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Philips Semiconductors Linear Products
Product specification
Function generator
NE/SE566
DESCRIPTION
The NE/SE566 Function Generator is a voltage-controlled oscillator of exceptional linearity with buffered square wave and triangle wave outputs. The frequency of oscillation is determined by an external resistor and capacitor and the voltage applied to the control terminal. The oscillator can be programmed over a ten-to-one frequency range by proper selection of an external resistance and modulated over a ten-to-one range by the control voltage, with exceptional linearity.
PIN CONFIGURATIONS
D, N Packages
GROUND 1 NC 2 SQUARE WAVE OUTPUT 3 TRIANGLE WAVE OUTPUT 4 TOP VIEW 8 7 6 5 V+ C1 R1 MODULATION INPUT
FEATURES
* Wide range of operating voltage (up to 24V; single or dual) * High linearity of modulation * Highly stable center frequency (200ppm/C typical) * Highly linear triangle wave output * Frequency programming by means of a resistor or capacitor,
voltage or current
APPLICATIONS
* Frequency adjustable over 10-to-1 range with same capacitor
* Tone generators * Frequency shift keying * FM modulators * Clock generators * Signal generators * Function generators
ORDERING INFORMATION
DESCRIPTION 8-Pin Plastic Small Outline (SO) Package 14-Pin Ceramic Dual In-Line Package (CERDIP) 8-Pin Plastic Dual In-Line Package (DIP) 8-Pin Plastic Dual In-Line Package (DIP) TEMPERATURE RANGE 0 to +70C 0 to +70C 0 to +70C -55C to +125C ORDER CODE NE566D NE566F NE566N SE566N DWG # 0174C 0581B 0404B 0404B
BLOCK DIAGRAM
V+ R1 6 VC CURRENT SOURCES 8 SCHMITT TRIGGER BUFFER AMPLIFIER 3
MODULATION 5 INPUT
4 BUFFER AMPLIFIER 7 C1
April 15, 1992
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853-0910 06454
Philips Semiconductors Linear Products
Product specification
Function generator
NE/SE566
EQUIVALENT SCHEMATIC
6 5
VC R1 (EXTERNAL) 8 V+
7
C1 (EXTER- NAL)
4
3
5k
1 GROUND
ABSOLUTE MAXIMUM RATINGS
SYMBOL V+ VIN, VC TSTG TA Input voltage Storage temperature range Operating ambient temperature range NE566 SE566 PD Power dissipation 0 to +70 -55 to +125 300 C C mW PARAMETER Maximum operating voltage RATING 26 3 -65 to +150 UNIT V VP-P C
April 15, 1992
399
Philips Semiconductors Linear Products
Product specification
Function generator
NE/SE566
DC ELECTRICAL CHARACTERISTICS
TA=25C, VCC=6V, unless otherwise specified. SYMBOL General TA VCC ICC VCO1 fMAX Maximum operating frequency Frequency drift with temperature Frequency drift with supply voltage Control terminal input impedance2 FM distortion (10% deviation) Maximum sweep rate Sweep range Output Triangle wave output impedance voltage linearity Square wave input impedance voltage duty Cycle tR tF Rise time Fall Time 5 45 50 5.4 50 20 50 55 5 40 50 5.4 50 20 50 60 VP-P % ns ns 1.9 50 2.4 0.2 1.9 50 2.4 0.5 VP-P % 1 500 0.1 1 0.2 1 10:1 0.75 1 1 600 0.2 1 0.4 1 10:1 1.5 2 MHz ppm/C %/V M % MHz Operating ambient temperature range Operating supply voltage Operating supply current -55 6 7 125 12 12.5 0 6 7 70 12 12.5 C V mA PARAMETER SE566 Min Typ Max Min NE566 Typ Max UNIT
NOTES: 1. The external resistance for frequency adjustment (R1) must have a value between 2k and 20k. 2. The bias voltage (VC) applied to the control terminal (Pin 5) should be in the range V+VCV+.
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Philips Semiconductors Linear Products
Product specification
Function generator
NE/SE566
TYPICAL PERFORMANCE CHARACTERISTICS
2.5 V+ = 12 VOLTS NORMALIZED FREQUENCY RESISTANCE (R ) -- (K ) 1 2.0
100 CHANGE IN FREQUENCY -- (%) 50 V+ = 12 VOLTS VC = 10 VOLTS
+2.5 +2.0 +1.5 +1.0 +0.5 0 -0.5 -1.0 -1.5 -2.0
20 10 5
1.5 1.0
0.5
2 1 0.1
0
0.5
1.0
1.5
2.0
2.5
3.0
0.2
0.5
1
2
5
10
-2.5 -75 -50 -25
CONTROL VOLTAGE (BETWEEN PIN 8 AND PIN 5) -- VOLTS
NORMALIZED FREQUENCY
F
Power Supply Current as a Function of Supply Voltage
20.0 Rt = 4k TYPICAL
Frequency as a Function of Capacitance (C1)
10 OUTPUT 3 -- V OUTPUT PIN 4 -- V V+ = 12 VOLTS VC = 10 VOLTS R1 = 4k 6 5 4
SUPPLY CURRENT -- mA
17.5 15.0 12.5 10.0 7.5 5 10
MAXIMUM
CAPACITANCE (C ) -- 1
1.0 0.1
0.01
0.001
0.0001 13 16 19 22 25 1 10 102 103 104 105 106
SUPPLY VOLTAGE -- V
FREQUENCY -- Hz
OPERATING INSTRUCTIONS
The NE/SE566 Function Generator is a general purpose voltage-controlled oscillator designed for highly linear frequency modulation. The circuit provides simultaneous square wave and triangle wave outputs at frequencies up to 1MHz. A typical connection diagram is shown in Figure 1. The control terminal (Pin 5) must be biased externally with a voltage (VC) in the range V+VCV+ where VCC is the total supply voltage. In Figure 1, the control voltage is set by the voltage divider formed with R2 and R3. The modulating signal is then AC coupled with the capacitor C2. The modulating signal can be direct coupled as well, if the appropriate DC bias voltage is applied to the control terminal. The frequency is given approximately by
fO +
2 [(V )) * (V C)] R1 C1 V )
and R1 should be in the range 2k< R1<20k. A small capacitor (typically 0.001F) should be connected between Pins 5 and 6 to eliminate possible oscillation in the control current source. If the VCO is to be used to drive standard logic circuitry, it may be desirable to use a dual supply as shown in Figure 2. In this case the square wave output has the proper DC levels for logic circuitry. RTL can be driven directly from Pin 3. For DTL or TTL gates, which require a current sink of more than 1mA, it is usually necessary to connect a 5k resistor between Pin 3 and negative supply. This increases the current sinking capability to 2mA. The third type of
April 15, 1992
401
CCCCC CCCCC C CCCCCCCC C CCCCCCCC C CCCCCCCC C CCCCCCCC CCCC CCCC
V+ = 12 VOLTS VC = 10 VOLTS TYPICAL 0 TEMPERATURE -- (oC)
Normalized Frequency as a Function of Control Voltage
Normalized Frequency as a Function of Resistance (R1)
Change in Frequency as a Function of Temperature
+25 +50 +75 +100 +125
VCO Output Waveforms
V+ = 12 VOLTS
12 10 8 6 4
Philips Semiconductors Linear Products
Product specification
Function generator
NE/SE566
interface shown uses a saturated transistor between the 566 and the logic circuitry. This scheme is used primarily for TTL circuitry which requires a fast fall time (<50ns) and a large current sinking capability.
V+ R2 1.5K .001F R1
1.5K
.001F
R1 RTL 10K
5K DTL OR T2L WITH FAST FALL TIME
C2 R3 10K
84 56 VC SE/NE 566 7 13
C1
10K
3 VC 5 SE/NE 566 4 7 1
C1 -6 VOLTS 5K
6
8
DTL & T 2L
Figure 2. Figure 1.
April 15, 1992
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