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NTE994M
Integrated Circuit
Voltage Controlled Oscillator
Description:
The NTE994M is a general purpose voltage controlled oscillator in an 8–Lead DIP type package
which may be used to generate square and triangular waves, the frequency of which is a very linear
function of a control voltage. The frequency is also a function of an external resistor and capacitor.
The NTE994M is specified for operation over the 0°C to +70°C temperature range.
Features:
D Wide Supply Voltage Range: 10 to 24Volts
D Very linear modulation characteristics
D High temperature stability
D Excellent supply voltage rejection
D 10 to 1 frequency range with fixed capacitor
D Frequency programmable by means of current, voltage, resistor or capacitor
Applications:
D FM Modulation
D Signal Generation
D Function generation
D Frequency shift keying
D Tone generation
Absolute Maximum Ratings:
Power Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26V
Power Dissipation (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300mW
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
Lead Temperature Setting (Soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Note 1. The maximum junction temperature of the NTE994M is 100°C. For operating at elevated
junction temperatures, devices must be derated based on a thermal resistance of 100°C/W.

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Electrical Characteristics: (VCC = 12V, TA = +25°C unless otherwise specified)
Parameter
Conditions
Min Typ Max
Maximum Operating Frequency RO = 2k, CO = 2.7pf
Input Voltage Range Pin 5
Average Temperature Coefficient
of Operating Frequency
3/4VCC
1
200
VCC
Supply Voltage Rejection
10V to 20V
0.1 2
Input Impedance Pin 5
0.5 1
VCO Sensitivity
FM Distortion
For Pin 5, from 8V to 10V,
fO = 10kHZ
±10 Deviation
6.0
6.6 7.2
0.2 1.5
Maximum Sweep Rate
500 1
Sweep Range
10:1
Output Impedance
Pin 3
Pin 4
50
50
Square Wave Output Level
Triangle Wave Output Level
Square Wave Duty Cycle
RL1 = 10k
RL2 = 10k
5.0 5.4
2.0 2.4
40 50 60
Square Wave Rise Time
20
Square Wave Fall Time
50
Triangle Wave Linearity
+1V Segment @ 1/2VCC 0.5 1
Units
MHZ
ppm/°C
%/V
M
kHZ/V
%
MHZ
Vpp
Vpp
%
ns
ns
%
Pin Connection Diagram
GND 1
N.C. 2
Square Wave Output 3
Triangle Wave Output 4
8 VCC
7 Timing Capacitor
6 Timing Resistor
5 Modulator Input

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85
.256 (6.52) Max
14
.393 (10.0)
Max
.150
(3.81)
.300 (7.62)
.100 (2.54)
.300 (7.62)
.070 (1.77) Min