http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




National Semiconductor Electronic Components Datasheet

LM231WM Datasheet

Precision Voltage-to-Frequency Converters

No Preview Available !

LM231WM pdf
December 1994
LM131A LM131 LM231A LM231 LM331A LM331
Precision Voltage-to-Frequency Converters
General Description
The LM131 LM231 LM331 family of voltage-to-frequency
converters are ideally suited for use in simple low-cost cir-
cuits for analog-to-digital conversion precision frequency-
to-voltage conversion long-term integration linear frequen-
cy modulation or demodulation and many other functions
The output when used as a voltage-to-frequency converter
is a pulse train at a frequency precisely proportional to the
applied input voltage Thus it provides all the inherent ad-
vantages of the voltage-to-frequency conversion tech-
niques and is easy to apply in all standard voltage-to-fre-
quency converter applications Further the LM131A
LM231A LM331A attains a new high level of accuracy ver-
sus temperature which could only be attained with expen-
sive voltage-to-frequency modules Additionally the LM131
is ideally suited for use in digital systems at low power sup-
ply voltages and can provide low-cost analog-to-digital con-
version in microprocessor-controlled systems And the fre-
quency from a battery powered voltage-to-frequency con-
verter can be easily channeled through a simple photoisola-
tor to provide isolation against high common mode levels
The LM131 LM231 LM331 utilizes a new temperature-
compensated band-gap reference circuit to provide excel-
lent accuracy over the full operating temperature range at
power supplies as low as 4 0V The precision timer circuit
Typical Applications
has low bias currents without degrading the quick response
necessary for 100 kHz voltage-to-frequency conversion
And the output is capable of driving 3 TTL loads or a high
voltage output up to 40V yet is short-circuit-proof against
VCC
Features
Y Guaranteed linearity 0 01% max
Y Improved performance in existing voltage-to-frequency
conversion applications
Y Split or single supply operation
Y Operates on single 5V supply
Y Pulse output compatible with all logic forms
Y Excellent temperature stability g50 ppm C max
Y Low power dissipation 15 mW typical at 5V
Y Wide dynamic range 100 dB min at 10 kHz full scale
frequency
Y Wide range of full scale frequency 1 Hz to 100 kHz
Y Low cost
fOUT
e
VIN
2 09 V

RS
RL

1
RtCt
TL H 5680 – 1
Use stable components with low temperature coefficients See Typical Applications section
0 1mF or 1mF See ‘‘Principles of Operation ’’
FIGURE 1 Simple Stand-Alone Voltage-to-Frequency Converter
with g0 03% Typical Linearity (f e 10 Hz to 11 kHz)
C1995 National Semiconductor Corporation TL H 5680
RRD-B30M115 Printed in U S A


National Semiconductor Electronic Components Datasheet

LM231WM Datasheet

Precision Voltage-to-Frequency Converters

No Preview Available !

LM231WM pdf
Absolute Maximum Ratings (Note 1)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office
Distributors for availability and specifications
Supply Voltage
Output Short Circuit to Ground
Output Short Circuit to VCC
Input Voltage
Operating Ambient Temperature Range
Power Dissipation (PD at 25 C)
and Thermal Resistance (ijA)
(H Package) PD
ijA
(N Package) PD
ijA
(M Package) PD
iJA
Lead Temperature (Soldering 10 sec )
Dual-In-Line Package (Plastic)
Metal Can Package (TO-5)
ESD Susceptibility (Note 4)
Metal Can Package (TO-5)
Other Packages
LM131A LM131
40V
Continuous
Continuous
b0 2V to aVS
TMIN TMAX
b55 C to a125 C
670 mW
150 C W
260 C
260 C
2000V
LM231A LM231
40V
Continuous
Continuous
b0 2V to aVS
TMIN TMAX
b25 C to a85 C
1 25W
100 C W
1 25W
85 C W
260 C
500V
LM331A LM331
40V
Continuous
Continuous
b0 2V to aVS
TMIN TMAX
0 C to a70 C
1 25W
100 C W
260 C
500V
Electrical Characteristics TAe25 C unless otherwise specified (Note 2)
Parameter
Conditions
Min
VFC Non-Linearity (Note 3)
4 5V s VS s 20V
TMIN s TA s TMAX
VFC Non-Linearity
In Circuit of Figure 1
Conversion Accuracy Scale Factor (Gain)
LM131 LM131A LM231 LM231A
LM331 LM331A
Temperature Stability of Gain
LM131 LM231 LM331
LM131A LM231A LM331A
Change of Gain with VS
Rated Full-Scale Frequency
Gain Stability vs Time
(1000 Hrs)
Overrange (Beyond Full-Scale) Frequency
INPUT COMPARATOR
Offset Voltage
LM131 LM231 LM331
LM131A LM231A LM331A
Bias Current
Offset Current
Common-Mode Range
VS e 15V f e 10 Hz to 11 kHz
VIN e b10V RS e 14 kX
TMIN s TA s TMAX 4 5V s VS s 20V
4 5VsVS s 10V
10V s VS s 40V
VIN e b10V
TMIN s TA s TMAX
VIN e b11V
TMIN s TA s TMAX
TMIN s TA s TMAX
TMIN s TA s TMAX
0 95
0 90
10 0
10
b0 2
Typ
g0 003
g0 006
g0 024
1 00
1 00
g30
g20
0 01
0 006
g0 02
g3
g4
g3
b80
g8
Max
g0 01
g0 02
g0 14
1 05
1 10
g150
g50
01
0 06
g10
g14
g10
b300
g100
VCCb2 0
Units
% Full-
Scale
% Full-
Scale
%Full-
Scale
kHz V
kHz V
ppm C
ppm C
%V
%V
kHz
% Full-
Scale
%
mV
mV
mV
nA
nA
V
2


Part Number LM231WM
Description Precision Voltage-to-Frequency Converters
Maker National Semiconductor
Total Page 16 Pages
PDF Download
LM231WM pdf
Download PDF File
LM231WM pdf
View for Mobile






Related Datasheet

1 LM231WM Precision Voltage-to-Frequency Converters National Semiconductor
National Semiconductor
LM231WM pdf




Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components