is 20%, an automated testing machine can easily
tune the device to within 10% accuracy. The device is a very simple configuration
of resistors and shorting MOSFETS; perfect for use with basic microcontrollers.
The beauty of the device is its simplicity, lack of long term drift, and low cost
compared to standard trim pots.
How Does it Work?
Simply connect power (5V) and ground. Connect the in and out terminals in
place of your variable resistor. Connect the 7 data bits. Each data bit controls
a switch across resistors each of which is twice the resistance of the less
significant bit. In this way every value between 10k and 100k can be
accomodated. By turning on and off the data bits, the resistance with vary
linearly between 10k and 100k based on the value on the 7-bit data channel.
To create a three pin potentiometers, connect two LND-RES81 in series and
take the output in the middle. In this way, a 200k trim pot can be replicated.
How Do I Get Samples?
The LND-RES81 comes in a 28 pin ceramic package for testing purposes.
Volume production is available in most standard packages including 10-pin
SOIC or SSOP. Contact your regional Linear Dimensions sales representative
for more information.
Ω
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