NTE890
Integrated Circuit
Voltage to Frequency Converter
Description:
The NTE890 is an integrated circuit in an 8–Lead DIP type package and provides a simple method
of A/D conversion. It has all the inherent advantages of the voltage–to–frequency 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: (TA = +25°C unless otherwise specified)
Supply Voltage, V+ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8V to 22V
Output Sink Current, ISINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20mA
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500mW
Input Voltage, Vi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.2V to V+(V)
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +75°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C
Electrical Characteristics: (V+ = +15V, TA = +25°C unless otherwise specified)
Parameter
Supply Current
Test Conditions
8V < V+ < 15V
15V < V+ < 22V
Min
2.0
2.0
0.9
–
Typ
3.5
Max
6.0
Unit
mA
4.5
7.5
mA
Conversion Accuracy Scale Factor
Drift with Temperature
Drift with V+
V
IN
V
IN
V
IN
= 10V, R = 14kΩ
1.0
1.1
kHz/V
ppM/°C
%/V
mV
S
= 10V
±100
0.2
–
= 1V, 8V < V+ < 18V
–
1.0
Input Comparator Offset Voltage
Offset Current
–
5
10
–
±50
–100
±100
–300
–
nA
Input Bias Current
–
nA
Common Mode Range
One–Shot Threshold Voltage
Input Bias Current
Note 1
0 to V+ –3 0 to V+ –2
V
Pin5
0.63
–
0.66
–100
0.15
0.70
–500
0.50
x V+
nA
Pin5
Reset V
Pin5, I = 2.2mA
–
V
SAT
Note 1 Input Common Mode Range includes GND.