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NTE890 Datasheet(PDF) 2 Page - NTE Electronics

Part No. NTE890
Description  Integrated Circuit Voltage to Frequency Converter
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Maker  NTE [NTE Electronics]
Homepage  http://www.nteinc.com
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NTE890 Datasheet(HTML) 2 Page - NTE Electronics

   
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Electrical Characteristics (Cont’d): (V+ = +15V, TA = +25°C unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
Current Source
Output Current
RS = 14kΩ, Pin1, V+ = 0V
138.7
µA
Change with Voltage
Pin1, V+ = 0V to 10V
1.0
2.5
µA
Off Leakage
Pin1, V+ = 0V
1
50
nA
Reference Voltage
Pin2
1.70
1.90
2.08
V
Logic Output VSAT
Pin3, I = 3mA
0.15
0.50
V
VSAT
Pin3, I = 2mA
0.10
0.30
V
Off Leakage
0.1
1.0
µA
Note 2. The voltage applied to comparator input Pin6 and Pin7 should not be allowed to go below
GND by more than 300mV.
Note 3. Pin3 and Pin5 are open–collector outputs. Shorts between these pins and V+ can cause
overheating and eventual destruction.
Note 4. Reference voltage terminal Pin2 is connected to the emitter of an NPN transistor and is held
at approximately 1.9V. This terminal should be protected from accidental shorts to GND or
supply voltages. Permanent damage may occur if current in Pin2 exceeds 5mA.
Note 5. Avoid stray coupling between Pin5 and Pin7 which could cause false triggering. If false trig-
gering is experienced with the precision mode circuits, bypass Pin6 to GND with at least
0.01
µF. This is necessary for operation above 10kHz.
VCC
Pin Connection Diagram
Input Voltage
GND
Threshold
Scale Factor
1
2
3
4
Current Source
Logic Output
8
7
6
5
One–Shot R, C
14
.260 (6.6)
.390 (9.9)
Max
85
.155
(3.93)
.145 (3.68)
.300
(7.62)
.300 (7.62)
.100 (2.54)


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