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