NTE NTE864

NTE864
Integrated Circuit
Precision Waveform Generator
Description:
The NTE864 is a precision waveform generator in a 14–Lead DIP type package capable of producing
sine, square, triangular, sawtooth and pulse waveform. Its operating frequency can be selected over
eight decades of frequency, from 0.001Hz to 200kHz. The frequency of oscillation is highly stable over
a wide range of temperature and supply voltage changes. Both full frequency sweeping as well as
smaller frequency variations (FM) can be accomplished with an external control voltage. Each of the
three basic waveforms, i.e., sinewave, triangle and square wave outputs are available simultaneously,
from independent output terminals.
Applications:
D Precision Waveform Generation: Sine, Triangle, Square, Pulse
D Sweep and FM Generation
D Tone Generation
D Instrumentation and Test Equipment Design
D Precision PLL Design
Absolute Maximum Ratings:
Power Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V
Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW
Derate Above +25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mW/°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0° to +70°C
System Description:
The NTE864 precision waveform generator produces highly stable and sweepable square, triangle,
and sine waves across eight frequency decades. The device time base employs resistors and a capacitor for frequency and duty cycle determination. The generator contains dual comparators, a flip–
flop driving a switch, current sources, buffers, and a sine wave converter. Three identical frequency
waveforms are simultaneously available. Supply voltage can range from 10V to 30V, or ±5V to ±15V
with dual supplies.
Unadjusted sine wave distortion is typically less than 0.7%, with Pin1 open and 82kΩ from Pin12 to
Pin11 (–V or GND). Sine wave distortion may be improved by including two 100kΩ potentiometers
between VCC and –V (or GND), with one wiper connected to Pin1 and the other connected to Pin12.
Small frequency deviation (FM) is accomplished by applying modulation voltage to Pin7 and Pin8;
large frequency deviation (sweeping) is accomplished by applying voltage to Pin8 only. Sweep range
is typically 1000:1.
System Description (Cont’d):
The square wave output is an open collector transistor; output amplitude swing closely approaches
the supply voltage. Triangle output amplitude is typically 1/3 of the supply, and sine wave output
reaches 0.22 of the supply voltage.
Electrical Characteristics: (VS = ±5V to ±15V, TA = +25°C, RL = 1MΩ, RA = RB = 10kΩ, C1 = 3300pF,
S1 closed, unless otherwise specified.)
Parameter
Test Conditions
Min
Typ
Max
Unit
10
±5
–
–
–
12
30
±15
15
V
V
mA
200
–
–
kHz
–
0.001
–
Hz
–
100
–
kHz
–
–
–
Note 4
–
0.5
–
–
1000:
1
0.1
–
50
0.05
RL = 100kΩ
0.9
0.98
–
x VSPLY
ISINK = 2mA
RL = 4.7kΩ
RL = 4.7kΩ
–
–
–
2
0.2
100
40
–
0.4
–
–
98
V
ns
ns
%
RL = 100kΩ
0.3
0.33
–
x VSPLY
IOUT = 5mA
–
–
0.05
200
–
–
%
Ω
RL = 100kΩ
0.2
0.22
–
x VSPLY
–
–
0.7
0.5
1.5
–
%
%
General Characteristics
Supply Voltage, VS
Single Supply
Dual Supplies
Supply Current
VS = ±10V, Note 1
Frequency Characteristics (Measured at Pin9)
Range of Adjustment
Max. Operatring Frequency
Lowest Practical Frequency
Max. Sweep Frequency of
FM Input
FM Sweep Range
FM Linearity 10:1 Ratio
Range of Timing Resistors
Temperature Stability
Power Supply Stability
RA = RB = 1.5kΩ, C1 = 680pF, RL = 10kΩ
RA = RB = 1MΩ, C1 = 500µF, (Low Leakage Cap)
S1 Open, Note 2, Note 3
S1 Open, Note 3
Values of RA and RB
–
%
1000
kΩ
100 ppm/°C
–
%/V
Output Characteristics
Square Wave (Pin9)
Amplitude (Peak–to–Peak)
Saturation Voltage
Rise Time
Fall Time
Duty Cycle Adjust
Triangle/Sawtooth/Ramp (Pin3)
Amplitude (Peak–to–Peak)
Linearity
Output Impedance
Sine–Wave Distortion
Amplitude (Peak–to–Peak)
Unadjusted
Adjusted
RL = 1MΩ, Note 5, Note 6
Note 1 Currents through RA and RB not included.
Note 2 VSUPPLY = 20V
Note 3 Apply sweep voltage at Pin8. VCC – (1/3 VSUPPLY – 2) ≤ VPIN8 ≤ VCC, VSUPPLY = Total Supply
Voltage across the IC
Note 4 10V ≤ VS ≤ 30V or ±5V ≤ VS ≤ ±15V.
Note 5 82kΩ resistor connected between Pin11 and Pin12.
Note 6 Triangle duty cycle set at 50%, use RA and RB.
Note 7 As RL is decreased distortion will increase, RL min. ≅ 50kΩ.
Pin Connection Diagram
Sine Adjust 1
14 N.C.
Sine Wave 2
13 N.C.
12 Sine Adjust
Sawtooth Wave 3
Duty Cycle Adjust 4
11 GND
Duty Cycle Adjust 5
10 Timing Capacitor
(+) VCC
6
9 Square Wave
FM Bias 7
8 FM Sweep Input
14
8
1
7
.785 (19.95)
Max
.300 (7.62)
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min