NE566 Просмотр технического описания (PDF) - Philips Electronics
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NE566 Datasheet PDF : 5 Pages
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Philips Semiconductors Linear Products
Function generator
Product specification
NE/SE566
TYPICAL PERFORMANCE CHARACTERISTICS
Normalized Frequency as a
Function of Control Voltage
2.5
V+ = 12 VOLTS
2.0
1.5
1.0
0.5
0 0.5 1.0 1.5 2.0 2.5 3.0
CONTROL VOLTAGE
(BETWEEN PIN 8 AND PIN 5) — VOLTS
Power Supply Current as a
Function of Supply Voltage
20.0
17.5 MAXIMUM
Rt = 4kΩ
15.0
TYPICAL
12.5
10.0
7.5
5
10 13 16 19 22 25
SUPPLY VOLTAGE — V
Normalized Frequency as a
Function of Resistance (R1)
100
50
V+ = 12 VOLTS
VC = 10 VOLTS
20
10
5
2
1
0.1 0.2 0.5 1 2
5 10
NORMALIZED FREQUENCY
Frequency as a Function
of Capacitance (C1)
10
V+ = 12 VOLTS
1.0
VC = 10 VOLTS
R1 = 4k
0.1
0.01
0.001
0.0001
1
10 102 103 104 105 106
FREQUENCY — Hz
Change in Frequency as a
ÇÇÇÇ Function of Temperature
+2.5
ÇÇÇÇ +2.0
ÇÇÇÇÇÇÇÇ +1.5
ÇÇÇÇÇÇÇÇ +1.0
+0.5
ÇÇÇÇÇÇÇÇ 0
ÇÇÇÇÇÇÇÇ –0.5
–1.0
ÇÇÇÇÇÇÇÇÇÇ –1.5
V+ = 12 VOLTS
VC = 10 VOLTS
TYPICAL
–2.0
–2.5
–75 –50 –25 0 +25 +50 +75 +100 +125
TEMPERATURE — (oC)
VCO Output Waveforms
6
V+ = 12 VOLTS
5
4
12
10
8
6
4
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+≤VC≤V+
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 )) * (VC)]
R1 C1 V )
and R1 should be in the range 2kΩ< R1<20kΩ.
A small capacitor (typically 0.001µF) 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 5kΩ resistor between Pin 3 and negative supply. This
increases the current sinking capability to 2mA. The third type of
April 15, 1992
401
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