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NTE989 Integrated Circuit General Purpose Phase Lock Loop (PLL)
Description: The NTE989 is a general purpose Phase Locked Loop (PLL) in a 14-Lead DIP type package containing a stable, highly linear voltage controlled oscillator for low distortion FM demodulation, and a double balanced phase detector with good carrier suppression. The VCO frequency is set with an external resistor and capacitor, and tuning range of 10:1 can be obtained with the same capacitor. The characteristics of the closed loop system-bandwidth, response speed, capture and pull in range- may be adjusted over a wide range with an external resistor and capacitor. The loop may be broken between the VCO and the phase detector for insertion of a digital frequency divider to obtain frequency multiplication. Features: D 200ppm/C frequency stability of the VCO D Power supply range of 5 to 12 volts with 100ppm/% typical D 0.2% linearity of demodulated output D Linear triangle wave with in phase zero crossings available D TTL and DTL compatible phase detector input and square wave output D Adjustable hold in range from 1% to > 60% Applications: D Data and tape synchronization D Modems D FSK demodulation D FM demodulation D Frequency synthesizer D Tone decoding
D D D D D
Frequency multiplication and division SCA demodulators Telemetry receivers Signal regeneration Coherent demodulators
Absolute Maximum Ratings: Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12V Power Dissipation (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300mW Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1V Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0C to +70C Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to +150C Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300C Note 1. The maximum junction temperature of the NTE989 is 100C. Thermal resistance for this device is 100C/W.
Electrical Characteristics: (TA = +25C, VC = 6V unless otherwise specified)
Parameter Power Supply Current Input Impedance (Pins 2,3) VCO Maximum Operating Frequency Operating Frequency Temperature Coefficient Frequency Drift with Supply Voltage Triangle Wave Output Voltage Triangle Wave Output Linearity Square Wave Output Level Output Impedance (Pin 4) Square Wave Duty Cycle Square Wave Rise Time Square Wave Fall Time Output Current Sink (Pin 4) VCO Sensitivity Demodulated Output Voltage (Pin 7) Total Harmonic Distortion Output Impedance (Pin 7) DC Level (Pin 7) Output Offset Voltage |V7 - V6| Temperature Drift of |V7 - V6| AM Rejection Phase Detector Sensitivity KD fo = 10kHZ 10% Frequency Deviation 10% Frequency Deviation -4V < V2, V3 < 0V Co = 2.7pF Conditions Min - - 250 - - 2 - 4.7 - 40 - - 0.6 6000 200 - - 4.0 - - - 0.55 Typ 8.0 5 500 -200 0.05 2.4 0.5 5.4 5 50 20 50 1 6600 300 0.2 3.5 4.5 50 500 40 .68 Max 12.5 - - 500 0.2 3 1 - - 60 - - - 7200 400 1.5 - 5.0 200 - - 0.95 Unit mA k kHz ppm/C %/V Vp-p % Vp-p k % ns ns mA HZ/V mVpp % k V mV V/C dB V/radian
Applications Information: In designing with phase locked loops the important parameters of interest are: FREE RUNNING FREQUENCY 1 fo 3.7 R0C0 LOOP GAIN: The Loop Gain relates the amount of phase change between the input signal and the VCO signal for a shift in input signal frequency (assuming the loop remains in lock). In servo theory, this is called the "velocity error coefficient". Loop gain = KoKD 1 sec radians/sec volt volts radian
Ko = oscillator sensitivity
KD = phase detector sensitivity
Applications Information (Cont'd): LOOP GAIN (Cont'd): The loop gain of the NTE989 is dependent on supply voltage, and may be found from: 33.6 fo KoKD = Vc fo = VCO frequency in HZ Vc = total supply voltage to circuit Loop gain may be reduced by connecting a resistor between Pin6 and Pin7; this reduces the load impedance on the output amplifier and hence the loop gain. HOLD IN RANGE: The Hold In Range is the range of frequencies that the loop will remain in lock after initially being locked. 8 fo fH = Vc fo = free running frequency of VCO Vc = total supply voltage to the circuit THE LOOP FILTER In almost all applications, it will be desirable to filter the signal at the output of the phase detector (Pin7). A simple lag filter may be used for wide closed loop bandwidth applications such as modulation following where the frequency deviation of the carrier is fairly high (greater than 10%), or where wideband modulating signals must be followed. For narrow band applications where a narrow noise bandwidth is desired, such as applications involving tracking a slowly varying carrier, a lead lag filter should be used. In general the damping factor for the loop becomes quite small resulting in large overshoot and possible instability in the transient response of the loop.
Pin Connection Diagram
(-) VCC 1 Input Input VCO Output Phase Comparator VCO Input Reference Output VCO Control Voltage 2 3 4 5 6 7
14 N.C. 13 N.C. 12 N.C. 11 N.C.
10 (+) VCC 9 8 Timing Capacitor Timing Resistor
14
8
1
7
.785 (19.95) Max .200 (5.08) Max
.300 (7.62)
.100 (2.45) .600 (15.24)
.099 (2.5) Min

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