NTE890
Integrated Circuit
Voltage to Frequency Converter
Description:
The NTE890 is an integrated circuit in an 8鈥揕ead DIP type package and provides a simple method
of A/D conversion. It has all the inherent advantages of the voltage鈥搕o鈥揻requency conversion tech-
nique. The output is a series of constant duration pulses. The frequency of the pulses is proportional
to the applied input voltage. This converter is designed for use in a wide range of data conversion
and remote sensing applications.
Absolute Maximum Ratings:
(T
A
= +25擄C unless otherwise specified)
Supply Voltage, V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V to 22V
Output Sink Current, I
SINK
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Power Dissipation, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW
Input Voltage, V
i
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?.2V to V+(V)
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +75擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +125擄C
Electrical Characteristics:
(V+ = +15V, T
A
= +25擄C unless otherwise specified)
Parameter
Supply Current
Test Conditions
8V < V+ < 15V
15V < V+ < 22V
Conversion Accuracy Scale Factor
Drift with Temperature
Drift with V+
Input Comparator Offset Voltage
Offset Current
Input Bias Current
Common Mode Range
One鈥揝hot Threshold Voltage
Input Bias Current
Reset V
SAT
Note 1
Pin5
Pin5
Pin5, I = 2.2mA
V
IN
= 10V, R
S
= 14k鈩?/div>
V
IN
= 10V
V
IN
= 1V, 8V < V+ < 18V
Min
2.0
2.0
0.9
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Typ
3.5
4.5
1.0
鹵100
0.2
5
鹵50
鈥?00
Max
6.0
7.5
1.1
鈥?/div>
1.0
10
鹵100
鈥?00
鈥?/div>
0.70
鈥?00
0.50
Unit
mA
mA
kHz/V
ppM/擄C
%/V
mV
nA
nA
V
x V+
nA
V
0 to V+ 鈥? 0 to V+ 鈥?
0.63
鈥?/div>
鈥?/div>
0.66
鈥?00
0.15
Note 1 Input Common Mode Range includes GND.
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