NTE864 Precision Waveform Generator PDIP-14
Info als pdf File
Description:
The NTE864 is a precision waveform generator in a 14-Lead DIP type package capable of producing sine, square, triangle, sawtooth, and pulse waveforms. 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:
- Precision Waveform Generaztion: Sine, Triangle, Square, Pulse
- Sweep and FM Generation
- Tone Generation
- Instrumentation and Test Equipment Design
- 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 |
Electrical Characteristics: (TA = +25°C, VS = ±5V to ±15V, RL = 1M Ohm, RA = RB = 10k Ohm, C1 = 3300pF, S1 Closed unless otherwise specified)
| Parameter |
Test Conditions |
Min |
Typ |
Max |
Unit |
| Supply Voltage |
Single Supply |
|
10 |
- |
30 |
V |
| Dual Supplies |
±5 |
- |
±15 |
V |
| Supply Current |
VS = ±10V, Note 1 |
- |
12 |
15 |
mA |
| Frequency Characteristics (Measured at Pin9) |
| Range of Adjustment |
Max. Operating Frequency |
RA = RB = 1.5k Ohm, C1 = 680pF, RL = 10k Ohm |
200 |
- |
- |
kHz |
| Lowest Practical Frequency |
RA = RB = 1M Ohm, C1 = 500µF, (Low Leakage Cap) |
- |
0.001 |
- |
Hz |
| Max. Sweep Frequency of |
FM Input |
|
- |
100 |
- |
kHz |
| FM Sweep Range |
S1 Open, Note 2, Note 3 |
- |
1000:1 |
- |
|
| FM Linearity 10:1 Ratio |
S1 Open, Note 3 |
- |
0.1 |
- |
% |
| Range of Timing Resistors |
Values of RA and RB |
0.5 |
- |
1000 |
k Ohm |
| Temperature Stability |
|
- |
50 |
100 |
ppm / °C |
| Power Supply Stability |
Note 4 |
- |
0.05 |
- |
% / V |
| Output Characteristics |
| Square Wave (Pin9) |
Amplitude (Peak-to-Peak) |
RL = 100k Ohm |
0.90 |
0.98 |
- |
x VSPLY |
| Saturation Voltage |
ISINK = 2mA |
- |
0.2 |
0.4 |
V |
| Rise Time |
RL = 4.7k Ohm |
- |
100 |
- |
ns |
| Fall Time |
RL = 4.7k Ohm |
- |
40 |
- |
ns |
| Duty Cycle Adjust |
|
2 |
- |
98 |
% |
| Triangle / Sawtooth / Ramp (Pin3) |
Amplitude (Peak-to-Peak) |
RL = 100k Ohm |
0.30 |
0.33 |
- |
x VSPLY |
| Linearity |
|
- |
0.05 |
- |
% |
| Output Impedance |
IOUT = 5mA |
- |
200 |
- |
Ohm |
| Sine-Wave Distortion |
Amplitude (Peak-to-Peak) |
RL = 100k Ohm |
0.20 |
0.22 |
- |
x VSPLY |
| Unadjusted |
RL = 1M Ohm, Note 5, Note 6 |
- |
0.7 |
1.5 |
% |
| Adjusted |
- |
0.5 |
- |
% |
| 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. | 82k Ohm 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 is equivalent to 50k Ohm. |
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 swith, 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 82k Ohm from Pin12 to Pin11 (=V or GND). Sine wave distortion may be improved by including two 100k Ohm potentiometers between VCC and -V (or GND), with one wiper connecrted 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.
The square wave output is an open collector transistor; output amplitude swing closely approaches the supply voltage. Triange output amplitude is typically 1/3 of the supply, and sine wave output reaches 0.22 of the supply voltage.
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