NTE864 Precision Waveform Generator PDIP-14

Info as 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: (T_A = +25°C, V_S = ±5V to ±15V, R_L = 1M Ohm, R_A = R_B = 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 V_CC 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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