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LM331N Datasheet(PDF) 8 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM331N
Description  Precision Voltage-to-Frequency Converters
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 8 page
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Typical Applications (Continued)
DETAILS OF OPERATION FREQUENCY-TO-
VOLTAGE CONVERTERS
(FIGURES 5 AND 6 )
In these applications a pulse input at fIN is differentiated by
a C-R network and the negative-going edge at pin 6 causes
the input comparator to trigger the timer circuit Just as with
a V-to-F converter the average current flowing out of pin 1
is IAVERAGE e i c (11 RtCt) c f
In the simple circuit of
FIGURE 5 this current is filtered in
the network RL e 100 kX and 1 mF The ripple will be less
than 10 mV peak but the response will be slow with a
01 second time constant and settling of 07 second to
01% accuracy
In the precision circuit an operational amplifier provides a
buffered output and also acts as a 2-pole filter The ripple
will be less than 5 mV peak for all frequencies above 1 kHz
and the response time will be much quicker than in
Figure 5
However for input frequencies below 200 Hz this circuit will
have worse ripple than
Figure 5 The engineering of the filter
time-constants to get adequate response and small enough
ripple simply requires a study of the compromises to be
made Inherently V-to-F converter response can be fast
but F-to-V response can not
TLH5680 – 6
Use stable components with low temperature coefficients
See Typical Applications section
This resistor can be 5 kX or 10 kX for VSe8V to 22V
but must be 10 kX for VSe45V to 8V
Use low offset voltage and low offset current op amps for A1
recommended types LF411A or LF356
FIGURE 4 Precision Voltage-to-Frequency Converter
100 kHz Full-Scale g003% Non-Linearity
TLH5680 – 7
VOUT e fIN c 209V c
RL
RS
c
(RtCt)
Use stable components with low temperature coefficients
FIGURE 5 Simple Frequency-to-Voltage Converter
10 kHz Full-Scale g006% Non-Linearity
VOUT ebfIN c 209V c
RF
RS
c
(RtCt)
TLH5680 – 8
SELECT Rx e
(VS b 2V)
02 mA
Use stable components with low temperature coefficients
FIGURE 6 Precision Frequency-to-Voltage Converter
10 kHz Full-Scale with 2-Pole Filter g001%
Non-Linearity Maximum
8




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