NTE890 Просмотр технического описания (PDF) - NTE Electronics

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NTE890

Integrated Circuit Voltage to Frequency Converter

NTE Electronics 

Electrical Characteristics (Cont’d): (V+ = +15V, TA = +25°C unless otherwise specified)

Parameter

Test Conditions

Min

Typ

Max

Unit

Current Source

Output Current

Change with Voltage

RS = 14kΩ, Pin1, V+ = 0V

Pin1, V+ = 0V to 10V

–

138.7

–

µA

–

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

VSAT

Off Leakage

Pin3, I = 3mA

Pin3, I = 2mA

–

0.15

0.50

V

–

0.10

0.30

V

–

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

0.01µF. This is necessary for operation above 10kHz.

Pin Connection Diagram

Current Source 1

Scale Factor 2

Logic Output 3

GND 4

8 VCC

7 Input Voltage

6 Threshold

5 One–Shot R, C

8

5

.260 (6.6)

1

4

.390 (9.9)

Max

.155

(3.93)

.300

(7.62)

.100 (2.54)

.145 (3.68)

.300 (7.62)

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