NTE864
Integrated Circuit
Precision Waveform Generator
Description:
The NTE864 is a precision waveform generator in a 14鈥揕ead 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, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36V
Power Dissipation, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW
Derate Above +25擄C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mW/擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0擄 to +70擄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 ca-
pacitor for frequency and duty cycle determination. The generator contains dual comparators, a flip鈥?/div>
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
鹵5V
to
鹵15V
with dual supplies.
Unadjusted sine wave distortion is typically less than 0.7%, with Pin1 open and 82k鈩?from Pin12 to
Pin11 (鈥揤 or GND). Sine wave distortion may be improved by including two 100k鈩?potentiometers
between V
CC
and 鈥揤 (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.
1
2
3
